<div dir="ltr"><div class="gmail_quote"><div dir="ltr">Probably my SRS was wrong, my historical maps are in EPSG:3819, but I needed to convert this coordinates to EPSG:23700, wich has wrong parameters in open source softwares (I have to add to the proj.4 format of EPSG:23700 the following towgs parameter: '<span style="color:rgb(34, 34, 34);line-height:18px"><span style="font-family:FreeSans, sans-serif;white-space:pre-wrap">+towgs84=52.684,-71.194,-13.975,-0.312,-0.1063,-0.3729,1.0191') and my maps longitude counts from El-Hierro (not from Greenwich).</span></span><div>
<font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap"><br></span></font></div><div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap">After the transforming process, I had to cut off the frame of the maps. When I tried to figure out how to do this, I released the geotransform starting point is far away from the real starting point (in qgis).</span></font></div>
<div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap"><br></span></font></div><div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap">Now I am on holyday, but the next week I think, I can reproduce this error. </span></font></div>
<div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap"><br></span></font></div><div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap">Best regards,</span></font></div>
<div><font color="#222222" face="FreeSans, sans-serif"><span style="line-height:18px;white-space:pre-wrap">Balazs <br></span></font><div><div></div><div class="h5"><div><span style="color:rgb(34, 34, 34);line-height:18px"><span style="font-family:FreeSans, sans-serif;white-space:pre-wrap"><br>
</span></span><br><div class="gmail_quote">2011/8/9 Vadim Shlyakhov <span dir="ltr"><<a href="mailto:vadp.devl@gmail.com" target="_blank">vadp.devl@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>On Mon, Aug 8, 2011 at 6:42 PM, Balazs Szabó <<a href="mailto:szabobaa@gmail.com" target="_blank">szabobaa@gmail.com</a>> wrote:<br>
<br>
> I tried the .GCPsToGeoTransform() method, and it is ok, but in the<br>
> geotransform tuple (geotransform[0],geotransform[3] ) gave me fake starting<br>
> point.<br>
<br>
</div>Frankly speaking, this is a bit strange if your raster is linear and<br>
you have a proper set of GCPs and SRS. But it shouldn't matter if you<br>
are going to use GCP-based warp, so you could drop<br>
.GCPsToGeoTransform() altogether.<br>
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