I tested gdal_contour and it actually looks ok. I think I can use that as a pre process for mapserver. <div>My eye immediately fell on gdal_polygonize because I think that can create polygon shapefiles. I haven't got gdal_polygonize running yet because of some compatibility errors (gdal.Polygonize() not available) but will try to find that out.</div>
<div><br></div><div>Thanks for your help</div><div><br></div><div><br><br><div class="gmail_quote">2010/2/1 Frank Warmerdam [via OSGeo.org] <span dir="ltr"><<a href="http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4506967&i=0" target="_top" rel="nofollow">[hidden email]</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">
windfreak wrote:
<br>> I am wondering if it's possible to present isolines from raster data. I have
<br>> NETCDF/GRIB/HDF5 data and want to plot lines. Until now I haven't found any
<br>> examples like that.
<br>>
<br>> If it's not possible, I think the best workaround is to create an
<br>> application that generates shapefiles from raster data. Then I can use these
<br>> shapefiles to plot lines with mapserver. Do you have suggestions for better
<br>> workarounds?
<br><br></div><div class="im">Windfreak,
<br><br>MapServer does not support computing isolines on the fly, though you might
<br>get a vaguely similar effect by defining a class for each iso level with
<br>different colors.
<br><br>You can use the GDAL/OGR gdal_contour utility to produce iso-contours from
<br>a raster file. Be aware that it produces very fine isolines with one segment
<br>for each pixel crossed so some simplification might be appropriate before
<br>using the results for map rendering.
<br><br>Best regards,
<br>--
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