5,408 reputation
514
bio website surfaces.co.il
location Israel
age
visits member for 3 years, 1 month
seen 1 hour ago

I work at the Arava Drainage Authority and Regional Council in southern Israel, doing hydrological analysis and general mapping. Involved with open source software since 1996, and FOSS GIS since 2006. I've also organized a few short GIS training seminars based on open source software.


1h
comment Calculate area intersected areas, problem
And when you reproject with ArcGIS what do you get? Are the new shapefiles then in the Albers Equal Area projection? I you have the original data, and you can share it, we could have a look...
1d
comment Calculate area intersected areas, problem
What do you by "Reprojecting doesn't work". What do you get if you do "Save As..." and choose the Albers Equal Area projection of the Catchments layer? You should NOT use the "Define current project". That often confuses folks.
Apr
25
answered Calculate area intersected areas, problem
Apr
25
answered Map-matching GPS points to the road network!
Apr
25
comment Calculate area intersected areas, problem
If you calculate the areas of the original polygons, do you get expected values? Is it possible to get a sample of your layers? And one more (annoying), questions: are you sure all layers are in the same meter-based CRS?
Apr
25
comment solar radiation r.sun
From the error message, the computer is running out of memory running the module. The region settings (13342 rowsx16634 cols) mean that each raster has over 220 million cells. If the rasters are integer, then each one would require about 900MB of memory. FLoating point rasters, twice as much.
Apr
25
awarded  grass
Apr
24
answered How to export a GTiff with its GDAL colour table, in GRASS, which is suitable for Adobe Illustrator?
Apr
18
comment Buffer View With SpatiaLite and QGIS
IIUC a spatial view in Spatialite must have a real, existing geometry column, not something that's created in the query.
Apr
16
answered Combining spatially identical polylines in the same layer
Apr
14
comment Combining spatially identical polylines in the same layer
Can you comment on how "same/similar" the polylines in opposite directions are? For example, would a buffer of 1 meter around 1 line always contain the line in the opposite direction? Does your check for xmin and xmax always catch the line pairs?
Apr
11
answered How to count points within adjoining hex grid cells?
Apr
11
comment Geoserver - How to make a psql-backed timestamp that uses timezones
Don't know about your application, but in postgreSQL you can do: ALTER TABLE <your table> ALTER COLUMN <timestamp column> TYPE TIMESTAMP WITH TIME ZONE;
Apr
11
comment How to smooth a shaded relief map created with the command r.relief in GRASS 7?
Two possibilites come to mind: r.samp.rst is designed to resample and smooth a raster. If you leave the resolution as the original, then it will just smooth. Also a simple r.neighbors might also serve your purpose.
Apr
11
comment GRASS GIS r.walk issue
Rule number one with GRASS: always setup the region before doing anything else. This must include both the extent and pixel size.
Apr
10
comment GRASS GIS r.walk issue
Try an output name that is not a reserved work. Something like 'my_output'. To overwrite an exisiting raster you need to tick the "Allow overwrite..." checkbox in the "Optional" pane.
Apr
10
comment Find the area of points in PostGIS?
Thanks for the correction
Apr
8
comment Find the area of points in PostGIS?
Unless some points are closer than 50 meters and the circles overlap...
Apr
8
answered Generate a raster with a uniform value using QGis
Apr
8
answered I want to compare multiple raster layers against each other to identify changes in pixel values over time