2 cents from Greece: What I do is take the SRTM dats from NASA, pass them through vtopo's "gensur" stand-alone programme which makes a text file with height data for whichever part of the inputted SRTM file interests you. Then I take this to Therion and convert the header text of the .sur file into the Therion format: #Surface 231.836 235.996 0.080 53 3909.144 3915.084 0.090 67 grid 231836 3909144 80 90 53 67 Above, the header of the .sur file is placed above the grid line of the Therion file. The first 2 numbers are the UTM beginning and end of the data in Km on the X-axis. Only the first number needs to be turned into m (multiply by 1000) and put as the first figure on the Therion line. The third number is the spacing of the info: 0.080 (Km) meaning that the points are 80m apart on the x axis. This becomes the third figure in the Therion format. The fourth number is the number of entries, or the size of the grid on the X axis. This number is placed as the fifth figure in the Therion format. The fifth and sixth are the limits of the data on the Y axis - again, only the beginning is interesting to us and it is multiplied by 1000 and placed as the second figure in the Therion format. The seventh number is the spacing of the info: 0.090 (Km) meaning that the points are 90m apart on the Y axis. This becomes the fourth figure in the Therion format. The eighth number is the number of entries, or the size of the grid on the Y axis. This number is placed as the sixth figure in the Therion format. To do this is just as complex as it sounds, and you need to keep your wits about you when selecting the limits of the gensur export from the SRTM data. I usually keep the gensur header in the Therion file with a hash for reality-checks as necessary. Cheers, Stelios At 11:53 08/07/2009, you wrote:
Is there a way to (easily) extract terrain model data from Google Earth in a format that can be used by Therion / Loch?
Bruce _______________________________________________ Therion mailing list Therion@speleo.sk http://mailman.speleo.sk/mailman/listinfo/therion