scholarly journals Structure-From-Motion Photogrammetry of Antarctic Historical Aerial Photographs in Conjunction with Ground Control Derived from Satellite Data

2020 ◽  
Vol 13 (1) ◽  
pp. 21
Author(s):  
Sarah F. Child ◽  
Leigh A. Stearns ◽  
Luc Girod ◽  
Henry H. Brecher
Keyword(s):  
Data Collection ◽  
Structure From Motion ◽  
Temporal Scale ◽  
Aerial Imagery ◽  
Aerial Photographs ◽  
Aerial Image ◽  
Ground Control ◽  
In Situ Data ◽  
Glacier Dynamics

A longer temporal scale of Antarctic observations is vital to better understanding glacier dynamics and improving ice sheet model projections. One underutilized data source that expands the temporal scale is aerial photography, specifically imagery collected prior to 1990. However, processing Antarctic historical aerial imagery using modern photogrammetry software is difficult, as it requires precise information about the data collection process and extensive in situ ground control is required. Often, the necessary orientation metadata for older aerial imagery is lost and in situ data collection in regions like Antarctica is extremely difficult to obtain, limiting the use of traditional photogrammetric methods. Here, we test an alternative methodology to generate elevations from historical Antarctic aerial imagery. Instead of relying on pre-existing ground control, we use structure-from-motion photogrammetry techniques to process the imagery with manually derived ground control from high-resolution satellite imagery. This case study is based on vertical aerial image sets collected over Byrd Glacier, East Antarctica in December 1978 and January 1979. Our results are the oldest, highest resolution digital elevation models (DEMs) ever generated for an Antarctic glacier. We use these DEMs to estimate glacier dynamics and show that surface elevation of Byrd Glacier has been constant for the past ∼40 years.

In-situ data collection at the photon factory macromolecular crystallography beamlines

2016 ◽  
Author(s):  
Yusuke Yamada ◽  
Masahiko Hiraki ◽  
Naohiro Matsugaki ◽  
Ryuichi Kato ◽  
Toshiya Senda
Keyword(s):  
Data Collection ◽  
Macromolecular Crystallography ◽  
Photon Factory ◽  
In Situ Data

scholarly journals Chemical sensors for in situ data collection in the cryosphere

2016 ◽  
Vol 82 ◽  
pp. 348-357 ◽  
Author(s):  
Elizabeth A. Bagshaw ◽  
Alexander Beaton ◽  
Jemma L. Wadham ◽  
Matt Mowlem ◽  
Jon R. Hawkings ◽  
...  
Keyword(s):  
Data Collection ◽  
Chemical Sensors ◽  
In Situ Data

scholarly journals Indian moored observatory in the Arctic for long-term in situ data collection

2016 ◽  
Vol 7 (2) ◽  
pp. 55-61 ◽  
Author(s):  
R Venkatesan ◽  
KP Krishnan ◽  
M Arul Muthiah ◽  
B Kesavakumar ◽  
David T Divya ◽  
...  
Keyword(s):  
Data Collection ◽  
The Arctic ◽  
In Situ Data

Novel combined crystallization plate for high-throughput crystal screening and in situ data collection at a crystallography beamline

2021 ◽  
Vol 77 (9) ◽  
pp. 319-327
Author(s):  
Miao Liang ◽  
Li Yu ◽  
Zhijun Wang ◽  
Huan Zhou ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Data Collection ◽  
High Throughput ◽  
Diffraction Data ◽  
Large Scale ◽  
Liquid Drop ◽  
In Situ Data ◽  
Combined Crystallization ◽  
Manual Manipulation ◽  
Large Scale Screening

In situ microplates are small in size, crystal cultivation and operation are difficult, and the efficiency of crystal screening is relatively low. To solve this problem, a novel combined crystallization plate was designed for high-throughput crystal cultivation and in situ data collection. A frame was used to hold 48 in situ microplates, and the in situ microplates were sealed on one side with an ultralow background-scattering Kapton film. An automatic liquid handler (Mosquito) was used to add a liquid drop to the in situ microplates in the frame, and CrystalClear HD tape was used to seal the frame. A sealed frame holding 48 microplates was developed as a novel combined crystallization plate and was used for crystal cultivation under different conditions and in situ data collection at the synchrotron beamline. Moreover, individual microplates can be separated from the combined crystal plate and then fixed on a magnetic base or loaded onto a UniPuck for in situ data collection. Automatic grid scanning was used to locate crystals. The efficiency of the combined crystallization plate for crystal screening was verified. This method avoids the manual manipulation of crystals during crystal screening and diffraction data collection; therefore, the combined crystallization plate is suitable for large-scale screening of microcrystals.

