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<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Duncan,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>both images in ArcMap located at the same upper-left
corner and rotated </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>around it about 45 degrees clockwise:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><A
title=blocked::ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak
href="ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak"><U
title=blocked::ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak><FONT
title=blocked::ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak><FONT
title=blocked::ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak
size=2><A
href="ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak/gok/gdal/AUV">ftp://aerometric-ak:amak2014@ftp.aerometric-ak.com/users/aerometric-ak</FONT></U></FONT></A><FONT
face="Courier New" color=#0000ff size=2>/gok/gdal/AUV</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Is it location you are expecting? Looks fine for
me.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Did mention that both images have 0
resolution:</FONT></SPAN></DIV><SPAN class=541272817-23072008><FONT
face="Courier New" color=#0000ff size=2></FONT><FONT face="Courier New"
color=#0000ff size=2></FONT>
<DIV dir=ltr align=left><BR><FONT face="Courier New" color=#0000ff size=2>Image
width=1360, length=1024 (1392640 pixels)<BR>resolution: 0.00/0.00
pixels/inch<BR>scan line
size =4080<BR>bits/sample =8<BR>photometric RGB color
model<BR>samples/pixel =3<BR>compression JPEG DCT
compression</FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff
size=2></FONT> </DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Somebody on dev list might give you more
insights.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff
size=2></FONT> </DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Happy programming!</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=541272817-23072008><FONT face="Courier New"
color=#0000ff size=2>Gennady</FONT></SPAN></DIV>
<DIV dir=ltr align=left></SPAN> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Duncan Mercer
[mailto:d.mercer@acfr.usyd.edu.au] <BR><B>Sent:</B> Tuesday, July 22, 2008 4:51
PM<BR><B>To:</B> geotiff@lists.maptools.org<BR><B>Subject:</B> [Geotiff] Geotiff
problem with "small" images???<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr>Hi <BR><BR>I'm new to the world of geotiff and I'm running<BR>into
a problem when generating small area coverage<BR>geotiffs<BR><BR>I'm collecting
images using a robotic submarine (an AUV)<BR>and want to use geotiff to locate
these images for use in a<BR>GIS etc. Typical footprint for the images is 1m x
1.5m<BR><BR>If I write the geotiff tags using the correct size then the<BR>image
appears badly distorted when viewed in openev and<BR>in arcgis. If however I
keep everything else the same and <BR>pretend that the image is 1Km x 1.5Km the
image will appear<BR>undistorted.<BR><BR>Has anyone come across this issue
before, is there some fundamental<BR>lower limit on the image size that I've not
picked up on? Or can someone<BR>tell me how to search the mailing list archives
for similar issues?<BR><BR>Example images are available at.<BR><A
href="http://www-personal.acfr.usyd.edu.au/d.mercer/geotiff">http://www-personal.acfr.usyd.edu.au/d.mercer/geotiff</A><BR>Large
image appears ok, but oversized. Small image is distorted<BR>(at least in
openev. I haven't been able to check this one in arcgis<BR>but I have seen the
issue with other images I have generated in the
past)<BR><BR><BR><BR><BR>FYI.<BR>I am using libgeotiff and writing the following
geotags...<BR><BR> TIFFSetField(tif_ptr, TIFFTAG_GEOTRANSMATRIX, 16,
position.transform); <BR><BR> GTIFKeySet(gtif_ptr, GTModelTypeGeoKey,
TYPE_SHORT, 1, ModelTypeProjected);<BR> GTIFKeySet(gtif_ptr,
GTRasterTypeGeoKey, TYPE_SHORT, 1, RasterPixelIsArea);<BR> <BR>
GTIFKeySet(gtif_ptr, ProjectedCSTypeGeoKey, TYPE_SHORT, 1, utm_zone);<BR>
GTIFKeySet(gtif_ptr, PCSCitationGeoKey, TYPE_ASCII, PCS_Zone.str().length(),
PCS_Zone.str().c_str());<BR><BR><BR>Any help or suggestions gratefully
received.<BR>Best regards<BR>Duncan<BR><BR><BR>-- <BR>Dr Duncan
Mercer<BR>Australian Centre for Field Robotics<BR>The Rose Street Building,
J04<BR>The University of Sydney.<BR>2006 NSW, Australia<BR>Tel: +61 (0) 2 9036
7178<BR>Fax: +61 (0) 2 9351 7474 </DIV></BODY></HTML>