I have a lot of XYZ points which are the base of a DEM/DTM. Sometimes there are too many points so they should be reduced.
So I'm seeking for ideas / algorithms / solutions relating ..
- what to reduce? Better the points from raw data then the points from DTM - but is it possible (without TIN)?
- how to reduce? There are some ways to calculate - min, max, average, max. differences in height or slope or ..
- existing solutions? The best way - "take solution XY from here, it's great and it's free"
(I know the "lastools", but the pricing is not that funny ..)