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Continuous
Fields Tree Cover Project MODIS
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Available
at:
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http://glcfapp.umiacs.umd.edu:8080/esdi/index.jsp
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Data
reference:
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University of Maryland, Global
Land Cover Facility (GLCF) |
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Year:
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2003
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| Version: |
1.0
|
|
Available
data products:
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|
Products
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Percentage
cover for Treecover, bare, and herbaceous
for each continent
Percent
cover of life form (woody vegetation, herbaceous vegetation, or bare
ground), leaf type (needleleaf or
broadleaf) and leaf longevity (evergreen or deciduous)
Global and continental (Africa, Oceania,
Eurasia, North America,
South America)
products
MODIS Vegetation Continuous Fields product (MOD44)
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Products
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Projection
|
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Africa, Oceania, Eurasia, North America, South America
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Interrupted Goode Homolosine
Geographic (Lat/Long) |
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Scale/spatial
resolution:
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0,5km
|
|
Classification
system:
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Proportional
cover scale
IGBP based land cover classification |
|
Remote
sensing data:
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MODIS/TERRA
(2000-2001)
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Interpretation
process:
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Automated
classification procedure using a regression tree algorithm
Using high-resolution imagery (Landsat
ETM+, IKONOS) to derive global training data
Using training data as dependent variable, predicted
by independent variables in form of
annual MODIS metrics
Employing these training data and phenological
metrics with a regression tree to derive
global percent cover
Outputs from the regression tree are further modified by
stepwise regression and bias
adjustment |
|
Projection:
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Interrupted
Goode Homolosine and Geographic (Lat/Long)
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Validation:
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Interpretation
of field data along with IKONOS and Landsat
ETM+ data
Establishment
of test areas with size of an ETM+ image
Crown cover
maps of IKONOS images are binned to ETM+ cells to map percentage crown
cover for 30m pixel
The retrieved ETM+ crown cover map is averaged to a 500m resolution to validate the
MODIS map |
Objective:
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To support
change detection studies at the global scale
To continue
with and improve the continuous fields product series, formerly
retrieved from
AVHRR data now using more detailed spatial/spectral
characteristics of the MODIS data |
File
Format:
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GeoTIFF
|
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Data
release
policy:
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Open access
|
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Costs:
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For free
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Updates:
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intended
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Contact:
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John Townshend, University of Maryland
(jt59@umail.umd.edu) |