<div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div>Hi Luca,<br></div>actually, the coefficients of a world file aren't simply pixel size and rotation. Therefore, with a rotation in the mix, you may need to do some math :(<br></div>You may want to take a look a the world file definitions to see what these 6 coeffs represent:<br><a href="https://en.wikipedia.org/wiki/World_file">https://en.wikipedia.org/wiki/World_file</a></div><div dir="ltr"><br></div><div>I never had to deal with such cases so I can't provide you additional information.<br></div><div>However, looks like someone else already faced that problem:</div><div><a href="https://gis.stackexchange.com/questions/12181/how-to-generate-a-world-file-with-rotation">https://gis.stackexchange.com/questions/12181/how-to-generate-a-world-file-with-rotation</a></div><div><br></div><div>Hope this provides you some hint to solve the problem.</div><div>Regards,</div><div>Daniele<br></div><div><br></div><div> <br></div><div dir="ltr"><br></div><div dir="ltr"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Oct 2, 2018 at 1:37 PM Luca Delucchi <<a href="mailto:lucadeluge@gmail.com">lucadeluge@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
I need to use the coordinates information contained in a kml file to<br>
write a wld file.<br>
<br>
In the KML I have<br>
<br>
<LatLonBox><br>
<north>47.551729</north><br>
<south>45.438335</south><br>
<east>12.736706</east><br>
<west>9.670600</west><br>
<rotation>-1.35</rotation><br>
</LatLonBox><br>
<br>
I converted them to UTM WGS84 32N coordinate system<br>
<br>
<LatLonBox><br>
<north>5273247.79</north><br>
<south>5031864.43</south><br>
<east>781130.01</east><br>
<west>552448.98</west><br>
<rotation>-1.35</rotation><br>
</LatLonBox><br>
<br>
I calculated the resolution doing the differences between north/south<br>
and east/west and I get 251.441 and 238. To have squared pixel I would<br>
set to 250 (maybe it could be better to use 240?).<br>
<br>
with this info I created the wld file<br>
<br>
250<br>
-1.35<br>
-1.35<br>
250<br>
552448.98<br>
5273247.79<br>
<br>
The reprojection works quite well, but it seems shifted by some<br>
pixels, does the procedure make sense or is completely wrong?<br>
<br>
PS<br>
With latlong values the image is located in a wrong place, but the wld<br>
seems correct, maybe the pixel value is wrong.<br>
<br>
0.002201452083<br>
-1.35<br>
-1.35<br>
-0.002201452083<br>
9.670600<br>
47.551729<br>
<br>
<br>
-- <br>
ciao<br>
Luca<br>
<br>
<a href="http://www.lucadelu.org" rel="noreferrer" target="_blank">www.lucadelu.org</a><br>
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