I had problems with chunky Raster WMSs too, specifically with
TerraServer orthophotos. My solution was to change the format for the
layer to jpeg, like so:
"WMS_FORMAT" "image/jpeg"
and I added one line to my outputformat block for jpeg in the mapfile,
like this:
FORMATOPTION "QUALITY=100"
I'm still serving the final output as png, and there is no chunkiness at
all. I didn't have to mess with any of the PROCESSING options either.
Cheers,
Jared Chapiewsky
Gary Watry wrote:
My website is
http://gw102.coaps.fsu.edu/httpdocs/indexmaster.html
The layer code for a wms file is
LAYER
NAME Blue_Marble
STATUS OFF
TYPE RASTER
OFFSITE 0 0 0
GROUP "Background"
CONNECTIONTYPE WMS
CONNECTION "http://wms.jpl.nasa.gov/wms.cgi?";
PROJECTION
"init=epsg:4326"
END
METADATA
"wms_name" "modis"
"wms_server_version" "1.1.1"
"wms_srs" "EPSG:4326"
"wms_format" "image/png"
END
END
If you look at it the file is real chunky or blocky, all the wms files work
the same.
Any suggestions?
______________________________________________________________
Gary L. Watry
GIS Coordinator
Center for Ocean-Atmospheric Prediction Studies
FSU / COAPS
Johnson Building, RM 215
2035 East Paul Dirac Drive
Tallahassee, Florida 32306-2840
E-Mail: [EMAIL PROTECTED]
-----Original Message-----
From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On
Behalf Of Clint Johnson
Sent: Friday, April 07, 2006 7:34 PM
To: [email protected]
Subject: Re: [UMN_MAPSERVER-USERS] Increase Clarity of WMS
Kyle,
Your error is due to the line that says
PROCESSING "RESAMPLE=AVERAGE"
If you want a quality image then by all means do NOT use average dithering.
example of average dithering
http://www.visgraf.impa.br/Courses/ip00/proj/Dithering1/average_dithering.ht
ml
Use one of:
PROCESSING "RESAMPLE=BILINEAR"
PROCESSING "RESAMPLE=BICUBIC" # preferable
Stay away from nearest and average.
Without having to go into Digital processing 101, using nearest or
average will cause your image to "chunk" when it is re-sampled (ie
zoomed in or out); whereas, bilinear and bicublic will give it a nice
"anti-aliased" look as you zoom in.
Cheers,
Clint
