<html>
<head>
<DEFANGED_META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=US-ASCII">
<DEFANGED_meta name=Generator content="Microsoft Word 10 (filtered)">
<title>Re: [GRASSLIST:4352] Matrix Inversion Error when running photo.2target
in i.ortho.phot o - 2nd attempt</title>
<!-- <DEFANGED_STYLE>
<!--
/* Font Definitions */
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:blue;
text-decoration:underline;}
span.EmailStyle17
{font-family:Arial;
color:navy;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
--> </DEFANGED_STYLE>
</head>
<body lang=EN-US link=blue vlink=blue>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'>Thanks, Michael. I am using Grass 5.3 on a
Linux box. I do have Grass 5.7 installed on another PC using Cygwin, and
perhaps I should try the rectification there.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'>I'll give it a go and post my
results on the list.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'>Thanks for your reply!</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
10.0pt;font-family:Arial;color:navy'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><strong><b><font size=3 color=navy face=Arial><span
style='font-size:12.0pt;font-family:Arial;color:navy'>Eric Patton</span></font></b></strong></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Technologist, Geo-Spatial
Data Services</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Geological Survey of
Canada (Atlantic)</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Natural Resources Canada</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Bedford Institute of
Oceanography</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Dartmouth, Nova Scotia,
Canada B2Y 4A2</span></font></i></em></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Postal address: P.O. Box
1006</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Courier address: 1
Challenger Drive</span></font></i></em></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Telephone: (902)426-7732</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Facsimile: (902)426-4104</span></font></i></em></p>
<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>E-mail:
</span></font></i></em><font color=navy><span DEFANGED_STYLE='color:navy'><a
href="mailto:epatton@NRCan.gc.ca"><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;text-decoration:none'>epatton@NRCan.gc.ca</span></font></i></em></a></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
</div>
<p class=MsoNormal DEFANGED_STYLE='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span DEFANGED_STYLE='font-weight:bold'>From:</span></b> Michael Barton
[mailto:michael.barton@asu.edu] <br>
<b><span DEFANGED_STYLE='font-weight:bold'>Sent:</span></b> Thursday, September 16, 2004
3:26 AM<br>
<b><span DEFANGED_STYLE='font-weight:bold'>To:</span></b> </span></font><font size=2
face=Tahoma><span DEFANGED_STYLE='font-size:10.0pt;font-family:Tahoma'>Patton, Eric</span></font><font
size=2 face=Tahoma><span DEFANGED_STYLE='font-size:10.0pt;font-family:Tahoma'><br>
<b><span DEFANGED_STYLE='font-weight:bold'>Subject:</span></b> Re: [GRASSLIST:4352]
Matrix Inversion Error when running photo.2target in i.ortho.phot o - 2nd
attempt</span></font></p>
<p class=MsoNormal DEFANGED_STYLE='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal DEFANGED_STYLE='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=1 face=Verdana><span DEFANGED_STYLE='font-size:9.0pt;font-family:Verdana'>Eric,<br>
<br>
I don't know what is causing your problem. Which version of GRASS are
your running? Improvements to GRASS 5.7 are happening very quickly. Many of the
main GRASS programmers are at a GRASS/FOSS conference in Japan this past week
and only semi in touch. Probably Markus Neteler would be the best person as he
is currently working on orthophoto rectification. I know HE is in
Japan-giving a paper on orthophoto rectification in fact. If no one gets
back to you, you might try to post your query again in a week.<br>
<br>
Michael Barton<br>
<br>
<br>
On 9/15/04 9:21 AM, "Patton, Eric" <epatton@nrcan.gc.ca> wrote:</span></font></p>
<p class=MsoNormal DEFANGED_STYLE='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3 face="Times New Roman"><span DEFANGED_STYLE='font-size:12.0pt'>Hi,<br>
<br>
I had posted a message regarding matrix inversion errors encountered when using
photo.2target in i.ortho.photo a couple weeks ago, with no response. I was
wondering if anyone could help me with this problem, as the project I am
working on centers on being able to orthorectify aerial photographs as a part
of a coastline erosion analysis program I'm a part of.<br>
<br>
I am able to get 6/7ths of the way through i.ortho.photo, with the matrix
inversion error being encountered during the photo.2target phase of the
rectification. I've tried running photo.init, as the manual page suggests, but
this doesn't make any difference, the matrix inversion error always repeats
itself. Even if I create a brand new imagery group, and re-start the whole
process from scratch, I still encounter the inversion error problem. <br>
<br>
Is there any workaround for this problem? I really need to be able to create a
true orthophoto from GRASS, as the rms errors I get when rectifying in ArcView
8.3 are too high for my analysis!<br>
<br>
Any help would be greatly appreciated!!<br>
<br>
Thanks,<br>
<br>
Eric<br>
<br>
<br>
</span></font></p>
</div>
</body>
</html>