|
Continuous
Fields Tree Cover Project AVHRR
|
|
Available
at:
|
http://glcfapp.umiacs.umd.edu:8080/esdi/index.jsp
|
|
Data
reference:
|
University of Maryland, Global
Land Cover Facility (GLCF) |
|
Year:
|
2000
|
| Version: |
1.0
|
|
Available
data products:
|
|
Products
|
Global and
continental (Africa, Asia-Pacific, Eurasia, North
America, South America)
map for proportional cover for three vegetation characteristics:
-leaf form
(woody vegetation, herbaceous vegetation, bare ground cover)
-leaf
type (needleleaf, broadleaf)
-leaf
longevity (deciduous, evergreen) |
Products
|
Projection
|
Global
|
Interrupted Goode Homolosine
Geographic (Lat/Long) |
|
Africa,
Asia-Pacific, Eurasia, North
America, South
America
|
Interrupted Goode Homolosine
Geographic (Lat/Long) |
|
Scale/spatial
resolution:
|
1km
|
|
Classification
system:
|
Proportional
cover scale
IGBP based land cover classification |
|
Remote
sensing data:
|
AVHRR
(1992-93)
|
Interpretation
process:
|
Automated
classification procedure
Using training data and phenological
metrics with a regression tree to derive
global percent cover
Using Landsat MS images to
train the linear mixture models for vegetation
characteristics permitting estimation of endmember
values
The spectral response of the AVHRR data is then unmixed
using the
endmembers and estimates of leaf longevity,
leaf type and percent tree cover
are identified
|
|
Projection:
|
Interrupted
Goode Homolosine and Geographic (lat/long)
|
Objective:
|
To develop
methodologies for global representation of vegetation
characteristics and to produce
continuous fields of vegetation characteristics
at 1km which are accessible to the global change research
community |
File
Format:
|
Binary, BSQ,
Ascii Grid (for continental
products only)
|
|
Data
release
policy:
|
Open access
|
|
Costs:
|
For free
|
Updates:
|
No
information, improved continuous field products based on MODIS data
|
Contact:
|
John Townshend, University of Maryland
(jt59@umail.umd.edu) |