Satellite ASTER Global Geoscience Maps
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1 Satellite ASTER Global Geoscience Maps Michael Abrams Jet Propulsion Laboratory, California Institute of Technology, Pasadena USA (c) 2017 California Institute of Technology. Government sponsorship acknowledged. Michael Abrams, Jet Propulsion Laboratory/California Institute of Technology 2017 IGARSS July, 2017
2 Global Maps Global Geology Global Soils Global DEM
3 Global Maps Land use/land cover GLOBAL SURFACE COMPOSITION MAP???
4 GEO Community Activity Earth Observations for Managing Mineral and Non-renewable Energy Resources (CA-06) Global mineral map of the Earth s surface Australia Geoscience mineral map Global spectral libraries of soils in view of future IS spaceborne missions Global GEO community portals EO-based integrated products for monitoring environmental and societal impacts: National to regional (e.g. illegal mining, GFOI, GMOS) Local : mine site, SLO...
5 What is ASTER? ASTER Instrument 1999 launch on Terra Joint Japan/US effort 15 m vnir, 30 m swir, 90 m tir 60 km swath < 16 day repeat cycle MODIS ASTER (TIR) ASTER (SWIR) ASTER (VNIR) MISR MOPITT CERES > 3 million scenes in archive
6 Australia ASTER Geoscience Maps Released in 2014 False Color IR Landsat TM regolith ratios Green vegetation Ferric oxide content Ferric oxide composition Ferrous iron index Opaque index AlOH group content AlOH group composition Kaolin group index FeOH group content MgOH group content MgOH group composition Ferrous iron in MgOH/Carbonate Silica index Quartz index Gypsum index VNIR VNIR + SWIR SWIR TIR
7 Algorithms used to produce Australia ASTER Geoscience Maps
8 False Colour Infrared Australian ASTER mosaic comprises 3500 ASTER scenes spanning a 10 year period. Mosaic was cross-calibrated (reduced to reflectance) using Hyperion satellite hyperspectral imagery.
9 AlOH Group Composition e.g. Al-Clays: phengite, muscovite, paragonite, lepidolite, illite, brammalite, montmorillonite, kaolinite, dickite, beidellite Al-rich muscovite/illite kaolinite paragonite beidellite Al-poor muscovite/illite (phengite) montmorillonite White mica chemical gradients (exploration) Transported versus in situ regolith materials. Productive agricultural soils. Surface permeability (water catchments). ph indicator.
10 Desertification Index Soil loss through wind erosion From: Satellite-derived mineral mapping and low high monitoring of weathering, deposition and erosion, Cudahy et al., Nature, 2016.
11 Non-renewable resource exploration Halls Creek Mobile Zone, WA Distal Footprints phyllic zone argillic zone oxidised zone published 250K geology ASTER AlOH Group composition Au Cu 5 km
12 First Announced Gold Discovery Using ASTER Australia Geoscience Maps Kentor Gold Ltd. announced in 2014 the Chukbo deposit in Northern Territory, Australia, based on coincident phyllic and propyllitic alteration. Several new targets were also identified
13 From ASTER Geoscience Maps of Australia To ASTER Global Geoscience Maps
14 Data Processing at JPL Hulley (JPL) created Global Emissivity Database from all ASTER data acquired Data were pre-processed to create: cloud mask and vegetation mask. All 14 ASTER bands, for 1.3 million scenes, are stored locally, with associated masks. The data are resampled to 100m for all bands. Australian-developed Geoscience algorithms will be applied to this data set. Processing will be done on work stations or JPL cloud computing facility. First continent to be completed will be Australia. The continental product will be compared to Australian Geoscience maps, and adjustments made to leverage off of CSIRO s validation with Hyperion data and thousands of field chemical/mineralogical measurements. The other continents will follow, and be released as completed.
15 Sample ASTER Global Geoscience Product Silica index for 1 x 1 degree tile in Southern California Created from TIR band ratios red = high, blue = low
16 Australia ASTER Geoscience Map: Silica Index Proportional to SiO 2 content but also effected by particle size. Regolith mapping. low high
17 ASTER Global Geoscience Map: Silica Index Proportional to SiO 2 content but also effected by particle size. Regolith mapping. low high
18 NASA MEaSUREs RFP Requested proposals to create (or extend) Earth System Data Records, for example, Sea Surface Temperature May 2017, Abrams submitted proposal to NASA to produce ASTER Global Geoscience Products Funding decision expected ~September, project start December 1 Geoscience Maps produced continent-by-continent All maps will be available through NASA Land Processes DAAC starting end 2018
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