This data set consists of Upward Looking Sonar (ULS) data from 11 moorings in the Greenland Sea. Parameters in the processed data files include ice draft, water pressure, and water temperature. Raw data files with sonar travel time, and files with draft frequency of occurrence, are available as well. A single statistical file for each mooring summarizes that mooring's record. These data were contributed by the Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany, in 2002 and 2004, as a contribution to the World Climate Research Programme's Arctic Climate System Study/Climate and Cryosphere (ACSYS/CliC) Project. Data are available via FTP.

NSIDC strongly encourages you to register as a user of this data product. As a registered user, you will be notified of updates and corrections. When registering, please include the title of this data set, AWI Moored ULS Data, Greenland Sea and Fram Strait, 1991-2002.

The ASTER Global Water Bodies Database (ASTWBD) Version 1 data product provides global coverage of water bodies larger than 0.2 square kilometers at a spatial resolution of 1 arc second (approximately 30 meters) at the equator, along with associated elevation information.

The ASTWBD data product was created in conjunction with the ASTER Global Digital Elevation Model (ASTER GDEM) Version 3 data product by the Sensor Information Laboratory Corporation (SILC) in Tokyo. The ASTER GDEM Version 3 data product was generated using ASTER Level 1A (https://doi.org/10.5067/ASTER/AST_L1A.003) scenes acquired between March 1, 2000, and November 30, 2013. The ASTWBD data product was then generated to correct elevation values of water body surfaces.

To generate the ASTWBD data product, water bodies were separated from land areas and then classified into three categories: ocean, river, or lake. Oceans and lakes have a flattened, constant elevation value. The effects of sea ice were manually removed from areas classified as oceans to better delineate ocean shorelines in high latitude areas. For lake waterbodies, the elevation for each lake was calculated from the perimeter elevation data using the mosaic image that covers the entire area of the lake. Rivers presented a unique challenge given that their elevations gradually step down from upstream to downstream; therefore, visual inspection and other manual detection methods were required.

The geographic coverage of the ASTWBD extends from 83°N to 83°S. Each tile is distributed in GeoTIFF format and referenced to the 1984 World Geodetic System (WGS84)/1996 Earth Gravitational Model (EGM96) geoid. Each data product is provided as a zipped file that contains an attribute file with the water body classification information and a DEM file, which provides elevation information in meters.

PALSAR_Radiometric_Terrain_Corrected_low_res

PALSAR_Radiometric_Terrain_Corrected_high_res

ALOS PALSAR Level 1.5

ALOS PALSAR Level 1.0

The aerial photography inventoried by the Pilot Land Data System
(PLDS) at NASA AMES Research Center has been transferred to the USGS
EROS Data Center. The photos were obtained from cameras mounted on
high and medium altitude aircraft based at the NASA Ames Research
Center. Several cameras with varying focal lengths, lenses and film
formats are used, but the Wild RC-10 camera with a focal length of 152
millimeters and a 9 by 9 inch film format is most common. The positive
transparencies are typically used for ancillary ground checks in
conjunctions with digital processing for the same sites. The aircraft
flights, specifically requested by scientists performing approved
research, often simultaneously collect data using other sensors on
board (e.g. Thematic Mapper Simulators (TMS) and Thermal Infrared
Multispectral Scanners). High altitude color infrared photography is
used regularly by government agencies for such applications as crop
yield forecasting, timber inventory and defoliation assessment, water
resource management, land use surveys, water pollution monitoring, and
natural disaster assessment.

To order, specify the latitude and longitude of interest. You will then be
given a list of photos available for that location. In some cases, "flight
books" are available at EDC that describe the nature of the mission during
which the photos were taken and other attribute information. The customer
service personnel have access to these books for those photo sets for which
the books exist.

Digital line graph (DLG) data are digital representations of cartographic information. DLG's of map features are converted to digital form from maps and related sources. Intermediate-scale DLG data are derived from USGS 1:100,000-scale 30- by 60-minute quadrangle maps. If these maps are not available, Bureau of Land Management planimetric maps at a scale of 1: 100,000 are used. Intermediate-scale DLG's are sold in five categories: (1) Public Land Survey System; (2) boundaries (3) transportation; (4) hydrography; and (5) hypsography. All DLG data distributed by the USGS are DLG - Level 3 (DLG-3), which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks.