![]() Here is a new mail I just received from Trent M Hare: We look forward to seeing the results of your work! Thank you for your interest in using HiRISE DTMs and for your feedback. There are other ways to get at these values, using statistics/histograms of the file, but reading it out of the label is probably the simplest. Our apologies for not having that in place when we released these products. We realize that this information is critical to use the DTM, so we will be adding these values soon to the Toolbox on each DTM web page. It contains the keywords VALID_MINIMUM and VALID_MAXIMUM. In a Unix Terminal, you can 'more' the file to read the label. This information is contained in the label embedded in the. > But with that solution, we would need to know the highest and the lowest altitude of the terrain to have a correct vertical scale. The associated Extra grayscale browse image displays the DTM this way, but at a much reduced size. > But Terragen 2 can also use black and white images to make the terrain: black for the lowest point, white for the highest. U2000 SOLAR ATTACHMENT TERRAGEN SOFTWAREThere are many commercial image analysis software packages available that can read these files, too. You can also use ISIS3 software from the USGS (also freely available) to convert the image data into other image formats. I am not an expert gdal user, so my ability to answer questions regarding that software is limited. This format can be converted to more common image formats and bit depths using the open source gdal software, for example. Maybe they will have some other insights they can share with you. I am also sharing this email with a few other people who have been experimenting with using our DTMs in various 3D rendering software packages. QuoteI am not familiar with Terragen software, but I can answer some of your questions. I send a mail to Sarah Mattson from HiRISE Contact, here is her answer: ![]()
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