PE&RS May 2020 Public - page 264

264
May 2020
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
PHOTOGRAMMETRIC
ENGINEERING &
REMOTE SENSING
J
ournal
S
taff
Publisher ASPRS
Editor-In-Chief Alper Yilmaz
Assistant Editor Jie Shan
Assistant Director — Publications Rae Kelley
Electronic Publications Manager/Graphic Artist
Matthew Austin
Photogrammetric Engineering & Remote Sensing
is the official journal
of the American Society for Photogrammetry and Remote Sensing. It is
devoted to the exchange of ideas and information about the applications of
photogrammetry, remote sensing, and geographic information systems. The
technical activities of the Society are conducted through the following Technical
Divisions: Geographic Information Systems, Photogrammetric Applications,
Lidar, Primary Data Acquisition, Professional Practice, and Remote Sensing
Applications. Additional information on the functioning of the Technical
Divisions and the Society can be found in the Yearbook issue of
PE&RS.
Correspondence relating to all business and editorial matters pertaining
to this and other Society publications should be directed to the American
Society for Photogrammetry and Remote Sensing, 425 Barlow Place, Suite
210, Bethesda, Maryland 20814-2144, including inquiries, memberships, sub-
scriptions, changes in address, manuscripts for publication, advertising, back
issues, and publications. The telephone number of the Society Headquarters is
301-493-0290; the fax number is 225-408-4422; web address is
PE&RS.
PE&RS
(ISSN0099-1112) is published monthly by the American
Society for Photogrammetry and Remote Sensing, 425 Barlow Place, Suite
210, Bethesda, Maryland 20814-2144. Periodicals postage paid at Bethesda,
Maryland and at additional mailing offices.
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, ASPRS Headquarters,
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MEMBERSHIP.
Membership is open to any person actively engaged in
the practice of photogrammetry, photointerpretation, remote sensing and
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is interested in the application or development of these arts and sciences.
Membership is for one year, with renewal based on the anniversary date of the
month joined. Membership Dues include a 12-month electronic subscription to
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COPYRIGHT 2020.
Copyright by the American Society for Photogrammetry
and Remote Sensing. Reproduction of this issue or any part thereof (except
short quotations for use in preparing technical and scientific papers) may be
made only after obtaining the specific approval of the Managing Editor. The
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Surrounded by lush vegetation and rare butterflies, the San Rafael Waterfall
was one of the most captivating landscapes in Ecuador. With water dropping
150 meters (490 feet), the river and falls cut through a thick patch of cloud
forest at the intersection of the Andes Mountains and the Amazon Basin. As
the country’s tallest waterfall, it attracted tens of thousands of visitors per year.
But now, the cascade has disappeared. It stopped flowing on February 2, 2020.
The images above show the falls and the surrounding river basin while water still
flowed on August 4, 2014 (left) and after it stopped on March 15, 2020 (right).
These images were acquired by the Operational Land Imager (OLI) on Landsat 8.
The image below shows a photograph of the falls on November 28, 2012.
According to media reports, a huge sinkhole appeared in the Coca River a few
meters before the falls and diverted the watercourse. Now, the water falls in
three separate sections and at a less steep slope, which cannot be seen from
viewing stations located around the original waterfall. Researchers believe the
three streams could cause erosion at the channel’s origin and create a river
upstream, which might change the topography of the valley.
The cause of the sinkhole is under investigation. Some geologists think the
deformation occurred naturally, while other researchers suspect it may be tied
to the new construction of the country’s largest hydroelectric plant. No matter
the cause, Ecuador’s tourism ministry does not plan to reconstruct the riverbed
or restore San Rafael. The waterfall is now part of history.
NASA Earth Observatory image by Lauren Dauphin, using Landsat data from
the U.S. Geological Survey. Photograph courtesy of Ecuador Ministry of Tourism
via CC BY-SA 2.0. Story by Kasha Patel.
For more information, visit
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