Night time Lights Frequency
The image is a map of night time lights frequency data recorded from satellites
orbiting the earth. Dark red is high frequency, red is medium frequency
and grey is low frequency. As with all the maps views in this website
it was created originally in ArcView and the image was clipped out using
XV. The neural net input data was created by importing, projecting
the source data into the common 1 DM geographical projection and outputting
the grid in a standard ascii format using the following ArcInfo commands:
Defense Meteorological Satellite Program (DMSP) Operational Linescan System
(OLS) Night-time lights frequency data.
Night time lights, population and economic activity are closely related.
Light is emitted from various places where it is unlikely to observe large
population densities, such as, sections of motorway, airports, and industrial
sites like oil wells.
Night time light frequency and population patterns across the EU will vary
slightly as a result of differences in the state of economic development,
but the general pattern is obvious from the map.
Originally I thought this product was night time lights intensity data
but it is subtly different, my appologies for the inconsistency in this
reporting. An intensity dataset is currently being created by Chris
Elvidge for the DMSP
(the supplier of this frequency data), hopefully this will be available
in the near future.