[Location: Location_Category='OCEAN', Location_Type='INDIAN OCEAN', Location_Subregion1='BRUNEI']
Gridded Population of the World, Version 3 (GPWv3): Population Count GridEntry ID: CIESIN_SEDAC_GPWv3_POPCOUNT
Abstract: Gridded Population of the World, Version 3 (GPWv3) consists of estimates of human population for the years 1990, 1995, and 2000 by 2.5 arc-minute grid cells and associated datasets dated circa 2000. A proportional allocation gridding algorithm, utilizing more than 300,000 national and sub-national administrative units, is used to assign population values to grid cells. The population count grids ... contain estimates of the number of persons per grid cell. The grids are available in various GIS-compatible data formats and geographic extents (global, continent [Antarctica not included], and country levels). GPWv3 is produced by the Columbia University Center for International Earth Science Information Network (CIESIN) in collaboration with Centro Internacional de Agricultura Tropical (CIAT).
The data in ARC/INFO Grid, American Standard Code for Information Interchange (ASCII) and Band Interleaved by Line (BIL) formats are available from the NASA Socioeconomic Data and Applications Center (SEDAC).
Purpose: To provide a time series of raster data on population to facilitate data integration.
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Data Set Citation
Dataset Originator/Creator: Center for International Earth Science Information Network (CIESIN)/Columbia University, and Centro Internacional de Agricultura Tropical (CIAT)
Dataset Title: Gridded Population of the World, Version 3 (GPWv3): Population Count Grid
Dataset Release Date: 2005-12
Dataset Release Place: Palisades, NY
Dataset Publisher: NASA Socioeconomic Data and Applications Center (SEDAC)
Data Presentation Form: rasterOnline Resource: http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-count
Vertical Resolution: 23 cm
Temporal Resolution: varies by parameter measured
AGRICULTURE > AGRICULTURAL CHEMICALS > FERTILIZERS
AGRICULTURE > AGRICULTURAL PLANT SCIENCE > CROP/PLANT YIELDS
AGRICULTURE > AGRICULTURAL PLANT SCIENCE > CROPPING SYSTEMS
AGRICULTURE > ANIMAL SCIENCE > ANIMAL MANURE AND WASTE
AGRICULTURE > SOILS > CARBON > BIOMASS CARBON
AGRICULTURE > SOILS > CARBON > CARBON DIOXIDE EVOLUTION
AGRICULTURE > SOILS > CARBON > TOTAL CARBON
AGRICULTURE > SOILS > NITROGEN > AMMONIUM NITROGEN
AGRICULTURE > SOILS > NITROGEN > BIOMASS NITROGEN
AGRICULTURE > SOILS > NITROGEN > NITRATE NITROGEN
AGRICULTURE > SOILS > NITROGEN > TOTAL MINERAL NITROGEN
AGRICULTURE > SOILS > NITROGEN > TOTAL NITROGEN
AGRICULTURE > SOILS > ORGANIC MATTER
AGRICULTURE > SOILS > SOIL BULK DENSITY
BIOSPHERE > VEGETATION > BIOMASS
BIOSPHERE > VEGETATION > NITROGEN
LAND SURFACE > SOILS > CARBON > BIOMASS CARBON
LAND SURFACE > SOILS > CARBON > CARBON DIOXIDE EVOLUTION
LAND SURFACE > SOILS > NITROGEN > AMMONIUM NITROGEN
LAND SURFACE > SOILS > NITROGEN > BIOMASS NITROGEN
LAND SURFACE > SOILS > NITROGEN > NITRATE NITROGEN
LAND SURFACE > SOILS > NITROGEN > TOTAL MINERAL NITROGEN
LAND SURFACE > SOILS > SOIL BULK DENSITY
ATMOSPHERE > ATMOSPHERIC CHEMISTRY > NITROGEN COMPOUNDS > MOLECULAR NITROGEN > NITROGEN DEPOSITION
ISO Topic Category
Quality Width of smallest plot is 4 m
Length of smallest plot is 23 m
Width of largest plot is 6 m
Length of largest plot is 320 m
Slope: 2% on 2/5 of experiment . Shape: Uniform
Details of direction of cultivation: Parallel to long-axis of plots
Width of Bare Strip around plot: 1-1.5m paths.
Width of Discard Strip around ... plot: 6.0m discard strip between
Details of homogeneity of the plots: Variability within plots: most
plots are about 6.0m wide. Transects taken across several plots
indicate that soil movement has occurred and that there is a gradient
across the unplanted path extending about 1m into the plot. Soil and
crop samples are therefore taken from within the central area (4.0m) and
excluding a 1m strip on each side. Within this area, soil analysis
shows that for C, N, pH Olsen P etc. the plots are reasonably uniform,
c.v. about 10% (more for microbial biomass).
There are at least 0 replicates in the experiment. No true replication
but the experiment was divided into 10 sections in 1968 (previously
into 5 sections in 1926). Therefore, plots on sections 1 and 9 can be
regarded as replicates. Sections 2,3,4,5 and 7 could be regarded as
replicates over a five year period (i.e. the length of one rotation).
There are control plots described as follows: Nil inputs plot included
which has received no inorganic fertilizers or organic manures since
1852. Nil plot does get chalk and pesticides on a regular basis. Also
an area fenced off in 1882 and allowed to revert to natural woodland
(see SOMNET entry on Broadbalk Wilderness).
Thorough scrutiny at point of entering onto electronic database (in
1995). Some soil and crop samples from archive have been reanalysed
retrospectively; no unexplained discrepancies observed to date.
Access Constraints none
Use Constraints Link to the following location to view data use policy of SOMNET members:
Role: TECHNICAL CONTACT
Phone: +44 (0)1582 763133
Fax: +44 (0)1582 760981
IACR-Rothamsted AL5 2JQ.
Province or State: Hertfordshire
Country: UNITED KINGDOM
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
Avery, B.W. & Catt. J.A. (1995) The soil at Rothamsted. Lawes
Agricultural Trust, Rothamsted, Harpenden, U.K.
Dyke, G.V., George, B.J., Johnston, A.E., Poulton, P.R. & Todd, A.D.
(1983) The Broadbalk Wheat Experiment 1968-78: Yields and
Plant Nutrients in Crops Grown Continuously and in Rotation. Rothamsted
Experimental Station. Report for 1982, Part 2: 5-44 (and
Garner, H.V. & Dyke, G.V. (1969) The Broadbalk yields. Rothamsted
Experimental Station. Report for 1968, Part 2: 26-49.
Hart, P.B.S., Powlson, D.S., Poulton, P.R., Johnston, A.E. & Jenkinson,
D.S. (1993) The availability of the nitrogen in the crop residues
of winter wheat to subsequent crops. J. Agric. Sci. 121: 355-362.
Jenkinson, D.S. (1990) The turnover of organic carbon and nitrogen in
soil. Phil. Trans. R. Soc. Lond. B. (1990) 53-60..
Johnston, A.E. & Garner, H.V. (1969) Broadbalk: Historical Introduction. Rothamsted Experimental Station. Report for 1968, Part 2:
Johnston, A.E. (1969) Plant nutrients in Broadbalk soils. Rothamsted
Experimental Station. Report for 1968, Part 2: 93-115 (and
Johnston, A.E. (1969) Plant nutrients in crops grown on Broadbalk.
Rothamsted Experimental Station. Report for 1968, Part 2: 50-62.
Creation and Review Dates
DIF Creation Date: 1999-10-20
Last DIF Revision Date: 2006-05-11