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Last Post 13 Sep 2006 10:30 AM by  anon
DEM Extraction using wizard
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anon



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13 Sep 2006 10:30 AM
    I was trying to creat DEM using ASTER L1A stero data i.e 3B and 3N. I was using DEM wizard in 4.2 which has 9 steps. I was creating absolute DEM using auto SCP. In the final dem output i am getting negative values like -78, -100 whereas study area having average elevation of 10m. Can anybody pointout where i am doing misttake. Thanks in advance.

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    15 Sep 2006 09:19 AM
    For a brief explanation of why negative values might be showing up, you can look at this Tech Tip on our site: http://www.ittvis.com/ser...echtip.asp?ttid=3995 Also, negative values are common in areas containing a lot of water, clouds, and shadow. These values can be changed by using the Editing tool that comes with the extraction module.
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