Archive for the ‘Water’ Category

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′

RiverGIS

Thursday, December 7th, 2006

RiverGISDon’t know if this is of use for anybody…

Global Change Master Directory Search

Thursday, December 7th, 2006

Data SearchThis site is a pretty good search engine for all kinds of data sets (Runoff, Precipitation, Agriculture, etc.). So in case you look for something, try this search too.

Global River Discharge (RivDIS)

Thursday, December 7th, 2006

Website LinkThe Global River Discharge (RivDIS) data set contains monthly discharge measurements for 1018 stations located throughout the world. The period of record varies widely from station to station, with a mean of 21.5 years. The data were digitized from published UNESCO river archives

Atlas of the Biosphere

Wednesday, December 6th, 2006

Atlas of the BiosphereThere are some interesting data sets on this site, not too actual in most cases, but nevertheless eventually useful, as for example: another data set on “Built-up land”, “Irrigated Lands”,?Ã?¬â?  some more soil data, “Suitability for Agriculture” and others.

Please let me know which data we should include.

Word Lakes Database

Wednesday, December 6th, 2006

World Lakes DatabaseDetailed information about hundreds of lakes… table site

Global River Discharge Database

Wednesday, December 6th, 2006

Global River Discharge DatabaseThis site contains a compilation of monthly mean river discharge data for over 3500 sites worldwide. The data sources are RivDis2.0, the United States Geological Survey, Brazilian National Department of Water and Electrical Energy, and HYDAT-Environment Canada. The period of record for each station is variable, from 3 years to greater than 100. All data is in m3/s. Here is an example of a data table for a Rhone station. Table?�¬�

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