PE&RS June 1996

Cover Image

The cover image and overlay graphics illustrate the near-real-time 2- and 3- dimensional feature extraction of man-made and natural features. A single feature tool was used to extract the small portion of the marina depicted in blue (2 mins. operator time, 30 secs. CPU time). A rooftop tool combined with an automatic volume generation algorithm extracted the buildings in red (~10 mins. operator time). An edge and road refinement tool captured the roads in yellow (~40 mins. operator time). An advanced model-based extraction tool was used to delineate 85 dwellings in green (~50 secs. operator time, 12.5 mins. CPU time). The Highlight Article in this issue (pp 671-4) further discusses these tools developed by GDE Systems, Inc. and Helava Associates (GDE subsidiary), San Diego, CA as part of their SOCET SET® Softcopy Photogrammetric System development. The imagery is a color aerial photograph of Port Hueneme, CA taken with a Wild RC-20 equipped with FMC at an altitude of 1,680 ft. AMSL and provided by Aerial Photo mapping Services, Clovis, CA. The photograph was converted to a color digital image using an Helava DSW200 scanner.

Highlight Article

671 Automated Feature Extraction: The Key to Future Productivity
Lawrence Firestone, Suzanne Rupert, James Olson, and Walter Mueller

Special Issue on Softcopy Photogrammetry

675 Foreword: Photogrammetry and the Quest for Digitization

Commentaries

679 Digital Photogrammetry: Challenge and Potential
F. Ackermann

680 From the Kelsh to the Digital Photogrammetric Workstation, and Beyond
Edward M. Mikhail

681 Market and Economics of Digital Photogrammetric Systems
Ian Dowman

682 Current Status and Future Directions of Digital Photogrammetry: A Personal View
Toni Schenk

683 Status, Prospects, and the Profession
Kennert Torlegard

684 Softcopy Photogrammetry and GIS
E. Lynn Usery

685 At What Price Inaccuracy?
Bryan J. Logan

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

687-694 Tone Reproduction of Photographic Scanners
O. Kölbl and U. Bach

Scanners most commonly used in photogrammetry and the printing industry were tested, but their efficiency does not allow them to fully exploit the high image quality of modern aerial photographs.  

695-701 A Comparison of Two Image Compression Techniques for Softcopy Photogrammetry
Kurt Novak and Fayez S. Shahin

The standard Joint Photographic Expert Group (JPEG) algorithm and the newly developed Hierarchi-cal Predictive Coding (HPC) approach were compared with respect to geometric quality, loss of infor-mation, compression ratio, and compression speed.  

703-710 Automated Aerotriangulation Using Multiple Image Multipoint Matching
Peggy Agouris and Toni Schenk

A strategy has been developed to identify and precisely match conjugate points in the triple, qua-druple, or multiple overlapping areas of the block, thus providing a single digital process which al-lows automation of the mensuration and adjustment phases of classical aerotriangulation.  

711-717 Concept, Implementation, and Results of an Automatic Aerotriangulation System
Charles K. Toth and Amnon Krupnik

A softcopy-based automatic aerotriangulation system that generates the block configuration, selects block points (tie points), and matches them to sub-pixel accuracy is described.  

719 - A Digital System for Surface Reconstruction
Weiyang Zhou, Robert H. Brock, and Paul F. Hopkins

A digital photogrammetric system, STEREO, which demonstrated a high degree of automation and whose operation does not require special knowledge of photogrammetry, computers, or image pro-cessing, was developed to determine three-dimensional coordinates of points defined with a grid on a textureless, smooth-surfaced specimen.

727 - Digital Terrain Model (DTM) from Indian Remote Sensing (IRS) Satellite Data from the Overlap Area of Two Adjacent Paths Using Digital Photogrammetirc Techniques
T. Ch. Malleswara Rao, K. Venugopala Rao, A. Ravi Kumar, D. P. Rao, and B. L. Dekkshatula

733 - The Digital Transferscope
Eugene E. Derenyi

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