CN109086286A - A kind of production of Pictorial Map and dissemination method - Google Patents
A kind of production of Pictorial Map and dissemination method Download PDFInfo
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Abstract
The invention discloses a kind of production of Pictorial Map and dissemination methods, it is integrated and is supported based on related geographical information technology, design proposes the sub-processes such as geographical space Internet resources storage management, digital elevation data processing, the rendering of batch geographical spatial data, the publication of standard geography spatial network resource service, standard geography spatial network caching resource, pass through relevant treatment process, it realizes that the classification piecemeal of topographic map data quickly produces, and the publication of online topographic map and access method of a kind of standard is provided.Present invention is mainly used for integrate geographical spatial data Service Source, in conjunction with data characteristics such as digital orthoimage, digital elevation, map vectors, Correlation method for data processing process is designed, clear and accurate topographic map data and service are generated, improves terrain data production and access efficiency.
Description
Technical field
The invention belongs to technical field of geographic information, a kind of Pictorial Map production and dissemination method are related generally to.
Background technique
In the today's society of Internet industry and informationization technology high speed development, the development of geographical information technology related industry
Very rapidly, wherein disparate networks Map Services are increasingly becoming an important branch of geographical information technology and big data platform technology
Support.Map Service of Network based on Internet resources is the important component of common base geographical information platform, the base of carrying
Plinth geography information is rich and varied, more intuitively recognizes geographical space convenient for people.Topographic map data is as geography information network
Important component in Map Services is that vectorial geographical spatial data, grid geographical spatial data, digital elevation etc. is organic
In conjunction with a kind of multidimensional GIS Web service for issuing out later, it is contour can either intuitively to pass through color, massif shade
Journey data model understands the topography profile situation in a certain region, while can also clearly be marked according to the element of map vector
Situation accurately analyzes measurement to the geographical spatial data information in the region.With arriving for geomatics industry big data era
Come, the topographic map data for collecting multiclass physical features and Social elements and service are in urban planning, Disaster Assessment, national defense construction etc.
The effect of various aspects is increasingly apparent.Since topographic map data is more demanding to all kinds of geographical space element integrated levels, early stage landform
The drafting of figure and production are very difficult, with the continuous development of remote sensing technology and perfect, the remote sensing of computer graphics software function
Provide the source of data for the production of topographic map, GIS-Geographic Information System as based on computer graphics Spatial information collection,
The integrated technology system of analysis and processing provides the means for obtaining information and direct, quick mapping method, remote sensing number
The production of topographic map and manufacturing technology is set to have stepped major step forward according to the combination with GIS-Geographic Information System.However it is current no matter on ground
Shape diagram data source, map accuracy, the quality of data, efficiency of service etc. still suffer from many problems: being based on geography information
The network topography figure service of transmission and expression of space entity purpose, space time language different in different industries different field form
Adopted serious loss, expression object is imperfect, and scale bar inaccuracy, carrying document form is varied, production system bulky complex
The problems such as become increasingly conspicuous, while high-precision network topography figure Serve the production and remote sensing technology, digital image processing techniques, big number
It is in close relations according to parallel processing technique, it is also desirable to different industries such as survey and draw, urban construction, space flight support and cooperation, therefore early stage
Single topographic map data production method is no longer satisfied existing integration requirement, proposes a kind of convenient and fast landform of efficiently and accurately
Figure service mode becomes particularly significant.According to the above problem, comprehensive existing geography information the relevant technologies and network geographical are believed in text
Cease resource, design it is a kind of based on process network topography figure production and service publishing process, concern realize multi-source geographic information
Collecting with visualization simultaneously for resource, improves data production efficiency and flexibility, and bound fraction network technology reinforces resource-sharing
With push ability, and the application verification in relevant item.
Summary of the invention
It is quickly produced the technical problem to be solved by the present invention is to a kind of topographic map of standard and method for organizing, completes face
To the production of the Pictorial Map of geographical space Internet resources and quickly access, remote sensing image, digital elevation, map vector etc. are realized
The comprehensive utilization of variety classes geographical spatial data.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of production of Pictorial Map and dissemination method, specifically include the following steps:
A geographical spatial data storage management；
The processing of B geographical space altitude data；
The rendering of C batch geographical spatial data；
The publication of D standard geography spatial network resource service；
E standard geography spatial network resource service caching.
