Tagged Questions
0
votes
2answers
75 views
Handling MODIS NoData cells with gdalwarp
I'm using the gdalwarp tool to convert MODIS .hdf into GeoTiff files. I want to set the value of the nodata cells so that when I import the .tif image into Grass there is no black edge. I'm using the ...
1
vote
1answer
152 views
Rasterize vector with gdal
"I would like to calculate the Euclidian distance from a residence to a public service of interest e.g. the distance from a residence to a green space (as the crow flies) in QGIS. After browsing the ...
4
votes
1answer
84 views
Programmatic raster-vector calculation
I currently use GRASS' r.mapcalc to find the difference between vector and raster data using a loop and temporary files and layers.
Is it possible to do the core calculation between raster with a ...
2
votes
1answer
207 views
Is it possible to produce a decent looking shaded-relief map at 50K-scale-or-larger using SRTM3 DEM?
I'm trying to make a decent-looking shaded-relief map of a particular area in 50K-scale-or-larger using open-source tools. The best (and free) option I have for DEM data for that area right now is the ...
3
votes
1answer
384 views
Cell calculations; QGIS,GRASS,GDAL,SAGA
I recently asked a question about trying to calculate the slope over distance (manually) using QGIS, but then I came up with another way of solving the problem, but I would have to get some help for ...
1
vote
0answers
257 views
gdal-grass plugin for gdal 1.8 [closed]
I'm facing a big issue...i moved from the ubuntugis version of grass to the svn one.
I managed to compile the svn (releasebranche6.4) version nicely but i can't download the gdal-grass plugin for ...
4
votes
2answers
530 views
What's a good toolchain to reproject some PNGs in plate carre to UTM?
I have some PNGs produced from Canadian DEM data. They're 1201px by 1201px heightmaps. Each one represents one quarter of a degree latitude and one quarter of a degree longitude.
But I want to work ...
5
votes
1answer
417 views
What is north-up projection?
How do I know what projection to use for north-up or 0 rotation? I have a gtiff (ND83-nf) that gives me the error when importing to Grass. Should I re-project or recreate the image with the rotation ...
