johanvdw's user avatar
johanvdw's user avatar
johanvdw's user avatar
johanvdw
  • Member for 13 years, 4 months
  • Last seen more than a month ago
38 votes

Why does GPS positioning require four satellites?

26 votes
Accepted

Given a terrain, how to draw the stream flow path?

25 votes

Identifying Coordinate System of Shapefile when Unknown?

18 votes
Accepted

Calculating Topographic Ruggedness Index in ArcGIS Desktop?

15 votes

Why is the 'straight line' path across continent so curved?

12 votes
Accepted

Opensource solutions for finishing maps

11 votes
Accepted

Installing SAGA GIS 2.1

11 votes
Accepted

Open Source Tool capable of reading Esri File Geodatabase (.gdb)?

11 votes

How could I generate a CRS field inside the GeoJSON object created by Leaflet layer.toGeoJSON?

10 votes
Accepted

Determining statistical relationships between rasters using R vs ArcGIS Desktop?

10 votes

Are any fictional worlds available in some GIS format?

9 votes

Land Cover Feature Extraction from Satellite Imagery

9 votes
Accepted

R spplot tutorials

9 votes

What is the best format to encode polygons such as lakes?

8 votes

Seeking freely available GIS books?

8 votes

Open source methods for kriging?

7 votes

Surface distance on DEM between two coordinates

7 votes
Accepted

Web mapping software for a huge raster time series?

7 votes

Are there any attempts to replace the shapefile?

7 votes

Generating random but believable digital elevation model?

7 votes
Accepted

How to automatically plot intermediate contours with QGIS, GRASS GIS or SAGA GIS?

7 votes
Accepted

How to install Mapserver on Ubuntu?

6 votes
Accepted

Converting ms-access database into easy to use spatial database

6 votes

Performing Ordinary Kriging in SAGA via QGIS SEXTANTE Plug-in?

6 votes

Problems with NA values when reading .DEM file with R 'raster' package in Windows

6 votes

What is Lanczos resampling useful for in a spatial context?

6 votes

How can I programmatically determine if a shapefile contains points, polygons, or lines?

6 votes

Interpolation of Three Data Points

5 votes

How to generalize and vectorize a LandUseClassification raster file?

5 votes

Creating shapefile showing footprints of Rasters?

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