[OpenLayers-Users] RE: mytopo layer for USGS topo insead of terraservice?

[geoffff]

Hi Jennifer -

 

You've got Geoff here, not Bryan - but let me try to help.

 

Well, the Mytopo server doesn't seem to be working for me either right
now - I get blank tiles right now, even with Mytopo's own website
http://www.mytopo.com/maps/

 

It was working when I tried it a few days ago.

 

Once the Mytopo website is back up again, if you are still getting blank
tiles, the next thing to look for is to make sure your tile requests
(the ones getting generated by your Javascript code) look correct.  What
I did is to use a web header sniffer like the "Live HTTP headers"
Firefox plug-in, to make sure the tile requests my code was making
matched those of mytopo.com and its customers - when looking at the same
lat/lon location.  

 

This is an example tile request:

 

http://maps.mytopo.com/digital-topo/tilecache.py/1.0.0/topoG/12/714/2578
.png 

 

http://maps.mytopo.com/
<http://maps.mytopo.com/digital-topo/tilecache.py/1.0.0/topoG/12/714/257
8.png> <your_api_key>/tilecache.py/1.0.0/topoG/12/714/2578.png 

 

Otherwise, I'm not really an expert on Openlayers.  I switched to the
Google maps API soon after making my posting below.

 

-- Geoff

 

 

 

From: Jennifer Maher [via OSGeo.org]
[mailto:ml-node+6509944-1839149915-300551 at n2.nabble.com] 
Sent: Thursday, June 23, 2011 1:41 PM
To: geoffff
Subject: Re: mytopo layer for USGS topo insead of terraservice?

 

BMcBride <bmcbride at ...> writes: 


> Hi Geoff, 
> 
> I have used MyTopo tiles in OL with no problems.  Follow MyTopo's 
> instructions here:  http://www.mytopo.com/google/index.cfm
> http://www.mytopo.com/google/index.cfm  to receive an API key.  The
easiest 
> way to load the tiles is to simply make a WMS request to the TileCache
like 
> so: 
> 
> var mytopo_tms = new OpenLayers.Layer.WMS( 
> "MyTopo", "http://maps.mytopo.com/<your_api_key>/tilecache.py", 
> {layers: 'topoG', srs: 'EPSG:900913', format: 'image/jpg', 
> transparent:true}, 
> {isBaseLayer: true, singleTile: false, opacity:1, attribution: ' 
> http://www.mytopo.com Topo maps provided by provided by MyTopo.com '} 
> ); 
> 
> ----- 
> Bryan R. McBride, GISP 
> http://www.bryanmcbride.com bryanmcbride.com 
> http://geoserving.net/ geoserving.net 



Bryan, 

I am trying to set up a map to work with MyTopo maps, OSM, Google
Terrain and 
Google Satellite.  Will this work?  I have tried your code (inserting my
own 
MyTopo API key) but I get blank tiles on the MyTopo layer.  Could this
be a 
problem with the projections, which I admit I do not really understand? 

Thanks, 
Jennifer 


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