Hi Javier,
<br/><br/>EGM96 (I guess somethin' like 'Earth Geodetic Model') refers to the
<br/>vertical datum. If you only need relative height information (e.g. for
<br/>watershed analysis), you do not need information retrieved from the
<br/>vertical datum. However, if you need absolute heights (e.g. height
<br/>above sea level), you should recalculate the height values (substract
<br/>EGM96 offset from Aster DEM heights) according to the region of your
<br/>DEM.
<br/><br/>Hope that helps
<br/>Stefan
<br/><br/>Quoting "Javier García [via OSGeo.org]"
<br/><<a href="/user/SendEmail.jtp?type=node&node=4650802&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>>:
<br/><div class='shrinkable-quote'><br/>>
<br/>>
<br/>>
<br/>> Hi, I have a question that i hope you can help me.
<br/>> I want to use some aster Dem, but in specifications I read that
<br/>> aster Dem is using EGM96
<br/>> geoid . Do I have to do something special to use those DEM's?
<br/>>
<br/>> The zone that I work is WGS84 147N.
<br/>>
<br/>> Thanks in advance for the answer.
<br/>>
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