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Jul
25
answered nearest neighbor query in SpatiaLite
Jul
24
comment Create raster with grid cells values based on area covered by polygons
Great! and thanks for adding the edits, so the solution is complete for future.
Jul
21
answered Create primary and foreign key on Spatialite
Jul
11
revised Create raster with grid cells values based on area covered by polygons
added 550 characters in body
Jul
11
comment Create raster with grid cells values based on area covered by polygons
Yes, you're right. Each cell will have the full area of the polygon that it intersects. I misunderstood your question. I think you can get the part of each raster cell covered by the polygon by first creating a vector of polygon grids at the raster resolution, then intersecting that with the forest polygons. See my edits above.
Jul
10
answered Create raster with grid cells values based on area covered by polygons
Jul
5
comment Maps with numbers and postcodes using QGIS?
Two questions to clarify what you already have: Are the postcodes and survey already spatial data? And does the list of survey participants have the postcode for each survey?
Jul
3
answered How can I create polygons for a 3D map from a DEM in grass/qgis
Jun
30
answered How to use r.mapcalculator to change values within a raster cost map to negative
Jun
29
answered Interpolation extent
Jun
27
comment GeoTiff exported using GRASS will not open in other programs
Can you double check that your region settings match the image group that you want to export? g.region -p and r.info -g <one of your rasters that makes up the image group>
Jun
20
answered Create statistics by features in QGIS
Jun
18
comment comparison of atmopsheric correction methods
No, as I said, DOS methods are atmospheric correction only. But if you are running the i.*.toar module, then you can choose to do both radiometric correction, and atmospheric correction thru one of the DOS methods.
Jun
18
answered comparison of atmopsheric correction methods
Jun
10
comment How to fill a hole - with islands within?
Go back to GRASS and add a centroid in that empty boundary.
Jun
9
comment Performing spatial join in Spatialite (QspatiaLite for QGIS)
Can you copy/paste your full SQL command here? Also, I see an extra comma at the end of the last "max(...)" line: max("Apt_Bldg_Footprints".'MAX_HEIGHT') as MAX_HEIGHT, <= remove this comma.
Jun
5
revised How can I extract a smooth river network with QGIS & GRASS?
added 430 characters in body
Jun
5
answered Performing spatial join in Spatialite (QspatiaLite for QGIS)
Jun
5
answered How can I extract a smooth river network with QGIS & GRASS?
Jun
4
comment How can I extract a smooth river network with QGIS & GRASS?
Most likely your region settings have a resolution that is too coarse. What does g.region -p give you? What is the resolution of the original elevation data?