TEC - West Coast Region, New Zealand

The aim of this case study was to identify the status of LENZ environments within the West Coast Regional Council area through the use of the TEC tool. The wider aim was to provide a quantitative assessment of the degree of indigenous cover remaining in the West Coast Region including the Buller, Grey and Westland Districts.

The Threatened Environment Classification Tool (TEC) is a freely available simple and practical GIS too which is an extension of the Land Environments of New Zealand (LENZ) Classification; it has been used in this case study to assess the status of threatened environments on the west coast of New Zealand.  The study has potential to be of value in enhancing future policy development along the West Coast.

In the assessment the study used the 500 level 4 LENZ environments, the 2006 regional and District Council boundaries from the LINZ database (via Statistics New Zealand), and an in-house Protected Areas dataset compiled in July 2008 from Department of Conservation, QEII covenants, and a number of regional parks. The LCDB2 was used to determine Indigenous cover.           

The results illustrated that the West Coast Region has only 2.3% of its area within LENZ Level IV environments that are classified as one of the five ‘threatened environments’ (i.e. either Acutely Threatened, Chronically Threatened, At Risk, Critically Underprotected or Underprotected) against a national mean for regions of 45%. Of the 86 LENZ level IV Environments in the West Coast, 11 would be classified as ‘threatened environments’.


There are no LENZ Environments in the West Coast region in the category with the highest level of threat (Acutely Threatened: < 10% indigenous vegetation left). In conclusion, much of the area of the West Coast Region is of LENZ environments classified as “Less Reduced and Better Protected” nationally.

This means that relatively high proportions of the LENZ environments in the West Coast Region retain some form or indigenous cover, and most have legal protection across > 20% of their land area. Within the West Coast Region, the Buller District contains all the remaining (identified) indigenous cover of land that falls within environments that are nationally classified as ‘threatened environments’. There are similar areas of indigenous cover of At Risk environments in each of the districts. Recommendations A number of environments of limited extent or vulnerable nationally may warrant further protection. A spatial investigation of the remaining Indigenous Cover in these LENZ environments may be warranted. Data suitable for such a study have been prepared during this study but fell outside the scope of the project.

Associated Models

Threatened Environment Classification (TEC tool)

The Threatened Environment Classification is an interactive GIS tool which helps planners identify and set a value on New Zealand‘s threatened environments.


Price, R. & Briggs, C. (2008) Threatened Environment Classification for the West Coast Region, New Zealand. Landcare Research Contract Report: LC0809/076, 16p. Prepared for Envirolink.

Walker, S., R. Price, D. Rutledge, R. T. T. Stephens, and W.G. Lee. (2006). Recent loss of indigenous cover in New Zealand. New Zealand Journal of Ecology 30: 169–177