2007/12:

Reprocessing of POLDER atmospheric products.

A reprocessing of the entire POLDER archive was completed to produce all atmospheric products (Aerosols and Clouds) with the latest generation of science algorithms used to process the PARASOL data.

2007/12:

Transfer of POLDER atmospheric product distribution to ICARE.

The ICARE Data and Services Center located at the University of Lille took over the processing, archive, and distribution of POLDER atmospheric products, in line with the PARASOL mission.

Therefore, from now on, POLDER atmospheric products may be downloaded from the ICARE website at: http://www.icare.univ-lille1.fr/

2006/09:

BRDF database from POLDER 2 is available

A BRDF database from POLDER-2 multi-directional measurements is available, and can be downloaded through the POSTEL web site.

2006/04:

Presentation about the POLDER mission results

2005/11:

Reprocessing over Ocean

POLDER-1 and POLDER-2 data over OCEAN have been reprocessed with several significative improvments:
For aerosols retrieval over ocean, the spatial coverage has been extended by using several means (addition of cases with very few directions and intense aerosol plumes, relaxing of glitter tests...), leading to rather significant changes on monthly syntheses.

Comparison between the two aerosols processing version
Old version

New version

For ocean colour, marine parameters have been slightly modified.

A very good agreement with in-situ measurements has been obtained in both cases, this is presented in the POLDER scientific products rubric.

A consistent set of POLDER products is now available for a total period of 15 months:
8 for POLDER 1 from October 1996 to June 1997
7 for POLDER 2 from April to October 2003
The final scientific POLDER products can be ordered or downloaded from the POLDER website/order desk at: http://polder.cnes.fr

2005/11:

Additional products for Land Surfaces

Additional products have been generated by MEDIAS/POSTEL and can be downloaded:

POLDER 1 BRDF database including atmospheric correction
fapar and albedo parameters

2005/11:

Latest Publications about POLDER

Here is a short list of main POLDER results published recently:

Herman M., Deuzé J.L., Marchand A., Roger B., Lallart P., 2005:
Aerosol remote sensing from POLDER/ADEOS over the ocean: Improved retrieval using a nonspherical particle model.
Journal of Geophysical Research, Vol 110, N° D10S02

Quaas J., Boucher O., 2005:
Constraining the first aerosol indirect radiative forcing in the LMDZ GCM using POLDER and MODIS satellite data.
Geophys. Res. Lett., 32, L17814

Buriez, J.-C., F. Parol, C. Cornet, M. Doutriaux-Boucher, 2005:
An improved derivation of the top-of-atmosphere albedo from POLDER/ADEOS-2: Narrow band albedos.
J. Geophys. Res., Vol. 110, No. D5, D05202, 04 March 2005

Bréon F.M., Doutriaux-Boucher M., 2005:
A comparison of cloud droplet radii measured from space.
IEEE Trans Geosc. Rem. Sens., 43, 1796-1805

Knap W.H., C-Labonnote L., Brogniez G., Stammes P., 2005:
Modeling total and polarized reflectances of ice clouds: evaluation by means of POLDER and ATSR-2 measurements.
Appl. Optics., 44, 4060-4073

Bacour, C. and F.M. Bréon, 2005:
Variability of land Surface BRDFs.
Remote Sensing Environment. 98, 80-95.

2005/05:

End of POLDER 1 scientific reprocessing

2005/01:

Final reprocessing of POLDER 2 data

The reprocessing of POLDER 2 data was achieved at the end of 2004. This version of the processing accounts for the recommandations of the validation review, held in June 2004. The final scientific POLDER 2 products are now available on the POLDER website/order desk at: http://polder.cnes.fr

You can directly vizualize or download HDF data files using the "on-line products" menubar. Take a look at the animations of POLDER level 3 maps of the main geophysical parameters for aerosols, clouds, ocean color and land. An ordering interface is also available to receive the complete products (first, register in order to get a password)

The second generation of algorithms provides significant improvements with regard to the previous products. We have a lot more insitu data than we had during POLDER-1 life and also other major coincident satellite measurement to compare with, particularly MODIS, SeaWifs, MSG, MERIS. All these comparisons show the benefit of using the directional and polarized signatures of the Earth reflectances to complement the spectral signatures.

The POLDER-I dataset will now be re-processed with the new algorithms. Thus a consistant set of POLDER products will soon be available for a total period of 15 (8+7) months.

2004/08:

Start of POLDER 2 data distribution

POLDER 2 on ADEOS 2 has been operating under nominal conditions from April 2nd, 2003 to October 24th, 2003, so that around 7 complete months of POLDER 2 measurements will be distributed to the international scientific community. Final level 1 archive is now available, as well as a set of preliminary level 2 and 3 products (first scientific results are presented in the "scientific products" rubric).

The present dataset corresponds to the "validation review" products. A final reprocessing is scheduled for October. The POLDER-I dataset will be reprocessed as well.

The "POLDER User Services" rubric provides access to the POLDER data distribution center. Level 1 data can be ordered by all non-commercial users. Non-validated Level 2 and Level 3 products can only be ordered by POLDER 2 Principal Investigators but a preliminary set of main geophysical parameters can be directly vizualized and downloaded on-line in HDF format. Take a look at the animations of POLDER level 3 maps of the main geophysical parameters for aerosols, clouds, ocean color and land.

2004/07:

POLDER 2 Scientific Validation Review

We held our validation review on June 29-30. The second generation of algorithms provides significant improvements with regard to the previous products.
We have a lot more insitu data than we had during POLDER-1 life and also other major coincident satellite measurement to compare with, particularly MODIS, SeaWifs, MSG, MERIS. All these comparisons show the benefit and complementarity of the multi-directional+polarized approach with respect to the spectral approach.

The record of all presentations can be downloaded (sorry, it's in french).