Archive for the ‘Land’ Category

Potential Evapotranspiration

Friday, November 24th, 2006

Potential EvapotranspirationDownload the ?¢â??Ã?¨?ìPotential Evapotranspiration?¢â??Ã?¨¬ù as a yearly average or as monthly values (as grid).

Source: FAO/CRU
Year: 1961-1990
Resolution: 10?¢â??Ã?¨¬?

Long Term Mean Annual Freshwater Surface Water Fluxes into the World Oceans

Friday, November 24th, 2006

Water Fluxes“Freshwater discharge from continents into the oceans is of major interest in research concerned with global monitoring of freshwater resources, the flux of matter into coastal areas and the open oceans, and the influence of freshwater fluxes on circulation patterns in the ocean and the atmosphere on regional and global scales.

Following two previous publications of estimated Mean Annual Freshwater Surface Water Fluxes into the World Oceans based on 161 and 181 discharge stations, respectively (GRDC, 1996 and GRDC, 1998) the GRDC has reworked this exercise for a third time, now based on 251 discharge stations close to the estuary, featuring basin areas greater than 25.000 sqkm. The report is expected to be published in the course of the year 2005.?�¬�?�¬�?�¬� ?�¬�?�¬�?�¬� ?�¬�(click on image to enlarge it)

Discharge from land areas not integrally captured by GRDC stations has been determined via estimating mean annual runoff coefficients (RC) by means of regionalisation from nearby monitored areas taking into account data from another 1378 GRDC stations and applying precipitation data from the Global Precipitation Climatology Centre (GPCC).

Application of GIS analysis on a 0.5 degree elevation grid optimised for flow path detection allowed to determine the catchments of all the individual grid cells that form the fringe of the continents (around 12.000), i.e. all continental grid cells were co-registered with their respective fringe grid cell through which they drain to the oceans. Furthermore, each grid cell was assigned either a calculated or estimated RC. Thus, it is possible to calculate for each fringe grid cell the integral flux from its adjacent catchment as the spatially weighted product of RC and precipitation over all co-registered grid cells. Summarising the fluxes of subsets of continental fringe cells allows to estimate fluxes for arbitrary coastline sections.
Exemplarily fluxes have thus been determined for the sub-regions defined by the Global International Waters Assessment initiative (GIWA) as well as for a global 10 degree grid. The results are compared to estimates by other authors and methods.”

Source: GRDC

Let me know if you would like to have this data set too…

Digital Elevation Model (Etopo2)

Monday, November 20th, 2006

DEM Etopo2Download the “Etopo2″ here.

Source: NGDC
Year: 2006
Resolution: 2′ (= 3.6 km at the Equator); vertical: 1m

Artifical Areas (Paved, Urban Areas)

Friday, November 17th, 2006

Populated PlacesDownload the “Artifical Areas” as shapefile or grid.
Source: GVM/JRC
Year: 2000
Resolution: 1km x 1km
Notes: Retrieved from the Global Land Cover 2000 dataset. Class “Artifical surfaces”.

Digital Elevation Model (Etopo5)

Thursday, November 16th, 2006

Etopo5Download the Digital Elevation Model (Etopo5) here.

Source: NGDC
Year: 1988
Resolution: 5′

Global Land Cover 2000

Thursday, November 16th, 2006

GLC2000Download the Global Land Cover 2000 here.

Legend: GLC2000 - Legend
Source: GVM/JRC
Year: 2000
Resolution: 1km x 1km

Basic Country (Shape)File

Monday, November 13th, 2006

Basic Country (Shape)FileThis is just the basic country template which we use for underlaying our maps or statistical data. Download the data set ?¢â??Ã?¨?ìCountry Template?¢â??Ã?¨¬ù here. Source: WHO. Date: 2006

Administrative Boundaries

Wednesday, November 1st, 2006

Admi. BoundariesDownload the Administrative Boundaries (shapefile format) here. Source: WHO