[mapserver-users] display wind or current arrow map

[Ron Goldman]

Hi daryl,

thank you for your answer.


I can preprocess the netcdf to change it to direction/magnitude. but I 
couldn't get the SYMBOL to work with raster LAYER.

My mapfile looks something like this:


LAYER

   ...

   DATA "NETCDF:\test\test.nc:direction"

   TYPE RASTER

   PROCESSING     "BANDS=1"

   PROCESSING     "SCALE=0,360"

   ...

   CLASS

       EXPRESSION ([pixel] > 0.0 )

       STYLE

         SYMBOL "arrow"

         ANGLE     [pixel]

         COLOR     0 0 0

       END

    END

   ...


but I just get an black map of my raster. Are symbols supported with 
rasters?


akrherz at iastate.edu wrote:

> On Wed, 24 Sep 2008, Ron Goldman wrote:
>
>> I have a netcdf containing the Lon/Lat components of winds and 
>> currents and I want to display them on an arrow map. Is there a way 
>> to do this? so far I only found a way to do this for point 
>> shapefiles, but my data is composed of two rasters. any suggestions 
>> would be greatly appreciated.
>
> Hi Ron,
>
> Do you need to do this within the Mapserver CGI environment or can you 
> use Mapscript to generate your images?  If you can use mapscript, you 
> can write your own logic to figure out the rotation values based on 
> the components.
>
> If you are stuck without mapscript, you could use another tool to add 
> a rotation variable to your NetCDF file and then directly use it in 
> your mapfile for symbol rotation (I believe this is now supported in 
> 5.2.0)...
>
> Others on this list may have more clever ideas.
>
> daryl
>


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