PE&RS July 1999

Cover Image

This month’s cover image shows renderings of 224-band Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) hyperspectral data acquired by the Jet Propulsion Laboratory in the northwest corner of Yellowstone National Park in August of 1996 (top, high altitude collect) and October of 1998 (bottom, low altitude collect). Analytical Imaging and Geophysics, of Boulder, Colorado orthorectifed and processed the imagery. The data were merged with a USGS Digital Raster Graphics file and mosaicked to create this display using ENVI®, the "Environment for Visualizing Images." The top image was acquired from an altitude of 60,000 feet from NASA’s ER-2 aircraft. It has a nominal pixel size of 17 meters. The bottom image was acquired as part of the AVIRIS Low Altitude Experiment, collected from NOAA’s Twin Otter flying at 12,500 feet. These data have a nominal cross-track pixel size of 1.7 meters. The bottom image is fully orthorectifed and projected to a UTM NAD-27 system, then merged with the USGS DRG image. Incorporation of a Boeing C-MIGITS® GPS/INS system in AVIRIS permits precision geocoding. The imaged area, near the confluence of Soda Butte Creek and the Lamar River, is a study site in a NASA-sponsored EOCAP project led by Yellowstone Ecosystem Studies of Bozeman, Montana. The multi-sensor, multi-resolution, multi-temporal research project is investigating the utility of hyperspectral imagery for riparian ecology studies.

For additional information about ENVI, contact Research Systems Inc., 303-786-9900; envi@rsinc.com or www.rsinc.com. ENVI is a registered trademark of Better Solutions Consulting LLC. Other contact information: Analytical Imaging and Geophysics www.aigllc.com; AVIRIS makalu.jpl.nasa.gov; Yellowstone Ecosystem Studies www.yellowstone.org; NASA EOCAP www.crsp.ssc.nasa.gov and Boeing C-MIGITS® www.boeing.com/defense-space/infoelect/insgps/cmigitps.htm.

Highlight Article

740 Is Photogrammetry Still Relevant? (Adobe PDF 1.75Mb)
Edward M. Mikhail

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

767 Introduction to Special Issue (Adobe PDF 371Kb)
Dr.-Ing. Eberhard Gülch and Helmut Mayer

769 Mapping by Dragging and Fitting of Wire-Frame Models
George Vosselman and Henri Veldhuis

A new approach for the interactive alignment of parametrized objects models to images is presented.

777 Automatic Road Extraction Based on Multi-Scale, Grouping, and Context
Albert Baumgartner, Carsten Steger, Helmut Mayer, Wolfgang Eckstein, and Heinrich Ebner

The technique makes use of the same aerial image with different resolutions, explicit knowledge about roads, and local context.

787 Virtual City Models from Laser Altimeter and 2D Map Data
Norbert Haala and Claus Brenner

An approach using 2D ground plans and a laser digital surface model to derive 3D building geometry automatically is presented, wherein texture is taken from terrestrial photographs.

797 Objects with Fuzzy Spatial Extent
Tao Cheng and Martien Molenaar

The reasons for the fuzzy spatial extent of objects is investigated and an approach to map the spatial extent of objects and their uncertainties is proposed.

803 Automatic Matching of Buildings and Corners
Han-Wen Hsiao and Kam W. Wong

The two vector files to be matched may have different scales, different coordinate systems, and no identifying cartographic labels.

811 Knowledge-Based Interpretation of Remote Sensing Images Using Semantic Nets
R. Tönjes, S. Growe, J. Bückner, and C.-E. Liedtke

The system uses a priori knowledge about landscape scenes and specific map knowledge from a GIS.

823 Extracting 3D Information Using Spatio-Temporal Analysis of Aerial Image Sequences
Guoqing Zhou

Experimental results show that the method is a useful tool for solving the problems of depth discontinuities and occlusions.

Announcements
751 June Cover Correction
764 Certification List—Update
766 Resource ‘99—Update
785 Call for Papers: Geospatial Information in Agriculture and Forestry
795 Call for Papers: African Applications
796 ISPRS Awards Nominations
810 Call for Papers: Remote Sensing for Marine and Coastal Environments
802 Pecora 14/Land Satellite Information III

Columns & Updates
754 Grids & Datums — Honduras
757 Industry News

Departments
753 Radar Manual Book Review
761 Who’s Who in ASPRS
762 Sustaining Members
764 New Members
765 Index to Advertisers
768 Instructions to Authors
786 Forthcoming Articles
822 Calendar
833 Classifieds
837 Bookstore
841 Professional Directory
845 Membership Application

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