PE&RS April 1999

Cover Image

This month’s cover image shows Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data acquired by Jet Propulsion Laboratory in October 1994 and processed by Analytical Imaging and Geophysics, Boulder, Colorado using ENVI®, the "Environment for Visualizing Images". The central image is a 3-dimensional perspective view of an AVIRIS true-color composite image fused with a color-coded USGS Digital Elevation Model (DEM). The AVIRIS data shown here cover an approximately 10 x 20 km swath looking south over Golden, Colorado, at 20 meter spatial resolution in 224 narrow (~10 nm-wide) spectral bands. The upper (X) profile shows a topographic cross section through the 3-D perspective along the corresponding black marker line. The left (Y) profile shows a similar topographic cross section through the perspective in an orthogonal direction. The inset (Z) profile shows an AVIRIS spectrum from a historic kaolinite mine compared to a USGS laboratory spectrum of kaolinite. The combination of the DEM with the hyperspectral AVIRIS data provides a unique linked N-dimensional perspective into the geologic composition and geomorphology. Data such as these are being used to study landslides and swelling soils, mineralogy and facies variation, and to map the general geology of the area.

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. Analytical Imaging and Geophysics can be contacted at www.aigllc.com. An MPEG animation of these data is available at www.envi-sw.com.

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

443 The Continuum of Classification Fuzziness in Thematic Mapping
Giles M. Foody

It is shown that the conventional "hard" classifications may be less appropriate than fuzzy classifications and that a continuum of classification fuzziness can be defined.

453 Automatic Lineament Detection Using Digital Elevation Models with Second Derivative Filters
David Wladis

A grid operator designed for the analysis of potential field data has been applied successfully to a digital elevation model for the detection of lineaments.

459 Semiautomatic Extraction of Building Outlines from Large-Scale Aerial Images
Liora Sahar and Amnon Krupnik

The approach comprises stereo analysis for extracting building heights, along with a general knowledge of building geometry and shadow information.

467 Digital Photogrammetric Change Analysis as Applied to Active Coastal Dunes in Michigan
Daniel G. Brown and Alan F. Arbogast

Employing two sets of panchromatic stereographic aerial photographs taken 22 years apart, processes of dune development, movement, and "blowout" were identifiable and measurable.

475 Change Analysis in the United Arab Emirates: An Investigation of Techniques
Terry L. Sohl

Specific quantitative values of change were most accurately and easily provided by the enhanced image-differencing technique, while the change-vector analysis excelled at providing rich qualitative detail about the nature of a change.

485 Remotely Sensed Estimates of Vegetation Structural Characteristics in Restored Wetlands, Southern California
Stuart R. Phinn, Douglas A. Stow, and David Van Mouwerik

The use of high spatial resolution airborne images and hand-held radiometer data for estimating parameters of vegetation structure in restored wetlands is described.

495 Indications of Relative Drought Stress in Longleaf Pine from Thematic Mapper Data
John E. Pinder III and Kenneth W. McLeod

Spatial variation in the ratios of reflectances for bands 5 and 4 from before, during, and after a severe drought were correlated with spatial variation in the reductions in treering growth rates for pines.

Announcements
420 Correction
439 Certification List - Corrections
422 1999 ASPRS Annual Conference
434 Pecora 14/Land Satellite Information III Call for Papers
474 Call for Papers: African Applications

Columns & Updates
436 In Memoriam-Varess
423 Grids & Datums-Hungary
427 Photogrammetry
431 Industry News

Departments
438 Who’s Who in ASPRS
439 New Members
440 Sustaining Members
442 Index to Advertisers
452 Instructions to Authors
466 Forthcoming Articles
502 Calendar
503 Classifieds
506 Professional Directory
511 Bookstore
515 Membership Application

Top

Home