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night_lights_2009 (Map Service)


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Current Version: 10.81

Service Description: Version 4 DMSP-OLS Nighttime Lights Time Series The files are cloud-free composites made using all the available archived DMSP-OLS smooth resolution data for calendar years. In cases where two satellites were collecting data - two composites were produced. The products are 30 arc second grids, spanning -180 to 180 degrees longitude and -65 to 75 degrees latitude. A number of constraints are used to select the highest quality data for entry into the composites: * Data are from the center half of the 3000 km wide OLS swaths. Lights in the center half have better geolocation, are smaller, and have more consistent radiometry. * Sunlit data are excluded based on the solar elevation angle. * Glare is excluded based on solar elevation angle. * Moonlit data are excluded based on a calculation of lunar illuminance. * Observations with clouds are excluded based on clouds identified with the OLS thermal band data and NCEP surface temperature grids. * Lighting features from the aurora have been excluded in the northern hemisphere on an orbit-by-orbit manner using visual inspection.

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Layers: Tables: Description: Version 4 DMSP-OLS Nighttime Lights Time Series The files are cloud-free composites made using all the available archived DMSP-OLS smooth resolution data for calendar years. In cases where two satellites were collecting data - two composites were produced. The products are 30 arc second grids, spanning -180 to 180 degrees longitude and -65 to 75 degrees latitude. A number of constraints are used to select the highest quality data for entry into the composites: * Data are from the center half of the 3000 km wide OLS swaths. Lights in the center half have better geolocation, are smaller, and have more consistent radiometry. * Sunlit data are excluded based on the solar elevation angle. * Glare is excluded based on solar elevation angle. * Moonlit data are excluded based on a calculation of lunar illuminance. * Observations with clouds are excluded based on clouds identified with the OLS thermal band data and NCEP surface temperature grids. * Lighting features from the aurora have been excluded in the northern hemisphere on an orbit-by-orbit manner using visual inspection.

Copyright Text: http://www.ngdc.noaa.gov/dmsp/downloadV4composites.html

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly

Tile Info:
Initial Extent:
Full Extent:
Min Scale: 5.91657527591555E8
Max Scale: 1155581.108577

Min LOD: 0
Max LOD: 9

Units: esriMeters

Supported Image Format Types: PNG24

Export Tiles Allowed: false
Max Export Tiles Count: 100000

Document Info: