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<p class=MsoNormal><font size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:
11.0pt;font-family:Arial;color:navy'>Hello everyone,</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'>Is there any way to escape from recurring 'Matrix
Inversion Errors' when using photo.2target in i.ortho.photo? The GRASS
manual entry for photo.2target mentions running photo.init as a remedy for this
error, however I've done this already entering in as much information as
I could from the flight report for my air photo. I've tried creating a
new image group, and re-running all the steps in i.ortho.photo, only to have it
crash on a matrix inversion error on step 7, after about 12 control points get
entered.</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'>I've entered in values for the
Initial Camera Exposure X,Y,Z coordinates, as well as estimates of the Omega,
Phi, and Kappa parameters (0.01 degrees each) in photo.init. I had no idea what
to enter for the 'A Priori Standard Deviations', so I've left
these all at 0. If I am working with a 1m resolution air photo, and a 1m res
DEM, what would be reasonable estimates for these standard deviations?</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'>Any help would be appreciated!</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'>Cheers,</span></font></p>
<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 </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>Canada</span></font></i></em><em><i><font size=2 color=navy
face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'> (</span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>Atlantic</span></font></i></em><em><i><font size=2 color=navy
face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'>)</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 </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>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
DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'>Dartmouth</span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>, </span></font></i></em><em><i><font size=2 color=navy
face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'>Nova
Scotia</span></font></i></em><em><i><font size=2 color=navy face=Arial><span
DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'>, </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>Canada</span></font></i></em><em><i><font size=2 color=navy
face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>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: </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>P.O. Box</span></font></i></em><em><i><font size=2 color=navy
face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;color:navy'> 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: </span></font></i></em><em><i><font
size=2 color=navy face=Arial><span DEFANGED_STYLE='font-size:10.0pt;font-family:Arial;
color:navy'>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 face=Arial><span
style='font-size:10.0pt;font-family:Arial;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>
<p class=MsoNormal><font size=3 face="Times New Roman"><span DEFANGED_STYLE='font-size:
12.0pt'> </span></font></p>
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