[mapserver-users] efficiently displaying daily changing vector data

[Brent Fraser]

Puneet,

1. If the incoming CSV format and content is consistent then using OGR 
would likely be OK.  If you need to modify the values to make it 
acceptable to Mapserver (e.g. change your angles from Heading 
(clockwise, north is 0) to "standard" angles (counter-clockwise, + x 
axis is 0), the PostGIS would be a better solution.  Note that RFC 64 
may solve the heading angle problem by allowing you to do the math in 
the mapfile, but I haven't tried it.  Also you may want to test both 
CSV/OGR and PostGIS solutions for performance reasons.

2. There are a couple of vector( Type vector, not TrueType) arrow 
symbols described at the bottom of 
http://mapserver.org/mapfile/symbology/construction.html

Best Regards,
Brent Fraser


On 9/20/2011 10:57 PM, Mr. Puneet Kishor wrote:
> I have just finished reading the following thread
>
> Mapserver - User - How to display vector symbols (direction and magnitude) in MapServer?
> http://osgeo-org.1803224.n2.nabble.com/How-to-display-vector-symbols-direction-and-magnitude-in-MapServer-td1971531.html
>
>
> Two questions --
>
> 1. What is the most efficient way to display vector data that comes to me on a daily basis as text files. I have x,y, length and angle information in these text files (along with some other info). I guess, I will have to massage the files to convert them to clean CSV with only the first line containing the column names. Then I can access the file as an OGRVRTDataSource. Or, should I insert the data in a Pg table and then use that? The files will be refreshed daily, so the processing needs to be done only once a day.
>
> 2. The thread above makes a mention of a Mapfile CLASS definition like so
>
>    CLASS
>       SYMBOL 'arrow'
>       ANGLE [Rate]
>       SIZE [Az]
>       COLOR 0 0 0
>    END
>
> Is there an arrow symbol definition that I can use, or is that only possible with truetype fonts?_______________________________________________
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