----- Original Message -----
From: "Till Adams" <[email protected]>
To: "Dan Walton" <[email protected]>
Cc: <[email protected]>
Sent: Monday, September 28, 2009 2:03 PM
Subject: Re: [mapserver-users] MapServer dynamic map creation - Is thispossible?
Dan Walton schrieb:
I am new to WMS, so bear with my ignorance please.
I have a service that processes imagery and outputs large TIFF + World file
images (5-40 MB), and some shapefiles. Currently these images have no
pyramid or tiling. I would like to further make the images web map friendly
and my thought is that WMS and MapServer is the way to go. We will likely be
creating dozens or perhaps hundreds of these images per day. This needs to
run on Windows alongside or within IIS.
So I have a volley of questions for anyone who might have answers. Feel free
to skip any:
1. Can MapServer even do this, that is, host several large images and allow
new ones to be added on the fly via the api?
If there is a process, which generates the imags anyway, I think it's the
easiest way to let this procedure
write either a new layer to your mapfile or generate a new mapfile on it's own.
This could be requested as WMS or sth. like that.
You can also have a Postgis database where you will only put the path to your
files.
Then in your map file, you set your layer as a database SQL request.
The size of your files does not really matter as long as you have tiling and
overviews.
For example, I have used some 1 Gbyte TIFF files without any problem.
It is also good to have the same projection system in the source images and in
the request.
MapServer on the fly reprojection is only "nearest-neighbour" so image quality
could be
very bad if CRS are different.
For your shapefiles, you can also put them in a postgis database and make on-the-fly union / intersection ... using your layer
definition.
2. Can each image be a map layer or does each image need its own mapserver
instance?
each image can be a layer on it's own
3. Does the OSGeo4W include utilities to tile and pyramid the images or do I
have to arrange for that myself?
Yes, check for Gdal Tools and check also http://www.gdal.org/
Regards, ill
Thanks,
Dan Walton
gisfiretools.com
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