Results found: 2

Search results

Sort By:

Limit search:

Geometric correction of APEX hyperspectral data

100%

Vreys K., Iordache M.-D., Biesemans J., Meuleman K.

Miscellanea Geographica. Regional Studies on Development

2016

vol. 20

issue 1

11-15

Hyperspectral imagery originating from airborne sensors is nowadays widely used for the detailed characterization of land surface. The correct mapping of the pixel positions to ground locations largely contributes to the success of the applications. Accurate geometric correction, also referred to as “orthorectification”, is thus an important prerequisite which must be performed prior to using airborne imagery for evaluations like change detection, or mapping or overlaying the imagery with existing data sets or maps. A so-called “ortho-image” provides an accurate representation of the earth’s surface, having been adjusted for lens distortions, camera tilt and topographic relief. In this paper, we describe the different steps in the geometric correction process of APEX hyperspectral data, as applied in the Central Data Processing Center (CDPC) at the Flemish Institute for Technological Research (VITO, Mol, Belgium). APEX ortho-images are generated through direct georeferencing of the raw images, thereby making use of sensor interior and exterior orientation data, boresight calibration data and elevation data. They can be referenced to any userspecified output projection system and can be resampled to any output pixel size.

Atmospheric correction of APEX hyperspectral data

76%

Sterckx S., Vreys K., Biesemans J., Iordache M.-D., Bertels L., Meuleman K.

Miscellanea Geographica. Regional Studies on Development

2016

vol. 20

issue 1

16-20

Atmospheric correction plays a crucial role among the processing steps applied to remotely sensed hyperspectral data. Atmospheric correction comprises a group of procedures needed to remove atmospheric effects from observed spectra, i.e. the transformation from at-sensor radiances to at-surface radiances or reflectances. In this paper we present the different steps in the atmospheric correction process for APEX hyperspectral data as applied by the Central Data Processing Center (CDPC) at the Flemish Institute for Technological Research (VITO, Mol, Belgium). The MODerate resolution atmospheric TRANsmission program (MODTRAN) is used to determine the source of radiation and for applying the actual atmospheric correction. As part of the overall correction process, supporting algorithms are provided in order to derive MODTRAN configuration parameters and to account for specific effects, e.g. correction for adjacency effects, haze and shadow correction, and topographic BRDF correction. The methods and theory underlying these corrections and an example of an application are presented.

Refine search results

2 Miscellanea Geographica. Regional Studies on Development

2 Biesemans J.

2 Iordache M.-D.

2 Meuleman K.

2 Vreys K.

1 Bertels L.

1 Sterckx S.

2 2016

Search results

Geometric correction of APEX hyperspectral data

Atmospheric correction of APEX hyperspectral data