[Location: Location_Category='OCEAN', Location_Type='INDIAN OCEAN', Location_Subregion1='BRUNEI']
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Gridded Population of the World, Version 3 (GPWv3): Population Count Grid
Entry ID:
CIESIN_SEDAC_GPWv3_POPCOUNT
Summary
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.
Related URL
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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)
Version:
3.00
Data Presentation Form:
raster
Online Resource:
http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-count
Temporal Coverage
Start Date:
1990-07-01
Stop Date:
1990-07-01
Start Date:
1995-07-01
Stop Date:
1995-07-01
Start Date:
2000-07-01
Stop Date:
2000-07-01
Location Keywords
Data Resolution
Vertical Resolution:
23 cm
Temporal Resolution: varies by parameter measured Science Keywords
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 sections. 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:
http://www.rothamsted.bbsrc.ac.uk/aen/somnet/index.htm Ancillary Keywords
Data Center
Personnel
Role:
TECHNICAL CONTACT
Phone:
+44 (0)1582 763133
Fax:
+44 (0)1582 760981
Contact Address:
IACR-Rothamsted
AL5 2JQ.
City:
Harpenden
Province or State:
Hertfordshire
Country:
UNITED KINGDOM
Role:
DIF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
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 references therein). 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: 1-17. Johnston, A.E. (1969) Plant nutrients in Broadbalk soils. Rothamsted Experimental Station. Report for 1968, Part 2: 93-115 (and references therein). 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
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