What's Wrong With This Picture?

Fri Aug 13 09:37:34 EDT 2004

Debbie -

Thanks!  Yes, that's definitely a problem, too.

Barbara, getting a black image means that everything is basically
working fine, but you are requesting a map using parameters that result
in none of your source data being used.  What Debbie and I both noticed
were two separate problems that both will cause you to ask for a map of
someplace far away from your data.

Your coordinates resemble UTM coordinates for Aviano, Italy, which is in
UTM Zone 33.  I can't tell what datum you're using, but WGS84 is a safe
guess.  The EPSG code for UTM Zone 33N / WGS84 is 32633, so changing
"init=epsg:4326" to "init=epsg:32633" will probably help.

        - Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Pagurek, Debbie
Sent: Friday, August 13, 2004 9:16 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] What's Wrong With This Picture?

I have a feeling that you might have another problem, because your
Projection is:
  PROJECTION
    "init=epsg:4326"
  END
which is a Geographic Projection (latitude and longitude), but the
EXTENT you've indicated looks like it's in meters or something other
than Decimal Degrees.

In addition to what Ed said, you probably need to find out what the
projection your data is in.  Then you need to find the corresponding
epsg code.  After you've done that, it is possible to reproject the data
on the fly using other epsg codes.

Debbie

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Ed McNierney
Sent: Thursday, August 12, 2004 7:09 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] What's Wrong With This Picture?

Barbara -

It looks like you did pretty well!

Your EXTENT line in the map file should be MINX MINY MAXX MAXY - you've
got the two Y values reversed, which means you're asking for nothing
(and getting it <g>).  Try just swapping those two numbers.

        - Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
Phone: +1 978 251-4242   Fax: +1 978 251-1396 

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Barbara Zack
Sent: Thursday, August 12, 2004 5:29 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] What's Wrong With This Picture?

My apologies for bothering the list with this, but I'm running out of
time. I'm primarily a programmer with almost no GIS background. Being
the only available entity, I was asked to get MapServer up and running
as a WMS server. Obviously I have no business doing this, but here I am.
I managed to get a Linux server (Debian sarge) up and running, GDAL
compiled with mrsid support, MapServer compiled, and the demo working.
The map file part is beyond my comprehension. The one I put together,
only half of which I actually understands, produces an XML capabilities
document with no warning messages. However, GetMap gives me a blank png
as output. Below are the results of mapserv -v and gdalinfo in case
that's important. Following that is my first attempt at a map file, for
your amusement. I don't understand about half of what I have in there.
Any pointers would be so greatly appreciated.

Thanks!
Barbara Z

./mapserv -v

MapServer version 4.2.2 OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP SUPPORTS=PROJ
SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER SUPPORTS=WFS_SERVER INPUT=EPPL7
INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
========================================
gdalinfo /var/www/aviano/aviano.sid

Driver: MrSID/Multi-resolution Seamless Image Database (MrSID) Size is
89286, 111281 Coordinate System is `'
Origin = (311999.989722,5105471.083134)
Pixel Size = (0.06720000,0.06720000)
Metadata:
  IMAGE__COLOR_SCHEME=0
  IMAGE__DATA_TYPE=0
  IMAGE__INPUT_FILE_SIZE=0.000000
  IMAGE__WIDTH=89286
  IMAGE__HEIGHT=111281
  IMAGE__XY_ORIGIN=312000.023322,5105471.116734
  IMAGE__X_RESOLUTION=0.067200
  IMAGE__Y_RESOLUTION=0.067200
Corner Coordinates:
Upper Left  (  311999.990, 5105471.083)
Lower Left  (  311999.990, 5112949.166)
Upper Right (  318000.009, 5105471.083)
Lower Right (  318000.009, 5112949.166)
Center      (  314999.999, 5109210.125)
Band 1 Block=89286x64 Type=Byte, ColorInterp=Red Band 2 Block=89286x64
Type=Byte, ColorInterp=Green Band 3 Block=89286x64 Type=Byte,
ColorInterp=Blue ===========================================
MAP
  EXTENT 311999.990 5112949.166 318000.009 5105471.083
  IMAGETYPE png
  SIZE 783 976
  PROJECTION
    "init=epsg:4326"
  END
  OUTPUTFORMAT
    NAME png
    DRIVER "GD/PNG"
    MIMETYPE "image/png"
    IMAGEMODE PC256
    EXTENSION "png"
  END
  WEB
    METADATA
        "wms_title" "Aviano Map"
    "wms_onlineresource"
"http://sid/cgi-bin/mapserv?map=/var/www/aviano/aviano.map&"
    "wms_srs" "EPSG:4326"
    END
  END

  LAYER
    NAME "Aviano1"
    DATA "/var/www/aviano/aviano.sid"
    TYPE raster
    STATUS on
    METADATA
      "wms_title" "Aviano Raster"
      "wms_onlineresource"
"http://sid/cgi-bin/mapserv?map=/var/www/aviano/aviano.map&"
    END
    CLASSITEM "[pixel]"
    CLASS
      EXPRESSION ([pixel] < 64)
      COLOR 0 0 0
    END
    CLASS
      EXPRESSION ([pixel] >= 64 AND [pixel] < 128)
      COLOR 255 0 0
    END
    CLASS
      EXPRESSION ([pixel] >= 128 AND [pixel] < 196)
      COLOR 0 255 0
    END
    CLASS
      EXPRESSION ([pixel] >= 196 AND [pixel] < 256)
      COLOR 0 0 255
    END
  END
END