<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt">Hi:<br><br>I need to create a tileindex of several non-rectangular raster images. I tried GdaltIndex, but produces rectangular polygons including the non-data (Null) pixels. <br>These images i have are Landsat 7 saved as *.img, *.tiff, *.Sid. <br>These images are rhomboidal. Since the file is rectangular there is an area with no valid pixels (non-data or Null). I need a boundary polygon that exclude this pixels. <br><br>I found an arcview 3x extension named <a href="http://arcscripts.esri.com/details.asp?dbid=12368">Grid to Valid-pixel Polygon Catalog w Stats</a>, that creates a boundary polygons of the valid pixels, but works just with Grid images. I could change the format of my images but this is very very time consuming. <br><br> Is there any script to create irregular bounding
polygons (non-rectangular) from the valid pixels for several images?<br><br>Best regards<br><br>Victor<br></div><br>
<hr size=1><br><font face="Verdana" size="-2">Enviado desde <a href="http://us.rd.yahoo.com/mailuk/taglines/isp/control/*http://us.rd.yahoo.com/evt=52431/*http://es.docs.yahoo.com/mail/overview/index.html">Correo Yahoo!</a><br>La bandeja de entrada más inteligente.<br></font></body></html>