scholarly journals From Archived Historical Aerial Imagery to Informative Orthophotos: A Framework for Retrieving the Past in Long-Term Socioecological Research

2019 ◽  
Vol 11 (11) ◽  
pp. 1388 ◽  
Author(s):  
Ana Teresa Pinto ◽  
José A. Gonçalves ◽  
Pedro Beja ◽  
João Pradinho Honrado
Keyword(s):  
Land Cover ◽  
Aerial Imagery ◽  
Aerial Photographs ◽  
Ground Control ◽  
High Definition ◽  
The Past ◽  
Control Information ◽  
Image Orientation ◽  
Land Cover Maps

Aerial photographs have been systematically collected from as early as the 1930s, providing a unique resource to describe changes in vegetation and land cover over extended periods of time. However, their use is often limited by technical constraints, such as the lack of ground control information and precise camera parameters, which hamper an accurate orthorectification of the raw imagery. Here, we describe the historical aerial photographs orthorectification (HAPO) workflow, based on a conventional photogrammetric procedure (the direct linear transformation (DLT) Method), integrated as a geographic information systems (GIS) procedure, in order to perform the image orientation and orthorectification, thereby converting historical aerial imagery into high-definition historical orthoimages. HAPO implementation is illustrated with an application to a rugged landscape in Portugal, where we aimed to produce land-cover maps using an aerial photograph coverage from 1947, as part of a study on long-term socioecological dynamics. We show that HAPO produces highly accurate orthoimages and discuss the wider usefulness of our framework in long-term socioecological research.

IN-SITU DATA COLLECTION/MONITORING FOR MODELING THE FINAL SETTLING TANK (FSTs) AT WARDS ISLAND WPCP-BATTERY “E”

2007 ◽  
Vol 2007 (2) ◽  
pp. 311-336
Author(s):  
Krish Ramalingam ◽  
John Fillos ◽  
Allen Deur ◽  
Keith Beckmann
Keyword(s):  
Data Collection ◽  
Settling Tank ◽  
In Situ Data

scholarly journals ESRF/DBT/EMBL:BM14-2: MX station for in situ, dehydration and MAD experiments

2014 ◽  
Vol 70 (a1) ◽  
pp. C323-C323
Author(s):  
Babu Manjasetty ◽  
Akim Khadrouche ◽  
Bernard Lavault ◽  
Franck Felissaz ◽  
Trevor Mairs ◽  
...  
Keyword(s):  
Data Collection ◽  
High Energy ◽  
Control Device ◽  
In Situ Data ◽  
Multiple Wavelength ◽  
Concomitant Reduction ◽  
Diffraction Patterns ◽  
To Come ◽  
Novel Devices

BM14 was the first dedicated macromolecular crystallography (MX) beamline to come into operation at the ESRF during 1995. This experimental station has been designed specifically to produce MX diffraction data using Single/Multiple-wavelength Anomalous Diffraction (SAD/MAD) methods (www.bm14.eu). Currently, beamline is operated by a consortium between the ESRF, the EMBL-Grenoble and the Department of Biotechnology (DBT), India. Recently, the beamline optics was fully upgraded (hence the new denomination BM14-2). A four-time increase in beam brilliance is achieved with the concomitant reduction in average exposure time (~5s today versus 20s before), leading to a substantial gain in the screening capacity. Upgrade includes a new channel-cut crystal equipped with a second crystal pusher to reject high-energy harmonics. The latter device turned to be crucial for Sulphur-SAD experiment success rate. The special goniometer head is installed on microdiffractometer (MD2) goniometer which is capable of handling the CrystalDirect (CD) nanocrystallisation plates [1] so that any crystallisation hit can be exposed to the beam. The plate characteristics are optimal for in situ data collection and they produce diffraction patterns with significantly reduced background. A newly designed dehydration-to-cryogenic nozzle-changer device is also installed in order to avoid the down time between the experiments (such as, In situ screening, humidity control device (HC1), standard cryogenic data collection). European users may apply for access via the Biostruct-X program (www.biostruct-x.eu) both for CD plate nanocrystallisation trials and for beamtime. Users from India are encouraged to apply from DBT-Portal (http://process.mbu.iisc.ernet.in/BM14/index.jsp) for beamtime. The optics hutch refurbishment and implementation of the novel devices in the experimental hutch opens promising perspectives for collecting data at room temperature and that are of importance to the MX users.

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