PE&RS October 1996

Cover Image

This composite shows two sample base products created by the Commercial Remote Sensing System (CRSS) under development by Raytheon E-Systems. The backdrop and top two inserts show the automatic results of processing a SPOT stereo pair of the central Andes Mountains through bundle adjustment, DEM extraction, and orthorectification. The bottom insert shows a high resolution final orthophoto of Atlanta at 0.8m ground sample distance. Despite their complexity, these products were produced with limited operator involvement and less that one hour of processing time. The CRSS is a scalable multi-source ground processing environment designed for automated large volume production. Based on over 20 years of production remote sensing systems experience, the CRSS features a complete photogrammetric solution for metric quality processing from image reconstruction through DEM and orthophoto generation. Source imagery may be ingested and ar-chived by direct downlink, magnetic media, or film digitization-using both existing image archives and tomorrow's high resolution satellite data. The initial site for the CRSS will be Space Imaging, Inc. For information contact Richard Adams at 214-205-5124. Atlanta source data courtesy of Space Imaging. © CNES/SPOT Image 1996.

Peer-Reviewed Articles (Click the linked titles to see the full abstract)

1145 The Sign Permutation in the Rotation Matrix and the Formulation of the Collinearity and Coplanarity Equations
Tian-Yuan Shih

The confusing signs of the principal distances are experienced more often in close-range applications than in aerial projects, due to the irregularity of exterior orientation configurations frequently encountered in close-range projects. 

1151 Using Theoretical Intensity Values as Unknowns in Multiple-Patch Least-Squares Matching
Amnon Krupnik

The process provided results equivalent to or better than those from classical least-squares matching and at a lower cost in terms of computation time. 

1157 A Fast Solution to Local Viewshed Computation Using Grid-Based Digital Elevation Models
Jianjun Wang, Gary J. Robinson, and Kevin White

A combination of sightline analysis and the relationships between the local surfaces at the source and des-tination points is employed. 

1165 Comparison of Derivative Topographic Surfaces of a DEM Generated from Stereoscopic SPOT Images with Field Measurements
Philip T. Giles and Steven E. Franklin

The main problem is that in most cases accurate comparison data for derivatives of elevation do not exist, and a digital product is used without knowing its accuracy. 

1173 Geometric Correction of SPOT and Landsat Imagery: A Comparison of Map- and GPS-Derived Control Points
N.G. Kardoulas, A.C. Bird, and A.I. Lawan

An RMS error in positional accuracy on the order of 35 metres was obtained consistently with both map and GPS control when applied to Landsat MSS, Landsat TM, and SPOT Pan imagery and assessed with independent check points. 

1179 Cross-Validated Assessment of Geometric Accuracy
Kenneth C. McGwire

A cross-validation technique is shown capable of providing more accurate estimates of geometric error than the traditional method of using transformation residuals when modest numbers of ground control points are available. 

1189 Experiences with the Production of Digital Orthophotos
Joachim Höhle

Each step of the production process is illustrated in detail, and experience regarding the choice of parameters in the calculation programs is stated.

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Meeting: GIS/LIS '97
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