5,703 reputation
514
bio website surfaces.co.il
location Israel
age
visits member for 3 years, 3 months
seen yesterday

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.


1d
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?
Jun
2
answered Isolation and interpretation of vineyard multispectral data
May
22
comment How to merge two rasters when are on the same place
If your first raster is a shaded relief, then it does NOT contain elevation values, rather colors to show a kind of 3D picture. What you need is the original raster of height values that was used to create this "picture of relief"
May
22
comment Receiving NULL values from Point Sampling Tool in QGIS
OK, you would see identical CRS information in the Metadata since you had already set that using "Set Layer CRS". I added a second option to accomplish the task with GRASS, if you choose. Edited in the above answer.
May
22
revised Receiving NULL values from Point Sampling Tool in QGIS
added 814 characters in body
May
21
comment Create blank table from unix shell
BTW, shp2pgsql should not need empty tables created in advance. It just outputs the full SQL commands for creating and populating spatial tables, to be piped into pgsql.
May
21
revised Receiving NULL values from Point Sampling Tool in QGIS
added 2 characters in body