The necessity of exterior orientation parameters for the rigorous geometric correction of MEIS-II airborne digital images

Conference · Fri Nov 01 04:00:00 EST 1996

OSTI ID:390702

Bannari, A; Morin, D ^[1]; Gibson, J R ^[2]

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1. Univ. de Sherbrooke, Sherbrooke, Quebec (Canada)
2. Canada Centre for Remote Sensing, Ottawa, Ontario (Canada)

The Canada Land Use Monitoring Program is attempting to replace aerial photographs by remote sensing imagery (satellite or airborne). The Canada Center for Remote Sensing (CCRS) is implementing an airborne multi-detector electro-optical imaging system (MEIS-II). The acceptance of airborne scanners has been slow principally due to poor spatial resolution and distortions induced by aircraft motion. To address this geometric problem, CCRS has developed a rigorous correction method based on fundamental photogrammetric principles (collinearity and coplanarity) and auxiliary navigation data (attitude, altitude and aircraft speed) measured in relation to time by an inertial navigation system (INS). The method can process images in monoscopy or stereoscopy. It uses primarily a low-order polynomial function for correcting auxiliary data based on the method of least squares and a few control points. The results are then used in the geometric correction procedure. In this study, we discuss the effect of geometric distortions caused by aircraft motion and we test two geometric correction methods. The first method is the one developed by CCRS mentioned above. The second method is based on a second order polynomial function. The effect of control point precision on the reliability of the geometric correction using geodetic points and other points derived from the 1/20 000 topographical map is examined. The results show a noticeable difference between the two approaches tested. The photogrammetric method, based on the condition of collinearity and coplanarity, and related to navigation data, results in precision in the order of one pixel with geodetic control points. The use of geodetic control points permits the elimination of the planimetric error characteristic of the topographical map. The polynomial method provides precision which is in the order of five pixels whatever the type and precision of the control points. 18 refs., 6 figs., 2 tabs.

• OSTI ID: 390702
• Report Number(s): CONF-960613--; CNN: P 000 5252
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS
AERIAL SURVEYING
AIRCRAFT
CANADA
CORRECTIONS
DATA PROCESSING
GEODETIC SURVEYS
IMAGE PROCESSING
IMAGE SCANNERS
INERTIAL GUIDANCE
LAND RESOURCES
LAND USE
MAPPING
MOTION
OPTICAL SCANNERS
SPACE DEPENDENCE
SPATIAL RESOLUTION
TOPOGRAPHY