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ok i see what is going on. the output of arcgis is in 1/100 of a z unit. so I had to divide entire raster by 100 to obtain the correct values. thanks and sorry for creating a thread


Similar to Rob Skelly's suggestion, I would second using 30m SRTM data. I know Whitebox has a great tool for this that will download the SRTM files and process the DEM in one shot based on your area. From here you can create contour or basins from the DEM.


You might try downloading the 30m SRTM for your region and deriving the contours yourself. It's available through EarthExplorer for free. Contours can be generated with the Raster > Extraction > Contour tool in QGIS.


I would suggest looking at the GDAL/OGR libraries and their Java bindings. The javadocs are here, gdal.org . They're in the in the Maven repo as well. (Not tried the Java bindings, only the python ones, but they look identical). The following question gives an example of what you're trying to do (it's in python, but the java bindings should be the same). ...


This is very similar to a question the other day relating to rising water levels. You could likely use the Interpolate Shape tool (http://resources.arcgis.com/en/help/main/10.1/index.html#/Interpolate_Shape/00q90000006m000000/) in some fashion. The simplest way would probably be to reclass the dem ...


Creating maps is component of QGIS, but it is not the primary purpose of that or any other GIS program. Analysis is, including answering the kind of question you have (where are the lowest/highest points). You mention you did 'the tutorial' but not which one. There are a few specifically dedicated to working with terrain and elevation, for example: ...


This could be done with Arc's Topo To Raster tool. This tool uses some algorithm for interpolating a raster surface from data you would find on a topographic map. There's a lot going on in this tool, so take the time to read through the Arc resources page for best results. You can set contours as your primary data source, and it will generate a surface ...


To get a coloured picture of the AHN DEM, add a NODATA value of -2147483647 in the Transparency tab. In the Style tab, load the Extrema ( not the default 2% to 98%) and select one channel pseudo colour. With the Spectral colour ramp [x] inverted, the output looks like this: For the viewshed, I clipped the data to my area of interest and converted the ...

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