As a kind of further preferred scheme of Pictorial Map production and dissemination method of the present invention, A geographical spatial data
Specific step is as follows for storage management:
Step A1, geographical spatial data import:
Step A11, by from the geographical space vector data and raster data obtained in network into geospatial database,
According to the different definition data projection information of data source when importing；
Step A12 carries out projection transform importing, is uniformly converted to WGS84 coordinate for the data of different coordinates
Subsequent processing is convenient in system；
Step A2 corrects the data out of date or wrong in database；
Step A21 according to the attribute information of the structuring of geographical spatial data, and utilizes the sky to Geometry object
Between inquiry operation choose and need to meet the data item of a certain condition；
Step A22 executes data and updates operation, the attribute information of the data item inquired is arranged or indicates the ground of the data
The Geometry object of reason spatial position is corrected；
Step A3 supplements the data information lacked by way of insertion；
Step A31 reads the data information on Reef in Chinese South Sea island, such as title, landform from other data sources got
The geospatial location information that type and WKT format indicate；
Step A32 executes database insert operation, and the data item batch of Reef in Chinese South Sea is inserted into database；
Step A33 during insertion carries out its geospatial location Information encapsulation at Geometry object when necessary
Coordinate system conversion；
Step A4, the ten thousand national languages Chinesizing for carrying out complicated and simple conversion and global place name to the place name of the data of Taiwan are realized；
Step A41 is operated the name attribute for obtaining the data item within the scope of Taiwan by space querying, is exported as
Csv file；
Step A42 establishes the geographical name data dictionary of complicated and simple conversion according to derived csv file, and as new number
It is imported into database according to table；
Step A43, by fuzzy query by the information of place names of the data item in step step A41 according to the ground concrete number of importing
It is replaced according to dictionary, and increases a field for storing original information of place names in former tables of data；
As a kind of further preferred scheme of Pictorial Map production and dissemination method of the present invention, B geographical space is high
Specific step is as follows for journey data processing:
Step B1 carries out the splicing of altitude data；
Step B11, will be in the path write-in splicing listed files for the altitude data file that divided according to longitude and latitude；
Step B12 specifies the minimax resolution ratio of concatenation processing, the resolution ratio in the direction x, y, maximum, minimum xy
Range, listed files to be spliced and target raster file title and path specify the nodata value in splicing etc. a series of
Splicing parameter；
Step B13 executes concatenation, generates dummy grid data or the data of other data types that can be supported；
Step B2 carries out resampling to image:
Step B21, the corresponding relationship of the level of zoom and resolution ratio that service according to the map determine under different magnification levels
The value of the resolution ratio of the altitude data needed；
Step B22, the formula can also be expressed with latitude scope and latitudinal parameter value, and calculated result is consistent；
Step B23, the resolution ratio and resampling mode of the specified target altitude data file for needing to generate, resampling mode
It can choose closest sampling or bilinear interpolation sampling etc.；
Step B24 carries out resampling to altitude data, obtains the altitude data of given resolution；
Step B3 is realized and is cut to altitude data:
Step B31 opens vector file by visualization tool, and selection needs the region retained, saves as new figure layer；
Or the region for needing to retain is drawn by drawing tool, and save as figure layer；
Step B32, multiple discontinuous regions, can save as multiple figure layers respectively if it exists, then carry out figure layer merging,
And the figure layer after merging is exported as .shp file；
Step B33 is cut using grid handling implement, and input raster data are data to be cut, output area
For the VectorLayer for cutting, the value of empty data is set in cutting parameter；
The figure layer obtained after reduction is exported as raster data file by step B34.
