title: Reduction of radiometric miscalibration--applications to pushbroom sensors.
abstract: The analysis of hyperspectral images is an important task in Remote Sensing. Foregoing radiometric calibration results in the assignment of incident electromagnetic radiation to digital numbers and reduces the striping caused by slightly different responses of the pixel detectors. However, due to uncertainties in the calibration some striping remains. This publication presents a new reduction framework that efficiently reduces linear and nonlinear miscalibrations by an image-driven, radiometric recalibration and rescaling. The proposed framework-Reduction Of Miscalibration Effects (ROME)-considering spectral and spatial probability distributions, is constrained by specific minimisation and maximisation principles and incorporates image processing techniques such as Minkowski metrics and convolution. To objectively evaluate the performance of the new approach, the technique was applied to a variety of commonly used image examples and to one simulated and miscalibrated EnMAP (Environmental Mapping and Analysis Program) scene. Other examples consist of miscalibrated AISA/Eagle VNIR (Visible and Near Infrared) and Hawk SWIR (Short Wave Infrared) scenes of rural areas of the region Fichtwald in Germany and Hyperion scenes of the Jalal-Abad district in Southern Kyrgyzstan. Recovery rates of approximately 97% for linear and approximately 94% for nonlinear miscalibrated data were achieved, clearly demonstrating the benefits of the new approach and its potential for broad applicability to miscalibrated pushbroom sensor data.
authors.affiliation: Helmholtz Centre Potsdam-GFZ German Research Centre for Geosciences, Potsdam, Germany. christian.rogass@gfz-potsdam.de
authors.forename: Christian
authors.initials: C
authors.lastname: Rogass
authors.forename: Daniel
authors.initials: D
authors.lastname: Spengler
authors.forename: Mathias
authors.initials: M
authors.lastname: Bochow
authors.forename: Karl
authors.initials: K
authors.lastname: Segl
authors.forename: Angela
authors.initials: A
authors.lastname: Lausch
authors.forename: Daniel
authors.initials: D
authors.lastname: Doktor
authors.forename: Sigrid
authors.initials: S
authors.lastname: Roessner
authors.forename: Robert
authors.initials: R
authors.lastname: Behling
authors.forename: Hans-Ulrich
authors.initials: HU
authors.lastname: Wetzel
authors.forename: Hermann
authors.initials: H
authors.lastname: Kaufmann
mesh_terms: D000465:Algorithms; D001331:Automation; D002138:Calibration; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted; D015233:Models, Statistical; D008962:Models, Theoretical; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods