Hi,
I have a JP2 image whose extent is supposed to be from (0E deg , 0N deg) to (10E deg, 10N deg) but gdalinfo (from FWTools 2.4.7) is reporting extents that are off by 0.5 pixel north and west. The GML identifies the origin of the image as (0E deg, 10N deg). My understanding is that GDAL automatically adjusts to account for pixel center vs. pixel corner format differences and always reports pixel corners. What I'm not sure of is whether GML thinks the origin is centered on the top left pixel or at the top left corner of the top left pixel. Can someone tell me whether I need to submit a bug against: 1) GDAL 2) JP2 writer 3) Me Thanks, Scott Driver: JP2ECW/ERMapper JPEG2000 Files: e:\TestData\junk.jp2 Size is 256, 256 Coordinate System is: GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.01745329251994328, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4326"], AXIS["Latitude",NORTH], AXIS["Longitude",EAST]] GeoTransform = 10.01953125, 0, -0.0390625 -0.01953125, 0.0390625, 0 Corner Coordinates: Upper Left ( 10.0195313, -0.0195313) ( 10d 1'10.31"E, 0d 1'10.31"S) Lower Left ( 0.0195313, -0.0195313) ( 0d 1'10.31"E, 0d 1'10.31"S) Upper Right ( 10.0195313, 9.9804688) ( 10d 1'10.31"E, 9d58'49.69"N) Lower Right ( 0.0195313, 9.9804688) ( 0d 1'10.31"E, 9d58'49.69"N) Center ( 5.0195313, 4.9804688) ( 5d 1'10.31"E, 4d58'49.69"N) Band 1 Block=256x1 Type=Byte, ColorInterp=Red Overviews: arbitrary Band 2 Block=256x1 Type=Byte, ColorInterp=Green Overviews: arbitrary Band 3 Block=256x1 Type=Byte, ColorInterp=Blue Overviews: arbitrary Band 4 Block=256x1 Type=Byte, ColorInterp=Undefined Overviews: arbitrary The GML embedded in the file is <gml:FeatureCollection xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/gml http://www.math.ubc.ca/~burggraf/gml/gml4jp2.xsd"> <gml:boundedBy> <gml:Null>withheld</gml:Null> </gml:boundedBy> <gml:featureMember> <gml:RectifiedGridCoverage dimension="2" gml:id="RGC0001"> <gml:rectifiedGridDomain> <gml:RectifiedGrid dimension="2"> <gml:limits> <gml:GridEnvelope> <gml:low>0 0</gml:low> <gml:high>255 255</gml:high> </gml:GridEnvelope> </gml:limits> <gml:axisName>x</gml:axisName> <gml:axisName>y</gml:axisName> <gml:origin> <gml:Point gml:id="P0001" srsName="urn:ogc:def:crs:EPSG::4326"> <gml:pos>0.0000000000000 10.0000000000000</gml:pos> </gml:Point> </gml:origin> <gml:offsetVector srsName="urn:ogc:def:crs:EPSG::4326">0.0390625000000 -0.0000000000000</gml:offsetVector> <gml:offsetVector srsName="urn:ogc:def:crs:EPSG::4326">-0.0000000000000 -0.0390625000000</gml:offsetVector> </gml:RectifiedGrid> </gml:rectifiedGridDomain> </gml:RectifiedGridCoverage> </gml:featureMember> </gml:FeatureCollection>
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