Microwave RS Application and It_s Use in Vietnam
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Transcript of Microwave RS Application and It_s Use in Vietnam
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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Microwave remote sensing
applications and it’s use in
Vietnam
1. The applications of microwave RemoteSensing;
2. The Use of Microwave data in Vietnam
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR applications
SAR interferometry for DEM generation;
SAR interferometry for subsident monitoring;
SAR for soil moisture content; SAR for biomass estimation;
SAR for crop estimation;
SAR for flood control; SAR for oil spills monitoring.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR for DEM generation
Two technology can be applied to generate DEM(Stereo SAR and Interferometric SAR);
Stereo SAR uses the parallax of SAR pair to
generate DEM; Interferometric SAR uses the deferent phases of
two SAR images to estimate the surface height;
The arrived DEM accuracy is very from 10 ms to50 m;
A DEM for a large area can be generated without
need of ground control or a few control points.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR interferometry for subsidence
monitoring
DiInSAR technology is used;
The millimeters level of accuracy can be
obtained.
This technology is good for monitoring the
construction site such as mining area, city...
It can help in predicting the hazards such as
mining exploitation.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR application for soil moisture
content estimation
Soil dielectric constant is calculatedthrough the SAR backscattering signals;
The soil moisture content can beestimated by the soil dielectric constant;
The accuracy of the estimated resultdepend on the SAR wave length, the
polarization used;
It is useful for irrigation monitoring as wellas the environmental monitoring.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR for biomass estimation
Combine two separate SAR technologies, SARpolarimetry and Interferometry;
SAR polarimetry uses the polarization state of receiving and transmitting channel to measure the
differences in backscatter due to orientation, shapeand material composition;
SAR interferometry coherently combines signalsfrom two separated spatial positions to extract the
interferogram; By combining two technologies, the vegetation
propertied such as vegetation height and biomasscan be determined.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR for crop estimation
Multi-temporal SAR data should be used to
monitor the plant grow and estimate the plant’s
biomass. The damages area due to Flooding or Sea
Serge... can also be monitoring;
The crop producing model may be used tosimulate the plant grow and predict the crop
yields;
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR for flood control
SAR data is weather independent;
It can be obtain in before, during, and after the
flood event;
The flood area can be mapped;
The flood movement can be delineated;
The flood effect area can be mapped.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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SAR for oil spills monitoring
The SAR data is cloud independent;
Oil cover surface is clearly displaced in SAR
images as dark regions; Some software can detect oil spills
automatically’
The thickness of the oil layer may also beobtained using SAR data;
With the multi-temporal data available, thesource of pollution may be discovered.
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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The Use of SAR data in Vietnam
Up to now, SAR data has not widely used in
Vietnam despite its various applications;
Most of the SAR data is used for the research
purposed;
Some projects have used the SAR data
namely: Flood control in Mekong delta river;Rice yield prediction in the Mekong river
delta;
8/2/2019 Microwave RS Application and It_s Use in Vietnam
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Some reasons for the limit used of
SAR DATA in Vietnam
Lack of SAR data availability;
Microwave remote sensing was not taught in
the university;
SAR images is not easy to interpretation;
Lack of professional technician;
Lack of expert in this field of study;
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In the future
With the data receiving station, the ASAR datawill be available;
The availability of ASAR data will encouragesthe user;
Hopefully, JAXA can help to increase the usedof SAR data by providing Remote SensingCentre with technical supports or ALOS-
PALSAR data in some research activities;
Thanks you!!!