<html><head></head><body><div class="ydp7aa00d4dyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div></div>
<div dir="ltr" data-setdir="false">Can someone unsubscribe me from this please?</div><div><br></div>
<div id="ydp7aa00d4dyahoo_quoted_8367006825" class="ydp7aa00d4dyahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;">
<div>
On Thursday, September 28, 2017 at 03:26:01 PM EDT, Even Rouault <even.rouault@spatialys.com> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="ydp7aa00d4dyiv0341751017"><div>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">On jeudi 28 septembre 2017 17:26:52 CEST Agram, Piyush S (334D) wrote:</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> Hi Even,</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> I think I have figured out how the GeoLocTransformer works. Dumped out</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> the backmap and might have some changes.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> 1) Rounding up to the nearest integer is definitely the issue here.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> 2) I’m going to try this first – maybe a weighted approach will be</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> better. For now, if a pixel falls in the middle of square – I’m going to</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> add it to all of the 4 vertices. Then average all the data that went into a</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> pixel of the backmap.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">Perhaps bilinear resampling so that the weights are proportionnal ?</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> 3) For the regular grid tests, if this shows improvement (hopefully) –</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> I can share the implementation and we can possibly discuss about adding a</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> weighting scheme. I don’t want to increase the runtime too much by adding</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">> complexity.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">I think (sub-pixel) accuracy is more important than speed. Speed improvements can be investigated later if needed.</p>
<div id="ydp7aa00d4dyiv0341751017yqtfd69457" class="ydp7aa00d4dyiv0341751017yqt8717050262"><p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">-- </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">Spatialys - Geospatial professional services</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px;">http://www.spatialys.com</p></div></div></div>_______________________________________________<br>gdal-dev mailing list<br><a href="mailto:gdal-dev@lists.osgeo.org" rel="nofollow" target="_blank">gdal-dev@lists.osgeo.org</a><br><a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" rel="nofollow" target="_blank">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a></div>
</div>
</div></div></body></html>