Trying to display a geotiff DEM within MapServer

Thu Apr 26 12:21:11 EDT 2007

Hi,

I am trying to display a DEM which is in geotiff format (gdalinfo
listing below) within MapServer (mapfile layer
listing below) and the image is all white.
When trying to display this same image within the desktop application
called "global mapper" it first asks
whether you want to display this data as an image or as a DEM.  If
select as an image then is displays an image
that is all the same color similar to mapserver and if select as a DEM
then it displays a color coded elevated image.
Is their a way to display a DEM within mapserver that displays the
elevated image instead of the all white image
that I am currently displaying?

Thanks,

John J. Mitchell

-----------------------------------------------------------------------
MAP

 # all temp files get prefixed with this string
 NAME All_Raster_Layers_ignore

 # always returns a map
 STATUS ON

 # image format options
  OUTPUTFORMAT
   NAME png
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE RGB
   EXTENSION "png"
 END

  # projection of the INTERFACE that this mapfile supports
 PROJECTION
   "init=epsg:4326"
 END

  # minx miny maxx maxy
 EXTENT -180 -90 180 90 # World

 # units of map/app
 UNITS DD

 WEB
  # this is set in the form which initializes the page, but can be set
here if you want
   IMAGEPATH "/ms4w/tmp/ms_tmp/"

  # this is set in the form which initializes the page, but can be set
here if you want
   IMAGEURL "/ms_tmp/"
 END

 # start of layer definitions

 LAYER
  # name of layer
  NAME Columbia_1000000012_utm_19_fullResolution_ignore
  GROUP "Columbia_1000000012_utm_19"

  PROJECTION
     "init=epsg:32619"
  END

  TYPE RASTER
  STATUS ON
    TILEINDEX "Z:\GlobalView\NGA\Columbia\1000000012\utm_19\fullResolution.shp"
    TILEITEM "Location"
#  OFFSITE 0 0 0
    MAXSCALE 10000
 END

-----------------------------------------------------------------------
Driver: GTiff/GeoTIFF
Size is 2792, 2794
Coordinate System is:
PROJCS["WGS 84 / UTM zone 19N",
      GEOGCS["WGS 84",
        DATUM["WGS_1984",
              SPHEROID["WGS 84",6378137,298.2572235630016,
                  AUTHORITY["EPSG","7030"]],
              AUTHORITY["EPSG","6326"]],
          PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433],
          AUTHORITY["EPSG","4326"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",-69],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
          AUTHORITY["EPSG","9001"]],
      AUTHORITY["EPSG","32619"]]
Origin = (168297.500000000000000,761002.500000000000000)
Pixel Size = (5.000000000000000,-5.000000000000000)
Metadata:
  AREA_OR_POINT=Area
Corner Coordinates:
Upper Left  (  168297.500,  761002.500) ( 72d 0'3.71"W,  6d52'31.02"N)
Lower Left  (  168297.500,  747032.500) ( 72d 0'0.88"W,  6d44'56.70"N)
Upper Right (  182257.500,  761002.500) ( 71d52'29.42"W,  6d52'33.81"N)
Lower Right (  182257.500,  747032.500) ( 71d52'26.72"W,  6d44'59.44"N)
Center      (  175277.500,  754017.500) ( 71d56'15.18"W,  6d48'45.26"N)
Band 1 Block=256x256 Type=Float32, ColorInterp=Gray
    Minimum=238.364, Maximum=1652.747, Mean=684.315, StdDev=268.118
    Metadata:
    STATISTICS_MINIMUM=238.36408996582
    STATISTICS_MAXIMUM=1652.7473144531
    STATISTICS_MEAN=684.31510635898
    STATISTICS_MEDIAN=628.00527274609
    STATISTICS_MODE=506.19808101654
    STATISTICS_STDDEV=268.11784359311
    STATISTICS_HISTONUMBINS=256
    STATISTICS_HISTOMIN=240.4369354248
    STATISTICS_HISTOMAX=1657.8297119141
      LAYER_TYPE=athematic
    STATISTICS_HISTOBINVALUES=5200|20332|20380|24760|23240|16028|7444|4828|4632|7912|18480|38392|44548|44292|52980|55312|53024|60224|56604|51976|49164|50864|45892|47932|47932|48004|45888|46656|49592|50648|49180|51948|53668|53692|51920|54680|59528|65148|73368|85132|88648|79764|73992|73216|72108|74412|76488|99608|103600|95308|78448|73684|68140|70020|72932|75032|79512|82636|83640|77584|75844|77228|66504|59480|58160|55356|55064|54572|53656|52912|51696|51936|52816|52924|53996|52560|52192|51984|51144|50164|48892|48960|49412|49352|48220|49576|50632|49420|48748|48368|46484|47664|46132|47004|46636|45124|43416|41900|40692|40824|39976|40188|41860|40652|40368|39692|39740|40220|38624|37064|37240|37096|37844|39032|39880|40800|40172|38876|37964|39788|38152|37716|37064|34944|34712|33448|33896|33800|33420|33012|32080|30868|30976|29740|30700|29972|29664|29712|29248|29088|27892|27036|26092|24756|24736|25132|24360|24300|23608|22616|21032|20160|19760|18748|18616|18964|18400|17624|16692|16348|15628|15376|14644|14520|14064|13992|14160|15048|16600|15976|14892|13428|12740|12360|11868|11520|10672|9772|9344|9000|8672|8732|8520|9020|8604|8052|8136|8240|8036|7824|7844|8280|7816|7624|7180|7308|6744|7024|6880|6800|6904|6336|6056|6120|5968|6008|5936|5388|5176|4996|5020|4520|4232|4288|4184|3856|3820|3752|3420|3632|3472|3316|3448|3316|3120|2924|2816|2652|2512|2296|1940|1624|1336|1260|1252|936|668|568|576|548|484|512|456|412|376|360|264|288|168|112|104|76|72|12|16|4|

-- 
John J. Mitchell
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