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CyberTracker Used for
Ground Truthing of Satellite Images A large-scale project initiated by the European Commission in the early 1990’s, the TREES (Tropical Ecosystem Environment observations by Satellite) project is dedicated to the development of techniques for global tropical forest inventory using satellite imagery. One of the objectives was to create maps to document the extent of dense tropical forest on a continental scale. Mapping dense humid forest, fragmented forest and non-forest make it possible to identify deforestation hot spots. Reliable analysis of satellite radar images is limited by a lack of appropriate field observations. In particular, the useful parameters for radar signal modeling are quite specific and are not available in the ecological literature. To solve this problem it was decided to collect a series of parameters about the different types of forests, such as open forest, closed forest, or swamp forest.
To achieve this TREES worked in collaboration
with ECOFAC,
also funded by the European Commission. Field patrols conducted in the Odzala National Park, Republic of Congo, used CyberTracker to collect geo-referenced field data. An exhaustive list of different types of vegetation was integrated into the Odzala CyberTracker data capture screen sequence. Field observations collected by CyberTracker were transferred into an MS Access relational database and integrated in an ArcView Geographic Information System for spatial analysis. High-resolution satellite images of Odzala National Park vegetation overlaid with CyberTracker observations (coloured dots). Reference: Pascale Janvier and Philippe Mayaux. 2002. “Exploring the synergy between environmental geo-referenced field data and remote sensing spatial information in Central Africa”. |
