[postgis-devel] [PostGIS] #297: [wktraster] Implement ST_AsPolygon function for raster

PostGIS trac at osgeo.org
Mon Dec 21 14:11:34 PST 2009

#297: [wktraster] Implement ST_AsPolygon function for raster
  Reporter:  mloskot    |       Owner:  jorgearevalo   
      Type:  task       |      Status:  assigned       
  Priority:  high       |   Milestone:  WKTRaster 0.1.6
 Component:  wktraster  |     Version:  trunk          
Resolution:             |    Keywords:                 
Comment (by pracine):

 Replying to [comment:1 mloskot]:
 > Pierre,
 > Technically, we can use GDAL function, namely
 [http://www.gdal.org/gdal__alg_8h.html GDALPolygonize].
 > However, we have to keep in mind what steps it would require on various
 levels of use and deployment. It is, roughly:
 >  * GDAL requirement, compile-time and run-time
 >  * Translation of WKT Raster WKB to
 [http://www.gdal.org/classGDALDataset.html GDALDataset] with bands (likely
 using GDAL MEM driver)
 >  * Call to GDALPolygonize to generate
 [http://www.gdal.org/ogr/classOGRLayer.html OGRLayer]
 >  * Translation of [http://www.gdal.org/ogr/classOGRGeometry.html
 OGRGeometry] objects attached to OGRLayer to PostGIS geometry

 Sounds good!

Ticket URL: <http://trac.osgeo.org/postgis/ticket/297#comment:8>
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