Cell Positions

http://spectrumonline.med.govt.nz/licence-search.html

Enter into LICENCE either:

telecom
vodafone

The main license types for cell phone base stations are SZ, SY, and SX (relates to transmit power, SZ is most common).

From here you can drill down to find LAT/LNG for each transmitter.

Google Maps - Quadtree tiling system

So Google and other online mapsite using a tiling system to transfer large images.

These images are cut into smaller ones, based on a nested hierachy.... known as Quadtree. Good explaination here


Google use q,r,t,s (0-3) to denote one of 4 corners of a tile.

So to find your location run this Python code....




Run it like this:

python googletiles.py 17 -43.525 172.616

Spherical Mercator (ESPG:900913) coordinates for lat/lon:
(19215525.222771712, -5392226.689463486)
17/128383/47899 ( TileMapService: z / x / y )
Google: 128383 83172
Quadkey: 31311030123311311 ( 14851095925 )


Substitute the QUADKEY values as follows
0=q
1=r
2=t
3=s

Then type that list of letters into this page...




Here's an example for Christchurch, NZ
http://pallit.lhi.is/bigice/makeme.php?startPic=tsrsrrqsqrtssrrsrr&hTiles=14&vTiles=14


___________
Other useful info on tiling

cut your own tiles - x,y info
http://makemeamap.com/cgi-bin/mercator4.pl

view tiles on one page
http://pallit.lhi.is/bigice/bigpic.html

how it works
http://www.maptiler.org/google-maps-coordinate-system-projection-epsg-900913-3785/

overlay on web your own image and create the tiles for it
http://open.atlas.free.fr/GMapsTransparenciesImgOver.php

use python to create a local cache of WMS tiles
http://www.tilecache.org/

Some Mapping links - most with source code included!

Display OpenStreetMap on a DEM!

http://wiki.openstreetmap.org/index.php/Kosmos#Download


- - - -
Adding MS VE to a .NET application!

http://blogs.msdn.com/virtualearth3d/archive/2008/04/19/creating-the-most-basic-windows-form.aspx


- - - -
3D and graphics tools

http://www.grime.net/gistools/

------

http://www.alpix.com/3d/TerrainViewer/index.html

3d mini terrain viewer

- - - -
http://blogs.msdn.com/coding4fun/archive/2007/10/18/5506286.aspx

connecting Wii to MS VE

The power of Folksonomies - Tags from FLickR shown on a map

Google Map Hacking

http://econym.googlepages.com/index.htm

Great set of examples and explanations for anyone working on Google Map hacking!

Open mapping sources

Two open map sources

http://www.openstreetmap.org/

http://openaerialmap.org/

Earth Bridge (GPS to Google Earth)

Earth Bridge... link GPS to Google Earth...
Takes standard NMEA output....

http://mboffin.com/earthbridge/