TREES Landcover Data for Venezuela (1996)Entry ID: TREES_Ven_GFW
Abstract: The new TREES map is derived from the ATSR-2 sensor (Along Track Scanning
Radiometer) onboard the ERS-2 Satellite from 1999-2000. The map represents
forest cover in 1996. The data are at 1 km2 resolution (0.009 degrees) and are
received in the 0.55, 0.65, 0.85, 1.6, 11, and 12 microns. The data can be
downloaded in near-real-time from the European Space Agency's ESRIN site. The
data are ... automatically remapped to Geographic (Plate Carre) projection using
the embedded geolocation points that come with the data. The data are
classified using an unsupervised clustering algorithm 'ISODATA'. Classes are
then assigned by expert interpretation. TREES classified forest type based on
elevation. We have chosen to aggregate lowland, submontane, montane, and
mangrove classes because of errors in topographical base data that
underestimate lowland forest cover. Dense forest (lowland, submontane,
montane, and mangrove) is defined as forest covering more than 70% within a 1
km2 pixel area. Fragmented forest is considered to be 40-70% forest cover
within a 1 km2 pixel area. We have clipped TREES data to our boundary layer
for Venezuela, and coded the fragmented forest layer to be "non-forest." We
chose to exclude fragmented forest from our representation of forest cover
because we sought to show closed canopy forest. In addition, the fragmented
forest class is less reliable, and can be easily confused with non-forest
vegetation by the ERS-2 satellite.
Data Set Citation
Dataset Originator/Creator: Tropical Ecosystem Environment Observation by Satellites (TREES)
Dataset Title: TREES Landcover Data for Venezuela (1996)
Dataset Release Place: Ispra, Italy
Dataset Publisher: European Commission
Data Presentation Form: raster digital dataOnline Resource: http://www.globalforestwatch.org/english/datawarehouse/index.asp#Ve...
Start Date: 1996-01-01Stop Date: 1996-12-31
ISO Topic Category
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Data Set Progress
Distribution Media: online
Distribution Size: 95 KB
Distribution Format: shapefile
Fees: No fees
H. Eva and S. Jones, A forest map of South America (Ispra, Italy: Tropical
Ecosystem Environment Observation by Satellite (TREES), unpublished data).
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-04-28
Last DIF Revision Date: 2017-08-24