References
CRISP, 2001. Centre for Remote Imaging, Sensing and Processing. Interpreting optical remote sensing images. http://www.crisp.nus.edu.sg/~research/tutorial/opt_int.htm
Chrisman, N. 1997: Exploring Geographic Information Systems. John Wiley and Sons, USA.
Eyes to the Sky II, 2011. GIT Web Course. http://serc.carleton.edu/eyesinthesky2
esri, 2012. http://www.esri.com/software/arcgis
Heywood, Cornelius and Carver (2006). An introduction to Geographical Information Systems, 3rd Edition. Pearson Education Ltd. Essex, England.
Statistics NZ, 2012. http://www.stats.govt.nz/