Re: [Paparazzi-devel] Google Maps are not downloading

[Matthew Currie]

Pascal,


Great.  Thanks for the fix!

The paparazzi gods are against me this weekend for my maiden flight.
There are only two external influences in this project.  Map tiles and
wind.  It  has not been as windy today as it has been in a while.
30km/h gusting 50.

I figure it is a sign and will start double checking all my code =)


Cheers,
Matthew Currie

Pascal Brisset wrote:
> Hi,
> 
> it seems that the Google naming policy for tiles  has changed. I did not
> find any documentation about it.
> Looking at the requests from the standard Google Maps application, it is
> possible to forge the new names.
> Previously, the tiles were named according to quadtree coding using q
> (north-west), r (north-east), s (south-east) and t (south-west) to name
> a recursive split of the earth.
> Now the tiles are simply accessible giving a zoom level (z) and two
> coordinates, x (east) and y (south) from 0
> to 2^z-1 .
> 
> I've just commited a patch (sw/lib/ocaml/gm.ml).
> Since our caches (var/maps/) are full of maps named with the previous
> policy, I kept this naming. So, just a small translator for the URL has
> been added:
> 
> let google_maps_url = fun s ->
>  sprintf "http://khm.google.com/kh?n=404&v=3&t=%s"; s
> 
> has been modified into
> 
> let google_maps_url = fun s ->
>  let (x, y, z) = xyz_of_qsrt s in
>  sprintf "http://khm0.google.com/kh/v=45&x=%d&s=&y=%d&z=%d"; x y z
> 
> where xyz_of_qsrt translates "trtqtqsqqqqsrqrqrt" into (67690, 43073, 17)
> 
> so "svn update sw/lib/ocaml/gm.ml; make" should solve your problems
> 
> --Pascal
> 
> PS: Yes, we will use openstreetmap. Soon :-)
> 
> 
> 
> Matthew Currie wrote:
>> Yes, 404 is not a good sign.  The google server is actively and politely
>> responding and saying the tile you requested is not available.  We can
>> hope this is a temporary server change.
>>
>> I was going to do my first flight this weekend and I don't have the
>> tiles for my new flying site yet =/
>>
>> Matthew Currie
>>
>> Austin Jensen wrote:
>>  
>>> Anyone else having troubles downloading new tiles from Google. I get
>>> this error
>>>
>>> --2009-09-25 11:40:53-- http://khm.google.com/kh?n=404&v=3&t=tqtrstttqss
>>> <http://khm.google.com/kh?n=404&v=3&t=tqtrstttqss>
>>> Resolving khm.google.com... 74.125.155.190, 74.125.155.136,
>>> 74.125.155.93, ...
>>> Connecting to khm.google.com
>>> <http://khm.google.com>|74.125.155.190|:80... connected.
>>> HTTP request sent, awaiting response... 404 Not Found
>>> 2009-09-25 11:40:53 ERROR 404: Not Found.
>>>
>>> This is different than the error you get when the server bans you right?
>>> I've tried different computers from different locations and had the same
>>> problem.
>>>
>>> Thanks,
>>> Austin
>>>
>>> ------------------------------------------------------------------
>>> Austin Jensen, Research Engineer
>>> Utah Water Research Laboratory (UWRL)
>>> Utah State University, 8200 Old Main Hill
>>> Logan, UT, 84322-8200, USA
>>> E: address@hidden
>>> <mailto:address@hidden>
>>> T: (435)797-3315
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>> Paparazzi-devel mailing list
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>>
>>
>>
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> 
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