Rafael,
>From experience, please correct me if this is inaccurate, geotifs don't
>contain the topo info needed in the Z coordinate for the terrain corrections,
>whereas a Geosoft grid does. Converting geotifs to Geosoft grids also doesn't
>supply the topo Z coordinate needed.
If free easily obtainable SRTM topography (in Geosoft GRD format) is not
accurate enough for your terrain corrections, You may have to eyeball manually
digitize, using Geosoft or some other software, any visible topo contour
numbers to an XYZ coordinate file, and then grid this XYZ file using Geosoft to
create the necessary elevation grid Geosoft uses for gravity terrain
corrections. You'd generate accurate XY coordinates this way, and then populate
the Z column with the eyeball determined numbers. The XY and Z coordinates all
need to be accurately geo-located on the elevation grid prior to terrain
correction.
Geotifs often have accurate XY coordinates, regular Tifs might have to be
geo-located first to the projection system used for your area.
On Tuesday, February 24, 2015 11:51 AM, "Rafael Rodriguez
<[email protected]>" <[email protected]> wrote:
<!--#yiv5354874790 .yiv5354874790hmmessage
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body.yiv5354874790hmmessage{font-size:12pt;font-family:Calibri;}-->Hi
everybody:
It is possible take one dtm in tif format for topographical correction? Or
what i do for make one tif image for make the dtm and then make the
topographical correction i geosoft?
Best regards
Rafael Rodriguez
Instituto Nacional de Geologia y Mineria
Caracas, Venezuela
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