596
September 2017
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
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PHOTOGRAMMETRIC ENGINEERING
& REMOTE SENSING
J
ournal
S
taff
Publisher ASPRS
Editor-In-Chief Alper Yilmaz
Technical Editor Michael S. Renslow
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, subscriptions, changes
in address, manuscripts for publication, advertising, back issues, and publica-
tions. The telephone number of the Society Headquarters is 301-493-0290; the
fax number is 301-493-0208; web address is
.
PE&RS
.
PE&RS
(ISSN0099-1112) is published monthly by the American
Society for Photogrammetry and Remote Sensing, 5410 Grosvenor Lane, Suite
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COPYRIGHT 2017
. 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 Society
is not responsible for any statements made or opinions expressed in technical
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In 1912, physicist Theodore von Kármán first described a process that makes long,
spiraling cloud patterns in the sky. These so-called “von Kármán vortices” arise
when winds are diverted around a blunt, high-profile area, often an island rising
from the ocean. The alternating direction of rotation in the air forms swirls in the
clouds.
Satellites regularly spot these wind and cloud patterns around the world. On May
24, 2017, the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP
satellite captured a natural-color image of such swirls on the lee side of Guadalupe
Island. The volcanic island rises from the Pacific Ocean off the coast of Baja Cali-
fornia, Mexico.
According to Carlos Torres of the Autonomous University of Baja California, the
pattern of the swirls depends on the wind intensity. The vortices are driven by the
prevailing winds, which can change seasonally and cause differences in the direc-
tion and structure of the vortices.
NASA Earth Observatory images by Joshua Stevens and Jesse Allen, using Landsat
data from the U.S. Geological Survey and VIIRS data from the Suomi National Po-
lar-orbiting Partnership. Story by Kathryn Hansen.
Visit
for more
information.
