Archive for November, 2006

Rivers & Lakes Connectivity

Monday, November 27th, 2006

Rivers & LakesDon’t know if this can cause a problem for your models: The (not existent) connectivity between rivers and lakes. The rivers are lines, the lakes polygons. Thus, they are considered and treated as two separate layers. So, the computer will probably think that the upstream river ends somewhere (at the beginning of a lake, but that, it does not recognize). And that somewhere else another (but in fact the same) river starts…

Coastline

Monday, November 27th, 2006

ShorelineThe existing country template is a somewhat generalized version. Here is a higher-resolution coastline (with countries break-up for the moment). The snapshot above shows the difference between the two (the red one being the new data set). It’s a couple-of-kilometers-stretch at the western spanish coast.

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…

Animals – Buffalos Density

Friday, November 24th, 2006

BuffalosDownload the ?¢â??Ã?¨?ìBufallo Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

Animals – Bovine Density

Friday, November 24th, 2006

Bovines Download the ?¢â??Ã?¨?ìBovine Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

Animals – Goats Density

Friday, November 24th, 2006

Goats Download the ?¢â??Ã?¨?ìGoats Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

Animals – Poultry Density

Friday, November 24th, 2006

Poultry Download the ?¢â??Ã?¨?ìPoultry Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

Animals – Pigs Density

Friday, November 24th, 2006

Pigs Download the ?¢â??Ã?¨?ìPig Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

Animals – Ruminant Density

Friday, November 24th, 2006

Ruminant Download the ?¢â??Ã?¨?ìAnimals – Ruminant Density?¢â??Ã?¨¬ù here (as grid).

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?