<span id="result_box" class="" lang="en"><span class="hps">Hi,<br><br>Thanks for the suggestions</span><span>.</span> <span class="hps">I had to buffer the mask. After, I clipped the raster with the new mask. Worked for me</span></span>!<br>
<br>Thank you very much!<br><br><div class="gmail_quote">2012/11/22 Peter Halls <span dir="ltr"><<a href="mailto:p.halls@york.ac.uk" target="_blank">p.halls@york.ac.uk</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Alisson,<br><br> the advice I give my students in such a circumstance is to buffer the boundary by either one half of the pixel size or by the pixel size. This has the effect of increasing the mask to include all cells along the boundary and gain a closer equivalent of a vector clip.<br>
<br> For another discussion of the issues, see Burrough, P.A., and McDonnell, Rachael A., 1998, Principles of Geographic Information Systems, Oxford: OUP.<br><br>Best wishes,<br><br>Peter<div class="HOEnZb"><div class="h5">
<br><br><div class="gmail_quote">
On 22 November 2012 14:02, Joaquim Luis <span dir="ltr"><<a href="mailto:jluis@ualg.pt" target="_blank">jluis@ualg.pt</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Alisson,<br>
<br>
It's not so easy to follow what is "desired" and "not-desired". For
an excellent discussion of the details involved in such operations
see<br>
<br>
<a href="http://blogs.mathworks.com/steve/2006/12/22/poly2mask-and-roipoly-part-3/" target="_blank">http://blogs.mathworks.com/steve/2006/12/22/poly2mask-and-roipoly-part-3/</a><br>
<br>
As a solution for your 'wish-behavior' case maybe what you can do
is to previously expand your polygon with a buffer of half cell
width. <br>
<br>
Joaquim<br>
<br>
<blockquote type="cite">
<div>Hi friends,<br>
<br>
By using gdalwarp to clip a raster with a mask (shape), I get a
new raster of smaller size, which is the boundary of the polygon
shape (mask). However, the pixels do not pass the polygon. I
would like to pass the pixels just a little of the polygon mask.<br>
<br>
For clarity, I send two pictures of what I desire and not
desire:<br>
<a href="http://postimage.org/image/hlrc3911z/" target="_blank">http://postimage.org/image/hlrc3911z/</a>
<br>
<a href="http://postimage.org/image/4vn3q5t3r/" target="_blank">http://postimage.org/image/4vn3q5t3r/</a><br>
<br>
</div>
The used command is: gdalwarp -dstnodata 0 -q -cutline
C:/Users/Hugo/Final.shp -crop_to_cutline -of GTiff
C:/Users/Hugo/Elevation-DEM-CLIPPED.img
C:/Users/Hugo/Elevation-DEM-CLIPPED.img
<div class="gmail_quote">
<div>
<div><img src=""></div>
</div>
<div>
<br>
Can you help me?<br>
<br>
Best Regards,<br>
</div>
</div>
-- <br>
Alisson Barbosa
<div>Systems Analyst - FUNCEME
<div><span lang="en"><span title="Clique para mostrar traduções
alternativas">M.Sc. in Computer Science</span><span title="Clique para mostrar traduções alternativas"> - MACC</span></span>
<div>
<div>Graduate in Computer Science - UECE</div>
</div>
</div>
<br>
</div>
<br>
<br>
<fieldset></fieldset>
<br>
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----------------------------------------------------------------------------------------------------------------<br>
Peter J Halls, GIS Advisor & Team Leader Applications Support and Training, <br> Information Directorate, University of York<br>Telephone: 01904 323806 Fax: 01904 323740<br>Snail mail: Harry Fairhurst Building, University of York, <br>
Heslington, York YO10 5DD<br>This message has the status of a private and personal communication<br>----------------------------------------------------------------------------------------------------------------<br>
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<span lang="en"><span title="Clique para mostrar traduções alternativas">M.Sc. in Computer Science</span><span title="Clique para mostrar traduções alternativas"> - MACC</span></span><div><div>Graduate in Computer Science - UECE</div>
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