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I want points for practicing triangulation algorithms.

Just points with coordinates [X,Y] and elevation [Z] of real world terrain.

I can use Google Maps Elevation API, but there is no method how to get only significantly terrain points.

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marked as duplicate by Andre Silva, PolyGeo May 20 at 4:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 7 down vote accepted

I provide a number of sample LiDAR files at http://liblas.org/samples that you can download. These are mostly example data, but many are quite interesting. You can use the las2txt utility that libLAS provides (or Isenburg's las2txt version as well) to convert them to XYZ ascii files.

Isenburg's tools also provide a number of fantastic triangulation algorithms that anyone looking to manipulate and work with high-throughput LiDAR-derived elevation data should have working knowledge about.

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One option is using the sample *.las files on this site: http://www.cs.unc.edu/~isenburg/lastools/ The site also contains tools to convert them to xyz text files.

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