[mapserver-users] Figuring out pixel size for .wld and raster imags

[Ed McNierney]

Steve -

You may be looking in the wrong place.  You need to distinguish between MapServer correctly generating a valid image that's NOT what you think it should be, MapServer failing to create an image at all, and MapServer creating an image that you cannot access from the Web.

Are JPEG images being created in the /mapserv/ directory?  If not, then you probably have a permissions problem that prevents MapServer from writing to that directory.  If there are JPEGS there, then you probably have a Web permissions problem that prevents those images from being viewed by a browser (or your URL is not correctly mapped to that /mapserv/ directory).

If you get your browser to display valid, blank images, THEN you should worry about your world files.

	- 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: stevek at avernus.net [mailto:stevek at avernus.net]
Sent: Friday, September 20, 2002 10:41 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [mapserver-users] Figuring out pixel size for .wld and raster
imags


Hi all,

I'm having problems getting mapserver to produce anything other than
a 28x30 broken image. I'm working currently with a raster image,
just trying to get it to even display, never mind actually putting
points up.

My raster image is as follows:
orig.tiff TIFF 1445x1044 DirectClass 8-bit 2474Kb 1.3u 0:02

I know the GPS co-ordinates of the top left and bottom right:
Top left is: -6.430508, 53.432611
Bottom right is: -6.065211, 53.263772

Does this mean the pixel size is as follows?
X pixel size: -0.000257
Y pixel size: 0.000005

Here is my world file:
-0.000257
0.0
0.0
0.000005
-6.424875
53.26377

Here is my map.map file:
NAME test
STATUS on
SIZE 600 600 # set size of output image
EXTENT -6.430508 53.432611 -6.065211 53.263772

UNITS DD
SHAPEPATH "data"
IMAGECOLOR 255 255 255                  # set background colour of image
IMAGETYPE jpeg

#
# Start of web interface definition
#
WEB
 LOG "./mapserv.log"
 TEMPLATE template.html
 IMAGEPATH "./mapserv/"
 IMAGEURL "/mapserv/"
 METADATA
  WMS_TITLE "testing"
  WMS_ABSTRACT "abstract"
  WMS_ACCESSCONSTRAINTS none
  WMS_ONLINERESOURCE "http://www.foobar.org/test"
 END
END

SCALEBAR
 IMAGECOLOR 255 255 255
 LABEL
  COLOR 0 0 0
  SIZE SMALL
 END
SIZE 350 5
COLOR 255 255 255
BACKGROUNDCOLOR 0 0 0
OUTLINECOLOR 0 0 0
UNITS MILES
INTERVALS 5
STATUS on
END

LAYER
  NAME "map1"
  TYPE RASTER
  STATUS OFF
  DATA "orig.tiff"
 CLASS
  NAME "Map1"
  END
END

END

Steve Kennedy