Archive for the ‘Data Download’ Category

Irrigation-Equipped Area

Friday, December 8th, 2006

IrrigationDownload the data set here.

Source: WWDR
Date: 2000
Resolution: 30′

Floodplains

Friday, December 8th, 2006

FloodplainsDownload the data set here.

Source: WWDR
Date: 2000
Resolution: 30′

Lake volume

Friday, December 8th, 2006

Lake volume Download the data set here.

Source: WWDR
Date: 2000
Resolution: 30′

Lake Density

Friday, December 8th, 2006

Lake DensityDownload the data set here.

Source: WWDR
Date: 2000
Resolution: 30′

Rivers (Hydro1k)

Tuesday, December 5th, 2006

Hydro1kRiver data, not very detailed. Same source as the Drainage Basins/Watersheds data set. It has a couple of potentially interesting columns. Pleace have a look especially for the Flowacc and let me know if this is the info you need… Download the data set here.

3.3.2. Stream Lines

The stream line data layer distributed with the HYDRO1k data set is derived from the flow accumulation and flow direction layers. Cells with upstream drainage areas greater than 1000 km2 are selected from the flow accumulation layer and processed through the STREAMLINK function. The resulting links are attributed with the maximum flow accumulation occurring within that link and the result is vectorized using the STREAMLINE function. These procedures result in a vector data layer of streamlines with each segment of stream attributed with the upstream contributing drainage area. The vector streamlines are attributed with the following fields:

Flowacc = The maximum flow accumulation value of the stream segment. This value corresponds directly with the upstream watershed contributing area. (10-3 km2)

Pf_type = The Pfafstetter level at which the stream segment is considered “main stem”.

Level1 to Level6 = The Pfafstetter units in which the stream segment lie.

Frmelevation = The elevation value of the stream segment’s from-node (m)

Toelevation = The elevation value of the stream segment’s to-node (m)

Strorder = Strahler stream order of the segment

Gradient = Gradient of the stream segment calculated as the difference of the from and to-node elevations divided by the length of the segment

Frmup_flowlen = The upstream flowlength from the from-node. Calculated using ARC/INFO’s FLOWLENGTH function, it is the longest path from the from-node to the drainage basin divide. (m)

Toup_flowlen = The upstream flowlength from the to-node. (m)

Frmdn_flowlen = The downstream flowlength from the from-node. Again from ARC/INFO’s FLOWLENGTH function, it is the length from the from-node to the ocean or a terminal sink. (m)

Todn_flowlen = The downstream flowlength from the to-node. (m)

Source: USGS
Year: 1996
Resolution: 1 km
Notes: Detailed metadata here

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?¨¬?