Updating the Phase 1 habitat map of Wales, UK, using satellite sensor data
In: ISPRS journal of photogrammetry and remote sensing, Jg. 66 (2011), Heft 1, S. 81-102
academicJournal
- print, 3/4 p
Zugriff:
The Phase 1 Survey is the most comprehensive and widely used national level map of semi-natural habitats in Wales. However, the survey was based largely on field survey and was conducted over several decades, before being completed in 1997. Given that resources for a repeat survey were limited, this study has used an object-orientated rule-based classification implemented within eCognition of multi-temporal satellite sensor data acquired between 2003 and 2006 to map semi-natural habitats and agricultural land across Wales, thereby allowing a progressive update of the Phase 1 Survey. The classification of objects to Phase 1 habitat classes was undertaken in two steps; firstly the landscape of Wales was divided into objects using orthorectified SPOT-5 High Resolution Geometric (HRG) reflectance data (10 m spatial resolution) and Land Parcel Information System (LPIS) boundaries. A rule-base was then developed to progressively discriminate and map the distribution of 105 sub-habitats across Wales based on time-series of SPOT HRG, Terra-1 Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Indian Remote Sensing Satellite (IRS) LISS-3 data, derived datasets (e.g., vegetation indices, fractional images) and ancillary information (e.g., topography). The rules coupled knowledge of ecology and the information content of these remote sensing data using a combination of thresholds, Boolean operations and fuzzy membership functions. A second rule-base was then developed to translate the more detailed sub-habitat classification to Phase 1 habitat classes. Indicative accuracies of the revised Phase 1 mapping, based on comparisons with the later Phase 2 survey (for selected habitats), were >80% overall and typically between 70% and 90% for many classes. Through this exercise, Wales has become the first country in Europe to produce a national map of habitats (as opposed to land cover) through object-orientated classification of satellite sensor data. Furthermore, the approach can be adapted to allow continual monitoring of the extent and condition of habitats and agricultural land.
Titel: |
Updating the Phase 1 habitat map of Wales, UK, using satellite sensor data
|
---|---|
Autor/in / Beteiligte Person: | LUCAS, Richard ; MEDCALF, Katie ; BROWN, Alan ; BUNTING, Peter ; BREYER, Johanna ; CLEWLEY, Dan ; KEYWORTH, Steve ; BLACKMORE, Philippa |
Link: | |
Zeitschrift: | ISPRS journal of photogrammetry and remote sensing, Jg. 66 (2011), Heft 1, S. 81-102 |
Veröffentlichung: | Amsterdam: Elsevier, 2011 |
Medientyp: | academicJournal |
Umfang: | print, 3/4 p |
ISSN: | 0924-2716 (print) |
Schlagwort: |
|
Sonstiges: |
|