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ISLSCP II Continuous Fields of Vegetation Cover, 1992-1993
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Revision date: September 30, 2009

ISLSCP II Continuous Fields of Vegetation Cover, 1992-1993

Summary:

The objective of this study was to derive continuous fields of vegetation cover from multi-temporal Advanced Very High Resolution Radiometer (AVHRR) data using all available bands and derived Normalized Difference Vegetation Index (NDVI). The continuous fields describe sub-pixel proportions of cover for tree, herbaceous, bare ground and water cover types. For tree cover, additional fields describing leaf longevity (evergreen and deciduous) and leaf morphology (broadleaf and needleleaf) were also generated. The modeling of carbon dynamics and climate require knowing tree characteristics such as these. This data set consists of three zip files provided at three spatial resolutions of quarter, half, and one degree, each containing seven data files in standard ESRI ArcGIS ArcInfo ASCII Grid format for seven land cover classes. This data set describes the geographic distributions of three fundamental vegetation characteristics: tree, herbaceous and bare ground cover. For tree cover, leaf longevity and morphology layers were produced.

Additional Documentation

This data set is one of the products of the International Satellite Land-Surface Climatology Project, Initiative II (ISLSCP II) data collection which contains 50 global time series data sets for the ten-year period 1986 to 1995. A complete description of the data, their derivation, acknowledgements, and references provided by the ISLSCP II Data Management Staff is included with this data set as a companion file named 1_veg_continuous_fields_doc.pdf.

ISLSCP II is a consistent collection of data sets that were compiled from existing data sources and algorithms, and were designed to satisfy the needs of modelers and investigators of the global carbon, water and energy cycle. The data were acquired from a number of U.S. and international agencies, universities, and institutions. The data and documentation have undergone two peer reviews.

ISLSCP is one of several projects of Global Energy and Water Cycle Experiment (GEWEX) [http://www.gewex.org/] and has the lead role in addressing land-atmosphere interactions -- process modeling, data retrieval algorithms, field experiment design and execution, and the development of global data sets.

 

Data Citation:

Cite this data set as follows:

DeFries, R., and M.C. Hansen. 2009. ISLSCP II Continuous Fields of Vegetation Cover, 1992-1993. In Hall, Forrest G., G. Collatz, B. Meeson, S. Los, E. Brown de Colstoun, and D. Landis (eds.). ISLSCP Initiative II Collection. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/931

 

File Information:

The archived data sets for ISLSCP II have been organized by categories. This data set is in the vegetation category--a collection of vegetation and albedo data sets.

Data Set Spatial Extent: Global gridded

Western most Longitude: -180 W

Easternmost Longitude: 180 E

Northernmost Latitude: 90N

Southernmost Latitude: -90S

Projection: Geographic

Data Set Spatial Resolution: 1/4, 1/2, and 1 degrees in both latitude and longitude

Data Set Temporal Extent: April 1992 through March 1993

Data Set Temporal Resolution: Yearly


Data File Format:

All of the data files in each data set within the ISLSCP Initiative II data collection are in ESRI ASCII GRID format for ArcInfo. All files are gridded to a common equal-angle lat/long grid. The data files are grouped by spatial resolution. Each file has 6 header metadata rows.

      veg_cont_fields_1deg.zip: ncols360, nrows180, xllcorner-180, yllcorner-90 ,cellsize 1, NODATA_value -99


     veg_cont_fields_hdeg.zip: ncols 720, nrows 360, xllcorner-180, yllcorner-90, cellsize.5, NODATA_value -99


     veg_cont_fields_qdeg.zip: ncols 1440, nrows 720, xllcorner-180, yllcorner-90, cellsize .25, NODATA_value -99


Data Values:

All values are written as floating point values.

Missing values are assigned the value of -999.00 on all data layers.

Missing values over land are assigned the value of -88.

Data file naming conventions are described in the 0_veg_cont_fields_readme.txt

For each spatial resolution there are seven files describing the percentage, from 0 to 100, of the following global continuous fields, and xx is qd, hd, or 1d, denoting a spatial resolution of 1/4, 1/2 or 1 degree, respectively:

Layer Description Filename
1 Bare Cover bare_percent_xx.asc
2 Herbaceous Cover herb_percent_xx.asc
3 Tree Cover tree_percent_xx.asc
4 Water(ancillary data) no data file provided
5 Deciduous tree cover deciduous_percent_xx.asc
6 Evergreen tree cover evergreen_percent_xx.asc
7 Broadleaf tree cover broadleaf_percent_xx.asc
8 Needleleaf tree cover needleleaf_percent_xx.asc

 

Data Access:

These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC)  [http://daac.ornl.gov].

Data Archive Contact Information:

E-mail: uso@daac.ornl.gov
Telephone: +1 (865) 241-3952