Richard,
Adding bgcolor really help to understand wich tiles are provided (some empty) and at wich speed. A simple way test what is exactly transmitted from NRCAN server and to document different essays with the map is to provide the Instruction transmitted to NRCAN including BBOX. Example for Marbre Mountain at zoom level 10 with bgcolor=0xCC00CC. http://wms.sst-sw.rncan.gc.ca/wms/toporama_en?REQUEST=GetMap&SERVICE=wms&VERSION=1.1.1&EXCEPTIONS=application/vnd.ogc.se_inimage&SRS=epsg:4326&BBOX=-71.2779,45.1598,-70.7286,45.4977&WIDTH=800&HEIGHT=800&bgcolor=0xCC00CC&FORMAT=image/png&LAYERS=WMS-Toporama Projection vs tile size Im am not familiar with all the details of how Projecion information is treated. But the following GETMAP instruction wiht Tilesize of 1000 does not show the same problem as you obtain thru WMS Client. http://wms.sst-sw.rncan.gc.ca/wms/toporama_fr?REQUEST=GetMap&SERVICE=wms&VERSION=1.1.1&EXCEPTIONS=application/vnd.ogc.se_inimage&SRS=epsg:4326&BBOX=-106.1719,19.8081,-35.8594,62.9952&WIDTH=1000&HEIGHT=1000&FORMAT=image/png&bgcolor=0xCC00CC&LAYERS=SCW-Toporama For the Place names and Background showing through problems it a good idea that you submit the problem to NRCAN. I hope to get this information organized and email it to the folks at NR Canada. I know of one friend who has already sent something in and he received a very fast and thorough response. There is a problem to overlay with USA topo maps. You could still use &TRANSPARENT=true, but the USA topo map overlaps in Canada particularly north of Marble Mountain. Pierre On 15 sep, 12:41, Papa Bear <[email protected]> wrote: > PierreB <[email protected]> wrote: > > ... > > > In the meantime I found that the WMSToporamaService provides maps > > for all the zooms levels. The problem seems more one of Response-Time. > > I wrote to RNCAN to see if it comes from their server. I succeed to > > have map or some tiles at zoom levels 3 and 4. From 5 to 10, I rarely > > obtain tiles. > > > PierreB > > I have experimented with these zoom levels from zoom=3 all the way > into zoom=11 (and beyond). > > First I set the background color to bright red, so I could distinguish > missing tile layers (background shows but no map layers) from simple > lack of response. > > Availability of map layers > > 1) I got map layers all the way from z=3 to z=8. (some were very > slow) These layers contain no topographic information but are general > maps with province boundaries, roads, cities, etc. > 2) I got no layers at all for z=9 and z=10 (only background). I waited > till my status bar (on FF) said "Done". > 3) Got the topographic maps already observed from 11 to 18. > > Projection vs tile size > > 1) with tile size=1000 (largest supported according to the web page) > and zoom= 3 or 4 the projection was off by up to 1000 miles. I gave > up and went to size=256. > 2) with tile size =256 and zoom=3 to 8 the alignment with a known > point (surveyed triangulation point) was close but still noticeably > off at certain zoom levels. On the topographic maps (zoom >= 11) the > location is spot on. > > Place names: > Many place names were truncated on the left when the name was near the > US border (to the right) but not truncated on the right in the > opposite case. > > Background showing through: > There are many areas in the topographic area (zoom >= 11) where the > background shows through. This may be intentional, but since the > background color is variable and set by the user it gives bizarre > results. I would say there should have been another layer with the > desired color behind these holes, > > Mirror site: > No help at all. It returned nothing > > Instead of a link, I've made a number of screen shots: > Screen Shot album > link:http://picasaweb.google.com/papabear.newyork/CanVecGMaps# > > Specific examples: > > Projection problem - notice where the marker is - it should be on the > border with Maine east of Sherbrooke. > zoom=4, tile > size=1000http://picasaweb.google.com/lh/photo/9ebJjsn97ndcBEHtjA1NWA?feat=dire... > zoom=4, tile > size=256http://picasaweb.google.com/lh/photo/VJmoffti39ZnGhCcJ14rZg?feat=dire... > A vast improvement but still slightly off. If you switch to Google > "Normal map" it's much better. > > Place > names:http://picasaweb.google.com/lh/photo/ubfcz5gqY0_7GSr81vYYtQ?feat=dire... > Notice "Fredericton" in New Brunswick is truncated to "dericton" but > "Woodstock" is OK. Other examples are in other screen shots. > > Empty spots on the topographic maps with background showing through: > zoom=11http://picasaweb.google.com/lh/photo/kNFIYR---4huCEUCDuJZOA?feat=dire... > zoom=16http://picasaweb.google.com/lh/photo/uS-Zjg2lm59dWLK3RCELVA?feat=dire... > > I hope to get this information organized and email it to the folks at > NR Canada. I know of one friend who has already sent something in and > he received a very fast and thorough response. > > One last general question: is there a way to set the background to be > transparent? If I could do that, I could overlay these maps on top of > the USGS topos and get native topographic maps on both sides of the > border. In other words, the NRCan maps would cover the USGS topos in > Canada, but not in the US where NRCan produces no layers (at least for > zoom >= 11). > > Regards > Richard aka Papa Bear --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en -~----------~----~----~----~------~----~------~--~---
