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POLINSAR ROUND TABLE - SEED QUESTIONS

 

Round Table: Studies on Polarimetry/Interferometry (1)

Round Table: Studies on Polarimetry/Interferometry (2)

Round Table: Land-Agriculture Applications

Round Table: Theoretical Modelling

Round Table: Forestry (Parallel Session)

Round Table: Sea Ice (Parallel Session)

Round Table: SAR Polarimetric Interferometry (Polinsar)

Round Table: Poster Session

Round Table: Other Applications Development

Round Table: Spaceborne Sar

Continued Round Table Sessions

Day 1, Tuesday 14 January

12:20-12:40

Round Table: Studies on Polarimetry/Interferometry (1)

Chair:

H. Skriver/D.Corr

Question 1

Can the user determine whether polarimetry will be of benefit for the application they are concerned with?

 

Question 2

If full polarimetry is not available to the user then:

 

What is the order of performance of partial polarimetry options?

Which polarisations are the most useful in a partial polarimetric system?

Does the Science User always need full polarimetry?

 

Question 3

How great is the benefit of the cross-polar channel? - this increases data volume and stretches system signal to noise requirements, is it worth it?

 

Do unsupervised classification techniques have practical application without an image interpreter to provide the class labels?

 

12:40-13:00

Round Table: Studies on Polarimetry/Interferometry (2)

Chair:

S.Cloude/J.C. Souyris

Question 1

Can bare surface roughness and moisture be reliably estimated using simple POLSAR ratios such as HH/VV or is full phase and coherence information from Quadpol required? Can POLInSAR help further improve estimates of bare surface parameters?

Question 2

Is there any prospect of developing robust methods for removing vegetation effects in surface parameter estimation?

 

Question 3

Do mixed base polarimetric sensors (eg. LR circular/HV or 45 degree/HV) offer any operational advantage over conventional channels? In particular, is polarimetric phase (coherence) important for classification and if so is there some mixed base switching arrangement that can access this information without the need for full S matrix measurements?

 

Question 4

What are the calibration requirements for mixed base POLSAR systems? Is it possible to obtain fully phase and amplitude calibrated data from a limited mixed base system?

 

Question 5

What are the relative strengths and weaknesses of space versus airborne sensors in POLINSAR applications, especially given that POLSAR requires orthogonal channel switching and InSAR single pass operation, both of which limit space deployment capabilities?

 

Question 6

What are the limitations of present POLSAR segmentation and classification techniques. Are they capable of exploiting all the polarimetric information in the data? Special attention to slope, helicity and anisotropy parameters which make up only a small fraction of the energy in the covariance matrix but are important physical parameters

Question 7

What are the limitations of the Wishart H/A/alpha approach to POLSAR classification? Can it be modified or extended to improve classification or is it fundamentally limited in its application?

 

 

Question 8

Can sub-aperture processing be used in POLINSAR to further improve segmentation/classification of natural? terrain

 

16:40-17:00

Round Table: Land-Agriculture Applications

Chair:

J. S. Lee/S. Quegan

Question 1

Besides crop classification, what can additional crop parameters (height, biomass, plant structure, etc.) be reliably extracted using POLSAR and POL-INSAR data?

Question 2

Does supervised classification perform better than unsupervised classification? What are their merits?

 

Question 3

Can multi-temporal polarimetric data collection aid in monitoring crop growth and development?

Question 4

What can ENVISAT ASAR with C-band dual polarizations achieve in land-agriculture applications?

Question 5

Are the airborne datasets on which most techniques have been tested sufficient guide to what is needed and will happen from

space (e.g. how significant are incidence angle effects)?

Question 6

Are available data adequate to test and compare classification algorithms?

 

18:20-18:40

Round Table: Theoretical Modelling

Chair:

Le Toan/P. Saich

Question 1

What are the reasons that limit the physical modelling works on natural media (soil, vegetation)? Difficulties to describe the natural media? Difficulties to describe all the scattering mechanisms? Lack of interest by physicists on natural media?

 

Question 2

Are the simplified models (e.g. homogeneous media and simple scattering mechanisms) sufficient ?

 

Question 3

How modelling can assess the use of partial polarimetry (e.g. ASAR) as compared to full polarimetry for different applications?

 

Question 4

Should more research be encouraged?

Question 5

How more research can be encouraged?

 

Day Two, Wednesday 15 January

10:20-10:40

Round Table: Forestry (Parallel Session)

Chair:

D. Hoekman/T.Mette

Question 1

Which are the promising approaches for forest biomass estimation and

which are the limitations?

