[mapserver-users] Having an issue displaying a VRT file

Stephen Woodbridge stephenwoodbridge37 at gmail.com
Sat Jun 29 09:52:56 PDT 2019


Never mind! I figured it out.

If your MAP->NAME is the same as you LAYER->NAME then that take priority 
over of LAYER->NAME and then display all the other layers also. In this 
case rendering the the gray scale tif over the colors.

-Steve

On 6/29/2019 12:22 PM, Stephen Woodbridge wrote:
> Hi all,
>
> I've been banging my head against this problem for a while so asking 
> for ideas.
>
> Thanks,
>   -Steve W
>
> I have GTiff file the looks like:
>
> $ gdalinfo -stats -hist /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.tif
> Driver: GTiff/GeoTIFF
> Files: /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.tif
> Size is 8010, 6000
> Coordinate System is:
> GEOGCS["WGS 84",
>     DATUM["WGS_1984",
>         SPHEROID["WGS 84",6378137,298.257223563,
>             AUTHORITY["EPSG","7030"]],
>         AUTHORITY["EPSG","6326"]],
>     PRIMEM["Greenwich",0],
>     UNIT["degree",0.0174532925199433],
>     AUTHORITY["EPSG","4326"]]
> Origin = (-120.033749999999998,44.883749999999999)
> Pixel Size = (0.007500000000000,-0.007500000000000)
> Metadata:
>   AREA_OR_POINT=Area
> Image Structure Metadata:
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (-120.0337500,  44.8837500) (120d 2' 1.50"W, 44d53' 1.50"N)
> Lower Left  (-120.0337500,  -0.1162500) (120d 2' 1.50"W,  0d 6'58.50"S)
> Upper Right ( -59.9587500,  44.8837500) ( 59d57'31.50"W, 44d53' 1.50"N)
> Lower Right ( -59.9587500,  -0.1162500) ( 59d57'31.50"W,  0d 6'58.50"S)
> Center      ( -89.9962500,  22.3837500) ( 89d59'46.50"W, 22d23' 1.50"N)
> Band 1 Block=8010x1 Type=Float32, ColorInterp=Gray
>   Minimum=0.001, Maximum=392.112, Mean=0.682, StdDev=6.289
> 0...10...20...30...40...50...60...70...80...90...100 - done.
>   256 buckets from -0.767845 to 392.881:
>   5116420 228446 61443 29479 20356 13649 8567 6328 4568 3350 2637 2397 
> 1852 1682 1516 1391 1404 1193 1074 957 874 824 791 663 566 560 574 545 
> 531 466 368 369 379 263 334 301 267 252 250 247 202 178 183 207 195 
> 184 155 163 166 184 152 151 150 138 101 128 131 140 85 113 98 121 127 
> 106 83 92 92 107 81 87 81 72 110 77 68 62 70 59 80 75 75 76 55 55 50 
> 51 66 56 59 44 50 52 60 43 55 52 57 54 35 60 47 35 41 30 38 37 47 49 
> 22 37 25 40 25 36 37 43 39 27 22 32 34 33 33 27 32 32 20 22 26 14 25 
> 21 26 14 16 21 12 26 15 29 23 18 20 5 9 10 9 16 17 12 14 20 19 12 16 
> 17 10 8 11 21 11 21 7 10 16 18 10 11 17 21 11 6 7 11 11 17 3 16 8 6 9 
> 19 17 9 11 11 10 11 9 8 6 16 11 12 14 12 9 11 8 6 8 7 14 10 6 3 4 3 5 
> 7 4 6 5 9 5 5 2 6 10 14 4 4 6 3 5 3 8 3 5 10 7 1 13 14 9 7 5 6 9 9 6 5 
> 10 8 6 7 5 10 11 9 7 4 0 5 0 4
>   NoData Value=-999
>   Metadata:
>     STATISTICS_MAXIMUM=392.11212158203
>     STATISTICS_MEAN=0.68159060504688
>     STATISTICS_MINIMUM=0.0010000000474975
>     STATISTICS_STDDEV=6.2888244425479
>
> I created a VRT file with that looks like:
>
> a$ gdalinfo -stats -hist /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.vrt
> Driver: VRT/Virtual Raster
> Files: /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.vrt
>        /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.tif
> Size is 8010, 6000
> Coordinate System is `'
> Origin = (-120.033749999999998,44.883749999999999)
> Pixel Size = (0.007500000000000,-0.007500000000000)
> Corner Coordinates:
> Upper Left  (-120.0337500,  44.8837500)
> Lower Left  (-120.0337500,  -0.1162500)
> Upper Right ( -59.9587500,  44.8837500)
> Lower Right ( -59.9587500,  -0.1162500)
> Center      ( -89.9962500,  22.3837500)
> Band 1 Block=128x128 Type=Byte, ColorInterp=Palette
>   Minimum=0.001, Maximum=392.112, Mean=0.682, StdDev=6.289
> 0...10...20...30...40...50...60...70...80...90...100 - done.
>   256 buckets from -0.5 to 255.5:
>   4946628 325638 83015 39917 25684 16759 13604 10800 8041 5808 4731 
> 3922 3191 2501 2130 1883 1639 1488 1266 1159 1070 1070 935 916 887 873 
> 833 713 679 620 624 541 544 535 492 445 427 351 364 390 359 389 315 