Step B4 generates the grating image of Pictorial Map:
Step B41 checks the essential information of altitude data, calculates the height value range of the data and obtains empty data value
Etc. information；
Step B42 determines the scheme of colour of Pictorial Map according to the display effect of the range of height value and needs, raw
At color profile；
Step B43 generates colored landform raster data image according to specified color profile；
Step B5 generates massif echo:
Step B51, the vertical exaggeration coefficient in given process and unit, light azimuth, light are high according to demand
Spend angle, etc. series of parameters value；
Step B52 calculates massif shading value, calculation formula are as follows: Hillshade=255 × ((cos (Zneith) × cos
(Slope)+(sin (Zneith) × sin (Slope) × cos (Azimuth-Aspect))), wherein Zneith is sun apex angle,
Azimuth is solar elevation, and Slope is the gradient, and Aspect is slope aspect.Institute is angled using radian as unit of account；
Step B53, the calculation formula of the gradient are as follows: Slope=arctan ((h2-h1)/(x2-x1)), wherein h2-h1Represent two
The depth displacement of consecutive points, x2-x1Represent the horizontal distance between two consecutive points；
Step B54 generates massif shade raster data image according to calculated result；
Step B6 generates gradient echo:
Step B61 establishes gradient grating image according to altitude data, and specifies vertical unit in establishment process；
Step B62 establishes the color profile of gradient shadow image；
Step B63, the gradient shade grid according to the gradient grating image and color profile of generation, after generating rendering
Image.
Step B7 generates contour line data:
Step B71 determines contour interval according to the display effect of scaling level and needs；
Step B72 specifies the band number for generating contour, for saving field name, the contour interval of height value
The parameters such as information, the contour vector file type of output, figure layer title；
Step B73 generates contour vector data file.
As a kind of further preferred scheme of Pictorial Map production and dissemination method of the present invention, C batch geographical space
Specific step is as follows for data render:
Step C1 configures the spatial frame of reference of Mapnik rendering data.
Step C2 configures the render style of vector data and raster data, specifies the application level and point, line, surface of style
The genre parameters setting of equal marks.
Step C3, the style name and data source of configuration vector data figure layer reference.
Step C4 adjusts the positional relationship of vector data figure layer and raster data figure layer, is combined into figure layer group.
Step C5 executes render process.
As a kind of further preferred scheme of Pictorial Map production and dissemination method of the present invention, D standard geographical space
It is as follows that net source service issues specific implementation step:
Step D1 prepares geographical spatial data and Mapnik render style file；
Step D2, starts WMS server, and bottom calls Mapnik rendering engine, publication WMS service；
Step D3 monitors the WMS request from client, and corresponding Map Service of Network data is returned to client
End.
As a kind of further preferred scheme of Pictorial Map production and dissemination method of the present invention, E standard geographical space
Specific step is as follows for net source service caching:
Step E1 configures the cache path of WMS cache server.
Step E2 configures the WMS figure layer parameter of WMS cache server, such as coordinate system, range, tile format and request WMS
Figure layer group name and WMS service request address；
Step E3 starts WMS cache server, carries out pre-cache to the WMS figure layer of cache server configuration；
Step E4 is arranged to WMS server according to pre-cache and initiates WMS request, the Map Service of Network that cache request arrives
Data are to cache server；
Step E5 monitors the WMS request from client, the Map Service of Network data of caching is returned to client.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1) it is produced and service published method, realization multi-source geographic information resources integration by the network topography figure based on process
With visualization；
2) synthesis of a variety of different types of geographical spatial data figures such as remote sensing image, digital elevation, map vector is realized
It utilizes；
3) compared with prior art, have data acquisition convenient, applicable scene is extensive, and creation data is high-efficient, pattern is clever
The advantages such as living；
4) entire data production process can realize there is good professional platform independence energy in different platform.5) for height
Under concurrent scene using performance with higher, be capable of providing good user experience.
Detailed description of the invention
Fig. 1 is Pictorial Map production and dissemination method structure chart based on geographical space Internet resources；
Fig. 2 is Pictorial Map production and publication implementation flow chart based on geographical space Internet resources；
Fig. 3 (a) is the overall effect figure of Pictorial Map production and publication based on geographical space Internet resources；
When Fig. 3 (b) is that the Pictorial Map based on geographical space Internet resources produces and the resolution ratio of publication is 1200 meters
Partial result；
Fig. 3 (c) is when the Pictorial Map based on geographical space Internet resources produces and the resolution ratio of publication is 160 meters
Partial result；
Fig. 3 (d) is when the Pictorial Map based on geographical space Internet resources produces and the resolution ratio of publication is 80 meters
Partial result；
It in resolution ratio is 1200 meters that Fig. 4 (a), which is Pictorial Map based on geographical space Internet resources and Google's topographic map,
When Contrast on effect；
Fig. 4 (b) is Pictorial Map based on geographical space Internet resources and Google's topographic map when resolution ratio is 600 meters
Contrast on effect；
Fig. 4 (c) is Pictorial Map based on geographical space Internet resources and Google's topographic map when resolution ratio is 160 meters
Contrast on effect；
Fig. 4 (d) is Pictorial Map based on geographical space Internet resources and Google's topographic map when resolution ratio is 80 meters
Contrast on effect
Fig. 4 (e) is Pictorial Map based on geographical space Internet resources and Google's topographic map when resolution ratio is 40 meters
Contrast on effect.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The present invention is by integrating geographical spatial data memory technology, altitude data processing technique, batch geographical spatial data
The geographical space net source service publication of Rendering, standard with caching technology etc., realize complete set based on ground
Pictorial Map production and the distribution scheme of spatial network resource are managed, as shown in Figure 1.2 pairs of tools of the invention with reference to the accompanying drawing
Body embodiment is described in detail.
