Data Type: Fish ; Data depicts upper and lower extent of Anadromous fish streams throughout Alaska and is updated regularly. ARC/INFO software is used to manage and update data. This dataset is used to produce the Anadromous Waters Catalog for Alaska. Many other Alaska Resource Management agencies are known to use this dataset within their own agencies, utilizing that subset that pertains to the lands under their jurisdiction. The U.S. Forest Service is known to utilize this dataset and the EXXON Valdez Oil Spill Trustee Council has as well. Additionally, stream arcs are available for the EVOS area.

Data Type: Freshwater Systems; Statewide rivers and streams were assembled from eighteen files in the USGS 1:2,000,000 Digital Line Graphs (DLG) dataset. There are nearly 30,000 arcs in this coverage with at least 34 different arc attributes.

Data Type: Freshwater Systems; Statewide lakes greater than 20 acres was assembled from seventeen separate files in the USGS 1:2,000,000 Digital Line Graphs (DLG). This dataset is intended for widely varied application.

Data Type: Multi-Resources; Series of automated maps recording ANCSA & S12(a) and S12(b) conveyances, anadramous streams, timber stands, habitat, subsistence areas (including marine mammal haul-out areas); Aleut place names, S17(b) easements, oil spill impacted beaches, mineralogy, land planning and use areas all specific to Chenega Corporation lands.

NOAA Coast Watch is designed to provide federal and state decision makers and researchers with rapid access to satellite data imagery of U.S. coastal and offshore regions. The primary product is sea surface temperature from the Advanced Very High Resolution Radiometer (AVHRR) instrument onboard NOAA's Polar Orbiting Environmental Satellites. In addition, AVHRR Channel 1, Channel 2, and solar zenith angles are available for selected subregions for calculating turbidity. Images are available for the U.S. northeast coast, southeast coast, Great Lakes, Gulf of Mexico, Aleutian Islands and Hawaiian Islands at 1.1 km and 4 km resolutions. U.S west coast images are available at 4 km resolution. Images of Puerto Rico and Jamaica are available at 1.1 km resolution. Over 280,000 images have been archived at the National Oceanographic Data Center since 1990. These data are currently available online to researchers, educators and decision makers via NODC's NOAA Coast Watch Archive and Access System (NCAAS). To download data, users must register with NODC. A telnet session allows the selection of data, which may then be retrieved by FTP. See the NCAAS page at: http://www.nodc.noaa.gov/NCAAS/ncaas-home.html [This summary was derived from NODC Environmental Information Bulletin No. 92-4 and the NODC WWW pages.]

Four years (1 January 1973 through 31 December 1976) of Arctic and Antarctic sea ice conditions, derived from Nimbus-5 Electrically Scanning Microwave Radiometer (ESMR) brightness temperatures (TB), are mapped on polar stereographic grids enclosing the 50 degree north and 50 degree south latitude circles. Grid size varies from about 32 by 32 km at the poles to about 28 by 28 km at 50 degrees. Sea ice concentrations were calculated from TBs for each grid point with an algorithm that uses an emissivity value of 0.92 and an ice physical temperature estimate from climatological surface air temperatures. Monthly, multiyear monthly and yearly grids of TB's and sea ice concentrations were created for 1973-1976, except for seven months for which usable data were insufficient. Three-day averaged TB grids are also available for both hemispheres (two tapes per hemisphere.) Data produced by H.J. Zwally, C.L. Parkinson, J.C. Comiso, all of NASA/Goddard Space Flight Center. Published atlases for Arctic and Antarctic are available (NASA SP-489, 1987 and NASA-SP-459, 1983, respectively.) Data available via ftp, or can be packaged on 4mm or 8mm tape; data reports provided with data orders.

As Alaska's cities get bigger, streams that once supported healthy runs of salmon now find themselves polluted, re-routed or otherwise altered. Chester Creek is one such stream. It flows through the center of Anchorage, Alaska's largest city. As Doug Schneider reports in this week's Arctic Science Journeys Radio, a scientist who studied the creek offers suggestions to save the creek's city salmon.

Major hydrological basins and their sub-basins. This dataset divides the African continent according to its hydrological characteristics. The dataset consists of the following information:- numerical code and name of the major basin (MAJ_BAS and MAJ_NAME); - area of the major basin in square km (MAJ_AREA); - numerical code and name of the sub-basin (SUB_BAS and SUB_NAME); - area of the sub-basin in square km (SUB_AREA); - numerical code of the sub-basin towards which the sub-basin flows (TO_SUBBAS) (the codes -888 and -999 have been assigned respectively to internal sub-basins and to sub-basins draining into the sea)

Data Type: Freshwater Systems; Selected major rivers were extracted from all rivers and streams in the USGS 1:2,000,000 Digital Line Graphs (DLG) dataset. The major rivers include the Copper, Susitna, Kuskokwim, Yukon, Koyukuk, Kobuk, Noatak, and Colville Rivers. There are over 5300 arcs in this coverage with at least 25 arc attributes.

Data Type: Exxon Valdez Oil Spill; This database was developed to incorporate August 1990 survey data files from Exxon. Data is referenced to beach segment and subdivision and includes oiling, beach substrate type and presence of anadromous streams. This database could be linked to ADEC's GIS system.