WPS/pl
< WPS
OGC Web Processing Service (WPS) w GRASS standardowe implementacje
W GRASS 7
W GRASS7, opis procesu WPS może być automatycznie wygenerowany z opcją '--wps-process-description'. Zobacz announcement.
Przykład:
r.grow --wps-process-description
<?xml version="1.0" encoding="UTF-8"?>
<wps:ProcessDescriptions xmlns:wps="http://www.opengis.net/wps/1.0.0"
xmlns:ows="http://www.opengis.net/ows/1.1"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wps/1.0.0
http://schemas.opengis.net/wps/1.0.0/wpsDescribeProcess_response.xsd"
service="WPS" version="1.0.0" xml:lang="en-US">
<ProcessDescription wps:processVersion="1" storeSupported="true" statusSupported="true">
<ows:Identifier>r.grow</ows:Identifier>
<ows:Title>Generates a raster map layer with contiguous areas grown by one cell.</ows:Title>
<ows:Abstract>The manual page of this module is available here: http://grass.osgeo.org/grass70/manuals/html70_user/r.grow.html</ows:Abstract>
<ows:Metadata xlink:title="raster" />
<DataInputs>
<Input minOccurs="1" maxOccurs="1">
<ows:Identifier>input</ows:Identifier>
<ows:Title>Name of input raster map</ows:Title>
<ComplexData maximumMegabytes="2048">
<Default>
<Format>
<MimeType>image/tiff</MimeType>
</Format>
</Default>
<Supported>
<Format>
<MimeType>image/tiff</MimeType>
</Format>
<Format>
<MimeType>image/geotiff</MimeType>
</Format>
<Format>
<MimeType>application/geotiff</MimeType>
</Format>
<Format>
<MimeType>application/x-geotiff</MimeType>
</Format>
<Format>
<MimeType>image/png</MimeType>
</Format>
<Format>
<MimeType>image/gif</MimeType>
</Format>
<Format>
<MimeType>image/jpeg</MimeType>
</Format>
<Format>
<MimeType>application/x-erdas-hfa</MimeType>
</Format>
<Format>
<MimeType>application/netcdf</MimeType>
</Format>
<Format>
<MimeType>application/x-netcdf</MimeType>
</Format>
</Supported>
</ComplexData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>radius</ows:Identifier>
<ows:Title>Radius of buffer in raster cells</ows:Title>
<LiteralData>
<ows:DataType ows:reference="xs:float">float</ows:DataType>
<ows:AnyValue/>
<DefaultValue>1.01</DefaultValue>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>metric</ows:Identifier>
<ows:Title>Metric</ows:Title>
<LiteralData>
<ows:DataType ows:reference="xs:string">string</ows:DataType>
<ows:AllowedValues>
<ows:Value>euclidean</ows:Value>
<ows:Value>maximum</ows:Value>
<ows:Value>manhattan</ows:Value>
</ows:AllowedValues>
<DefaultValue>euclidean</DefaultValue>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>old</ows:Identifier>
<ows:Title>Value to write for input cells which are non-NULL (-1 => NULL)</ows:Title>
<LiteralData>
<ows:DataType ows:reference="xs:integer">integer</ows:DataType>
<ows:AnyValue/>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>new</ows:Identifier>
<ows:Title>Value to write for "grown" cells</ows:Title>
<LiteralData>
<ows:DataType ows:reference="xs:integer">integer</ows:DataType>
<ows:AnyValue/>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>-m</ows:Identifier>
<ows:Title>radius is in map units rather than cells</ows:Title>
<LiteralData>
<ows:DataType ows:reference="xs:boolean">boolean</ows:DataType>
<ows:AllowedValues>
<ows:Value>true</ows:Value>
<ows:Value>false</ows:Value>
</ows:AllowedValues>
<DefaultValue>false</DefaultValue>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>grass_resolution_ns</ows:Identifier>
<ows:Title>Resolution of the mapset in north-south direction in meters or degrees</ows:Title>
<ows:Abstract>This parameter defines the north-south resolution of the mapset in meter or degrees, which should be used to process the input and output raster data. To enable this setting, you need to specify north-south and east-west resolution.</ows:Abstract>
<LiteralData>
<ows:DataType ows:reference="xs:float">float</ows:DataType>
<UOMs>
<Default>
<ows:UOM>meters</ows:UOM>
</Default>
<Supported>
<ows:UOM>meters</ows:UOM>
<ows:UOM>degrees</ows:UOM>
</Supported>
</UOMs>
<ows:AnyValue/>
