IEEE Geoscience and Remote Sensing Society (GRSS), Bombay Chapter
Cordially invites you to IEEE GRSS Technical Talks by
Dr. Scott HensleyProject Scientist, NASA UAVSAR Program
Title: UAVSAR Measurements of Vegetation Parameters using PolInSAR and Tomographic TechniquesDate: 13th November 2018 @ CSRE Seminar Hall, 1st-floor CSRETime: 11:00 AM – 12:00 NoonAbstract: SAR polarimetric, interferometric and tomographic methods have proven extremely
adept at measuring vegetation vertical structure at a variety of wavelengths including L
and P-bands. Measuring the three-dimensional structure of vegetation and its changes
resulting from either natural or anthropogenic causes are key parameters in monitoring
ecosystems. The NASA/JPL UAVSAR system has deployed to multiple sites including
Alaska and Central America over the last several years to conduct polarimetric,
interferometric and tomographic SAR observations at L-band and P-band.
UAVSAR is a NASA/JPL L-band fully polarimetric synthetic aperture radar employing
an electronically scanned array whose primary design goal was to enable robust repeat
pass radar interferometric measurements of deforming surfaces either from natural or
anthropogenic causes. The radar is housed in a pod mounted to the fuselage of a
Gulfstream III jet. Electronic steering of the L-Band antenna is tied to the inertial
navigation unit so that consistent pointing is achieved regardless of the platform yaw.
The platform was modified to include a precision autopilot (PPA) that allows the aircraft
to fly a specified trajectory within a 5 m tube. This enables UAVSAR platform to fly a
series of flight lines with well-prescribed interferometric baselines. The radar can also be configured to as a P-band polarimetric radar or a Ka-band single pass interferometer.
Data from these sensors has been collected from many sites distributed around the world
and is freely available either from the JPL website uavsar.jpl.nasa.gov or through the
Alaska Satellite Facility (ASF).
This talk will provide a brief overview of PolInSAR and tomographic techniques for
vegetation parameter extraction and of UAVSAR experiments conducted in Central
America and in the boreal forests of Alaska where PolInSAR and tomographic
techniques have been employed to estimate vertical structure.
Title: Overview of the Proposed VERITAS Mission to VenusDate: 14th November 2018 @ CSRE Seminar Hall, 1st-floor CSRETime: 11:00 AM – 12:00 NoonAbstract: Venus stands out has having imaging and topographic data that lag the other terrestrial bodies by an order of magnitude both in terms of resolution and accuracy. Topographic data are a key piece of information for identifying and quantifying geological processes that have and continue to modify planetary surfaces and aid the establishment of the chronology of these processes. This lack of comparative topographic knowledge is a severe impediment to comparative planetology studies between Venus and terrestrial planets as well as to understanding and quantifying the physical processes that have shaped and continue to modify the surface. The Venus Emissivity, Radio Science, InSAR Topography and Spectroscopy (VERITAS) Mission is a proposed mission to Venus designed to obtain high resolution imagery and topography of the surface using an X-band radar configured as a single pass radar interferometer coupled with a multispectral NIR emissivity mapping capability.VERITAS, if flown, will map surface topography with a spatial resolution of 250 m and 5 m vertical accuracy and generate radar imagery with 30 m spatial resolution. These capabilities represent an order of magnitude or better improvement of the Magellan system and would be expected to reveal definitive information on processes not possible with the Magellan data. The combination of surface topography and image data provide unprecedented knowledge of Venus tectonic and impact history, the timing and mechanisms of volcanic resurfacing, and the mantle processes responsible for them. The proposed combination of instruments on VERITAS, and in particular the InSAR instrument, is designed to address a series of focused hypothesis driven questions left unresolved by the Magellan mission. Here we focus on the topographic mapping aspects of the mission. This talk will provide an overview this mission.
IEEE GRSS technical talks by Dr. Scott Hensley