multiscale geological mapping using multispectral data the...

Multiscale geological mapping using multispectral datathe Jabali (Yemen) case study

Jean-Paul DEROIN1, Ismail AL GANAD2, Paul BENOIT3, Florian TEREYGEOL4, and Jürgen HECKES5

1Université de Reims, EA 3795, Reims, France2Geological Survey and Mineral Resources Board, Sana’a, Yemen

3Université Paris 1 – UMR 8589 LAMOP, Paris, France4UMR 5060 IRAMAT, CEA, Saclay, France

5Deutsches Bergbau-Museum, Bochum, Germany

Rhodes, GreeceWednesday 5 November 2008Geomorphology and Geology

ADEN AO 3643 GEMS Project – Geological Mapping of Sensitive Environments in Yemen, Lebanon, Tunisia, and France

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Sun - Helios

Satellite measuringthe Reflectance

Nearinfrared

Visible

Visible

The Island of Rhodes is namedafter the nymph Rodos (Rόdoς) who,accordingly to the Greek mythology,

was one of the loversof the sun god Helios…

In Optical Remote Sensing…

Multiscale geological mapping using multispectral data : the Jabali (Yemen) case study


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Yemen, the Red Sea,and Africa

Meris data acquired on 28 April 2008

RGB = b12 b5 b2

©ESA 2008

Rub Al Khali

Volcanictrapps

Wadi Jawf


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FRANCE• Université de Reims

- EA 3795, GEGENAA• CEA Saclay, UMR 9956• Institut de Recherche sur les

Archéomatériaux, Belfort, UMR 5060• Université Paris 1-Sorbonne-CNRS, Paris

- Laboratoire de Médiévistique occidentale de Paris, LAMOP, UMR 8589

- Orient et Méditerranée, UMR 8167• Université Pierre et Marie Curie-CNRS,

Paris, SISYPHE, UMR 7619

FEDERAL REPUBLIC OF GERMANY• Deutsches Bergbau-Museum, Bochum

REPUBLIC OF YEMEN• Yemen Geological Survey and Mineral

Resources Board, Sana’a• ZincOx Resources plc, Hadda, Sana’a

Ancient Silver Mine at Jabali, Yemen, a narrow gallery

The Jabali Project (2005-2009)



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Example of mineralization: Smithsonite - ZnCO3

Hydrozincite - Zn5[(OH)3|CO3]2observed in the ancient underground mining works

1 0 c mADEN AO 3643 GEMS Project – Geological Mapping of Sensitive Environments in Yemen, Lebanon, Tunisia, and France


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Ancient Silver Mine at Jabali, Yemen, general settingQuickBird data drapped over a Spot5-DEM

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From the South to the North


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From the North to the South


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Image data

ALOS PSR POL and AVNIR-2

Landsat TM, ETM+, and MSS

ASTER

SPOT-5 P, SPOT-1 P

QuickBird

DEMs

SRTM

SPOT-5

topographic map

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Variety of surface roughness



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HH

HV

VH

VV



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DEROIN J.-P., AL-GANAD I. & AL-THARI M. (2008). The importance of SAR frequency, polarization, and incident angle for mapping arid regions, the Jabali test site, Yemen, ALOS ADEN AO 3643. Proceedings of the First ALOS PI Symposium, 4p.

1st ALOS PI Symposium, Kyoto, November 2007


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Important. The SWIR-range (Landsat TM, ETM+, or ASTER) is very important for lithological mapping

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ALOS spectral bands

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Colour composite : Red = b4Green = b2Blue = b1

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AVNIR-2

vs

Landsat TM

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AVNIR-2

vs

QuickBird

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Geological interpretation of the QuickBird data Image acquired on March 30, 2002Size of the area: 4 km from E to W, 6 km from N to S

Multiscale geological mapping using multispectraldata :

the Jabali (Yemen) case study


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Landsat TM30 m1987 02 04201 x 268 pixels

QuickBird pansharp.0.67 m2002 03 309000 x 12000 pixels

ALOS AVNIR-210 m2006 10 18603 x 804 pixels


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ALOS LANDSAT QUICKBIRDALOS 1.00 0.59 0.76LANDSAT 1.00 0.74QUICKBIRD 1.00

Infrared range (4)

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Red range (3)

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Green range (2)

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Blue range (1)

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(1) Higher the wavelength, higher the correlation

(2) ALOS is systematically better correlated with QuickBird than with LANDSAT,in spite of similar spectral ranges for these latter

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(3) Correlation is very low in relief areasSun elevation is different, 26° for LANDSAT, 37° for QuickBird, and 45° for ALOS

(4) For flat areas (carbonates), correlation is better for dolomite than for limestoneImportance of the contact metamorphic zone (cooked carbonates). Investigation is in progress.

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QuickBirdR = band 4, G = band 2, B = band 1

QuickBird/ALOS Avnir-2R = band 4 (QB), G = band 2 (QB), B = band 1 (Avnir)

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Specific interest

of the red range

for iron caps

Mapping

630-690 nm should bebetter than 610-690 nm

Avnir-24 3 2


Landsat TM QuickBird pansharp.ALOS AVNIR-2

C o n c l u s i o n s

ALOS AVNIR-2 Data represent a good tradeoff for regional mapping

LANDSAT MSS (80 m) 1: 250 000LANDSAT TM/ETM+ (30 m) 1: 100 000ALOS AVNIR-2 (10m) 1: 50 000 (ASTER + SWIR)SPOT 5 (2.5/5 m) 1: 25 000 (IRS, future ALOS?)QUICKBIRD-IKONOS (≤ 1 m) 1: 10 000

They could be merged with higher resolution data (specific blue range)


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Acknowledgements :

The field missions have been facilitated by

The Yemen Geological Survey and Mineral Board, Mr Brett GRIST, ZincOX, Sana’a Office, Major Khaled Al Naphani and the National Guard of Yemen

Data have been provided

The ALOS and MERIS by European Space Agency and Japan Aerospace Exploration AgencyThe QuickBird data by Deutsches Bergbau MuseumThe Landsat data by U.S.G.S.

The French Ministry for Foreign Affairs for financing the Project

The ALOS Project “Geological Mapping of Sensitive Environment”(P.I. J.P.DEROIN) is conducted under the agreement of ALOS ADEN AO 3643.


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Thank you for your attention!


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