<DefaultValue>25</DefaultValue>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>grass_resolution_ew</ows:Identifier>
<ows:Title>Resolution of the mapset in east-west direction in meters or degrees</ows:Title>
<ows:Abstract>This parameter defines the east-west resolution of the mapset in meters or degrees, which should be used to process the input and output raster data. To enable this setting, you need to specify north-south and east-west resolution.</ows:Abstract>
<LiteralData>
<ows:DataType ows:reference="xs:float">float</ows:DataType>
<UOMs>
<Default>
<ows:UOM>meters</ows:UOM>
</Default>
<Supported>
<ows:UOM>meters</ows:UOM>
<ows:UOM>degrees</ows:UOM>
</Supported>
</UOMs>
<ows:AnyValue/>
<DefaultValue>25</DefaultValue>
</LiteralData>
</Input>
<Input minOccurs="0" maxOccurs="1">
<ows:Identifier>grass_band_number</ows:Identifier>
<ows:Title>Band to select for processing (default is all bands)</ows:Title>
<ows:Abstract>This parameter defines band number of the input raster files which should be processed. As default all bands are processed and used as single and multiple inputs for raster modules.</ows:Abstract>
<LiteralData>
<ows:DataType ows:reference="xs:integer">integer</ows:DataType>
<ows:AnyValue/>
</LiteralData>
</Input>
</DataInputs>
<ProcessOutputs>
<Output>
<ows:Identifier>output</ows:Identifier>
<ows:Title>Name for output raster map</ows:Title>
<ComplexOutput>
<Default>
<Format>
<MimeType>image/tiff</MimeType>
</Format>
</Default>
<Supported>
<Format>
<MimeType>image/tiff</MimeType>
</Format>
<Format>
<MimeType>image/geotiff</MimeType>
</Format>
<Format>
<MimeType>application/geotiff</MimeType>
</Format>
<Format>
<MimeType>application/x-geotiff</MimeType>
</Format>
<Format>
<MimeType>application/x-erdas-hfa</MimeType>
</Format>
<Format>
<MimeType>application/netcdf</MimeType>
</Format>
<Format>
<MimeType>application/x-netcdf</MimeType>
</Format>
</Supported>
</ComplexOutput>
</Output>
</ProcessOutputs>
</ProcessDescription>
</wps:ProcessDescriptions>
WPS workflow idea
Zewnętrzne mapy rastrowe mogą być zlinkowane do GRASS-a za pomocą r.external. Oszczędza to czas i przestrzeń dyskową. Dodatkowo, nie ma już potrzeby przechowywania wyniku w wewnętrznym formacie GRASS-a; z r.external.out mapy wynikowe są bezpośrednio zapisywane w formacie obsługiwanym przez bibliotekę GDAL.
Prygotowania
GRASS can be used in an automated way by just defining a set of variables. See here for GRASS and Shell settings and GRASS and Python.
Data flow example
Skrypt może wyglądać jak poniżej:
# register GeoTIFF file in GRASS database: r.external terra_lst1km20030314.LST_Day_1km.rst.tif out=modis_celsius # define output directory for GRASS calculation results: r.external.out /srv/gisoutput/ # do something (here: extract pixels > 20°C), write output directly as GeoTIFF: r.mapcalc "warm.tif = if(modis_celsius > 20, modis_celsius, null() )" # use the result elsewhere qgis /srv/gisoutput/warm.tif
Linking to WPS server
A framework has been developed to make the integration of GRASS GIS 7 in WPS server as easy as possible. The framework is called wps-grass-bridge and is available here:
- wps-grass-bridge: http://code.google.com/p/wps-grass-bridge/
This framework support currently PyWPS, ZOO WPS and is used by 52North WPS server. Many GRASS GIS 7 modules can be attached out of the box.
There are currently several other WPS implementations which use GRASS as GIS backbone:
- PyWPS: http://pywps.wald.intevation.org/
- PyWPS and wps-grass-bridge connector: http://code.google.com/p/wps-grass-bridge/wiki/PyWPS_Integration
- Gallery (live examples)
- PyWPS and GRASS Wiki: http://pywps.wikispaces.com/GRASS
- WPS by 52N: http://52north.org/maven/project-sites/wps/52n-wps-site/
- Connecting to GRASS out of the box: http://52north.org/maven/project-sites/wps/52n-wps-webapp/
- 52N-WPS-GRASS Demo
- ZOO project - Open OSW Platform: http://www.zoo-project.org/
Referencje
This page is in progress of translating to Polish from English.