1,857 reputation
733
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location Lisbon, Portugal
age 36
visits member for 2 years, 9 months
seen Apr 9 at 10:33

Jul
18
accepted How to delete fields in QGIS?
Jul
18
comment How to delete fields in QGIS?
Isn't it a bit annoying to have to install a plugin in order to delete fields? thanks
Jul
18
asked How to delete fields in QGIS?
Jul
15
accepted How to join external tables with a shapefile's attribute table in QGIS?
Jul
15
asked How to join external tables with a shapefile's attribute table in QGIS?
Jul
14
awarded  Tumbleweed
Jul
14
comment Clipping a raster using a polyline or polygon
only problem with this -cutline parameter is that the resulting raster comes with a mislocation of ~1 pixel...
Jul
14
accepted How to count pixels of a raster in polygons using QGIS?
Jul
14
comment How to count pixels of a raster in polygons using QGIS?
i don't think its limited to small rasters, check this: starspan.casil.ucdavis.edu/doku/doku.php?id=lfs. why not give it a try.
Jul
14
comment How to count pixels of a raster in polygons using QGIS?
This StarSpan only does this raster on vector analysis. Basicaly it strips the raster into a text/csv file where it includes also attributes from the coincident polygons. Then it has the ability to aggregate and produce statistics for the polygons. For example, polygon with id=1, avg_raster_value=4.5, mode_raste_value=4...and so on. Its very simple and works fine.
Jul
14
answered How to count pixels of a raster in polygons using QGIS?
Jul
14
answered Grass v.rast.stats returning null values
Jul
14
awarded  Commentator
Jul
14
comment How to count pixels of a raster in polygons using QGIS?
I was trying this v.rast.stats but i had this: Processing data ... Updating the database ... ERROR: This should not happen: wrong return type in parsing. dbmi: Protocol error ERROR: Error while executing:
Jul
13
comment How to count pixels of a raster in polygons using QGIS?
I think is is more what i need, cause v.rast.stats first converts the vector to raster with the inputed resolution, and that doesn't work for me. If I convert the raster to poly and intersect the two vector files, then i would need to aggregate and sum the areas per raster category for each polygon. How do i do this in GRASS?
Jul
13
answered QGIS 1.6.0 problem during printing & export to PDF
Jul
12
comment Freeware alternatives to eCognition?
I did it with the super-clumsy SPRING. I had to clip the image in 3... import the TIFs into SPRING, perform Segmentation and then export the result into another tif. Then I had to vectorize the tif with QGIS. This was the best solution i found.
Jul
12
comment Freeware alternatives to eCognition?
I tried it how, but I didn't manage to perform my task
Jul
12
accepted What is the shell command for the tool 'simplify geometry' in QGIS?
Jul
12
asked How to count pixels of a raster in polygons using QGIS?