Chris,<br><br>GDAL is using the GCPs for location information.<br><br><div class="gmail_quote">On Thu, Apr 7, 2011 at 4:08 PM, Goo Creations <span dir="ltr"><<a href="mailto:goocreations@gmail.com">goocreations@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Yes, here it is:<br><br><br><br>Size is 8415, 1368<br>Coordinate System is `'<br>GCP Projection = <br>
GEOGCS["WGS 84",<br> DATUM["WGS_1984",<br> SPHEROID["WGS 84",6378137,298.257223563,<br>
AUTHORITY["EPSG","7030"]],<br> AUTHORITY["EPSG","6326"]],<br> PRIMEM["Greenwich",0],<br> UNIT["degree",0.0174532925199433],<br> AUTHORITY["EPSG","4326"]]<br>
GCP[ 0]: Id=1, Info=<br> (1,1) -> (1.09027789320281,36.5294598527946,0)<br>GCP[ 1]: Id=2, Info=<br> (8415,1) -> (1.69376245781042,36.497946615707,0)<br>GCP[ 2]: Id=3, Info=<br> (8415,1368) -> (1.68268551099186,36.5851791048298,0)<br>
GCP[ 3]: Id=4, Info=<br> (1,1368) -> (1.06532262333098,36.6082043228718,0)<br>Metadata:<br> TIFFTAG_DATETIME=2010:10:05 06:46:58<br> AREA_OR_POINT=Point<br>Image Structure Metadata:<br> INTERLEAVE=BAND<br>
Corner Coordinates:<br>Upper Left ( 0.0, 0.0)<br>Lower Left ( 0.0, 1368.0)<br>Upper Right ( 8415.0, 0.0)<br>Lower Right ( 8415.0, 1368.0)<br>Center ( 4207.5, 684.0)<br>Band 1 Block=8415x128 Type=UInt16, ColorInterp=Gray<div>
<div></div><div class="h5"><br>
<br><br><br><br><br><br><br><div class="gmail_quote">On Thu, Apr 7, 2011 at 11:51 AM, Chaitanya kumar CH <span dir="ltr"><<a href="http://chaitanya.ch" target="_blank">chaitanya.ch</a>@<a href="http://gmail.com" target="_blank">gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Chris,<br><br>Can you provide the gdalinfo output of the geotiff?<div><div></div><div>
<br><br><div class="gmail_quote">On Thu, Apr 7, 2011 at 2:29 PM, Goo Creations <span dir="ltr"><<a href="mailto:goocreations@gmail.com" target="_blank">goocreations@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I've worked through some QGis code and noticed that if this happens, GDALAutoCreateWarpedVRT is called on the image to create a copy. So GDALAutoCreateWarpedVRT somehow retrieves some sort of metadata to accomplish this.<div>
<div></div><div><br>
<br><br><br><div class="gmail_quote">On Thu, Apr 7, 2011 at 10:44 AM, Goo Creations <span dir="ltr"><<a href="mailto:goocreations@gmail.com" target="_blank">goocreations@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
A couple of different apps, such as QGis and Monteverdi (who rotated the image). If I view the image in a normal image viewer (or application not built on top of GDAL, the image is not rotated). Hence there must be some metadata from GDAL these applications use to rotate the image.<br>
<br>And yes, I can read other metadata.<br><br>Chris<div><div></div><div><br><br><br><br><div class="gmail_quote">On Thu, Apr 7, 2011 at 10:34 AM, Chaitanya kumar CH <span dir="ltr"><<a href="http://chaitanya.ch" target="_blank">chaitanya.ch</a>@<a href="http://gmail.com" target="_blank">gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Chris,<br><br>What did you use to view the image? Were you able to read any other Geo related data with that?<br>
<br><div class="gmail_quote"><div><div></div><div>On Thu, Apr 7, 2011 at 1:56 PM, Goo Creations <span dir="ltr"><<a href="mailto:goocreations@gmail.com" target="_blank">goocreations@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div>Hi all<br><br>I tried to read the transformation coefficients by using GDALDataset::GetGeoTransform. This function however returned CE_Failure, so i assume that the values are not stored in the metadat.<br>
When I view the image, the image is rotated. There is no world file or anything that could cause the rotation.<br>
<br>So my question: If these values are not stored in the metadata, how does GDAL handle the rotation, pixel size, etc?<br><br>Chris<br><br>
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Chaitanya kumar CH.<br>
/tʃaɪθənjə/ /kʊmɑr/ <br><a href="tel:%2B91-9494447584" value="+919494447584" target="_blank">+91-9494447584</a><br>17.2416N 80.1426E<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br><a href="tel:%2B91-9494447584" value="+919494447584" target="_blank">+91-9494447584</a><br>17.2416N 80.1426E<br>
</div></div></blockquote></div><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9494447584<br>17.2416N 80.1426E<br>