ERS-1 Filters

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2 total messages Started by J Naunheimer Thu, 23 Jul 1992 20:11

#164

Author: J Naunheimer
Date: Thu, 23 Jul 1992 20:11

18 lines
1029 bytes

We have recently received some ERS-1 data from the 35-day Multi-disciplinary
Phase.  The data were processed to 4 looks in slant range, at a pixel dimension
of 35 by 30 metres.

We are interested in filtering the data for display purposes, and we were
wondering if any other research groups have investigated filter types and 
sizes which maintain radiometric and geometric quality, but effectively 
reduce speckle.

If anyone has any information or success stories with using filtering
algorithms on ERS-1 data, my collegues and I would appreciate you sharing
them.

Thanks in advance!
-- 
John Naunheimer
naunheimer@ccrs.emr.ca

Re: ERS-1 Filters

#211

Author: Vu Tien
Date: Tue, 28 Jul 1992 09:02

33 lines
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In article <1992Jul23.201102.7331@emr1.emr.ca>, naunheim@ccrs.emr.ca (J Naunheimer) writes:
|> 
|> We have recently received some ERS-1 data from the 35-day Multi-disciplinary
|> Phase.  The data were processed to 4 looks in slant range, at a pixel dimension
|> of 35 by 30 metres.
|> 
|> We are interested in filtering the data for display purposes, and we were
|> wondering if any other research groups have investigated filter types and 
|> sizes which maintain radiometric and geometric quality, but effectively 
|> reduce speckle.
|> 
|> If anyone has any information or success stories with using filtering
|> algorithms on ERS-1 data, my collegues and I would appreciate you sharing
|> them.
|> 

Speckle reduction in ERS-1 images (and SAR images) are performed by using a low pass
filter of any kind, which means :
  a) using multi-looks images (summing independant pixels)
  b) performing low pass filtering (loosing resolution)
  c) using a MAP filter (Maximum A Priori Probablility) developed by the CESR team
     Touzi, Lopes, Nezri, et al. (cf IGARSS proceedings, 1990-91-92)

     they can be reached by snail mail at
     CESR, avenue du colonel Roche
     31055 Toulouse Cedex, France.

     There is also a paper in the ESA free bulletin Earth Remote Sensing of July 92
     (or is it August ?)
--
vutien@cenatls.cena.dgac.fr
vutien@capsogeti.fr

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