Details

Autor(en) / Beteiligte

• Teillet, P.M.
• Fedosejevs, G.

Titel

On the Dark Target Approach to Atmospheric Correction of Remotely Sensed Data

Ist Teil von

• Canadian journal of remote sensing, 1995-12, Vol.21 (4), p.374-387

Erscheinungsjahr

1995

Link zum Volltext

Beschreibungen/Notizen

• This paper gives an overview of the dark target approach, an image-based methodology for aerosol optical depth estimation used in the context of atmospheric correction. The method involves relatively comprehensive atmospheric computations, unlike the often-used dark object subtraction technique that is more approximate in nature, while nevertheless requiring no additional information on atmospheric conditions. Specifications for a dark target algorithm applicable to Landsat Thematic Mapper (TM) image data are provided. The algorithm data flow is described in terms of three main steps: dark target digital count extraction, conversion to reflectance values, and aerosol optical depth determination. The key uncertainties in the approach are the assumed values of the dark target surface reflectances in the relevant spectral bands and the radiometric sensor calibration. Test results based on the application of the dark target algorithm to a series of Canadian TM scenes are presented.