PE&RS April 1997

Cover Image

This digital terrain model of Seattle's Kingdome was created using data collected by Airborne Laser Mapping (ALM) of Bremerton, Washington. Using Optech's ALTM (Airborne Laser Terrain Mapping system) while surveying downtown Seattle, ALM collected data at a capture rate of 4,000 elevation points/sec. with an elevation accuracy of 15 cm. Optech's compact ALTM is mounted in a standard camera port in ALM's Twin Bonanza. ALM's data, processed by specialized software, produced 40,257 absolutely referenced elevation points. Flown at night, the survey was completed in one hour. Post-processing times are typically 3-4 hours for every hour of data collected. For additional information, see the Highlight Article, page 327, or contact Optech, 416-661-5904.

Photo of Kingdome courtesy of Walker & Associates, Seattle. The photo was taken at an altitude of 2,500 ft. using a Zeiss RMK A 15/23 camera.

Highlight Article

327-329, 363-366 Commercial Implications of Topographic Terrain Mapping Using ScanningAirborne Laser Radar (Adobe PDF 1.55Mb)
Martin Flood and Bill Gutelius

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

367-370 Map Conversion and the UTM Grid
Frederick J. Doyle

Problems related to datum and coordinate conversion, UTM map grids, International Terrestrial Reference Frame, and terrain elevations derived from GPS survey techniques are reviewed.  

371-375 Datum Shifts for UTM Coordinates
R. Welch and A. Homsey

Because rectangular grid coordinates are preferred for a majority of tasks, it is recommended that the national mapping agencies determine the shift values to convert the NAD 27 UTM coordinates of individual map sheet corners to the datum of choice.  

377-380 The Gridded Map
Alden P. Colvocoresses

The evolution of hand-held GPS units capable of delivering position accuracies to better than 10 m makes large-scale map gridding an item of immediate concern.

381-383 Field Validation of the UTM Gridded Map
N.G. Terry, Jr.

A full UTM grid on a map allowed coordinates to be measured quickly with a pocket-size coordinate reader to accuracies of approximately 10 m, as compared to 100 m when the map had only marginal UTM tick marks.  

385-392 A Simulation Comparison of Three Marginal Area Estimators for Image Classification
Ding Yuan

Three marginal area estimators, including the direct estimator, inverse estimator, and additive estimator for image classification, were compared using Monte Carlo simulations.  

393-395 Quality Assessment of Polygon Labeling
Gerardo Bocco and Hugo Riemann

The approach uses the geometric distribution where the sample size is a function of the desired confidence level of the database.  

397-402 Sensitivity of Selected Landscape Pattern Metrics to Land-Cover Misclassification and Differences in Land-Cover Composition
James D. Wickham, Robert V. O'Neill, Kurt H. Riitters, Timothy G. Wade, and K. Bruce Jones

Comparison of sensitivity and regression results suggests that differences in land-cover composition need to be about 5 percent greater than the misclassification rate to be confident that differences in landscape metrics are not due to misclassification.  

403-414 Evaluating the Uncertainty of Area Estimates Derived from Fuzzy Land-Cover Classification
Frank Canters

Using different strategies for image segmentation, it is shown that the spatial correlation of classification uncertainty has a major impact on the assessment of the uncertainty of area estimates.

415-424 Effect of Database Errors on Intervisibility Estimation
Ronald E. Huss and Mark A. Pumar

Digital terrain databases are very good for predicting masking but are less reliable for predicting visibility.  

425-434 Exploring and Evaluating the Consequences of Vector-to-Raster and Raster-to-Vector Conversion
Russell G. Congalton

The presence/absence as well as shape retention of the data during the conversion process were addressed.

Announcements
Meeting: Softcopy Photogrammetry Applications
Meeting: Space Congress & Exhibition `97
New PE&RS Associate Editors
Meeting: A/E/C Systems `97
NAPA Open Forum
Meeting: 3rd International Airborne Remote Sensing Conference and Exhibition
Call for Papers: 1997 Applied Imagery Pattern
Recognition Workshop
IGIF Spring 1997 Newsletter

Columns & Updates
In Memoriam — Amrom Katz
ASPRS Division and Committee Updates

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