> 347 316 305 229 263 221 252 189 183 219 210 183 180 173 175 149 166 
> 156 141 123 124 115 124 133 132 119 117 106 110 95 112 119 113 117 98 
> 101 95 89 101 86 61 80 85 75 95 90 60 56 75 68 59 89 67 92 65 60 45 76 
> 66 52 60 67 50 61 55 48 41 63 73 56 47 42 42 45 35 46 42 44 57 46 52 
> 42 57 27 43 31 33 39 27 38 50 31 43 35 22 26 38 41 36 27 29 39 38 29 
> 45 29 32 35 22 41 33 31 23 25 28 15 26 24 17 28 31 42 23 11 20 24 17 
> 26 21 12 27 22 25 26 27 27 20 19 15 17 18 16 27 25 25 15 19 22 21 15 
> 16 16 18 9 19 10 11 18 17 11 16 10 13 6 14 19 4 11 17 8 18 18 14 15 11 
> 15 9 2 5 4 9 9 2 9 13 10 7 10 10 16 12 10 10 9 8 11 10 7 2 7 10 14 7 7 
> 14 11 5 7 5 14 15 5 735
>   Metadata:
>     STATISTICS_MAXIMUM=392.11212158203
>     STATISTICS_MEAN=0.68159060504688
>     STATISTICS_MINIMUM=0.0010000000474975
>     STATISTICS_STDDEV=6.2888244425479
>   Color Table (RGB with 256 entries)
>     0: 0,0,0,255
>     1: 0,0,255,255
> ...
>   254: 0,0,0,255
>   255: 255,255,255,255
>
> When I display if via mapserver it comes out all black:
>
> LAYER
>   NAME "chlorophyll"
>   STATUS on
>   TYPE raster
>   DATA "/maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.vrt"
>   PROJECTION "init=epsg:4326" END
> END
>
> But if I run:
>
> gdal_translate -of PNG
> /maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.vrt test.png
>
> test.png shows the image with the colors!
>
> The whole VRT file is:
>
> <VRTDataset rasterXSize="8010" rasterYSize="6000">
>   <GeoTransform> -120.03375 ,0.0075 , 0 , 44.88375 , 0 , -0.0075 
> </GeoTransform>
>   <Metadata>
>   </Metadata>
>   <VRTRasterBand dataType="Byte" band="1">
>     <ColorInterp>Palette</ColorInterp>
>     <SourceNoData>-999.0</SourceNoData>
>     <ColorTable>
>       <Entry c1="0" c2="0" c3="0" c4="255"/>
>       <Entry c1="0" c2="0" c3="255" c4="255"/>
>       <Entry c1="100" c2="150" c3="240" c4="255"/>
>       <Entry c1="0" c2="200" c3="0" c4="255"/>
>       <Entry c1="255" c2="255" c3="255" c4="255"/>
>       <Entry c1="250" c2="250" c3="0" c4="255"/>
>       <Entry c1="255" c2="0" c3="0" c4="255"/>
>       <Entry c1="255" c2="120" c3="0" c4="255"/>
>       <Entry c1="225" c2="0" c3="225" c4="255"/>
>       <Entry c1="0" c2="0" c3="0" c4="255"/>
>       <Entry c1="120" c2="120" c3="120" c4="255"/>
>       <Entry c1="255" c2="230" c3="255" c4="255"/>
>       <Entry c1="255" c2="227" c3="255" c4="255"/>
>       <Entry c1="255" c2="224" c3="255" c4="255"/>
>       <Entry c1="255" c2="222" c3="255" c4="255"/>
>       <Entry c1="255" c2="219" c3="255" c4="255"/>
>       <Entry c1="255" c2="216" c3="255" c4="255"/>
>       <Entry c1="255" c2="214" c3="255" c4="255"/>
>       <Entry c1="255" c2="211" c3="255" c4="255"/>
>       <Entry c1="255" c2="209" c3="255" c4="255"/>
>       <Entry c1="255" c2="206" c3="255" c4="255"/>
>       <Entry c1="255" c2="203" c3="255" c4="255"/>
>       <Entry c1="255" c2="201" c3="255" c4="255"/>
>       <Entry c1="255" c2="198" c3="255" c4="255"/>
>       <Entry c1="255" c2="195" c3="255" c4="255"/>
>       <Entry c1="255" c2="193" c3="255" c4="255"/>
>       <Entry c1="255" c2="190" c3="255" c4="255"/>
>       <Entry c1="255" c2="188" c3="255" c4="255"/>
>       <Entry c1="255" c2="185" c3="255" c4="255"/>
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>       <Entry c1="0" c2="60" c3="255" c4="255"/>
>       <Entry c1="0" c2="72" c3="255" c4="255"/>
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>       <Entry c1="0" c2="97" c3="255" c4="255"/>
>       <Entry c1="0" c2="109" c3="255" c4="255"/>
>       <Entry c1="0" c2="121" c3="255" c4="255"/>
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>     </ColorTable>
>     <SimpleSource>
>       <SourceFilename 
> relativeToVRT="0">/maps/wms/data/VIIRS_CHLORA/VIIRS_CHLORA.tif</SourceFilename>
>       <SourceBand>1</SourceBand>
>       <SrcRect xOff="0" yOff="0" xSize="8010" ySize="6000"/>
>       <DstRect xOff="0" yOff="0" xSize="8010" ySize="6000"/>
>     </SimpleSource>
>   </VRTRasterBand>
> </VRTDataset>
>


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