The integration of a digital elevation model in casi image geocorrection

Cosandier D., . and Ivanco T.A., . and Chapman M.A., . and Dylke M., . (1995) The integration of a digital elevation model in casi image geocorrection. [Proceedings Paper]

The Compact Airborne Spectographic Imager casi produces imagery rich with radiometric information. However this imagery must often be imported into a Geographic Information System and possibly merged with other feature information which requires that the imagery be accurately georeferenced. Due to the pushbroom methodology of the casi attitude and position parameters are required for each image scan line. Such data are more easily and accurately obtained via navigation sensors such as an Inertial Navigation Systems INS for roll pitch and yaw in addition to GPS for position information. These systems need to be calibrated and the orientational offset between INS and casi will have to be determined to precisely reference pixels on the ground. This accomplished via a specialized photogrammetric bundle adjustment making use of ground control points combined with conjugate points between overlapping images. To fully georeference the imagery the effect of height variations must also be removed from the imagery. For this a DEM of the mapping area is required and this paper discusses how the DEM is included in the image geocorrection accuracy can be within one or two pixels if proper techniques and navigation sensors are used. Moreover by using a modified casi sensor with forward and after viewing capabilities a DEM can be extracted directly from the imagery and used in the geocorrection process.

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Abstract

The Compact Airborne Spectographic Imager casi produces imagery rich with radiometric information. However this imagery must often be imported into a Geographic Information System and possibly merged with other feature information which requires that the imagery be accurately georeferenced. Due to the pushbroom methodology of the casi attitude and position parameters are required for each image scan line. Such data are more easily and accurately obtained via navigation sensors such as an Inertial Navigation Systems INS for roll pitch and yaw in addition to GPS for position information. These systems need to be calibrated and the orientational offset between INS and casi will have to be determined to precisely reference pixels on the ground. This accomplished via a specialized photogrammetric bundle adjustment making use of ground control points combined with conjugate points between overlapping images. To fully georeference the imagery the effect of height variations must also be removed from the imagery. For this a DEM of the mapping area is required and this paper discusses how the DEM is included in the image geocorrection accuracy can be within one or two pixels if proper techniques and navigation sensors are used. Moreover by using a modified casi sensor with forward and after viewing capabilities a DEM can be extracted directly from the imagery and used in the geocorrection process.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor. G70.5 A7S471 1995 Call Number
AGROVOC Term:	INTEGRATION
AGROVOC Term:	GEOGRAPHICAL INFORMATION SYSTEMS
AGROVOC Term:	GEOLOGISTS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:13
URI:	http://webagris.upm.edu.my/id/eprint/10943

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