[Mapserver-users] Maximum Num of Features?

[Dylan Keon]

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 
>>