Available Data Products compatible with IWMI Synthesizer

A major benefit of the IWMI World Water and Climate Atlas is the growing library of data products either directly compatible, or easily converted, for use in the Synthesizer. Data products are accessible using the Synthesizer and available over the web at the IWMI site unless otherwise noted. We are in the process of developing additional data products for distribution on CD-ROM. Specific questions about individual data sets should be addressed directly to the originators of the products rather than to IWMI.

Climate Grids

IWMI has located and made ready to use in Synthesizer the following externally produced grids. IWMI recognizes the propriety and vested interest of the producers of these data products and is in the process of obtaining permission to reformat and distribute these data.

1) Africa, monthly and annual summary climate grids for all of Africa. These grids consist of mean temperature and total precipitation. These grids contain sufficient climate information to estimate ETo. They are gridded at a 3-arc minute resolution. The Australian National University produced these.

2) World, monthly and annual summary climate grids. These grids consist of mean temperature and total precipitation. These grids contain sufficient climate information to estimate ETo. They are gridded at a 30-arc minute resolution. The current release has a very coarse data range (0-20mm, 21-50mm, etc.). FAO published these.

3) USA, monthly and annual summary climate grids. These grids consist of maximum, minimum and mean temperature, total precipitation, snowfall, etc. These grids contain sufficient climate information to estimate ETo. They are gridded at a 2.5-arc minute resolution. Oregon State University (PRISM) produced these.

4) Global monthly time-series climate grids. These grids consist of time-series monthly mean temperature and precipitation. They are gridded at a 3×5-arc degree resolution (very coarse). The USA National Climatic Data Center (NCDC) produced these.

5) Global monthly time-series climate grids. These grids consist of time-series temperature, precipitation and secondary variables from 1901-1996. These grids contain sufficient climate information to estimate ETo. They are gridded at a 30-arc minute resolution. The Climate Research Unit at the University of East Anglia produced these. A conversion program is available for download from the IWMI Synthesizer Data Products site for these products. Converted grids will be available for delivery on CD in January 1999.

Non-Climate Grids

1) Global Land Cover Characterization. Global / continental, summary and seasonal. These grids consist of indices for ecosystem, biosphere-atmosphere, vegetation, crops locations (irrigated and non-irrigated), seasonal vegetation and elevations. These are gridded at a 1-km resolution. A cooperative group including USGS and NASA produced these grids. (Due to the large size these are not available via the IWMI web site.

2) GTOPO30 Global elevation. This is gridded at a 30-arc second resolution. The USGS produced these grids. (Due to the large size this is not available via the IWMI web site).

3) HYDRO1K elevation / other. Hydrologically corrected elevation of North America, Africa, South America (coming soon), and other areas when provided by USGS. These include elevation, streamlines, slope, aspect, and watershed delineation. (Due to the large size these are not available via the IWMI web site).

4) Global, major river basins. This is gridded at a 30-arc minute resolution. The USGS produced this grid.

5) Global, population density. This is gridded at a 5-arc minute resolution. The Consortium for International Earth Science Information Network (CIESIN) produced this grid.

Time-Series Point Data

1) Global Daily Summary (daily 1977 – 1991). World, daily climate stations with maximum and minimum temperature and total precipitation. The USA National Climatic Data Center (NCDC) produced this product. (Due to the large size this is not available via the IWMI web site.)

2) Global Summary of the Day (daily 1994 – present). World, daily climate stations with maximum and minimum temperature and total precipitation. The USA National Climatic Data Center (NCDC) produces this product. (Due to the large size this is not available via the IWMI web site.)

3) FAO ClimWat – Summary FAO global data.

4) FAO – Monthly time-series organized by FAO. (At present, a link to source site for purchase on CD-ROM.)

5) Global Historical Climate Network (version 1 & 2, monthly 1870’s to 1990’s). World, monthly summary data from daily climate stations with maximum and minimum temperature and total precipitation. The USA National Climatic Data Center (NCDC) produces this product. (Due to the large size this is not available via the IWMI web site.)

6) USA COOP Daily Data (daily 1800’s – present). USA, daily climate station data with numerous data elements such as maximum and minimum temperature, total precipitation, snowfall, snow depth, etc. USA National Climatic Data Center is the master archive of the data, while volunteer observers nationwide collect it. (Due to the large size this is not available via the IWMI web site.)

7) Other – Numerous monthly and daily data sets of temperature and precipitation data from around the world. Examples: Former Soviet Union (~250 stations with 50 years of daily data); China (200 stations, monthly); Indonesia / Malaysia (50 years of daily data); South America (monthly); Snotel data (USA, daily mountain regions 1985 — present); etc. (These are yet to be converted to the Synthesizer format.)