New answers tagged terrain
For Germany you can order the DGM10 from the Federal Agency for Cartogrpahy. The Official Elevation Datasets are available in 10 m to 1000 m spatial resolution with a height accuracy of 0.5-2 m.
When you say it is all in the folder ready to go, I suspect you have been fooled by OS helpfully compressing and recompressing and recompressing the data for you. I have a file called terr50_gagg_gb.zip which contains data and doc folders. On unpacking it inside data I have a series of folders hp to tv for the OS grids covered. In each of these are 6 and 100 ...
Dynamic or real-time viewing For real-time viewing, start with the Virtual Terrain Project. Open source from a proficient developer it has native GIS smarts. Even if you opt not to use VTP the website itself is the best curated list of data and white paper resources on terrain modelling I'm aware of -- including short evaluations of other 3D terrain ...
I agree with @just-GIS. You can use the slope or the aspect derivate (r.slope.aspect) from your terrain model to search for flat areas. Once you have identified them and you are OK with the results you can use r.to.vect to convert your raster map into a vector format.
Run the aspect tool r.slope.aspect. Try the < min_slope option set to a very low number. The unclassified areas are your flat area. Play with the setting to get it just how you like. You can then use r.reclass to reclass the aspects created so something like -1 and the gap areas as 1. Now multiply this my the original raster and all your areas are ...
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