Geo-atmospheric processing of airborne imaging spectrometry data Part 2: atmospheric / topographic correction
نویسنده
چکیده
A method for the radiometric correction of wide field-of-view airborne imagery has been developed that accounts for the angular dependence of the path radiance and atmospheric transmittance functions to remove atmospheric and topographic effects. The first part of processing is the parametric geocoding of the scene to obtain a geocoded, orthorectified image and the view geometry (scan and azimuth angles) for each pixel as described in part 1 of this jointly submitted paper. The second part of the processing performs the combined atmospheric/topographic correction. It uses a database of look-up tables of the atmospheric correction functions (path radiance, atmospheric transmittance, direct and diffuse solar flux) calculated with a radiative transfer code. Additionally, the terrain shape obtained from a digital elevation model is taken into account. The issues of the database size and accuracy requirements are critically discussed. The method supports all common types of imaging airborne optical instruments: panchromatic, multispectral, and hyperspectral, including fore/aft tilt sensors covering the wavelength range 0.35 – 2.55 μm and 8-14 μm. The processor is designed and optimized for imaging spectrometer data. Examples of processing of hyperspectral imagery in flat and rugged terrain are presented. A comparison of ground reflectance measurements with surface reflectance spectra derived from airborne imagery demonstrates that an accuracy of 1 – 3 % reflectance units can be achieved.
منابع مشابه
Effects of Geo-atmospheric Preprocessing on Imaging Spectroscopy Data Quality and Methods
Advanced methods of geo-atmospheric preprocessing have become available in the past years and increasingly are applied to AVIRIS airborne imagery. Both, the geometric as well as the atmospheric part of the preprocessing have their specific impact on data quality which should be aware to scientists using such corrected data. An integral geoatmospheric correction has been developed in a joint eff...
متن کاملGeo-atmospheric processing of airborne imaging spectrometry data Part 1: parametric orthorectification
An operational orthorectification solution in support of the combined geometric and radiometric processing of currently available imaging spectrometry data is presented. The described parametric geocoding procedure (PARGE) strictly considers the aircraft and terrain geometry parameters and uses a forward transformation algorithm to create orthorectified imaging spectrometry cubes. The implement...
متن کاملOn the Atmospheric Correction of Antarctic Airborne Hyperspectral Data
The first airborne hyperspectral campaign in the Antarctic Peninsula region was carried out by the British Antarctic Survey and partners in February 2011. This paper presents an insight into the applicability of currently available radiative transfer modelling and atmospheric correction techniques for processing airborne hyperspectral data in this unique coastal Antarctic environment. Results f...
متن کاملLevel Ii Pre-processing Concept for the Airborne Prism Experiment (apex)
A concept for the processing and archiving facility for APEX (Airborne Prism Experiment) is defined. A special emphasize is put on the level 2 processing steps which include geometric, radiometric and atmospheric correction of the image data. The presented concept combines these processing steps in a radiometrically logical manner and allows the online production of user required products. The ...
متن کاملA Unified Approach to Parametric Geocoding and Atmospheric/topographic Correction for Wide Fov Airborne Imagery Part 1 : Parametric Ortho-rectification Process
A combined geometric and radiometric processing chain for hyperspectral data is presented. This paper describes the ortho-rectification solution for the geometric part of the whole problem. A parametric geocoding approach (PARGE) has been chosen. The geometrical model strictly considers all navigational parameters engaging a forward transformation methodology. For the implementation, a number o...
متن کامل