<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.5730.11" name=GENERATOR></HEAD>
<BODY>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2>John -</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2>Alabama East SPCS as EPSG:26929 is in units of meters, but
your GeoTIFF seems to think it's in feet. This will cause the reprojection
to move the file 3 times further from the CS origin than you
think.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2>It seems like you have a "hybrid" GeoTIFF with one
projection definition and a different EPSG code.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2>The ESRI-defined code of 102629 is an Alabama East NAD83
Feet projection. The definition is:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007># NAD 1983 StatePlane
Alabama East FIPS 0101 Feet<BR><102629> +proj=tmerc +lat_0=30.5
+lon_0=-85.83333333333333 +k=0.999960 +x_0=200000 +y_0=0 +ellps=GRS80
+datum=NAD83 +to_meter=0.3048006096012192 no_defs <></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2>Which is identical to the 26929 definition except for the
"to_meter" parameter.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><FONT face=Arial
color=#0000ff size=2> - Ed</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=479120200-09022007><!-- Converted from text/plain format -->
<P><FONT size=2>Ed McNierney<BR>President and Chief Mapmaker<BR>TopoZone.com /
Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North Chelmsford,
MA 01863<BR>Phone: +1 (978) 251-4242<BR>Fax: +1 (978)
251-1396<BR>ed@topozone.com</FONT> </P></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> gdal-dev-bounces@lists.maptools.org
[mailto:gdal-dev-bounces@lists.maptools.org] <B>On Behalf Of </B>John
Mitchell<BR><B>Sent:</B> Thursday, February 08, 2007 6:38 PM<BR><B>To:</B>
MAPSERVER-USERS@lists.umn.edu; Gdal-Dev<BR><B>Cc:</B>
mitchelljj98@gmail.com<BR><B>Subject:</B> [Gdal-dev] Alabama geotiff tiles are
showing up in Virginia withinmapserver<BR></FONT><BR></DIV>
<DIV></DIV>Hi,<BR><BR>I have Alabama geotiff tiles which are showing up in
Virginia within mapserver. If you look at the original gdalinfo against
one of the tiles you will see that the corner coordinates are within Alabama,
but within MapServer if you do on the fly projection(EPSG:26929 to EPSG:4326) it
instead shows up within the state of Virginia. I also used gdalwarp to
change the projection from EPSG:26929 to EPSG:4326 and then displayed within
mapserver without having to reproject on the fly and it also shows up within
Virginia. Note: when running gdalinfo on the gdalwarp file which was reprojected
to EPSG:4326 it also has the coordinates within the state of Virginia.
<BR><BR>Below are the gdalinfo dumps first the original file and then the file
that was converted from EPSG:26929 to EPSG:4326<BR><BR>Driver:
GTiff/GeoTIFF<BR>Size is 10000, 10000<BR>Coordinate System is:<BR>PROJCS["NAD83
/ Alabama East", <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",30.5],<BR>
PARAMETER["central_meridian",-85.83333333333333],<BR>
PARAMETER["scale_factor",0.99996], <BR>
PARAMETER["false_easting",656166.6666666665],<BR>
PARAMETER["false_northing",0],<BR> UNIT["US survey
foot",0.3048006096012192,<BR>
AUTHORITY["EPSG","9003"]], <BR>
AUTHORITY["EPSG","26929"]]<BR>Origin =
(723240.000000000000000,820340.000000000000000)<BR>Pixel Size =
(0.500000000000000,-0.500000000000000)<BR>Metadata:<BR>
AREA_OR_POINT=Area<BR> TIFFTAG_XRESOLUTION=72 <BR>
TIFFTAG_YRESOLUTION=72<BR> TIFFTAG_RESOLUTIONUNIT=2
(pixels/inch)<BR>Corner Coordinates:<BR>Upper Left (
723240.000, 820340.000) ( 85d36'54.59"W, 32d45'17.80"N)<BR>Lower
Left ( 723240.000, 815340.000 ) ( 85d36'54.71"W,
32d44'28.33"N)<BR>Upper Right ( 728240.000, 820340.000) (
85d35'56.04"W, 32d45'17.69"N)<BR>Lower Right ( 728240.000,
815340.000) ( 85d35'56.17"W, 32d44'
28.22"N)<BR>Center ( 725740.000,
817840.000) ( 85d36'25.38"W, 32d44'53.01"N)<BR>Band 1 Block=10000x1 Type=Byte,
ColorInterp=Red<BR> Overviews: 1250x1250<BR>Band 2 Block=10000x1
Type=Byte, ColorInterp=Green <BR> Overviews: 1250x1250<BR>Band 3
Block=10000x1 Type=Byte, ColorInterp=Blue<BR> Overviews:
1250x1250<BR><BR>-------------------------------------------------------------------------------------------------------------------
<BR><BR>Driver: GTiff/GeoTIFF<BR>Size is 11930, 9476<BR>Coordinate System
is:<BR>GEOGCS["WGS 84",<BR>
DATUM["WGS_1984",<BR> SPHEROID["WGS
84",6378137,298.2572235630016,<BR>
AUTHORITY["EPSG","7030"]], <BR>
AUTHORITY["EPSG","6326"]],<BR>
PRIMEM["Greenwich",0],<BR>
UNIT["degree",0.0174532925199433],<BR>
AUTHORITY["EPSG","4326"]]<BR>Origin = (-79.902533251890048
,37.745881181682833)<BR>Pixel Size =
(0.000005030208747,-0.000005030208747)<BR>Metadata:<BR>
AREA_OR_POINT=Area<BR>Corner Coordinates:<BR>Upper Left (
-79.9025333, 37.7458812) ( 79d54'9.12"W, 37d44'45.17"N) <BR>Lower
Left ( -79.9025333, 37.6982149) ( 79d54'9.12"W,
37d41'53.57"N)<BR>Upper Right ( -79.8425229, 37.7458812) ( 79d50'33.08"W,
37d44'45.17"N)<BR>Lower Right ( -79.8425229, 37.6982149 ) ( 79d50'33.08"W,
37d41'53.57"N)<BR>Center ( -79.8725281,
37.7220481) ( 79d52'21.10"W, 37d43'19.37"N)<BR>Band 1 Block=256x256 Type=Byte,
ColorInterp=Red<BR>Band 2 Block=256x256 Type=Byte, ColorInterp=Green <BR>Band 3
Block=256x256 Type=Byte, ColorInterp=Blue<BR><BR clear=all><BR>-- <BR>John J.
Mitchell </BODY></HTML>