Hi Javier,
<br/><br/>EGM96 (I guess somethin' like 'Earth Geodetic Model') refers to the
<br/>vertical datum. If
<br/>you only need relative height information (e.g. for watershed
<br/>analysis), you do not need
<br/>information retrieved from the vertical datum. However, if you need
<br/>absolute heights
<br/>(e.g. height above sea level), you should recalculate the height
<br/>values (substract EGM96
<br/>offset from Aster DEM heights) according to the region of your 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=4650804&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/>>
<br/>> _______________________________________________
<br/>> grass-user mailing list
<br/>> <a href="/user/SendEmail.jtp?type=node&node=4650804&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>
<br/>> <a href="http://lists.osgeo.org/mailman/listinfo/grass-user" target="_top" rel="nofollow" link="external">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br/>>
<br/>>
<br/>> _______________________________________________
<br/>> If you reply to this email, your message will be added to the
<br/>> discussion below:
<br/>> <a href="http://osgeo-org.1560.n6.nabble.com/Aster-DEM-tp4650688p4650688.html" target="_top" rel="nofollow" link="external">http://osgeo-org.1560.n6.nabble.com/Aster-DEM-tp4650688p4650688.html</a><br/>> To start a new topic under Grass - Users, email
<br/>> <a href="/user/SendEmail.jtp?type=node&node=4650804&i=2" target="_top" rel="nofollow" link="external">[hidden email]</a>
<br/>> To unsubscribe from Grass - Users, visit
<br/>> <a href="" target="_top" rel="nofollow" link="external">
<br/><hr align="left" width="300" />
View this message in context: <a href="http://osgeo-org.1560.n6.nabble.com/Aster-DEM-tp4650688p4650804.html">Re: Aster DEM</a><br/>
Sent from the <a href="http://osgeo-org.1560.n6.nabble.com/Grass-Users-f3884509.html">Grass - Users mailing list archive</a> at Nabble.com.<br/>