Re: [gdal-dev] GDALGetProjectionRef(...) problem on filetype JPEG and BMP
ivan.lucena at pmldnet.com
Thu Sep 17 08:21:57 EDT 2009
There is nothing wrong with that. If you gdal_translate a TIF to BMP the projection/reference will be stored on a
.bmp.aux.xml. The question is, why in the process of creating those BMP and JPG the auxiliary files are not been
> -------Original Message-------
> From: alex <sharukan at mail.ru>
> Subject: [gdal-dev] GDALGetProjectionRef(...) problem on filetype JPEG and BMP
> Sent: Sep 17 '09 06:44
> Good day.
> I encountered the following problem using GDAL. GDALGetProjectionRef(...) works with file formats TIF, but
JPG and BMP returns an empty string.
> Used as:
> There have been downloaded sources from http://download.osgeo.org/gdal/gdal162.zip
> Sources was built using Visual Studio 2005, the utility nmake, using the command line interface.
> Then was opened raster map file with format MapInfo by my program. MapInfo file was created by using the
export map function of the MapInfo program.
> I used the C API library GDAL. In the body of the program:
> GDALDatasetH pDataset = GDALOpen("map_filename", GA_ReadOnly);
> GDALGetGeoTransform(...) and GDALRasterIO(...)
> Then I opened the map file and exported part of it to coordinatesof I needed.
> It worked with the map file format map_filename.tif + map_filename.tab, map_filename.jpg +
map_filename.tab,map_filename.bmp + map_filename.tab.
> Then I could to get access to the map coordinates in the format .TIF using the function:
> which returned the projection maps of the form <wkt format projection string>, as was intended.
> But when opening files type .JPG and .BMP
> GDALGetProjectionRef (pDataset)
> returns an empty string "".
> I think that the library is somehow obtains a coordinate system maps, because
> GDALGetGeoTransform (...) work.
> Please specify how i can get a system of map coordinates for these files are JPG and BMP and import it into an
object of class OGRSpatialReference.
> I apologize for my poor language skills.
> Thank you.
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