METADATA FILE

I.  General description of data set
-----------------------------------

Name
	Pasture Lands for Baltic Sea drainage basin region

Geographic Level
	Regional

Specific Area
	Baltic Sea drainage basin region

Lat/Long Region Boundaries
	NW-X:           0-E     ,       SW-X:           0-E
	NW-Y:           75-N    ,       SW-Y:           45-N
	SE-X:           40-E    ,       NE-X:           40-E
	SE-Y:           45-N    ,       NE-Y:           75-N

Infoterra Keyword(s)
	Agriculture (17000)

Other Keyword(s)
	Pasture land, Grazing land

Primary Data Acquisition Period
	Start Date: 1987
	End Date: 1993

Supplier
	GRID-Arendal. PO Box 1602, Myrene. N-4801 Arendal, Norway.

Contributor
	GRID-Arendal. PO Box 1602, Myrene. N-4801 Arendal, Norway.

Publication Reference
	Langaas, S. 1993.  Some Georeferenced Data Sets for use within 
		Sub-project 1; Land Use and Ecological Carrying Capacity, 
		of the Baltic Drainage Basin Project.  Technical Note. 
		GRID-Arendal. 10 pages + apps.

	Sweitzer, J., Langaas, S., and Folke, C. 1996.  Land Cover and 
		Population Density in the Baltic Sea Drainage Basin: A GIS 
		database. AMBIO 25(3): 191-198.

Documentation (overview)
		The Baltic Sea drainage basin Agricultural data sets were
	derived from two principle sources:  (i) the IDRISI Baltic Sea Land
	Cover image, more specifically, the Open Land class, and (ii)
	national official statistics on agricultural land for first order 
	sub-national administrative regions.  This was obtained for all 
	countries except Belarus and the Baltic States for which only 
	national statistics were obtained.  Agricultural land was divided 
	into two categories, Arable Lands and Pasture Lands.  These data 
	sets are provided separately.  For those interested in total 
	agricultural, the two images simply need to be added.
		The methods used to create the Arable Lands and Pasture
	Lands data sets consisted primarily of three steps. Note: all three
	steps were performed independently for Arable and Pasture Lands.
	First, for each statistical region, the total agricultural land 
	within each region (either arable of pasture land) was divided by 
	the Open Land area from the Land Cover image, for the same 
	statistical region.  This fractional value represents the probability 
	of having agricultural land in a particular Open Land grid cell.  
	Second, the fractional values generated from step one were assigned 
	to the corresponding grid cells in the Open Land IDRISI image.  
	Finally, to smooth the data, the final images (Arable and Pasture) 
	were aggregated into 10 km x 10 km cell sizes.
		An added item called PERCENT is found in each coverage.
	This integer value represents the percent of arable land within a
	given polygon unit.  Note:  All 'no data' polygons are coded
	percent = 150.  This was done to distinguish between 0 percent
	and 'no data' polygons.
		The IDRISI Arable and Pasture Land images were converted 
	into ARC/INFO vector coverages, for PC ARC/INFO uses.  Due to 
	ARC/INFO limitations concerning number of arcs per polygon, the 
	images were divided into four tiles.  For those ARC/INFO users 
	that are not affected by such limitations (i.e., ARC/INFO 7.0), 
	then we suggest to convert the ARABLE.GIS and PASTURE.GIS 10 km 
	resolution ERDAS 7.4 files into complete, continuous vector 
	coverages.
	
************************************************************************
Contact information
	Hugo Ahlenius                           phone:  +47-370-35650 
	UNEP/GRID-Arendal                       fax:    +47-370-35050 
	                                        e-mail: mapmaster@grida.no
	
   

II.  Detailed description of data set (members)
-----------------------------------------------

Data set type
	IDRISI 4.1 image file

Description
	Pasture.IMG - Pasture Lands for whole Baltic region

File Type/Size
	Byte/packed binary (run-length encoding):  36 KB

Access
	Free access, unrestricted

Copies (available sites)
	CD-ROM - being distributed by GRID-Arendal
	World Wide Web (WWW), GRID-Arendal
		URL:  http://www.grida.no/


III.  Technical information about raster data
---------------------------------------------

Cell Size
	Height: 10,000 meters
	Width:  10,000 meters

Number of Rows
	260

Number of Columns
	200

Projection Name
	Lambert Azimuthal Equal Area

Projection Parameters
	Units: meters
	Spheroid: International 1909
	Radius: 6,378,388
	Longitude of centre of projection: 20.00.00
	Latitude of centre of projection:  60.00.00
	False Easting: 0
	False Northing: 0

Projection boundaries
	Xmin: -1,000,000        Ymin: -1,300,000 
	Xmax:  1,000,000        Ymax:  1,300,000