The Global Assessment of Human Induced Soil Degradation (GLASOD) Digital Database from UNEP/GRID-GenevaEntry ID: GNV00018_171
Abstract: The Global Assessment of Human Induced Soil Degradation (GLASOD) was conducted by the International Soil Reference and Information Centre (ISRIC) at Wageningen, The Netherlands, as commissioned by the United Nations Environment Programme (UNEP). ISRIC produced a 1:10 million scale wall chart in 1990 and subsequently produced a digital data set.
In essence, the GLASOD data base contains ... information on soil degradation within map units as reported by numerous soil experts around the world through a questionnaire. It includes the type, degree, extent, cause and rate of soil degradation. From these data, GRID produced digital and hardcopy maps and made area calculations. Further general and technical information can be found in the two documents mentioned below.
The digital GLASOD data set as processed by GRID is contained in four files:
GLSDOCO.TXT CALCAREA.AML GLSGEO.E00 GLSMOLL.E00
The first two files are text files:
- GLSDOCO.TXT contains a document that explains the contents of the digital GLASOD data set and is called "GLASOD, a Users Guide to the Global Digital Database'.
- CALCAREA.AML contains an ARC/INFO AML for recalculation of areas after overlaying has been done.
The next two files are the actual GLASOD ARC/INFO coverages (in uncompressed 'EXPORT' format):
- GLSGEO is referenced in geographic coordinates (decimal degrees latitude and longitude) centered over the Greenwich Meridian. This is a very common general reference system which is handled by most GIS and image processing systems.
- GLSMOLL is referenced in the Mollweide equal-area projection (the parameters are listed in the above-mentioned text file).
They can be read using the following ARC/INFO commands :
IMPORT COVER GLSGEO GLSGEO
IMPORT COVER GLSMOLL GLSMOLL
A second document entitled the "World Map of the Status of Human-Induced Soil Degradation; an Explanatory Note" (October 1990) is included in the package, and should be considered the source document when reference is made to the Global Assessment of Soil Degradation (GLASOD) data set.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: International Soil Reference and Information Centre (ISRIC
Dataset Title: Global Assessment of the Status of Human Induced Soil Degradation (GLASOD)
Dataset Publisher: International Soil Reference and Information Centre (ISRIC)
Data Presentation Form: mapOnline Resource: http://meta2.isric.org/geonetwork?uuid=9e84c15e-cb46-45e2-9126-1ca3...
Start Date: 1990-01-01
HUMAN DIMENSIONS > BOUNDARIES > POLITICAL DIVISIONS
HUMAN DIMENSIONS > INFRASTRUCTURE > CULTURAL FEATURES
LAND SURFACE > EROSION/SEDIMENTATION > DEGRADATION > SOIL DEGRADATION
LAND SURFACE > EROSION/SEDIMENTATION > EROSION
LAND SURFACE > SOILS > SOIL CHEMISTRY
LAND SURFACE > SOILS > SOIL CLASSIFICATION
LAND SURFACE > SOILS > SOIL FERTILITY
LAND SURFACE > SOILS > SOIL PRODUCTIVITY
OCEANS > COASTAL PROCESSES > SHORELINES
Quality First comprehensive soil degradation overview at global scale. First
comprehensive soil degradation overview at global scale.
The GLASOD database includes a topographic basemap or global template of
continental coastlines, islands and lakes, which GRID-Nairobi extracted from
... the digital version of GLASOD's 1:10 million wall map. All of the boundaries
that defined oceans and lakes were selected to create a new ARC/INFO coverage,
which was subsequently used as a basemap for all the maps in UNEP's World
Atlas of Desertification (see reference below). The global boundaries
template contains 306 polygons of four types, which are coded in the data set
as follows: 1) Oceans; 2) Lakes; 3) Continents; and 4) Islands. It is
available from GRID as a single ARC/INFO 'EXPORT'-format file comprising 1.7
Mb when uncompressed. While the original projection ISRIC used for the GLASOD
wall map was the Mercator to display the various continents with as little
distortion as possible, it is distributed by GRID in either the Van der
Grinten (a variation of Mercator) or the Geographic projection.
The GLASOD project has produced a world map of human-induced soil degradation
in three sheets at an average scale of 1:10M (Mercator projection). The map was
digitized afterwards and stored in GIS format with attribute database and
supplementary statistics on the extent and degree of degradation.
Distribution Format: ARC/INFO EXPORT
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Role: TECHNICAL CONTACT
Email: Hy.Dao at unep.org
Head of Metadata & Socio-Economics Unit
Postal Code: 1219
Wood et al, 2000, Analysis of Global Ecosystems: Agroecosystems, World
Resources Institute, Washington, D.C.
Oldeman, L. R., Hakkeling, R. T. A. and W. G. Sombroek. October 1990.
"World Map of the Status of Human-Induced Soil Degradation; Explanatory
Note". (The) Global Assessment of Soil Degradation, ISRIC and UNEP in
cooperation with the ... Winand Staring Centre, ISSS, FAO and ITC; 27 pages.
Deichmann, Uwe and Lars Eklundh. July 1991. "Global digital data sets for
land degradation studies: a GIS approach". GRID Case Study Series No. 4;
UNEP/GEMS & GRID; Nairobi, Kenya; 103 pages (mostly pp. 29-32). An
additional reference is UNEP's 1992 World Atlas of Desertification
(Edward Arnold, London, UK, 69 pages - see pages vii to ix).
United Nations Environmental Program, 1992, World Atlas of Desertification,
UNEP/GEMS and GRID, Nairobi, Kenya.
Creation and Review Dates
DIF Creation Date: 2005-12-27
Last DIF Revision Date: 2012-08-29