[Mapserver-users] Display polygon layer as circle layer
Stefan Schwarzer
stefan.schwarzer at grid.unep.ch
Mon Jul 14 09:38:43 EDT 2003
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Dear all,
I have some (polygon) layers containing national statistics (for example
GDP or Population Density). They are nicely displayed in five categories,
represented by different colors. Now, I would like to place another,
geospatial (e.g. land cover, DEM) layer under it. I can change the
transparency of the statistical layer, but the result is not very nice. It
is too difficult to recognize the correct category, as the two layers are
becoming too blurry.
Now I thought perhaps it would be more meaningful if I would overlay the
geospatial/background image with a "circle-layer", instead of a
"polygon-layer". The size or the color of the circles would represent then
the value of the country. This would leave enough space to see the
background image, but one could still recognize the different categories of
the statistical layer.
Is there a simple way to accomplish this? Do I have to create from the
polygon shapefile a point shapefile on-the-fly, before then displaying the
latter?
Thanks for any help,
Stefan
_______________________________________
Stefan Schwarzer
Consultant on GEO
UNEP/DEWA/GRID-Geneva
Chemin des Anemones 11
CH - 1219 Chatelaine
Switzerland
Tel: (+41) 22.917.83.49
Fax: (+41) 22.917.80.29
Email: stefan.schwarzer at grid.unep.ch
Internet: http://geodata.grid.unep.ch/
_______________________________________
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Dear all,<br><br>
I have some (polygon) layers containing national statistics (for example
GDP or Population Density). They are nicely displayed in five categories,
represented by different colors. Now, I would like to place another,
geospatial (e.g. land cover, DEM) layer under it. I can change the
transparency of the statistical layer, but the result is not very nice.
It is too difficult to recognize the correct category, as the two layers
are becoming too blurry. <br><br>
Now I thought perhaps it would be more meaningful if I would overlay the
geospatial/background image with a "circle-layer", instead of a
"polygon-layer". The size or the color of the circles would
represent then the value of the country. This would leave enough space to
see the background image, but one could still recognize the different
categories of the statistical layer.<br><br>
Is there a simple way to accomplish this? Do I have to create from the
polygon shapefile a point shapefile on-the-fly, before then displaying
the latter?<br><br>
Thanks for any help,<br><br>
Stefan<br><br>
<br>
<x-sigsep><p></x-sigsep>
<font size=3><x-tab> </x-tab>_______________________________________<br><br>
</font><font size=2><x-tab> </x-tab><b>Stefan
Schwarzer<br>
</b><x-tab> </x-tab>Consultant
on GEO<br><br>
<x-tab> </x-tab>UNEP/DEWA/GRID-Geneva<br>
<x-tab> </x-tab>Chemin des
Anemones 11<br>
<x-tab> </x-tab>CH - 1219
Chatelaine<br>
<x-tab> </x-tab>Switzerland<br><br>
<x-tab> </x-tab>Tel: (+41)
22.917.83.49<br>
<x-tab> </x-tab>Fax: (+41)
22.917.80.29<br><br>
<x-tab> </x-tab>Email:
stefan.schwarzer at grid.unep.ch<br>
<x-tab> </x-tab>Internet:
<a href="http://geodata.grid.unep.ch/" eudora="autourl">http://geodata.grid.unep.ch/</a><br>
</font><font size=3><x-tab> </x-tab>_______________________________________</font></body>
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