[mapserver-users] Documentation for serving large raster
imagesusing tile cache.
Bob Basques
Bob.Basques at ci.stpaul.mn.us
Mon Nov 10 16:27:07 EST 2008
Asif,
While it may be a bit of overhead to implement just for testing, the
GeoMoose client would definitely help with your performance testing. If
you combine it with FireBug/FireFox, you should be able to extract all
the performance information you need (from the client end).
>From the server side, you can run the MapServer requests on the
commandline. In my experience though, the web side of the equation is
usually the bottleneck for most performance issues.
bobb
>>> "Asif Memon" <mmemon at sdsc.edu> 11/10/08 3:21 PM >>>
Thanks Roger,
I have tiled a large mosaic(2 GB) by using the GDAL utility(gdal_convert
"TILED=YES"). I want to test the performance for querying the mosaic
with the zoom functionality. Do I need to write a client or is there
anything readily available with which I can check the performance?
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Monday, November 10, 2008 9:35 AM
To: Asif Memon
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Documentation for serving large raster
images using tile cache.
Hi Asif,
My apologies. I saw your message Friday evening but forgot about it
over the weekend in the course of reinstalling my Linux OS. If time is
of the essence, posting your question to the entire list should ensure a
speedier response.
Regarding your questions:
1) I am not aware of any applications that will act as viewers for
Mapserver operating in "map" mode. They may exist, but I'm not familiar
with them. I tend to use Mapserver in only one of two ways at the
moment; in "map" mode to generate static maps, in "wms" mode with a
connection to it via OpenLayers (or TileCache).
2) Regarding the path to your mapfile, I believe there are several
solutions that you can try if your goal is to shorten the URL string.
They are well-explained here -
http://mapserver.gis.umn.edu/docs/howto/wms_server/#more-about-the-online-resource-url.
As far as why the 1st URL doesn't actually work, it's because the path
should be relative to the mapserv.exe location in cgi-bin, not to
htdocs. So try this instead:
-
http://localhost:9090/cgi-bin/mapserv.exe?map=../htdocs/mapdemo/itasca_demo.map&mode=map
<http://localhost:9090/cgi-bin/mapserv.exe?map=/mapdemo/itasca_demo.map&mode=map>
Roger
--
On Mon, Nov 10, 2008 at 1:58 AM, Asif Memon <mmemon at sdsc.edu> wrote:
Hi All,
I have couple of question, could you please take a look at it :
1) Do you know any Map Server Client that allows viewing the image
service (created on the Minnesota Map Server) if I give the URL listed
below:
http://localhost:9090/cgi-bin/mapserv.exe?map=/path/to/itasca.map&mode=map"
2) I am using Windows XP on my PC. When I give the URL in this
format -
http://localhost:9090/cgi-bin/mapserv.exe?map=/mapdemo/itasca_demo.map&mode=map",
it doesn't work. But if I give it in format -
http://localhost:9090/cgi-bin/mapserv.exe?map=C:\Asif\work\devtools\MMS\ms4w\Apache\htdocs\mapdemo\itasca_demo.map&mode=map
<http://localhost:9090/cgi-bin/mapserv.exe?map=C:%5CAsif%5Cwork%5Cdevtools%5CMMS%5Cms4w%5CApache%5Chtdocs%5Cmapdemo%5Citasca_demo.map&mode=map>
, it works. The problem in giving the URL is this format is I have to
put the complete path starting with "C: drive" and if I have to run it
on the server, I cannot give it like that.
Could you please help me with both the above issues? Thanks!
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Tuesday, October 28, 2008 8:11 PM
To: Asif Memon
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] RE: Documentation for serving large
raster images using tile cache.
Hi Asif,
I downloaded the demo.tif file that you sent earlier, and the
itasca_demo.map from you rprevious email. I changed the path in the
DATA portion of the LAYER section to point to my filesystem,
DATA "/var/www/mapfiles/itasca/demo.tif"
and also changed the EXTThis matches the extent of the file when you run gdalinfo against it
(min_x min_y max_x Max_y).
With these changes, I'm able to view the file with the following URL:
http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/itasca/itasca_demo.map&mode=map
(Note, I'm running this in Linux, so paths and URLs are going to be
slightly different than yours)
Try changing your EXTENT entry to match mine, that might do the trick.
--
On Tue, Oct 28, 2008 at 3:45 PM, Asif Memon <mmemon at sdsc.edu> wrote:
Thanks Roger.
I don't see any errors now, but no image appears in the browser(the
browser is blank). I made minor changes to the map file that you sent me
(about the paths, attached is the file).
The URL that I am using in the browser is
http://localhost:9090/cgi-bin/mapserv.exe?map=C:\Asif\work\devtools\MMS\ms4w\Apache\htdocs\mapdemo\itasca_demo.map&mode=map
<http://localhost:9090/cgi-bin/mapserv.exe?map=C:%5CAsif%5Cwork%5Cdevtools%5CMMS%5Cms4w%5CApache%5Chtdocs%5Cmapdemo%5Citasca_demo.map&mode=map>
Please correct me if anything is wrong in the URL or in the map file.
