<div>Tamas-</div>
<div> I've done some futher tracking on this and I found out the problem seems to actually be a difference in how the SVN version of GDAL warps and how an older development version warps. I warped the USGS DRG file for Mount Rainier West- available here:</div>
<div><a href="http://rocky.ess.washington.edu/data/raster/drg/yakima/o46121g7.zip" target="_top" rel="nofollow">http://rocky.ess.washington.edu/data/raster/drg/yakima/o46121g7.zip</a></div>
<div> </div>
<div>to EPSG:32610 (WGS84 UTM Zone 10N)- these files were NAD27 UTM Zone 10N to start out. On a pixel by pixel basis the files are exactly the same- but if you examine the GDALInfo output I attached you will see the Origin data written to the files is almost 100 Meters off the Northing dimension, and about 50 meters off the Easting dimension. If you plot a coordinate into the reprojected maps (the summit of Rainier works well) you can see the old version reprojects correctly, the new version is off by a significant amount.</div>
<div>Summit coordinates should be: <span class="geo"><span class="latitude" title="Latitude">46.852778</span>, <span class="longitude" title="Longitude">-121.760278</span></span></div>
<div><span class="geo"><span class="longitude" title="Longitude"></span></span> </div>
<div>I'm not sure the exact versions of the library I'm using but the old version that seems to work is from FWTools 2.3.0 and the new SVN version is from a recent automated Windows build SDK built on 6/1/09.<br>
</div>
<div class="gmail_quote">On Tue, Jun 2, 2009 at 2:30 PM, Tamas Szekeres (via Nabble) <span dir="ltr"><<a href="http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3020052&i=0" target="_top" rel="nofollow">ml-user%2B63011-1539807046@...</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi,<br><br>I'm not sure about this problem, I suspect cascading the vrt datasets should normally work. Could you provide your complete C# example to produce the output and the gdal_warp command line to examine the difference? <br>
<br>Best regards,<br><br>Tamas<br><br><br><br>
<div class="gmail_quote">2009/5/31 edomazlicky <span dir="ltr"><<a href="http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3014818&i=0" target="_blank" rel="nofollow">edomazlicky@...</a>></span><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"><br>I am trying to warp a NAD27 UTM file to Google Mercator 900913. My<br>understanding is that for this to happen you have to first warp the file to<br>
WGS84 and then to 900913. I have tried going straight from NAD27->900913 and<br>I get projection errors similar to if you plotted a WGS84 coordinate on a<br>NAD27 map. So to accomplish this two-step warp I have been trying to do<br>
something kind of like this:<br><br>Dim oWGS84 As New OSGeo.OSR.SpatialReference("")<br>' WGS84 UTM Zone 10<br>oWGS84.ImportFromEPSG(32610)<br>Dim wgs84_wkt As String = ""<br>oWGS84.ExportToPrettyWkt(wgs84_wkt, 0)<br>
InterMed = OSGeo.GDAL.Gdal.AutoCreateWarpedVRT(SrcGdalDataSet, src_wkt,<br>wgs84_wkt, eReSample, 0.125)<br>GdalDataSet = OSGeo.GDAL.Gdal.AutoCreateWarpedVRT(InterMed, wgs84_wkt,<br>dst_wkt, eReSample, 0.125)<br><br>Where src_wkt contains the NAD27 WKT and dst_wkt contains the 900913 WKT.<br>
This doesn't work- I am getting the same results I get if I try to go<br>straight from NAD27->900913. However if instead I warp the file in gdal_warp<br>first to WGS84 and then go from that to 900913 it works fine. Is there<br>
anyway to warp these files without making a new file fist? I would like for<br>it all to be done in memory without messing with temporary files or calling<br>gdal_warp externally.<br><font color="#888888">--<br>View this message in context: <a href="http://n2.nabble.com/Warping-a-warped-file-C--bindings-tp3003215p3003215.html" target="_blank" rel="nofollow">http://n2.nabble.com/Warping-a-warped-file-C--bindings-tp3003215p3003215.html</a><br>
Sent from the GDAL - Dev mailing list archive at Nabble.com.<br><br>_______________________________________________<br>gdal-dev mailing list<br><a href="http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3014818&i=1" target="_blank" rel="nofollow">gdal-dev@...</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank" rel="nofollow">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br></font></blockquote></div><br><br>_______________________________________________ <br>
gdal-dev mailing list <br><a href="http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3014818&i=2" target="_blank" rel="nofollow">gdal-dev@...</a> <br><a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank" rel="nofollow">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a> </blockquote></div><br>
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