PE&RS March 1999

Cover Image

This commercial satellite image composite, derived from 7 April 1998 pre-test and 29 May 1998 post-test Indian IRS-1C panchromatic imagery shows a one kilometer diameter zone of change (in red) highlighting the rockslides caused by Paksitan’s first nuclear test conducted in the Ras Koh mountain range on 28 May 1998. The image was formed by multi-control point co-registration of the two images via second order polynomial warping of the post-test image onto the pre-test image. Image subtraction detected changes, primarily rockslides, were tinted red and layered back onto the pre-test image.

Space Imaging, Inc., the sole distributor of IRS-1C imagery in the United States, provided the pre-test image. The use of the post-test image is courtesy of Science Application International Corporation. The insets, consisting of a 19 June 1998 oblique aerial view from Pakistan TV and an annotated 25 February 1998 Russian KVR-1000 (SPIN-2) satellite image of the test site, are courtesy of the Institute for Science and International Security (ISIS).

For more information, please see http://www.itc.nl/ags/ and http://www.spaceimaging.com/.

Highlight Article

218 Ordnance Survey Ireland and its Transition to Digital Photogrammetry (Adobe PDF 1.96Mb)
Michael J. Cory, Richard A. Kirwan, and A. Stewart Walker

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

249 Testing Camera Calibration with Constraints
Huang Youcai and Robert M. Haralick

Known geometric relationships between points, lines, and planes on a three-dimensional object can be used as constraints in the camera calibration process to improve the accuracy of estimates.

259 Parallel Image Processing Applied to Radar Shape-from-Shading
A. Goller, M. Gelautz, and F. Leberl

Advanced parallelization techniques applied to a time-consuming surface reconstruction algorithm lead to excellent performance on massive parallel computers and good results on a cluster of workstations.

269 The Analog-to-Digital Transition and Implications for Operational Use of Airborne Videography
Jung-Sup Um and Robert Wright

Recent advances in domestic consumer video technology and improvements in computing power indicate possibilities for overcoming the limitations of analog video.

277 Virtual Reality Applied to User Interfaces for Digital Photogrammetric Workstations
Michel Boulianne and Clément Nolette

A close-range photogrammetric system which monitors the operator’s hand is proposed as a natural imput device for softcopy photogrammetric workstations.

281 An Innovative Approach Using Digital Photogrammetry to Map Geology in the Porcupine Hills, Southern Alberta, Canada
Daniel Lebel and Ronald Da Roza

Photogrammetrically calculated bedding measurements augmented those measured in the field and allowed the geologist to delineate several previously unrecognized folds.

289 Contour Line "Ghosts" in USGS Level 2 DEMs
Peter L. Guth

Counter-to-grid algorithms produce more grid-node elevations with the same elevation as the contour lines compared to elevations different from contour line elevations.

Announcements
230 1999 ASPRS Annual Conference
239 ISPRS Awards
244 Pecora 14/Land Satellite Information III Call for Papers
288 Call for Papers: African Applications

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218 Headquarters News
232 Grids & Datums-Ireland
229 Industry News

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245 Who’s Who in ASPRS
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268 Instructions to Authors
276 Forthcoming Articles
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Resources'99 (formally The Directory of the Mapping Sciences)
308 Introduction
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375 Services Index
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399 U.S. Vendors
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406 ASPRS Code of Ethics

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