Microwave remote sensing Microwave remote sensing applications and it’s use in applications and it’s use in

VietnamVietnam

1.1. The applications of microwave Remote The applications of microwave Remote Sensing;Sensing;

2.2. The Use of Microwave data in VietnamThe Use of Microwave data in Vietnam

SAR applicationsSAR applications

SAR interferometry for DEM generation;SAR interferometry for DEM generation; SAR interferometry for subsident monitoring;SAR interferometry for subsident monitoring; SAR for soil moisture content;SAR for soil moisture content; SAR for biomass estimation;SAR for biomass estimation; SAR for crop estimation;SAR for crop estimation; SAR for flood control;SAR for flood control; SAR for oil spills monitoring.SAR for oil spills monitoring.

SAR for DEM generationSAR for DEM generation Two technology can be applied to generate DEM Two technology can be applied to generate DEM

(Stereo SAR and Interferometric SAR);(Stereo SAR and Interferometric SAR); Stereo SAR uses the parallax of SAR pair to Stereo SAR uses the parallax of SAR pair to

generate DEM;generate DEM; Interferometric SAR uses the deferent phases of Interferometric SAR uses the deferent phases of

two SAR images to estimate the surface height;two SAR images to estimate the surface height; The arrived DEM accuracy is very from 10 ms to The arrived DEM accuracy is very from 10 ms to

50 m; 50 m; A DEM for a large area can be generated without A DEM for a large area can be generated without

need of ground control or a few control points.need of ground control or a few control points.

SAR interferometry for subsidence SAR interferometry for subsidence monitoringmonitoring

DiInSAR technology is used;DiInSAR technology is used; The millimeters level of accuracy can be The millimeters level of accuracy can be

obtained.obtained. This technology is good for monitoring the This technology is good for monitoring the

construction site such as mining area, city... construction site such as mining area, city... It can help in predicting the hazards such as It can help in predicting the hazards such as

mining exploitation. mining exploitation.

SAR application for soil moisture SAR application for soil moisture content estimationcontent estimation

Soil dielectric constant is calculated Soil dielectric constant is calculated through the SAR backscattering signals;through the SAR backscattering signals;

The soil moisture content can be The soil moisture content can be estimated by the soil dielectric constant;estimated by the soil dielectric constant;

The accuracy of the estimated result The accuracy of the estimated result depend on the SAR wave length, the depend on the SAR wave length, the polarization used;polarization used;

It is useful for irrigation monitoring as well It is useful for irrigation monitoring as well as the environmental monitoring.as the environmental monitoring.

SAR for biomass estimationSAR for biomass estimation

Combine two separate SAR technologies, SAR Combine two separate SAR technologies, SAR polarimetry and Interferometry;polarimetry and Interferometry;

SAR polarimetry uses the polarization state of SAR polarimetry uses the polarization state of receiving and transmitting channel to measure the receiving and transmitting channel to measure the differences in backscatter due to orientation, shape differences in backscatter due to orientation, shape and material composition;and material composition;

SAR interferometry coherently combines signals SAR interferometry coherently combines signals from two separated spatial positions to extract the from two separated spatial positions to extract the interferogram; interferogram;

By combining two technologies, the vegetation By combining two technologies, the vegetation propertied such as vegetation height and biomass propertied such as vegetation height and biomass can be determined.can be determined.

SAR for crop estimationSAR for crop estimation

Multi-temporal SAR data should be used to Multi-temporal SAR data should be used to monitor the plant grow and estimate the monitor the plant grow and estimate the plant’s biomass.plant’s biomass.

The damages area due to The damages area due to Flooding or Sea Flooding or Sea Serge...Serge... can also be monitoring;

The crop producing model may be used to The crop producing model may be used to simulate the plant grow and predict the crop simulate the plant grow and predict the crop yields;yields;

SAR for flood controlSAR for flood control

SAR data is weather independent;SAR data is weather independent; It can be obtain in before, during, and after the It can be obtain in before, during, and after the

flood event;flood event; The flood area can be mapped;The flood area can be mapped; The flood movement can be delineated;The flood movement can be delineated; The flood effect area can be mapped.The flood effect area can be mapped.

SAR for oil spills monitoringSAR for oil spills monitoring

The SAR data is cloud independent;The SAR data is cloud independent; Oil cover surface is clearly displaced in SAR Oil cover surface is clearly displaced in SAR

images as dark regions;images as dark regions; Some software can detect oil spills Some software can detect oil spills

automatically’ automatically’ The thickness of the oil layer may also be The thickness of the oil layer may also be

obtained using SAR data;obtained using SAR data; With the multi-temporal data available, the With the multi-temporal data available, the

source of pollution may be discovered.source of pollution may be discovered.

The Use of SAR data in VietnamThe Use of SAR data in Vietnam

Up to now, SAR data has not widely used in Up to now, SAR data has not widely used in Vietnam despite its various applications;Vietnam despite its various applications;

Most of the SAR data is used for the research Most of the SAR data is used for the research purposed;purposed;

Some projects have used the SAR data Some projects have used the SAR data namely: Flood control in Mekong delta river; namely: Flood control in Mekong delta river; Rice yield prediction in the Mekong river Rice yield prediction in the Mekong river delta;delta;

Some reasons for the limit used of Some reasons for the limit used of SAR DATA in VietnamSAR DATA in Vietnam

Lack of SAR data availability;Lack of SAR data availability; Microwave remote sensing was not taught in Microwave remote sensing was not taught in

the university;the university; SAR images is not easy to interpretation;SAR images is not easy to interpretation; Lack of professional technician;Lack of professional technician; Lack of expert in this field of study;Lack of expert in this field of study;

In the futureIn the future

With the data receiving station, the ASAR data With the data receiving station, the ASAR data will be available;will be available;

The availability of ASAR data will encourages The availability of ASAR data will encourages the user;the user;

Hopefully, JAXA can help to increase the used Hopefully, JAXA can help to increase the used of SAR data by providing Remote Sensing of SAR data by providing Remote Sensing Centre with technical supports or ALOS-Centre with technical supports or ALOS-PALSAR data in some research activities;PALSAR data in some research activities;

Thanks you!!!Thanks you!!!