== Display Grids as Overlay Layers in Sahana Eden ==
Grid types
 * !Lat/Lon
  * Status: Done: We have a Vector layer added by cdauth
  * Q: Should we replace this with !OpenLayers.Control.Graticule?
 * UTM/MGRS (NB These aren't regular!)
Options:
 * WMS
  * http://earth-info.nga.mil/GandG/coordsys/gislayers/gislayers.html
 * KML
  * PHP code to create (inaccurate?): http://www.nearby.org.uk/google.html#17
   * Offline version: http://www.nearby.org.uk/blog/2007/06/19/mgrs-layer-for-google-earth-offline/
 * !TileCache
  * http://github.com/migurski/GridTile
   * Grid only at Low Resolutions
   * Grid fails in Spherical Mercator
MGRS calculations in JS (this file already in {{{static/scripts/gis}}} as used by the MGRS PDF finder:
 * http://haiticrisismap.org/js/usng2.js

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[wiki:BluePrint/GIS GIS BluePrints]