TransDEM Forum

Phil, the DEM's are opening just fine, when we open them as "Open DEM" but when I wish to add additional DEM's from Norway via "Add DEM's" option they give an opening error. So I have to save each file as a Transdem .dem file and then add those together, a minor inconvenience, but still.

Just another question, that 1-5 metre upscaling that TransDEM does, does it do so with interpolation, or binning, or maybe in some other way? How do we get five metres accuracy from one? Well, until now, it was just plain re-sampling, using bilinear interpolation from adjacent source points. While ...

Thank you so much for taking the time to write this tutorial! Looking forward to seeing what kind of routes our fellow Trainz users will create with this new data.

Meanwhile the Norwegian 1m DEMs appear to work in my lab environment with both the "USGS DEM" and the GeoTiff formats. I have to merge that into the release version and prepare a patch. New version will be TransDEM 2.6.2.2, hopefully over the weekend.


Amazing work Geophil, I really appreciate ...

There are standards and there is interpretation of standards. This makes things complicated.

For the .dem file format, Norway has adopted and adapted that older USGS format. When I first analysed it a few years ago, I found certain meta-data fields set to values not listed in the USGS specs. But ...

Norwegian DEM's still don't work for me, even with the latest version. Would love if someone could look into it.

Good evening.

I've recently got myself some Norwegian DEMs as I decided to try the route building out in TANE. Downloaded both GeoTIFF and .dem formats, which TransDEM doesn't open at all sadly. I was looking forward to taking a look at their 0.25m accuracy tiles. Here are two file sample included ...

Dear Rwarren, the images need to be bound in coordinates to some form of terrain and cannot be exported by themselves. Perhaps you should read the tutorial and manual provided with the program?

Dear RWarren , are you exporting the map as ground textures, or base maps? If you put even the sharpest texture on the 5m texture grid it becomes blurry. You should export your route's surroundings as basemap tiles. I am no good at the terms myself. Perhaps dear Geophil could explain more. It would ...

Sorry for the doublepost, I gathered the information about the updates should be in a separate post.

Dear Geophil
The Yandex Map Tile information has been updated to
tiles?l=map&v=2.20.0

And the Satellite images to
tiles?l=sat&v=1.25.0

Please have that in mind for further TransDem Map Tile ...