524
September 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
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Membership is open to any person actively engaged in
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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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You may not be able to travel to Jezero Crater on Mars, but you can visit the next
best thing: Lake Salda, Turkey. Though it is located a world away, Lake Salda
shares similar minerology and geology as the dry Martian lakebed.
Researchers are using their understanding of Lake Salda to help guide the Mars
2020 mission, which will drop the Perseverance rover into the crater to search for
signs of ancient life. “One of the great things about visiting Lake Salda is it really
gives you a sense of what it would have been like to stand on the shores of an-
cient Lake Jezero,” said Briony Horgan, a planetary scientist at Purdue University
and member of the Perseverance science team.
Jezero is a 45-kilometer (28-mile) wide ancient impact crater located in the north-
west corner of a larger impact basin on Mars—essentially an impact crater within
an impact crater. It is noteworthy because it once contained a lake, as evidenced
by delta deposits. Previously, scientists discovered carbonate minerals throughout
the crater. Using data taken by NASA’s Mars Reconnaissance Orbiter (MRO),
Horgan and her team recently discovered evidence that some of these carbonate
minerals may have formed in the lake.
“Carbonates are important because they are really good at trapping anything that
existed within that environment, such as microbes, organics, or certain textures
that provide evidence of past microbial life,” said Brad Garczynski, a graduate
student at Purdue who works with Horgan. “But before we go to Jezero, it is really
important to gain context on how these carbonates form on Earth in order to focus
our search for signs for life.”
It just so happens that Lake Salda is the only known lake on Earth that contains
the carbonates and depositional features (deltas) similar to those found at Jezero
Crater. The black and white inset image shows Jezero Crater as observed by
MRO’s Context Camera. Spectral data showed signatures of carbonates on the
western edge of the crater, which scientists believe to be the shoreline and
beaches of an ancient lake. The carbonates are also present in the delta, which is
the planned site of the Perseverance landing.
The background image shows Lake Salda on June 8, 2020, as observed by the
Operational Land Imager (OLI) on Landsat 8. The lake contains alluvial fans full of
rock deposits eroded and washed down from the surrounding bedrock (similar to
the delta in Jezero). By studying how material is deposited in Lake Salda, the team
can learn more about the various depositional processes at Lake Jezero.
The white shoreline around Lake Salda is comprised of sands and gravels that are
dominated by hydromagnesite, which is similar to the carbonate minerals detected
at Jezero. Horgan explained that the hydomagnesite sediments along Lake Salda’s
shoreline are thought to have eroded from large mounds called “microbialites”—
rocks formed with the help of microbes. In Lake Salda, they formed from microbial
mats that lived just beneath the surface of the water near the shoreline. As the
microbialities grew, they incorporated carbonate materials and created large
terrace islands.
Visit
to see an image of
the terrace island in Lake Salda.
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