[mapserver-users] How to make uvraster background transparent?

[Stephen Woodbridge]

Hi All,

I'm trying to use a CONNECTIONTYPE uvraster, andand it works very well, 
except I would like the black background to be transparent so I can 
overlay it on other data. A typical LAYER definition follows.

Is there a way to do this?

Thanks,
  -Steve W

    LAYER
        NAME "uv1_0"
        GROUP "0"
        TYPE POINT
        STATUS ON
        MINSCALEDENOM 1000000
        CONNECTIONTYPE uvraster
        OFFSITE 0 0 0
        TRANSPARENCY 100
        DATA "/maps/wms/data/HYCOM/HYCOM-currents.tif"
        PROCESSING "BANDS=1,2"
        #PROCESSING "NODATA=10000"
        PROCESSING "NODATA=1.2676506002282e+30"
        PROCESSING "UV_SPACING=15"
        PROCESSING "UV_SIZE_SCALE=15.0"     # factor
        CLASS
            EXPRESSION ([uv_length] > 100)
        END
        CLASS
            EXPRESSION ([uv_length] < 4.5)  # 0.3 * factor
            STYLE
                SYMBOL "horizline"
                ANGLE [uv_angle]
                SIZE [uv_length]
                WIDTH 1
                COLOR "#3840F2"
            END # style
            STYLE
                SYMBOL "arrowhead"
                ANGLE [uv_angle]
                SIZE 4
                COLOR "#3840F2"
                POLAROFFSET [uv_length_2] [uv_angle]
            END # style
        END # class
        # ... more CLASSes
    END

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