[Mapserver-users] Adding an 8-bit raster layer.

[Sharma, Akash]

Hi everyone,

I recently started using Mapserver and am new to the list so please forgive
me if I miss out on some technical details.

I have been trying to add a separate raster layer by using a 8-bit .raw
file. For this I first convert this raw file to 8-bit TIFF file using
raw2tiff program available with the libtiff library. Then I use
gdal_translate to convert it to GTiff. The information that I get using
gdalinfo is as shown below:

 [root@Yachats a05]# gdalinfo rlayer.tif
Driver: GTiff/GeoTIFF
Size is 2160, 1080
Coordinate System is `'
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0, 1080.0)
Upper Right ( 2160.0,    0.0)
Lower Right ( 2160.0, 1080.0)
Center      ( 1080.0,  540.0)
Band 1 Block=2160x3 Type=Byte, ColorInterp=Gray

Pleaes note that the .raw file is 2160 x 1080 pixels (Bytes).

Then I use the following mapfile to add a layer. Although it shows the
extent of the image in the browser but the layer is not displayed. I would
like to add here that I have been able to open the Tiff  file on Irfanview
and MS Photoeditor and it shows up fine like the way I wanted it to be.

The mapfile listing is as below:

NAME FIRSTMAP
SIZE 600 300
STATUS ON
SYMBOLSET "/apps/web/ms_apps/symbols/symbols35.sym"
EXTENT  0.0 0.0 2160.0 1080.0
UNITS METERS
SHAPEPATH  "/home/cs540S03/

WEB
  IMAGEPATH "/apps/web/ms_output/"
  IMAGEURL "/ms_output/"
END

LAYER
  NAME "ecoregion"
  DATA  "/gisdata/GED_datasets/a05/rlayer.tif"
  STATUS DEFAULT
  TYPE RASTER
  OFFSITE 0
END

LAYER
  NAME world
  TYPE POLYGON
  STATUS ON
  DATA cntry02
  CLASS
     COLOR 255 255 255
     OUTLINECOLOR 200 200 200
  END

END

END

Am I doing anything wrong here?? I would be grateful if someone could let me
know what needs to be done.

Also I tried changing the Upper Left and Lower right coordinates of the tiff
file using "gdalwarp" but it gave me some error. It would be great if
someone could give a specific example on how to use gdalwarp.

Thanks

Akash Sharma
M.S. (CS &IME)
Oregon State University





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