Hi Kris- You wouldn't by any chance have opened these geotiffs in ERDAS Imagine have you? Are there .aux or .rrd files associated with these images?
Thanks, Amanda Amanda M. Henneke When One tugs at a single thing in Nature, he finds it attached to the rest of the world. -John Muir Please consider the environment before printing this e-mail. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Kris Pribadi Sent: Tuesday, October 20, 2009 1:19 PM To: [email protected] Subject: [gdal-dev] ECW projection data using Dataset.GetProjectionRef() Hi: I am a new GDAL user using C#. I am using C# implementation of GDAL from FW_Tools. I am trying to write a C# program similar to gdalinfo to extract the metadata from raster files. It is working fine with GeoTiff files, but having problem reading ECW metadata file. The spatial projection "_projectionWKT" info returns "null". However, when I use gdalinfo, it prints out the ECW file coordinate system as WGS_84, which is correct. Does gdalinfo assume "WGS_84" if GetProjectionRef() is null? How does it get the projection info from ECW file? I appreciate any help or suggestions. Thanks Kris This is the fields definition: OSGeo.GDAL.Dataset _ds; SpatialReference _srs; SpatialProjectionInfo _projectionInfo; This is my program: OSGeo.GDAL.Gdal.AllRegister(); //Register drivers. OSGeo.OGR.Ogr.RegisterAll(); _ds = OSGeo.GDAL.Gdal.Open(Filename, OSGeo.GDAL.Access.GA_ReadOnly); //Open dataset from files if (_ds == null) { throw new Exception("The files could not be loaded"); } //TODO May fail if wrong file type? _ds.GetGeoTransform(_dbGeoTrans); //TODO projectionWKT may be null if no info from the file. //THIS RETURNS NULL FOR "ECW" FILES _projectionWKT = _ds.GetProjectionRef(); Console.WriteLine("Projection WKT: " + _projectionWKT); //Get Spatial Information _projectionInfo = new SpatialProjectionInfo(projectionWKT); bool _IsGeopgraphic = _projectionInfo.IsGeographic; bool _IsProjected = _projectionInfo.IsProjected; _srs = _projectionInfo.SpatialReference;
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