PE&RS May 1998

Cover Image

The cover image is a combination of geospatial data products. The base is an orthorectified image with overlayed vectors and an elevation matrix. The elevation data is portrayed as a shaded relief. These three data types provide the foundation information for most government and commercial geospatial data users. The data are used in combination, to better visualize the terrain of the area. The evolution and availability of flexible GIS software and more powerful systems has dramatically increased the use of this type of data. The data were produced by the National Imagery and Mapping Agency over the hill country in central Texas in the vicinity of Killeen, Texas. See www.nima.mil for geospatial data and information.

 MRJ Technology Solutions is internationally recognized for its quality assurance accomplishments for these and other types of digital data sets. MRJ develops software tools for the automatic and semi-automatic exploitation, inspection and production of geospatial data and provides a full range of geospatial services including analysis, system development, integration and training, and data production, inspection and integration. See www.mrj.com for more information about MRJ.

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

387 The Assessment of Sediment Transport Rates by Automated Digital Photogrammetry
M. Stojic, J. Chandler, P. Ashmore, and J. Luce

Derived elevation models were used in a variety of ways to provide data of geomorphological significance. 

397 Co-Registered Aerial Stereopairs from Low-Flying  Aircraft for the Analysis of Long-Term Tropical Rainforest Canopy Dynamics
Stanley R. Herwitz, Robert E. Slye, and Stephen M. Turton

A method for quantifying the turnover and crown growth rates of tropical rainforest canopy trees over an 18-year period using a temporal sequence of large-scale aerial stereopairs is described. 

407 Effects of Emergent Grass on Mid-Infrared  Laser Reflectance of Soil
Ram M. Narayanan and Brian D. Guenther

Reflectance ratios were plotted as a function of grass-blade height for different grass densities in experimental plots. 

415 Towards Development of a Snow Water Equivalence  (SWE) Algorithm Using Microwave Radiometry  Over Snow Covered First-Year Sea Ice
Sheldon D. Drobot and David G. Barber

Multiple regression techniques show promise as an effective avenue to pursue the development of SWE algorithms. 

425 Repeat-Pass Dual-Antenna Synthetic Aperture Radar  Interferometric Change-Detection Post-Processing
David A. Yocky and Benjamin F. Johnson

Deterministic post-processing techniques to identify false temporal changes in interferometric synthetic aperture radar coherent change maps are described. 

431 The Use of Census Data in Urban Image Classification
Victor Mesev

Census data, and census data in the form of interpolated surfaces within a GIS, were used to aid training sample selection, assist post-classification sorting, and modify the maximum-likelihood classifier.

Announcements
386 ISPRS Commission III Symposium
396 PE&RS Covers
396 Certification
405 Special Issue: Call for Papers
414 Call for Papers: ACM Symposium
423 Call for Nominations: 1998 William T. Pecora Award
424 Publication: Manual of Photographic Interpretation
430 Call for Abstracts:  1999 ASPRS Annual Conference
553 Publication: Digital Photogrammetry

Columns & Updates
359 Society: ASPRS Names James R. Plasker New Executive Director
361 Society: Alan M. Mikuni Elected ASPRS Vice President

Departments
364 PE&RS Readership Survey
378 ASPRS Board of Directors
380 Task Force Report
384 New Members
395 Forthcoming Articles
406 Instructions to Authors
437 Classifieds
440 Index to Advertisers
441 Calendar
443 Professional Directory
549 Bookstore
555 Membership Application

Directory of the Mapping Sciences
448 Introduction
449 Sustaining Members
451 Corporate Descriptions
517 Services Index
534 Products Index
541 Geographic Locations
542 U.S. Vendors
546 International Vendors
548 ASPRS Code of Ethics

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