Description:

This dataset includes maps of historical lake shorelines with derived lake areas in the southern portion of the Goldstream Valley and the surrounding landscape north of Fairbanks, Alaska, USA. Historical lake margins were mapped for 1949, 1967, and 1985 using 1 m aerial photographs available through U.S. Geological Survey Earth Explorer, and for 2009 using 2.5 m SPOT satellite image mosaics. The study area was a 214 km² area of Pleistocene-aged yedoma permafrost in the southern portion of the Goldstream Valley. An increasing number of thermokarst lakes and ponds, from 130–275 per year, were identified over the entire study period. Anthropogenic lakes, formed by mining peat, gravel, and gold concentrated in the northwestern extent of Goldstream Valley, were excluded.

Links:

• Data link
• Metadata link
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• Metadata link
• Browse image link
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Temporal Extent:

Start: 1949-01-01T00:00:00.000Z

End: 2009-12-31T23:59:59.000Z

Spatial Extent:

Minimum Bounding Rectangle: 64.83 -147.98 64.96 -147.66

ORNL_CLOUD Short Name: Historical_Lake_Shorelines_AK_1859 Version ID: 1 Unique ID: C2067629235-ORNL_CLOUD

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Description:

Land cover has been interpreted from Satellite images and field checked, other information has been digitized from topographic maps Members informations: Attached Vector(s): MemberID: 1 Vector Name: Land use Source Map Name: SPOT Pan Source Map Scale: 50000 Source Map Date: 1989/90 Projection: Polyconic on Modified Everest Ellipsoid Feature_type: polygon Vector Land use maps, interpreted from SPOT panchromatic imagery and field checked (18 classes) Members informations: Attached Vector(s): MemberID: 2 Vector Name: Administrative boundaries Source Map Name: topo sheets Source Map Scale: 50000 Source Map Date: ? Feature_type: polygon Vector Dzongkhags (Districts) and Gewogs Members informations: Attached Vector(s): MemberID: 3 Vector Name: Roads Source Map Name: topo sheets Source Map Scale: 50000 Source Map Date: ? Feature_type: lines Vector Road network Attached Report(s) Member ID: 4 Report Name: Atlas of Bhutan Report Authors: Land use planning section Report Publisher: Ministry of Agriculture, Thimpu Report Date: 1997-06-01 Report Land cover (1:250000) and area statistics of 20 Dzongkhags

Links:

• ICId0014_202

Temporal Extent:

Start: 1970-01-01T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 26.54 88.8 28.46 92.37

SCIOPS Short Name: ICId0014_202 Version ID: Not provided Unique ID: C1214155400-SCIOPS

Description:

Satellite image map of Bunger Hills West/Wilkes Land, Antarctica. This map was produced for the Australian Antarctic Division by AUSLIG Commercial (now Geoscience Australia), in Australia, in 1992. The map is at a scale of 1:50000, and was produced from four multispectral space imagery SPOT 1 scenes. It is projected on a Transverse Mercator projection, and shows glaciers/ice shelves, stations/bases and gives some historical text information. The map has both geographical and UTM co-ordinates.

Links:

• Data link
• Metadata link
• Metadata link
• bunger_west_sat

Temporal Extent:

Start: 1992-06-01T00:00:00.000Z

End: 1992-06-30T23:59:59.999Z

Spatial Extent:

Minimum Bounding Rectangle: -66 100 -66 101

AU_AADC Short Name: bunger_west_sat Version ID: 1 Unique ID: C1214313353-AU_AADC

Description:

