[Mapserver-users] Maximum Num of Features?
Dylan Keon
keon at nacse.org
Wed Jan 29 17:31:29 PST 2003
I'd say it's difficult for anyone to distinguish among 50+ colors. If
you're using a scale-dependent layer it can work well (i.e., if you're
zoomed in to just a few classes when the layer appears). But the legend
is definitely hard to interpret with that many colors, regardless.
>Wouldn't that many colours also make it difficult to read
>for people with less than average colour perception?
>
>Geologists are able to to that many classes, but they also
>use stiples and other fill patterns.
>
>Antti
>
>>
>>-----Original Message-----
>>From: Chris Hagwood [mailto:chagwood at ci.garner.nc.us]
>>Sent: Thursday, 30 January 2003 9:15 AM
>>To: mapserver-users at lists.gis.umn.edu
>>Subject: [Mapserver-users] Maximum Num of Features?
>>
>>
>>I have a layer (police zones) that I would like to make colored so that it
>>each zone will stand out. When I try, it appears to choke mapserver.
>>
>>Here's the part from my .map file:
>>LAYER
>> NAME newzone
>> TYPE Polygon
>> STATUS off
>> DATA newdist
>>
>> CLASS
>> EXPRESSION '8300'
>> COLOR 243 137 139
>> OUTLINECOLOR 0 0 0
>> END # CLASS
>>
>> CLASS
>> EXPRESSION '8301'
>> COLOR 123 254 205
>> OUTLINECOLOR 0 0 0
>> END # CLASS
>>
>> #REPEAT for each zone
>>
>> CLASS
>> EXPRESSION '8412'
>> COLOR 40 128 60
>> OUTLINECOLOR 0 0 0
>> END # CLASS
>>END # LAYER
>>
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