<meta http-equiv="content-type" content="text/html; charset=utf-8"><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13.2px; border-collapse: collapse; ">Hi, all - I need 4-point (GCP) projective warping (<a href="http://docs.bentley.com/en/I-RASB/irasbhelp171.html" target="_blank" style="color: rgb(0, 101, 204); ">http://docs.bentley.com/en/I-RASB/irasbhelp171.html</a>) for my very basic rubbersheeting app at <a href="http://cartagen.org/maps" target="_blank" style="color: rgb(0, 101, 204); ">http://cartagen.org/maps</a> (getting full-res TMS output working). These are for aerial photographs, not scanned images.<div>
<br></div><div>After banging my head against a wall for a while I'm doing it in ImageMagick then gdal_translate then gdalwarp to get a geotiff. This is a bit inefficient. Is there just no major need for a projective warp in gdalwarp, or has nobody ever asked? </div>
<div><br></div><div>ImageMagick refers to it as a perspective distort and it is sadly computationally more demanding, but does not compromise GCP positioning to find a fit given 4 corners, as does the polynomial warping. Unless I'm missing something.</div>
<div><br></div><div>Suggestions, or am I pretty much on track? </div><div>Jeff</div></span>