<HTML>
<HEAD>
<TITLE>Re: [Gdal-dev] decimal degrees coordinates don't match degrees minutes seconds coordinates</TITLE>
</HEAD>
<BODY>
<FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:12.0px'>John -<BR>
<BR>
Where are you seeing decimal degrees? The first corner coordinate is:<BR>
<BR>
Upper Left ( 742500.000, 4275000.000) ( 90d12' 56.63"W, 38d35'25.40"N)<BR>
<BR>
Which is telling you the corner coordinates in the image’s native projection (UTM Zone 15N) in the first pair (742500.000, 4275000.000) and then giving you that point in degrees/minutes/seconds. There are no decimal degrees displayed.<BR>
<BR>
A rectangle in UTM space/coordinates is not a rectangle in lat/lon coordinates, so the upper left latitude and the upper right latitude should not be expected to be the same.<BR>
<BR>
- Ed<BR>
<BR>
-- <BR>
Ed McNierney<BR>
President and Chief Mapmaker<BR>
Maps a la carte, Inc. / TopoZone.com<BR>
73 Princeton Street, Suite 305<BR>
North Chelmsford, MA 01863<BR>
Phone: (978) 251-4242<BR>
Fax: (978) 251-1396<BR>
ed@topozone.com<BR>
<BR>
<HR ALIGN=CENTER SIZE="3" WIDTH="95%"><B>From: </B>John Mitchell <mitchelljj98@gmail.com><BR>
<B>Date: </B>Tue, 30 Jan 2007 15:14:36 -0500<BR>
<B>To: </B>Gdal-Dev <gdal-dev@lists.maptools.org><BR>
<B>Cc: </B><mitchelljj98@gmail.com><BR>
<B>Subject: </B>[Gdal-dev] decimal degrees coordinates don't match degrees minutes seconds coordinates<BR>
<BR>
Within gdalinfo I noticed that the decimal degrees corner coordinates are rectangular but to the right the degrees minutes seconds corner coordinates are not rectangular.<BR>
<BR>
Below is a gdalinfo dump:<BR>
<BR>
Driver: GTiff/GeoTIFF <BR>
Size is 10000, 10000<BR>
Coordinate System is:<BR>
PROJCS["NAD83 / UTM zone 15N",<BR>
GEOGCS["NAD83",<BR>
DATUM["North_American_Datum_1983",<BR>
SPHEROID["GRS 1980",6378137, 298.2572221010002,<BR>
AUTHORITY["EPSG","7019"]],<BR>
AUTHORITY["EPSG","6269"]],<BR>
PRIMEM["Greenwich",0],<BR>
UNIT["degree", 0.0174532925199433],<BR>
AUTHORITY["EPSG","4269"]],<BR>
PROJECTION["Transverse_Mercator"],<BR>
PARAMETER["latitude_of_origin",0],<BR>
PARAMETER["central_meridian",-93], <BR>
PARAMETER["scale_factor",0.9996],<BR>
PARAMETER["false_easting",500000],<BR>
PARAMETER["false_northing",0],<BR>
UNIT["metre",1,<BR>
AUTHORITY["EPSG","9001"]], <BR>
AUTHORITY["EPSG","26915"]]<BR>
Origin = (742500.000000000000000,4275000.000000000000000)<BR>
Pixel Size = (0.150000000000000,-0.150000000000000)<BR>
Metadata:<BR>
AREA_OR_POINT=Area<BR>
TIFFTAG_SOFTWARE=Adobe Photoshop CS Windows <BR>
TIFFTAG_DATETIME=2005:12:29 11:49:37<BR>
TIFFTAG_XRESOLUTION=72<BR>
TIFFTAG_YRESOLUTION=72<BR>
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)<BR>
Corner Coordinates:<BR>
Upper Left ( 742500.000, 4275000.000) ( 90d12' 56.63"W, 38d35'25.40"N)<BR>
Lower Left ( 742500.000, 4273500.000) ( 90d12'58.51"W, 38d34'36.79"N)<BR>
Upper Right ( 744000.000, 4275000.000) ( 90d11'54.70"W, 38d35'23.92"N) <BR>
Lower Right ( 744000.000, 4273500.000) ( 90d11'56.59"W, 38d34'35.31"N)<BR>
Center ( 743250.000, 4274250.000) ( 90d12'26.61"W, 38d35'0.36"N)<BR>
Band 1 Block=10000x5 Type=Byte, ColorInterp=Red <BR>
Band 2 Block=10000x5 Type=Byte, ColorInterp=Green<BR>
Band 3 Block=10000x5 Type=Byte, ColorInterp=Blue<BR>
<BR>
<BR>
-- <BR>
John J. Mitchell<BR>
<HR ALIGN=CENTER SIZE="3" WIDTH="95%"></SPAN></FONT><FONT SIZE="2"><FONT FACE="Monaco, Courier New"><SPAN STYLE='font-size:10.0px'>_______________________________________________<BR>
Gdal-dev mailing list<BR>
Gdal-dev@lists.maptools.org<BR>
<a href="http://lists.maptools.org/mailman/listinfo/gdal-dev">http://lists.maptools.org/mailman/listinfo/gdal-dev</a><BR>
</SPAN></FONT></FONT>
</BODY>
</HTML>