Geographical spatial data storage management sub-process implementation steps are as follows:
Geographical spatial data imports
By from the geographical space vector data and raster data obtained in network into geospatial database, root when importing
According to the different definition data projection information of data source.
For the data of different coordinates, projection transform is carried out importing, WGS84 coordinate system is uniformly converted to, after being convenient for
Continuous processing.
To the data out of date or wrong in database, corrected.
According to the attribute information (such as administrative grade information) of the structuring of geographical spatial data, and using to Geometry
The data item for needing to meet a certain condition is chosen in the space querying operation of object.
It executes data and updates operation, the attribute information (such as title) or with indicating the data of the data item inquired is set
The Geometry object of reason spatial position is corrected.
The data information lacked is supplemented by way of insertion.It is situated between in detail by taking the insertion of Reef in Chinese South Sea data as an example below
It continues.
The data information on Reef in Chinese South Sea island, such as title, terrain type and WKT are read from other data sources got
The geospatial location information that format indicates.
Database insert operation is executed, the data item batch of Reef in Chinese South Sea is inserted into database.
During insertion by its geospatial location Information encapsulation at Geometry object, coordinate system is carried out when necessary and is turned
It changes.
The ten thousand national languages Chinesizing for carrying out complicated and simple conversion and global place name to the place name of the data of Taiwan is realized (with desert name
Referred to as example).The detailed process of the step is described below.
The name attribute for obtaining the data item within the scope of Taiwan is operated by space querying, is exported as csv file.
The geographical name data dictionary of complicated and simple conversion is established according to derived csv file, and is imported as new tables of data
Into database.
The information of place names of the data item in step 1) is replaced according to the geographical name data dictionary of importing by fuzzy query
It changes, and increases a field for storing original information of place names in former tables of data.
The Chinesizing process of ten thousand national language place names is similar with above-mentioned steps.
It is as follows that geographical space altitude data handles sub-process implementation steps:
Carry out the splicing of altitude data.
It will be in the path write-in splicing listed files for the altitude data file that divided according to longitude and latitude.
The minimax resolution ratio of specified concatenation processing, the resolution ratio in the direction x, y, maximum, minimum xy range, wait spell
Listed files and target raster file title and path are connect, a series of splicing ginseng such as nodata value in splicing is specified
Number.
Concatenation is executed, dummy grid data or the data of other data types that can be supported are generated.
Resampling is carried out to image
The corresponding relationship of the level of zoom and resolution ratio that service according to the map determines the height needed under different magnification levels
The value of the resolution ratio of number of passes evidence.
The calculation formula of resolution ratio is as follows: res=(Lonmax-Lonmin)/(CountTile×CountPixel), wherein
LonmaxAnd LonminRespectively represent the maximum value and minimum value of longitude range, CountTileRepresent the longitudinal of the amplification level
On tile sum, CountPixelThe sum of all pixels laterally or longitudinally for representing single map tile, generally can be according to be released
Map Services setting selection 256,512 or other values.
The formula can also be expressed with latitude scope and latitudinal parameter value, and calculated result is consistent.
The resolution ratio and resampling mode of the specified target altitude data file for needing to generate, resampling mode can choose
Closest sampling or bilinear interpolation sampling etc..
Resampling is carried out to altitude data, obtains the altitude data of given resolution.
It realizes and altitude data is cut.
Vector file is opened by visualization tool, selection needs the region retained, saves as new figure layer；Or by drawing
Figure tool draws the region for needing to retain, and saves as figure layer.
