[mapserver-users] Precache

Fri Jun 19 14:48:55 PDT 2009

Hello,

I have got this (tilecache with mapserver on google maps) working
finally after a lot of problems but I now really need to know about
how to do a pre-cache of all the tiles from mapserver. I am running
tilecache 2.10 on Windows with mapserver ms4w from maptools.org. I
tried running "tilecache_seed.py" as per the suggestion above but it
always ends up in the following error

Traceback (most recent call last):
  File "C:\ms4w\Apache\cgi-bin\tilecache-2.10\tilecache_seed.py", line 9, in <mo
dule>
    TileCache.Client.main()
  File "C:\ms4w\Apache\cgi-bin\tilecache-2.10\TileCache\Client.py", line 153, in
 main
    layer = svc.layers[args[0]]
IndexError: list index out of range

Any help in this regard would be great.

Thanks,
Varun

On Fri, Jun 19, 2009 at 2:39 PM, Varun saraf<vsaraf.gmu at gmail.com> wrote:
> Hi Roger,
>
> I am trying to get my mapserver and tilecache work together but its
> somehow not working. I am using the same projection as you in all my
> layers and the mapfile. (This works when I call my mapserver directly
> from google and hence the projection is right).
>
> Here is my mapfile (Only things that might be important).
>
> MAP
>    EXTENT -173 5 -45 75
>
>    IMAGETYPE PNG
>
>    PROJECTION
>      "init=epsg:4326"
>    END
>
>    WEB
>    METADATA
>     wms_srs             "EPSG:4326 EPSG:900913"
>    END
> ....
>    END
>
>    LAYER
> ....
>        PROJECTION
>            "init=epsg:4326"
>        END
>    END
>
> Next I added the 900913 epsg to the proj.4 of mapserver and made the
> required changes in tilecache.cfg file as you specified.
>
> [google-tiles]
> type=MapServerLayer
> mapfile=C:/ms4w/apps/QCTGIS/drawMap.map
> metaTile=true
> metaSize=2,2
> metaBuffer=0,500
> layers=tr20_d00
> spherical_mercator=true
> srs=EPSG:900913
>
> I am not sure if the linkn I am using is wrong. I have tilecache
> installed in the cgi directory of the apache server that was installed
> using "ms4". The example index.html that comes with tilecache works
> fine and I can see the images being cached. Also my mapserver directly
> works fine. Can you tell me what is it that I am doing wrong here? the
> link I use for the tileUrlTemplate in google maps is
> "http://127.0.0.1:8123/cgi-bin/tilecache-2.10/tilecache.cgi/1.0.0/google-tiles/{Y}/{X}/{Z}.png?type=google".
> I can also see that this call gets initiated in the apache logs
> (access.log) but nothing happens therafter. I don't even know if this
> is failing at tilecache end and mapserver isn't being called at all or
> at mapserver's end where the image is not being sent by mapserver. Can
> you help me out here?
>
> Thanks a lot.
> Varun
>
> On Thu, May 21, 2009 at 12:46 PM, Roger André<randre at gmail.com> wrote:
>> Ahh, ok.  I'm not sure in what fashion you are using TileCache, but my
>> experience has been with using it to create tiles to display in Google
>> Maps.  Google Maps uses the projection which is EPSG:900913.  I
>> believe there are other codes for it, but that is the one I use.
>>
>> All of my source data for the MapServer projects I make are in
>> EPSG:4326.  So there are 3 things I need to do in order to make the
>> Tilecache output tiles align correctly in Gmaps.
>>
>> 1. I set both the mapfile and the layer projections to EPSG:4326.
>> MAP
>>  NAME  'v2_80m_global'
>>  PROJECTION
>>    "init=epsg:4326"
>>  END
>>
>>  LAYER
>>    NAME 'imagery'
>>    PROJECTION
>>      "init=epsg:4326"
>>    END
>> <snip...>
>>
>> 2. I explicity allow for a wms request to be made for the layer in
>> EPSG:900913 by setting the following in my MapServer LAYER:
>>    METADATA
>>      "wms_srs"             "EPSG:4326 EPSG:900913"
>> <snip...>
>>
>> 3. I define my TileCache layer so that it requests images from
>> Mapserver in EPSG:900913.
>> [v2_20m_global]
>> type=MapServerLayer
>> mapfile=/var/www/mapfiles/v2_20m_global/v2_20m_global.map
>> metaTile=true
>> metaSize=2,2
>> metaBuffer=0,500
>> layers=imagery
>> spherical_mercator=true
>> srs=EPSG:900913
>>
>> That's what works for me.
>>
>> Roger
>> --
>>
>> On Thu, May 21, 2009 at 5:24 AM, Chad Clabaugh <cclabaugh at centwire.com> wrote:
>>> Thank you Roger, for your response.  I have done that but I do not
>>> understand how tilecache works.  The images that are returned from mapserver
>>> line up perfectly. But the images returned from tilecache do not align very
>>> well (they're distorted).  If tilecache is simply caching the returned
>>> images then I do not understand where this distortion comes from.  Any
>>> thoughts?
>>>
>>> Thanks!
>>>
>>> -----Original Message-----
>>> From: Roger André [mailto:randre at gmail.com]
>>> Sent: Wednesday, May 20, 2009 11:46 PM
>>> To: Chad Clabaugh
>>> Cc: mapserver-users at lists.osgeo.org
>>> Subject: Re: [mapserver-users] Precache
>>>
>>> Your request is somewhat lacking in detail, but assuming that your
>>> goal is a simple one, here is one way to accomplish this.
>>>
>>> 1. Create a MapServer project that displays your shapefile in whatever
>>> style you choose.
>>> 2. Setup a TileCache instance that points to your MapServer project.
>>> 3. Run the tilecache_seed.py script to pre-generate tiles.
>>>
>>> Roger
>>> --
>>>
>>> On Wed, May 20, 2009 at 12:16 PM, Chad Clabaugh <cclabaugh at centwire.com>
>>> wrote:
>>>> How can I precache tile images from shapefiles?
>>>>
>>>>
>>>>
>>>> Thanks
>>>>
>>>>
>>>>
>>>> Chad Clabaugh
>>>>
>>>> Technical Support, Engineering
>>>>
>>>> Office: 260.760.6398
>>>>
>>>> Mobile: 260.466.8861
>>>>
>>>>
>>>>
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>>>> mapserver-users mailing list
>>>> mapserver-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>
>>>>
>>>
>>>
>>>
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