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Tuesday, October 28, 2008 3:17 PM
To: Asif Memon
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] RE: Documentation for serving large
raster images using tile cache.
Hi Asif,
Ok, here's a new mapfile that you can try. Change your request to point
to this one, and see if you get an image back in your browser.
Roger
--
On Tue, Oct 28, 2008 at 2:06 PM, Asif Memon <mmemon at sdsc.edu> wrote:
I believe one of the "END" was missing at the end of the file, I have
added that. This resolves the earlier error and generated a new one -
msDrawMap(): Image handling error. Unable to initialize image.
msPrepareImage(): General error message. Image dimensions not specified.
msCalculateScale(): General error message. Invalid image extent,
minx=-1.000000, miny=-1.000000, maxx=-1.000000, maxy=-1.000000.
mapserv(): Web application error. No way to generate map extent.
Any help is much appreciated?
Sincerely,
Asif Memon
From: Asif Memon
Sent: Tuesday, October 28, 2008 1:48 PM
To: 'Roger André'
Cc: 'mapserver-users at lists.osgeo.org'
Subject: RE: [mapserver-users] RE: Documentation for serving large
raster images using tile cache.
No, TileCache didn't come with that. I am trying to view any image right
now to see an example of serving an image into Mapserver.
I changed the path of the WMS
URL(http://localhost:9090/cgi-bin/mapserv.exe?map=C:\Asif\work\devtools\MMS\ms4w\Apache\htdocs\mapdemo\demo.map&mode=map
<http://localhost:9090/cgi-bin/mapserv.exe?map=C:%5CAsif%5Cwork%5Cdevtools%5CMMS%5Cms4w%5CApache%5Chtdocs%5Cmapdemo%5Cdemo.map&mode=map>
) and the error I am getting now is - msLoadMap(): Premature
End-of-File.
I ran the GDAL tile cache command on a .tif image to create the shape
files using (gdaltindex doq_index.shp doq/*.tif). Also, I made some
changes in the map file. Attached is the most updated map file along
with the shape files.
Could you please take a look at it.
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Tuesday, October 28, 2008 1:22 PM
To: Asif Memon
Subject: Re: [mapserver-users] RE: Documentation for serving large
raster images using tile cache.
Sorry I assumed that the index.html file was the one that came with
TileCache. Is that not correct?
--
On Tue, Oct 28, 2008 at 1:02 PM, Asif Memon <mmemon at sdsc.edu> wrote:
Thanks for your reply.
Attached is the map file. I do not have the any tilecache.cfg file. From
the error(msLoadMap(): Unable to access file. (/path/to/demo.map)), it
appears the map file is not accessible.
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Tuesday, October 28, 2008 12:53 PM
To: Asif Memon
Cc: mapserver-users at lists.osgeo.org
Are you able to view a map when you go to
"http://localhost:9090/cgi-bin/mapserv.exe?map=/path/to/itasca.map&mode=map"
? Also, can you send a copy of your mapfile, and of your tilecache.cfg
files?
Roger
--
On Tue, Oct 28, 2008 at 11:15 AM, Asif Memon <mmemon at sdsc.edu> wrote:
Hi Roger,
I followed the instructions on the documentation and setup the map
server and demo, when I try to execute the index.html, I get this error
- msLoadMap(): Unable to access file.
(http://localhost:9090/mapdemo/itasca.map)
Do you know what could be it?
Sincerely,
Asif Memon
From: Roger André [mailto:randre at gmail.com]
Sent: Monday, October 20, 2008 1:38 PM
To: Gregor Mosheh
Cc: Asif Memon; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] RE: Documentation for serving large
raster images using tile cache.
Hi Asif,
Best thing to do is take a look at these 2 docs first:
- http://mapserver.gis.umn.edu/docs/howto/raster_data
- http://tilecache.org/readme.html
Once you have the ability to see your raster in MapServer via a
"mode=map" request, then you will have to decide how you wish to view
your data afterwards. There are different things to do in TileCache
depending on whether you wish to view the data in OpenLayers, or over
Google Maps/MS VE.
--
On Mon, Oct 20, 2008 at 12:01 PM, Gregor Mosheh <gregor at hostgis.com>
wrote:
Asif Memon wrote:
Could someone please point me to the documentation for serving large
(2GB to 3GB) raster images using tile cache. I want to use Minnesota Map
Server and GDAL to achieve this.
You'll want to ask the TileCache list about that, likely. Once you have
MapServer actually serving up the imagery, get your client using
MapServer or WMS (I like OpenLayers, myself). Then install TileCache and
change the OL app to use TC's URL instead of MapServer's. Easy.
But you may want to install OpenLayers and get it working with MapServer
first, then hit up the OL and TC mailing lists.
--
Gregor Mosheh / Greg Allensworth BS, A+, Network+, Security+, Server+
System Administrator, Lead Programmer
HostGIS development & hosting services, http://www.HostGIS.com/
"Remember that no one cares if you can back up,
only if you can restore." - AMANDA
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