On the background of these requirements for sensor calibration, intercalibration and product validation, the subgroup on Calibration and Validation of the Committee on Earth Observing System (CEOS) formulated the following recommendation during the plenary session held in China at the end of 2004, with the goal of setting-up and operating an internet based system to provide sensor data, protocols and guidelines for these purposes: Background: Reference Datasets are required to support the understanding of climate change and quality assure operational services by Earth Observing satellites. The data from different sensors and the resulting synergistic data products require a high level of accuracy that can only be obtained through continuous traceable calibration and validation activities. Requirement: Initiate an activity to document a reference methodology to predict Top of Atmosphere (TOA) radiance for which currently flying and planned wide swath sensors can be intercompared, i.e. define a standard for traceability. Also create and maintain a fully accessible web page containing, on an instrument basis, links to all instrument characteristics needed for intercomparisons as specified above, ideally in a common format. In addition, create and maintain a database (e.g. SADE) of instrument data for specific vicarious calibration sites, including site characteristics, in a common format. Each agency is responsible for providing data for their instruments in this common format. Recommendation : The required activities described above should be supported for an implementation period of two years and a maintenance period over two subsequent years. The CEOS should encourage a member agency to accept the lead role in supporting this activity. CEOS should request all member agencies to support this activity by providing appropriate information and data in a timely manner. Pseudo-Invariant Calibration Sites (PICS): Algeria 3 is one of six CEOS reference Pseudo-Invariant Calibration Sites (PICS) that are CEOS Reference Test Sites. Besides the nominally good site characteristics (temporal stability, uniformity, homogeneity, etc.), these six PICS were selected by also taking into account their heritage and the large number of datasets from multiple instruments that already existed in the EO archives and the long history of characterization performed over these sites. The PICS have high reflectance and are usually made up of sand dunes with climatologically low aerosol loading and practically no vegetation. Consequently, these PICS can be used to evaluate the long-term stability of instrument and facilitate inter-comparison of multiple instruments.

Links:

• undefined
• undefined

Temporal Extent:

Start: 1972-08-11T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 29.09 5.22 31.36 10.01

USGS_LTA Short Name: CEOS_CalVal_Test_Sites-Algeria3 Version ID: Not provided Unique ID: C1220567099-USGS_LTA

Description:

On the background of these requirements for sensor calibration, intercalibration and product validation, the subgroup on Calibration and Validation of the Committee on Earth Observing System (CEOS) formulated the following recommendation during the plenary session held in China at the end of 2004, with the goal of setting-up and operating an internet based system to provide sensor data, protocols and guidelines for these purposes: Background: Reference Datasets are required to support the understanding of climate change and quality assure operational services by Earth Observing satellites. The data from different sensors and the resulting synergistic data products require a high level of accuracy that can only be obtained through continuous traceable calibration and validation activities. Requirement: Initiate an activity to document a reference methodology to predict Top of Atmosphere (TOA) radiance for which currently flying and planned wide swath sensors can be intercompared, i.e. define a standard for traceability. Also create and maintain a fully accessible web page containing, on an instrument basis, links to all instrument characteristics needed for intercomparisons as specified above, ideally in a common format. In addition, create and maintain a database (e.g. SADE) of instrument data for specific vicarious calibration sites, including site characteristics, in a common format. Each agency is responsible for providing data for their instruments in this common format. Recommendation : The required activities described above should be supported for an implementation period of two years and a maintenance period over two subsequent years. The CEOS should encourage a member agency to accept the lead role in supporting this activity. CEOS should request all member agencies to support this activity by providing appropriate information and data in a timely manner. Instrumented Sites: Dome C, Antarctica is one of eight instrumented sites that are CEOS Reference Test Sites. The CEOS instrumented sites are provisionally being called LANDNET. These instrumented sites are primarily used for field campaigns to obtain radiometric gain, and these sites can serve as a focus for international efforts, facilitating traceability and inter-comparison to evaluate biases of in-flight and future instruments in a harmonized manner.  In the longer-term it is anticipated that these sites will all be fully automated and provide surface and atmospheric measurements to the WWW in an autonomous manner reducing some of the cost of a manned campaign, at present three can operate in this manner.

Links:

• undefined
• undefined

Temporal Extent:

Start: 1972-12-06T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: -76.6 123 -74.5 131.18

USGS_LTA Short Name: CEOS_CalVal_Test_Site-Dome_C-Antarctica Version ID: Not provided Unique ID: C1220566821-USGS_LTA