New Zealand Plant Protection 55 (2002): 95-98
The spatial distribution of gorse in the Wellington Region was mapped using Landsat satellite imagery. This satellite is capable of mapping at regional scales (1:50 000), with a large spatial extent (180 km x 180 km), and has spectral bands in both the visible and infrared parts of the spectrum (6 bands in total). A spring Landsat image distinguished flowering gorse, enabling mapping of gorse as a separate scrub type. We chose a minimum patch size of 0.5 ha with a boundary precision of ±15 m. An error assessment using 1200 stratified random samples across the Wellington region compared the satellite classified result with colour aerial orthophotography and found the mapping accuracy of gorse to be 95%. Gorse area by catchment was calculated using an existing GIS of catchment boundaries. The area and percent cover of gorse within a catchment is a potential way to target management at regional scales.
Keywords: Ulex europaeus, monitoring, scrub weeds, satellite.
|Monitoring scrub weed change in the Canterbury region using satellite imagery|
J.D. Shepherd, J.R. Dymond and J.R.I. Cuff (2007)
New Zealand Plant Protection 60: 137-140
Copyright © 2002 New Zealand Plant Protection Society (Inc.).