Question 2

How does relief influence the polarimetric signature of forests?

Question 3

What are the main information needs related to (weather independent)

radar monitoring techniques?

Question 4

What are robust methods for complex targets such as heterogeneous,

hilly and textured natural forests?

10:20-10:40

Round Table: Sea Ice (Parallel Session)

Chair:

W Dierking/M Drinkwater

Question 1

What are the applications of sea ice polarimetry (science and operations)?

Question 2

What applications of sea ice polarimetry are viable based on anticipated

sampling capabilities associated with polarimetric modes?

Question 3

For classification of sea ice, what accuracies are we hoping to achieve and what ice types are important to classify - are we in a position to make a generic statement about these goals?

Question 4

What are the primary limitations of the existing work on

polarimetric classification of sea ice?

Question 5

Which polarimetric parameters or frequencies which govern our ability to classify sea ice?

Question 6

In what way do the future choices of satellite frequencies

and channels limit our current capability?

Question 7

What incremental improvement shall we expect wrt Envisat alternating polarisation mode? Where are the primary benefits at C-band?

Question 8

What are the recommended actions for future work?

 

 

12:20-12:40

Round Table: SAR Polarimetric Interferometry (Polinsar)

Chair:

E.Pottier/K Papathanassiou

Question 1

 

 

Question 2

 

 

Question 3

 

 

Question 4

 

 

18:30-18:50

Round Table: Poster Session

Chair:

P. Lombardo/S. Quegan

Question 1

What extra information does polarisation and/or polarimetric interferometry bring to your application, and is polarimetry necessary? What do you lose if you just have multi-polarisation?

Question 2

What techniques are needed to best extract and exploit this information?

Question 3

Have the techniques been widely validated, and is software available to carry out these techniques?

Question 4

Are the airborne datasets on which most techniques have been tested sufficient guide to what is needed and will happen from space (e.g. how significant are incidence angle effects)?

Summary

What does polarimetry and/or polarimetric inteferometry contribute to your application? How do we actually use it? Has it been adequately tested? Do the existing data allow generalisation to other scene or sensor conditions?

 

16:30-18:50

Continued Round Table Sessions (day 2)

16:30

Polarimetry-Interferometry Studies

H. Skriver/D.Corr/ S.Cloude/J.C. Souyris

16:50

Land-Agriculture Classification

J. S. Lee/S. Quegan

17:10

Theoretical Modelling

Le Toan/P. Saich

17:30

Forestry

D. Hoekman/T.Mette

17:50

Sea Ice

W Dierking/M Drinkwater

18:10

SAR Polarimetric Interferometry (Polinsar)

 E.Pottier/K Papathanassiou

18:30

Poster session

P. Lombardo/S. Quegan

 

 

Day Three, Thursday 16 January

 

 

10:20-10:40

Round Table: Other Applications Development

Chairman:
K Czuchlewski./ W. Kuehbauch.

Question 1

When will be the first operational multiband, multipolarisation satellite SAR system available.

Question 2

What shall be the minimum time lack achievable between data-take and data-delivering - it still takes to much time, for instance, foragricultural applications between data-take and data-availability.

Question 3

How will the SAR satellites compete with optical remote sensing systems on satellites with daily repition rates.

 

Question 4

How will the infrastructure be organized, for instance, to deliver biomass data of agricultural crops to farmer in that kind of preparation and transfer, so that these data can be used in the farming practices, for

instance, in the form of maps and the WGS-format.

 

Question 5

For broad application of SAR informations in agronomy the data will have to be available continuously and in a very short period of time in a form that is both standardized, ready to be applied in the field and affordable. How will air-born SAR-Systems meet these requirements?

 

12:20-12:40

Round Table: Spaceborne Sar

Chairman:

A.Moreira Y-L.Desnos

Question 1

Future, planed SAR missions will allow repeat-pass Pol-InSAR imaging (e.g. ALOS, TerraSAR-L). Which limitations are posed comparing to a dedicated single-pass Pol-InSAR mission? Which advantages are achieved with a dedicated single-pass dual-baseline Pol-InSAR mission?

Question 2

There are two trends for future SAR intruments: 1) large complex SAR systems versus 2) small, application focused SAR missions. What would be an optimum configuration for a dedicated Pol-InSAR spaceborne system?

 

Question 3

There is a need to co-ordinate future SAR missions being developed by several space agencies. At the end of this decade there will be more probably than 10 SAR systems operating in space, most of them being polarimetric. How to coordinate the individual systems towards a vision of a

"sensor web"?

 

 

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