Chris, GDAL is using the GCPs for location information.
On Thu, Apr 7, 2011 at 4:08 PM, Goo Creations <[email protected]>wrote: > Yes, here it is: > > > > Size is 8415, 1368 > Coordinate System is `' > GCP Projection = > GEOGCS["WGS 84", > DATUM["WGS_1984", > SPHEROID["WGS 84",6378137,298.257223563, > AUTHORITY["EPSG","7030"]], > AUTHORITY["EPSG","6326"]], > PRIMEM["Greenwich",0], > UNIT["degree",0.0174532925199433], > AUTHORITY["EPSG","4326"]] > GCP[ 0]: Id=1, Info= > (1,1) -> (1.09027789320281,36.5294598527946,0) > GCP[ 1]: Id=2, Info= > (8415,1) -> (1.69376245781042,36.497946615707,0) > GCP[ 2]: Id=3, Info= > (8415,1368) -> (1.68268551099186,36.5851791048298,0) > GCP[ 3]: Id=4, Info= > (1,1368) -> (1.06532262333098,36.6082043228718,0) > Metadata: > TIFFTAG_DATETIME=2010:10:05 06:46:58 > AREA_OR_POINT=Point > Image Structure Metadata: > INTERLEAVE=BAND > Corner Coordinates: > Upper Left ( 0.0, 0.0) > Lower Left ( 0.0, 1368.0) > Upper Right ( 8415.0, 0.0) > Lower Right ( 8415.0, 1368.0) > Center ( 4207.5, 684.0) > Band 1 Block=8415x128 Type=UInt16, ColorInterp=Gray > > > > > > > > > On Thu, Apr 7, 2011 at 11:51 AM, Chaitanya kumar CH <chaitanya.ch@ > gmail.com> wrote: > >> Chris, >> >> Can you provide the gdalinfo output of the geotiff? >> >> >> On Thu, Apr 7, 2011 at 2:29 PM, Goo Creations <[email protected]>wrote: >> >>> 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. >>> >>> >>> >>> >>> On Thu, Apr 7, 2011 at 10:44 AM, Goo Creations >>> <[email protected]>wrote: >>> >>>> 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. >>>> >>>> And yes, I can read other metadata. >>>> >>>> Chris >>>> >>>> >>>> >>>> >>>> On Thu, Apr 7, 2011 at 10:34 AM, Chaitanya kumar CH <chaitanya.ch@ >>>> gmail.com> wrote: >>>> >>>>> Chris, >>>>> >>>>> What did you use to view the image? Were you able to read any other Geo >>>>> related data with that? >>>>> >>>>> On Thu, Apr 7, 2011 at 1:56 PM, Goo Creations >>>>> <[email protected]>wrote: >>>>> >>>>>> Hi all >>>>>> >>>>>> 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. >>>>>> When I view the image, the image is rotated. There is no world file or >>>>>> anything that could cause the rotation. >>>>>> >>>>>> So my question: If these values are not stored in the metadata, how >>>>>> does GDAL handle the rotation, pixel size, etc? >>>>>> >>>>>> Chris >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> gdal-dev mailing list >>>>>> [email protected] >>>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Best regards, >>>>> Chaitanya kumar CH. >>>>> /tʃaɪθənjə/ /kʊmɑr/ >>>>> +91-9494447584 >>>>> 17.2416N 80.1426E >>>>> >>>> >>>> >>> >> >> >> -- >> Best regards, >> Chaitanya kumar CH. >> /tʃaɪθənjə/ /kʊmɑr/ >> +91-9494447584 >> 17.2416N 80.1426E >> > > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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