[mapserver-users] Documentation for serving large raster images using tile cache.

Mon Nov 10 13:20:02 PST 2008

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 EXTENT to this:
  EXTENT  -0.9194182 -4.2013292 -0.9002422 -4.1870152

This 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

Subject: Re: [mapserver-users] RE: Documentation for serving large raster images using tile cache.

Hi Asif,

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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