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The California Coastal Records Project, founded in 2002, [1] documents the California coastline with aerial photos taken from a helicopter flying parallel to the shore. Their webpage provides access to these images. One photo was taken every 500 feet. [2] [3] Each photo showed a few hundred yards of the coastline, with frames overlapping. [4]
Historical geographic information systems are built from a variety of sources and techniques. An especially prominent method is the digitization and georeferencing of historical maps. Old maps may contain valuable information about the past. By adding coordinates to such maps, they may be added as a feature layer to modern GIS data.
Microsoft Research Maps (MSR Maps) was a free online repository of public domain aerial imagery and topographic maps provided by the United States Geological Survey (USGS). The site was a collaboration between Microsoft Research (MSR), Bing Maps, and the USGS. It was in operation from June 1998 to March 2016.
The National Collection of Aerial Photography is a photographic archive in Edinburgh, Scotland, containing over 30 million aerial photographs of worldwide historic events and places. From 2008–2015 it was part of the Royal Commission on the Ancient and Historical Monuments of Scotland [ 1 ] and since then it has been a sub-brand of Historic ...
As proper interpretation of aerial photos can reveal historical changes of the topography and the details of previous landslides, it can be help determine whether an area is stable or not. [ 5 ] [ 4 ] Geologists can further utilize the interpretations to design the most favorable locations for field studies and the acquisition of data.
OpenStreetMap (abbreviated OSM) is a free, open map database updated and maintained by a community of volunteers via open collaboration. [4] Contributors collect data from surveys, trace from aerial photo imagery or satellite imagery, and import from other freely licensed geodata sources.
The TerraServer viewer allows users to select imagery from different dates and of different resolutions. While most of the TerraServer imagery is focused on high resolution, color, satellite and aerial imagery, TerraServer.com also offers Color Infrared Imagery, Panchromatic Imagery, Low Resolution Satellite Imagery, and topographic maps.
Overlapping of aerial photos means that around 60% of the covered area of every aerial image overlays that of the one before it. [2] Every object along the flying path can be observed twice at a minimum. [2] The purpose of overlapping the aerial photography is to generate the 3D topography or relief when using a stereoscope for interpretation. [2]