[Tilecache] Clue Please - TileCache won't make Polar Tiles for OpenLayers

[ScottCh]

Hi All,

I am attempting to use tilecache.py, GSHHS shapefiles, and Mapserver to
create Arctic polar stereographic tiles for OpenLayers.  

My Mapserver map file appears to work.  It displays a polar map image for
EPSG:3995 correctly when I create a PNG image on my web browser:

<http://osgeo-org.1560.x6.nabble.com/file/n5088297/maps-r-us.png> 

I display this via apache using the URL: 
http://localhost/maps/mapserv?MAP=/var/www/maps/gshhs_polar.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=GSHHS_f_L1,GSHHS_f_L2,GSHHS_f_L3,GSHHS_f_L4&STYLES=&BBOX=-6486320.82608643,-6485942.31407885,6486655.95236211,6486510.25174298&SRS=EPSG:3995&WIDTH=800&HEIGHT=800&FORMAT=image/png

Unfortunately this is as far as I have gotten.  When I use
*tilecache_seed.py* to create tiles, they are all blank.  I have read
everything I can find including dozens of forum postings.  Nothing has
helped yet.

This is my tilecache.cfg file:

[gshhspolar]
size=256,256
type=WMSLayer
url=http://localhost/maps/mapserv?MAP=/var/www/maps/gshhs_polar.map
#layers=GSHHS_f_L1,GSHHS_f_L2, GSHHS_f_L3, GSHHS_f_L4, WDBII_border_f_L1,
WDBII_border_f_L2&STYLES
layers=GSHHS_f_L1,GSHHS_f_L2,GSHHS_f_L3,GSHHS_f_L4,WDBII_border_f_L1,WDBII_border_f_L2
#bbox=-180,60,180,90
#bbox=-6486320.82608643,-6485942.31407885,6486655.95236211,6486510.25174298
#bbox=-20037508.342789244,8399737.8898183592,20037508.342789244,238107693.26496765
#bbox=-0.0000,0.0000,0.0000,3333134.0276
srs=EPSG:3995
#projection= +proj=stere +lat_0=90 +lat_ts=-71 +lon_0=0 +k=1 +x_0=0 +y_0=0
+ellps=WGS84 +datum=WGS84 +units=m +no_defs
extension=png
description=GSHHS Polar Stereographic Map
extent_type=loose
#maxresolution=0.3515625
resolutions=0.3515625,0.17578125,0.087890625,0.0439453125
#resolutions=0.3515625, 0.17578125, 0.087890625, 0.0439453125,
0.02197265625, 0.010986328125, 0.0054931640625, 0.00274658203125,
0.001373291015625

As you can see many lines are commented out.  The bounding box changes and
other guesses are just some of the things I have tried, in the hours I have
spent attempting to get tiles that are not blank.

The only thing that has worked is when I change the projection back to
EPSG:4326 (WGS 84).  My original tile cache for OpenLayers was not polar. 
That one worked fine.

Since proj 4's "epsg" file on my system includes a listing for 3995, it
seems to me that I should not have to include a separate line to configure
it in the tilecache.cfg file.  I have it in the listing above but it is
commented out.  If I uncomment it, it has no effect.

I have not added my Mapserver map file here since it is rather long, but I
can paste it if it will help.  

Gracious thanks for any clues or expertise.  As you may have guessed I still
have plenty to learn about these tools!

Scott C.
Cary, NC USA



--
View this message in context: http://osgeo-org.1560.x6.nabble.com/Clue-Please-TileCache-won-t-make-Polar-Tiles-for-OpenLayers-tp5088297.html
Sent from the TileCache mailing list archive at Nabble.com.