View
292
Download
1
Category
Tags:
Preview:
Citation preview
Amelia FranklinPatrick CoronadoDirect Readout Laboratory, NASA Goddard Space Flight Center
Benefits of Geophysical Measurements Via Radar
Tell us a lot about Earth
Provide for countless applications (e.g. weather forecasting, agricultural productivity, etc.)
Good for monitoring/mapping (e.g. climate, soil moisture, sea surface temperature, etc.)
Benefits of Biomass Radar Remote Sensing
Provides much potential for discoveries and unplanned benefit
Allows for monitoring biomass over the entire planet (including hard to reach areas)
Direct assessment of ecosystem and environmental health
Radar Biomass Remote Sensing
Direct= measurement of biomass response to radar stimulus
Calling for increased use of directly measuring biomass using satellite radar remote sensing
Monitoring Ecosystem Health: Current Passive Methods
In-situ measurements Limited to human accessible areas Temporally and spatially limited
Inference-based measurements from mostly passive satellite instrument data Ex: Vegetation Index
Inference Based Measurements
Rely mostly on using geophysical measurements to infer biomass monitoring applications
Undeniably helpful, but can be used in conjunction with direct measurements
Proposing increased DIRECT measurement of biological features of vegetation via active radar
Monitoring Ecosystem Health Via Direct Measurements: Radar
Rehabilitation/Reclamation progress Restoration of disturbed areas
Ecosystem Stability Effects of human interaction/contact,
affecting new development decisions Overall Health of vegetation
Affecting health/population density of all living organisms
Benefits of Active Radar
Penetrate cloud, dust, smoke (specifically lower frequencies, e.g. L band)
Constant pulse
Raise target signal above noise from existing emissive and reflective radiation -strengthen accuracy of measurement
Stimulating Target Biology for bimodal response
Chlorophyll absorption
Fluorescence
AlternativeApplication Derivation Pathways
Soil Moisture Active Passive (SMAP)
Soil moisture grid on earth
Combines an active component and a passive component (L-Band)
Applications: Agricultural Productivity mapping, climate mapping (permafrost changes) …
Passive and active interaction with soil and vegetation
•Active has potential to provide bimodal responses or additional useful information• Active radar does not simply collect data on soil moisture but includes data on vegetation, terrain roughness, etc• Passive data collection has purest measurement of soil moisture (without other factors) and is therefore still useful
SMAP Mission NASA Workshop Report page 24
Direct Broadcast
Direct Broadcast (DB) is the direct transmission of spacecraft instrument data to the ground
Immediate access to data by the end user for real-time applications
Ideal for emergency decision support (fire, weather tracking…)
SMAP Applications in Real-Time
Summary
Increase efforts in determining frequencies that excite specific biomass and biological vegetation features, not only geophysical
With new applications that are possible with direct measurement of biomass, assess benefits of Direct broadcast
Recommended