WMS Server serving large raster

[Ed McNierney]

Milo -
 
This kind of application isn't any problem at all.  It sounds like your
base rasters are a collection of tiled data all belonging to the same
data set.  You can use the gdaltindex utility from GDAL to create a
shapefile index of your rasters, and then use the TILEINDEX statement in
your LAYER definition to refer to that tile index file.  MapServer will,
for any given request, use the tile index file to determine which input
rasters are needed, read the correct data from each image, produce the
requested 100x100 output image and send it to the client.
 
To specifically answer your three questions:
 
1. Use a tile index as described.  There are other things you can do to
tune the internal format of each raster file.  What file format do your
rasters use?  Do you have the freedom to modify that file format, or do
you have to use them as they are?
2. MapServer will deliver a WMS image response that includes only the
data you need.
3. The tile index will give you the most compact map file.
 
    - 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 


________________________________

From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Milo van der Linden
Sent: Wednesday, August 03, 2005 5:02 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] WMS Server serving large raster


Hello list,
 
I have set up my first WMS Server and joined it with my standard MapInfo
client, all works well. I am facing the following challenge however:
 
- I have over 1,5Gb of raster image data covering the whole of the
Netherlands at a 1:25000 scale. I want to serve this data via my
MapServer WMS Server in order to get it into my WMS capable smartphone
GPS viewer. Since my phone holds limited memory, I want the rasters to
be sent accross the air smart, meaning that only for the resolutions
displayed (100x100) that part of the image should be sent.
 
My base rasters are 5000x5000 pixels and about 5mb in size, they are
tiled and all connect together or overlap.
 
 
In what way can I best organize my Map File in order to get: 
- Highest performance on my smartphone
- only the detail that I need?
- The most compact Layer definition in the Map File?
 
Kind regards,
Milo van der Linden 
AVD-ICT GIS Consultant 

*	Hoogbloklandseweg 24 
*	4205 NE  Gorinchem

Tel. +31 183 50 81 50 
Fax. +31 183 50 81 60 
Mob. +31 629 54 06 96 

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