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<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Hi All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>I’m new both to this mail-list and to GeoTIFF
too.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Nevertheless, I’m developing a Cad application
which allows the user to pick a desired number of points in a TIFF raster image
(thus the application retrieves their </span></font><font size=2 face=Verdana><span
lang=EN-GB style='font-size:10.0pt;font-family:Verdana'>raster coordinates) and
</span></font><font size=2 face=Verdana><span lang=EN-US style='font-size:10.0pt;
font-family:Verdana'>inputs their corresponding </span></font><font size=2
face=Verdana><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana'>model
coordinates. Then t</span></font><font size=2 face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana'>he application performs an affine
transformation between the two systems and calculates the 4 parameters: X
translation, Y translation, scaling factor, rotation angle.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>So my question is: how do I store this georeferencing
data into the original TIFF file so that it becomes a GeoTIFF file? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Looking at some documentation, it seems that ModelTransformationTag
would do the case, but unfortunately I could not find specification on how to transform
my (affine transformation) parameters into its arguments.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Another option for me could be to create a TFW
file, but also in this case I don’t understand how to convert my affine
transformation 4 parameters into the TFW values. Also, Cad software, such as
AutoCAD, seems to ignore the second and third lines of a TFW (X/Y rotation).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Any help to lead me in the right direction would be
greatly appreciated, thanks in advance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Gianni Rossi</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana'>Tecnobit S.r.l.</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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