[Mapserver-users] variable (proportionately) sized point data

[Gerry Creager N5JXS]

Daryl Herzmann (http://mesonet.agron.iastate.edu/wms/comprad.php) and I 
get 'em from the same place, the Unidata LDM data feed.  We take the 
Level III (NIDS) data and create mosaics of all the appropriate radars 
for the regions we individually are concerned with.

The package we use to make the images, either a single radar site or a 
statewide mosaic, is calle GemPak, and it, as well, is the handywork of 
Unidata.  It'll produce a GIF, which I then transform into a png.  We've 
established the background color (I used gimp to determine the 
predominent color) and identified that as transparent in the mapfile.

For the PWV values, I have what amounts to a big if-then-else statement 
set defining the PWV point value colors.  The size is representative of 
the radius of the integrated column of atmosphere we can estimate water 
reasonalby well for, using the GPS technique.

Next question?

gerry

Tyler Mitchell wrote:
> Gerry, I'm also curious on what's going on in the backend - some neat 
> stuff at any rate.  Where do you get radar?
> 
> mapserver-users-admin at lists.gis.umn.edu wrote on 04/22/2004 02:04:56 AM:
> 
> 
>>Gerry,
>>
>>Gerry Creager N5JXS said:
>>
>>>Yes. Although I use the value to encode color on the site below, you
>>>could similarly encode a size for the point symbol.
>>>
>>>http://mesonet.tamu.edu/cgi-bin/mapserv?
>>
>>mode=browse&zoomdir=0&zoomsize=2&layer=weather-
>>pwv&imgxy=350+350&imgext=-106.800000+24.453029+-93.520000+37.
>>746971&map=%2Fvar%2Fwww%2Fmesonet%2Ftexas%2Fmesonet.
>>map&savequery=true&program=%2Fcgi-bin%2Fmapserv&map_web_imagepath=%
>>2Fvar%2Fwww%2Fmesonet%2Ftmp%2F&map_web_imageurl=%2Ftmp%2F
>>
>>Which technique / command did you use for this ?
>>
>>Moritz
>>
>>
>>
>>>Moritz Lennert wrote:
>>>
>>>>Hello,
>>>>
>>>>Can Mapserver display point data as point symbols that are 
> 
> proportionate
> 
>>>>to a given value for each point ?
>>>>
>>>>In other words, if I have a, for example, a shapefile with points
>>>>(cities
>>>>for example) at the centroids of my spatial entities. Parallel to 
> 
> that I
> 
>>>>have a list of population sizes for each city. Can Mapserver display
>>>>proportionate circles corresponding to the respective population 
> 
> sizes
> 
>>>>on
>>>>the fly, or do I have to create a vector or raster file with the
>>>>proportionate circles with an external program first and than display
>>>>this
>>>>with Mapserver ?
>>>>
>>>>Moritz
>>>>_______________________________________________
>>>>Mapserver-users mailing list
>>>>Mapserver-users at lists.gis.umn.edu
>>>>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>>>
>>>--
>>>Gerry Creager -- gerry.creager at tamu.edu
>>>Network Engineering -- AATLT, Texas A&M University
>>>Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
>>>Page: 979.228.0173
>>>Office: 903A Eller Bldg, TAMU, College Station, TX 77843
>>>
>>>
>>
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843