On Monday, 04 July 2011, at 21:28:03 +0200,
Oliver Eichler wrote:

> I have to admit I do not really understand what you are doing. Sorry. 
> But I guess you try to work around those "no map" gaps in the google 
> satellite xml. Today I received a version of that XML, that does not 
> fail to load level 1 and all intermediate levels. It's uploaded to the 
> server. Maybe that solves all your problems.
> 
Well, I think the XML you are referring to is the one I sent you yesterday
:-) And what you say is exactly was I was trying to do: workaround the fact
that, in some areas, the Google layers don't have the requested detail
level (zoom levels 18, 19 and 20 are missing).When you try to get the maps
from the server, it answers with HTTP 404 error to every request, the QLGT
user interface stays unresponsive, you know.

As you can't know in advance which areas have tiles for every zoom level,
and (so far) QLGT / GDAL are unable to deal cleanly with the errors from
the remote server, I was trying to trick QLGT into avoiding querying the
remote server for WMS / TMS zoom levels that don't exist. So, after some
trial and error, I was trying to create a QMAP that for zoom levels at or
below the ones that generate queries for non existant zoom levels on the
server, QLGT just shows the last good zoom level (the last with a defined
map), or scales the layer from the last zoom level accordingly.

I know these are corner cases and ways to workaround possibly badly defined
XML map files, so don't pay too much attention to me.

> To get maximum fun out of it, I added a checkbox in the status bar, that 
> allows you to switch off quadratic zoom on-the-fly. It's all in svn.
> 
Great, useful when you need intermediate zoom level for a while but want to
use quadratic for regular map downloads.

> Yes, that is kind of very limited. I changed it to 2^17 = 131072.
> 
Verified that now the highest zoom level spans the whole Earth.

Big thanks to all of you for your effort.

Greetings,

-- 
Jose Luis Domingo Lopez
Linux Registered User #189436     Linux Kubuntu 11.04 (Linux 
2.6.38-8-generic-pae)

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