[mapserver-users] Can the PROCESSING layer attribute be set dynamically through (PHP) MapScript?

[Jorrit Goddijn]

Hi all,

I'm drawing layers based on GRIB data files. Each file contains several bands (datasets). I can access these datasets by setting the PROCESSING attribute on the LAYER object. As in this example:

#########################
LAYER
      NAME "current_grid"
      TYPE POINT
      CONNECTIONTYPE uvraster
      DATA "/var/www/mapserver/data/grib/routeguard/4nwwin99_2013110412.grb2"    #v and u-component of current
      PROCESSING "BANDS=1,2"
      PROCESSING "UV_SPACING=20"
      CLASS
        STYLE
          SYMBOL "arrow"
          ANGLE [uv_angle]
          SIZE [uv_length]
          COLOR 255 0 0
        END # style
      END # class

      PROJECTION
          #"init=epsg:4326"
          "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +pm=-360"
      END
END # layer
####################

This works fine. But I need to set the PROCESSING values dynamically through mapscript. If I add this code to my script (which works fine without these lines):

####################
    $map = ms_newMapObj($_GET['MAP']);
    $current_layer = $map->getlayerbyname('current_grid');
    // both of these do not work
   //$current_layer->set('processing', 'BANDS=1,2'));
    //$current_layer->setprocessing('BANDS=1,2'));
    $request = createRequest("");
   $result = $map->owsdispatch($request);
####################

I get an internal server error (500). It seems that setting any attribute via the layer->set() method causes this behavior. I'm migrating from MS 5.4, does the set method still work as expected?

Thank you

Jorrit Goddijn
jorrit.goddijn at meteogroup.com
MeteoGroup

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