Multiple discontinuous regions if it exists can save as multiple figure layers respectively, then carry out figure layer merging, and will merge
Figure layer output afterwards is .shp file.
It is cut using grid handling implement, input raster data are data to be cut, and output area is for cutting out
The VectorLayer cut.The value of empty data is set in cutting parameter.
The figure layer obtained after reduction is exported as into raster data file.
Generate the grating image of Pictorial Map
The essential information for checking altitude data calculates the height value range of the data and obtains the information such as empty data value.
According to the display effect of the range of height value and needs, the scheme of colour of Pictorial Map is determined, generate color and match
Set file (comprising rgb value and transparency parameter alpha).
According to specified color profile, colored landform raster data image is generated.
Generate massif echo
According to demand the vertical exaggeration coefficient in given process and unit, light azimuth, ray height angle, etc. one
Parameters in series value.
Calculate massif shading value, calculation formula are as follows: Hillshade=255 × ((cos (Zneith) × cos (Slope)+
(sin (Zneith) × sin (Slope) × cos (Azimuth-Aspect))), wherein Zneith is sun apex angle, Azimuth
For solar elevation, Slope is the gradient, and Aspect is slope aspect.Institute is angled using radian as unit of account.
The calculation formula of the gradient are as follows: Slope=arctan ((h2-h1)/(x2-x1)), wherein h2-h1Represent two consecutive points
Depth displacement, x2-x1Represent the horizontal distance between two consecutive points.
Massif shade raster data image is generated according to calculated result.
Generate gradient echo
Gradient grating image is established according to altitude data, and specifies vertical unit in establishment process.
Gradient calculation formula is as shown above.
Establish the color profile of gradient shadow image.
Gradient shade grating image according to the gradient grating image and color profile of generation, after generating rendering.
Generate contour line data
According to the display effect of scaling level and needs, contour interval is determined；
The band number for generating contour is specified, for saving the field name, contour interval information, output of height value
Contour vector file type, the parameters such as figure layer title.
Generate contour vector data file.
It is as follows that batch geographical spatial data renders sub-process implementation steps:
Configure the spatial frame of reference of Mapnik rendering data.
The render style of vector data and raster data is configured, the marks such as application level and the point, line, surface of style are specified
Genre parameters setting.
Configure the style name and data source of the reference of vector data figure layer.
The positional relationship for adjusting vector data figure layer and raster data figure layer, is combined into figure layer group.
Execute render process.
It is as follows that standard geography spatial network resource service issues sub-process specific implementation step:
Prepare geographical spatial data and Mapnik render style file.
Start WMS server, bottom calls Mapnik rendering engine, publication WMS service.
The WMS request from client is monitored, and corresponding Map Service of Network data are returned into client.
It is as follows that standard geography spatial network resource service caches sub-process implementation steps:
Configure the cache path of WMS cache server.
The WMS figure layer parameter for configuring WMS cache server, such as coordinate system, range, tile format and request WMS figure layer group
Title and WMS service request address.
Start WMS cache server, pre-cache is carried out to the WMS figure layer of cache server configuration.
It is arranged according to pre-cache to WMS server and initiates WMS request, the Map Service of Network data that cache request arrives is to slow
Deposit server.
The WMS request from client is monitored, the Map Service of Network data of caching are returned into client.
Pictorial Map preview effect after publication is as shown in Figure 3.Fig. 3 (a) is the coloured silk based on geographical space Internet resources
The overall effect figure of color topographic map production and publication；Fig. 3 (b) be based on geographical space Internet resources Pictorial Map production with
The partial result when resolution ratio of publication is 1200 meters；Fig. 3 (c) is the Pictorial Map production based on geographical space Internet resources
Partial result when resolution ratio with publication is 160 meters；Fig. 3 (d) is that the Pictorial Map based on geographical space Internet resources is raw
The partial result when resolution ratio for producing and issuing is 80 meters.
