Home page  | about c-squares  | latest news  | resources  | specification  | c-squares mapper  | examples

Working c-square code

• A web-accessible, online lat/long to c-square converter - upgraded (February 2003) to handle lines, poly-lines, and filled polygons as well as point data

• A standalone, formula-based c-square encoder / decoder as a downloadable MS Exel worksheet (new! November 2005) - enter a lat/lon pair to get a c-square code, or enter a code to retrieve the bounding coordinates of the relevant square (will operate on your local machine, no network connection required)

• Sample source code for converting lat/long pairs to equivalent c-squares:
  
  
  • Tony Rees' original 2002 PL/SQL code as developed for CSIRO's MarLIN and CAAB systems
  • Tony Rees' upgraded (2003) PL/SQL code (handles an unlimited range of requested square resolutions)
  • Phoebe Zhang's Java code as currently used in maps plotted from OBIS Distributed Data Search
  • Eli Agbayani's ColdFusion template as currently available for maps plotted from FishBase searches (MS Word file)
  • A port of "get_csquare" to plsql for PostgreSQL, courtesy of Javier de la Torre (Spain)
  • A Ruby script for creating csquares, courtesy of Jamie Brough (UK) (for additional information refer http://github.com/broughcut/csquares/tree/master)
  • A Python 2.5 script to translate from lat/lon to c-squares, courtesy of Steve Henrichsen
  
  
  
• PL/SQL source code for decoding a supplied c-square code into its limits in latitude and longitude (includes a built in validation function as well)
• PL/SQL source code for standalone validation of a supplied c-square code or a c-squares string (two PL/SQL functions)
• A prototype click-on-a-map interface to generate and re-edit c-squares codes, in the Australian region (non-java version)
• Prototype click-on-a-map interface to generate and re-edit c-squares codes, in the Australian region (java version - under development, may crash your browser...)

Technical information regarding "c-squares"

• The "official" published c-squares system description (article in "Oceanography" magazine, March 2003)
      (.pdf format) ... ... ... [low res. - 0.5 Mb] ... [high res. - 8.5 Mb]
• The c-squares FAQ ("Frequently Asked Questions") page - which will be updated periodically, as required
• "c-squares-discuss" - the listserver for interested developers and/or implementers to exchange information or post enquiries relevant to c-squares. To join the list, send an email to c-squares-discuss-request@marine.csiro.au with the word 'subscribe' in the BODY of the email (note, anything in the subject line is ignored). Then, to post a message, send it to c-squares-discuss@marine.csiro.au (note, only persons currently subscribed to the list are able to send messages to this service).
  
  Archives of this list are available at http://www.cmar.csiro.au/dmr/listarchive/c-squares-discuss/.
• Version 1.1 (2005) of the c-squares specification
• A colour A4 poster/handout with information about c-squares (.pdf format, 670 Kb)
• The mapping utility (CMR c-squares mapper) which will display c-squares data "footprints" on a variety of base maps, accessible via the web

Global files of c-squares at resolutions down to 0.5 x 0.5 degrees - for download

• 648 10 x 10 degree squares (file size = 29 KB)
• 2,592 5 x 5 degree squares (file size = 129 KB)
• 64,800 1 x 1 degree squares (file size = 3281 KB)
• 259,200 0.5 x 0.5 degree squares (warning: file size = 14049 KB)
• **single .zip file containing all of the above** (file size = 2944 KB)

Powerpoint presentations

• An April 2002 Powerpoint presentation giving an overview of the c-squares concept and its application
• The May 2002 EOGEO Powerpoint presentation
• A 10-slide high level c-squares concept presentation (October 2002)
• US FGDC presentation (November 2002)
• C-squares indexing for a satellite data archive (for EOGEO 2004, June 04)
• C-squares indexing and mapping in the 2004 release of OBIS (for EOGEO 2004, June 04)
• Evolving concepts in the architecture and functionality of OBIS (for Ocean Bidiversity Informatics Conference, November 04)
• A 2-slide summary of C-squares workflow options for system architecture, April 2006
• A presentation on the 2006 (Version 3) c-squares mapper for the OBIS International Committee, Philippines, May 2006 (NB, this is a 12 MB file)
• A presentation on Spatial Indexing, Search, and Mapping for Species level Databases for AquaSpecies workshop, Philippines, May 2006
• A presentation on c-squares as a web mapping system for a seminar organised by the Australian Spatial Sciences Institute, March 2007 (NB, this is a 13 MB file)
• A presentation entitled Nested Grids: the c-squares global grid presented to the the PEMS (Platform for Environmental Modelling Support) demonstrator project, October 2007 (with Sept 2009 update)
• A presentation entitled Nested Grids: the c-squares global grid and its notation presented to the the inaugural ANZLIC National Nested Grids (NNG) workshop, September 2011