[Mapserver-users] DRGs in MapServer

Thu Jul 1 06:59:26 PDT 2004

This can be done in both ArcIMS and in Mapserver.

In ArcIMS all you need to do is put all the DRGs in a directory and call it
as an Image Catalog and it will index and only read the images that are in
the current view (you can set min/max scale to limit when they are shown).

In Mapserver, you will need to create a tile index and then call that in
your map file.  (Instructions here:
http://mapserver.gis.umn.edu/doc42/raster-howto.html#)

***********************************
David W Bitner
GIS Specialist
Metropolitan Airports Comission

-----Original Message-----
From: mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu]On Behalf Of Stephen H.
Savage
Sent: Thursday, July 01, 2004 8:00 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] DRGs in MapServer

Greetings,

   In AZ we have nearly 2,000 DRG's at 1:24,000 scale.  We would like to
have
these maps displayed as the background for our web site that serves
archaeological sites and projects.  However, in ArcIMS, which we are
currently
using, all these image layers would have to be pre-loaded into the map; this
is
clearly out of the question.  What we need to do is add and subtract image
layers from the map on-the-fly, as a user pans or zooms around the map.  Is
this something that MapServer can do?  Ideally, at the scale at which we
want
the DRGs to be displayed, portions of no more than 4 map tiles would be
displayed at any time.

   Basically, ArcIMS defines the map once, with all its layers loaded.
Then,
for each user session, the map server sends out session data such as the
view
extent, which layers are on, etc.  You can't redefine the map's layers
because
it involves a situation where each user would get a different map definition
rather than a different instance of the same map.  Is the the same way thet
MapServer works?

Thanks,

-Steve