Skip to Codiac content Skip to data content Skip to data search

A Half-Century of Change in Arctic Alaskan Shrubs: A Photographic-Based Assessment

Summary

In this study, the locations of 193 old aerial photographs of northern Alaskan landscapes were rephotographed and assessed for changes in vegetation. The original photographs were taken over northern Alaska between 1948 and 1951, and the new photographs were taken between 1999 and 2003. The region covered by the original and repeat photographs stretches from the southern extent of the Brooks Range in the south to the Coastal Plain in the north, and from the Chukchi Sea in the west to the Canning River in the east.

The original photographs were taken by the U.S. military as part of geologic reconnaissance and exploration, and the method used to acquire them was to fly both sides of a river valley while photographing the river and the facing valley slopes. Of the several thousand original photographs, only a fraction were repeated for the purpose of assessing vegetation change. Repeat photographs were selected for geographic coverage and to produce the greatest likelihood of detecting vegetation change. The original and repeat photographs were then scanned and stored in TIFF format. Individual image file sizes range from 5 to 60 MB each, and the total file size for the data set is approximately 11 GB.

The images should not be published without the consent of the investigators.

Data access

ORDER data for delivery by FTP

Additional information

Related projects: ARCSS
Observational frequency: other
Spatial type: point
Categories: Arctic, Photography
Documentation:

Temporal coverage

Begin datetime: 1948-01-01 01:01:00, End datetime: 2003-12-31 23:59:59

Spatial coverage

Minimum latitude: 68.000000, Minimum longitude: -165.000000
Maximum latitude: 70.000000, Maximum longitude: -145.000000

map

Point of contact

Matthew Sturm
US Army
E-Mail address: msturm at crrel dot esace dot army dot mil