Accession Number : AD0764239

Title :   On the Thermal Nature and Sensing of Snow-Covered Arctic Terrain.

Descriptive Note : Research note,

Corporate Author : ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA

Personal Author(s) : Poulin,Ambrose O.

Report Date : MAY 1973

Pagination or Media Count : 188

Abstract : Thermal infrared imagery (8 to 14 micrometers) of selected areas of the North American Arctic above the 75th parallel was obtained at three different periods: early winter, midwinter and early spring. Data runs totaling approximately 2500 nautical miles in length were made at altitudes ranging from 1000 to 20,000 feet. Environmental conditions included: (1) daytime with solar altitudes from 2 to 27 degrees and the atmosphere ranging from very clear to very hazy, and (2) very clear to very hazy conditions during the dark season. Subjects covered included sea ice, coastal areas, inland areas, lakes, streams, glaciers, the Greenland Ice Cap, and the Ward-Hunt Ice Shelf. Questions arising from analysis of the imagery led to a winter experiment in which study was concentrated on the temperature differences that develop at shorelines, but a number of secondary studies were also conducted. Aerial radiometric data and photographs were correlated with ground data which included subsurface temperatures in the soil, ice, and snow on both sides of a shoreline. A classification system for thermal features exhibited by arctic terrain and preliminary criteria for seasonal maps was developed. (Modified author abstract)

Descriptors :   (*ARCTIC REGIONS, AERIAL PHOTOGRAPHY), INFRARED DETECTORS, INFRARED PHOTOGRAPHY, TERRAIN, SNOW, SEA ICE, SURFACE TEMPERATURE, THERMAL RADIATION, MAPPING

Subject Categories : Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE