= GNSS Base station repositories =

Here are some sites that you can look at to find GPS (GNSS) base stations for use in differential GPS processing.

 1. [http://smartnet.leica-geosystems.co.uk/SpiderWeb/SmartNet/smartnet.html Leica SmartNet] - Download OS base station data for the UK
 1. [http://igscb.jpl.nasa.gov/ IGS] - Global station network, but sparse
  * [http://igscb.jpl.nasa.gov/network/list.html Station list]
 1. [http://www.unavco.org/ UNAVCO] - Global, permanent and campaign stations, sparse
  * [http://facility.unavco.org/data/dai2/app/dai2.html# Station search app]
 1. [http://www.eupos.org/ EUPOS] - Central/Eastern European network - regional coverage only but dense.
  * [http://www.eupos.hu/EUPOS-ESDB.php Station database]
  * [http://www.eupos.hu/map_out.php Station map]
 1. [http://www.trimble.com/findtrs.asp Trimble reference station list] - some overlap with IGS, global but sparse again