As shown in figure 4, being directed to same area, pass through the Pictorial Map for issuing Google's topographic map (left side) and the present invention
(right side) compares, and Pictorial Map has geographic element richer, and atural object comparison becomes apparent from, and visualization is apparent to wait spies
Point.Wherein, it in resolution ratio is 1200 meters that Fig. 4 (a), which is Pictorial Map based on geographical space Internet resources and Google's topographic map,
When Contrast on effect；Fig. 4 (b) is that the Pictorial Map based on geographical space Internet resources is in resolution ratio with Google's topographic map
Contrast on effect at 600 meters；Fig. 4 (c) is that the Pictorial Map and Google's topographic map based on geographical space Internet resources are being differentiated
Contrast on effect when rate is 160 meters；Fig. 4 (d) is that the Pictorial Map and Google's topographic map based on geographical space Internet resources exist
Effect contrast figure when resolution ratio is 80 meters；4 (e) be Pictorial Map and Google's topographic map based on geographical space Internet resources
Contrast on effect when resolution ratio is 40 meters.
Claims (6)
1. a kind of Pictorial Map production and dissemination method, it is characterised in that: specifically include the following steps:
A geographical spatial data storage management；
The processing of B geographical space altitude data；
The rendering of C batch geographical spatial data；
The publication of D standard geography spatial network resource service；
E standard geography spatial network resource service caching.
2. a kind of Pictorial Map production according to claim 1 and dissemination method, it is characterised in that: A geographical space number
According to storage management, specific step is as follows:
Step A1, geographical spatial data import:
Step A11, into geospatial database, will be imported from the geographical space vector data and raster data obtained in network
When according to the different definition data projection information of data source；
Step A12 carries out projection transform importing, is uniformly converted to WGS84 coordinate system, just for the data of different coordinates
In subsequent processing；
Step A2 corrects the data out of date or wrong in database；
Step A21 according to the attribute information of the structuring of geographical spatial data, and is utilized and is looked into the space of Geometry object
It askes operation and chooses the data item for needing to meet a certain condition；
Step A22 executes data and updates operation, and the attribute information of the data item inquired is arranged or indicates that the geography of the data is empty
Between the Geometry object of position corrected；
Step A3 supplements the data information lacked by way of insertion；
Step A31 reads the data information on Reef in Chinese South Sea island, such as title, terrain type from other data sources got
The geospatial location information indicated with WKT format；
Step A32 executes database insert operation, and the data item batch of Reef in Chinese South Sea is inserted into database；
Its geospatial location Information encapsulation is carried out coordinate at Geometry object during insertion by step A33 when necessary
System's conversion；
Step A4, the ten thousand national languages Chinesizing for carrying out complicated and simple conversion and global place name to the place name of the data of Taiwan are realized；
Step A41 operates the name attribute for obtaining the data item within the scope of Taiwan by space querying, is exported as csv text
Part；
Step A42 establishes the geographical name data dictionary of complicated and simple conversion according to derived csv file, and as new tables of data
It imported into database；
Step A43, by fuzzy query by the information of place names of the data item in step step A41 according to the geographical name data word of importing
Allusion quotation is replaced, and increases a field for storing original information of place names in former tables of data.
3. a kind of Pictorial Map production according to claim 1 and dissemination method, it is characterised in that: B geographical space is high
Specific step is as follows for journey data processing:
Step B1 carries out the splicing of altitude data；
Step B11, will be in the path write-in splicing listed files for the altitude data file that divided according to longitude and latitude；
Step B12, the minimax resolution ratio for specifying concatenation to handle, the resolution ratio in the direction x, y, maximum, minimum xy range,
The a series of splicings such as the nodata value in splicing are specified in listed files to be spliced and target raster file title and path
Parameter；
Step B13 executes concatenation, generates dummy grid data or the data of other data types that can be supported；
Step B2 carries out resampling to image:
Step B21, the corresponding relationship of the level of zoom and resolution ratio that service according to the map, determination need under different magnification levels
Altitude data resolution ratio value；
Step B22, the formula can also be expressed with latitude scope and latitudinal parameter value, and calculated result is consistent；
Step B23, the resolution ratio and resampling mode of the specified target altitude data file for needing to generate, resampling mode can be with
Select closest sampling or bilinear interpolation sampling etc.；
Step B24 carries out resampling to altitude data, obtains the altitude data of given resolution；
Step B3 is realized and is cut to altitude data:
Step B31 opens vector file by visualization tool, and selection needs the region retained, saves as new figure layer；Or it is logical
It crosses drawing tool and draws the region for needing to retain, and save as figure layer；
Step B32, multiple discontinuous regions, can save as multiple figure layers respectively if it exists, then carry out figure layer merging, and will
Figure layer output after merging is .shp file；
Step B33 is cut using grid handling implement, and input raster data are data to be cut, and output area is to use
In the VectorLayer of cutting, the value of empty data is set in cutting parameter；
The figure layer obtained after reduction is exported as raster data file by step B34.
