Ok Folks<br><br>I am now ready to go home and have a sit down!!<br>I have re-classified the layer with a new class column and then ordered the shapefile by the most common classes..... <br><br>the results are in......<br><br>
<3.5 secs for the entire layer to draw!! (only a saving of 21secs +) - the main saving was by just reclassifying.<br><br>Thanks to all as this has been a great learning experience, I am now going to see if I can find a bigger model grid to play with.....! ;o)<br>
<br>Chris<br><br><div class="gmail_quote">On 3 September 2010 11:07, thomas bonfort <span dir="ltr"><<a href="mailto:thomas.bonfort@gmail.com">thomas.bonfort@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
That would be the fastest yes. Even more so if you order the classes<br>
inside your layer by order of occurences, i.e. the most common classes<br>
first, and the least common ones last.<br>
<br>
--<br>
thomas<br>
<div><div></div><div class="h5"><br>
On Fri, Sep 3, 2010 at 11:54, Chris Jackson <<a href="mailto:webturtles@gmail.com">webturtles@gmail.com</a>> wrote:<br>
> Jukka<br>
><br>
> Thank you for the code I will give it a go. I guess I will dust off the<br>
> field calculator in ArcMap and see if that improves things somewhat, I guess<br>
> that is a similar overhead when classifying a raster by pixel value (not<br>
> sure how to fix that). So if I understand you right then I would just use a<br>
> number per class (1-15 say) in the new attribute field and then code<br>
> something like:<br>
><br>
> CLASSITEM "MEAN_SP_PC"<br>
> CLASS<br>
> EXPRESSION "1"<br>
> NAME "> 4.00 (m/s)"<br>
> STYLE<br>
> COLOR 135 99 64<br>
> END<br>
> END<br>
><br>
> Thanks again for the insight.<br>
> Chris<br>
><br>
><br>
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