Step B4 generates the grating image of Pictorial Map:
Step B41 checks the essential information of altitude data, calculates the height value range of the data and obtains the letters such as empty data value
Breath；
Step B42 determines the scheme of colour of Pictorial Map according to the display effect of the range of height value and needs, generates face
Color configuration file；
Step B43 generates colored landform raster data image according to specified color profile；
Step B5 generates massif echo:
Step B51, according to demand the vertical exaggeration coefficient in given process and unit, light azimuth, ray height angle,
Etc. series of parameters value；
Step B52 calculates massif shading value, calculation formula are as follows: Hillshade=255 × ((cos (Zneith) × cos
(Slope)+(sin (Zneith) × sin (Slope) × cos (Azimuth-Aspect))), wherein Zneith is sun apex angle,
Azimuth is solar elevation, and Slope is the gradient, and Aspect is slope aspect.Institute is angled using radian as unit of account；
Step B53, the calculation formula of the gradient are as follows: Slope=arctan ((h2-h1)/(x2-x1)), wherein h2-h1It is adjacent to represent two
The depth displacement of point, x2-x1Represent the horizontal distance between two consecutive points；
Step B54 generates massif shade raster data image according to calculated result；
Step B6 generates gradient echo:
Step B61 establishes gradient grating image according to altitude data, and specifies vertical unit in establishment process；
Step B62 establishes the color profile of gradient shadow image；
Step B63, the gradient shade grid map according to the gradient grating image and color profile of generation, after generating rendering
Picture.
Step B7 generates contour line data:
Step B71 determines contour interval according to the display effect of scaling level and needs；
Step B72 specifies the band number for generating contour, for save the field name of height value, contour interval information,
The parameters such as the contour vector file type of output, figure layer title；
Step B73 generates contour vector data file.
4. a kind of Pictorial Map production according to claim 1 and dissemination method, it is characterised in that: C batch is geographical empty
Between data render specific step is as follows:
Step C1 configures the spatial frame of reference of Mapnik rendering data.
Step C2 configures the render style of vector data and raster data, specifies the mark such as application level and point, line, surface of style
The genre parameters of note are arranged.
Step C3, the style name and data source of configuration vector data figure layer reference.
Step C4 adjusts the positional relationship of vector data figure layer and raster data figure layer, is combined into figure layer group.
Step C5 executes render process.
5. a kind of Pictorial Map production according to claim 1 and dissemination method, it is characterised in that: D standard is geographical empty
Between net source service publication specific implementation step it is as follows:
Step D1 prepares geographical spatial data and Mapnik render style file；
Step D2, starts WMS server, and bottom calls Mapnik rendering engine, publication WMS service；
Step D3 monitors the WMS request from client, and corresponding Map Service of Network data is returned to client.
6. a kind of Pictorial Map production according to claim 1 and dissemination method, it is characterised in that: E standard is geographical empty
Between net source service caching specific step is as follows:
Step E1 configures the cache path of WMS cache server.
Step E2 configures the WMS figure layer parameter of WMS cache server, such as coordinate system, range, tile format and request WMS figure layer
Group name and WMS service request address；
Step E3 starts WMS cache server, carries out pre-cache to the WMS figure layer of cache server configuration；
Step E4 is arranged to WMS server according to pre-cache and initiates WMS request, the Map Service of Network data that cache request arrives
To cache server；
Step E5 monitors the WMS request from client, the Map Service of Network data of caching is returned to client.
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| CN112052864A (en) * | 2020-10-20 | 2020-12-08 | 网易（杭州）网络有限公司 | Image drawing method and device, electronic equipment and readable storage medium |
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| CN112052864A (en) * | 2020-10-20 | 2020-12-08 | 网易（杭州）网络有限公司 | Image drawing method and device, electronic equipment and readable storage medium |
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| CN112700547B (en) * | 2021-03-23 | 2021-06-29 | 北京简巨科技有限公司 | Map making method and related equipment |
| CN112700547A (en) * | 2021-03-23 | 2021-04-23 | 北京简巨科技有限公司 | Map making method and related equipment |
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