Property scale exploration targeting with WorldView-3

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PhotoSat offers a geological alteration mapping package produced using WorldView-3 high resolution satellite photos, with about 16 times the resolution of ASTER alteration mapping. In areas of sparse vegetation, 16 band WorldView-3 photos are used to map hydrous silica, clay, ferric and hydrous ferric iron oxide, micas, ammonium feldspar, carbonate and propylitic minerals for epithermal gold and silver and porphyry copper exploration.

WorldView-3 ALTERATION mineral mapping

Depending on the presence of the alteration minerals on photo visible outcrops and subcrops the PhotoSat WorldView-3 alteration mineral mapping will include the minerals listed below.  If the mineral is not present it will not be included in the maps and report.

Opal/Chalcedony    SiO2•n(H2O)

Calcite             CaCO3

Chlorite/Epidote PhotoSat cannot differentiate between chlorite and epidote minerals with 16 band WorldView-3 photos.

Clay minerals

Alunite                    (Na,K)Al3(SO4)2(OH)6

Kaolinite                  Al2Si2O5(OH)4

Montmorillonite     (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O

Micas

Sericite: Sericite is hydrothermal alteration of orthoclase or plagioclase feldspars.  It may consist of each or a combination of the mica minerals Muscovite, Illite, and Paragonite.

PhotoSat cannot differentiate between these micas with 16 band WorldView-3 photos.

Muscovite   (KF)2(Al2O3)3(SiO2)6(H2O)

Paragonite  NaAl2[(OH)2|AlSi3O10]

Illite          K0.6(H3O)0.4Al1.3Mg0.3Fe2+0.1Si3.5O10(OH)2·(H2O)

Ammonium Minerals

Ammonium Illite    very good match to NH4 Illite spectra

Weak Ammonium Illite equally good match to the spectra of a mixture of Illite and Montmorillonite.

Buddingtonite (ammonium feldspar)  NH4AlSi3O8

Iron Oxides

Hematite            Fe3+2O3

Goethite             Fe3+O(OH)

Jarosite              KFe3+3(SO4)2(OH)6

Iron Oxide Gossans    FeO

Context images

2 m Geology enhanced colour image

2 m Vegetation intensity

50 cm Greyscale image

50 cm Natural colour image

Deliverables:  All alteration minerals as RGB Geotiff files blue=possible, red=probable.

Shapefile polygons of probable areas for all alteration minerals

WV3 alteration mapping report

ADVANCED PRODUCTS:

Spectral matching: Spectral matching uses the spectral signature of a pixel to look for other similar pixels. If there is an outcrop of significant interest, we can analyze the spectral signature of a pixel related to that outcrop and search for other pixels in the WorldView-3 scene that are similar.

WorldView-3 alteration package pricing

The geological alteration mapping is provided on a project-by-project basis and priced by the square kilometer. Please provide us with the extents of your project area and we will prepare a quote.

For more information contact us at info@photosat.ca or 1-604-681-9770.

PhotoSat WorldView-3 Alteration Deliverables

Up to 14 orthorectified context images:

  • Opal/Chalcedony
  • Calcite
  • Chlorite/Epidote
  • Alunite
  • Kaolinite
  • Montmorillonite
  • Sericite
  • Buddingtonite
  • Ammonium Illite
  • Weak Ammonium Illite
  • Hematite
  • Goethite
  • Jarosite
  • Iron Oxide Gossans

4 Context images:

  • 2 m Geology enhanced colour image
  • 2 m Vegetation intensity
  • 50 cm Greyscale image
  • 50 cm Natural colour image

Up to 14 ESRI Shapefiles (polygon)

  • Opal/Chalcedony
  • Calcite
  • Chlorite/Epidote
  • Alunite
  • Kaolinite
  • Montmorillonite
  • Sericite
  • Buddingtonite
  • Ammonium Illite
  • Weak Ammonium Illite
  • Hematite
  • Goethite
  • Jarosite
  • Iron Oxide Gossans

PhotoSat WorldView-3 Alteration Technical Specifications

Scene Dimensions: Minimum 50 km2
Map Projection: UTM, Others on request
Datum: WGS84, NAD27, NAD83 – Others on request
Raster Format: Alteration and Colour Images: GeoTIFF
Vector Format: Alteration minerals: ESRI Shapefiles (polygon)
Pixel Size: Colour=50 cm, alteration 2 m resampled from 7.5 m
Media: FTP
Image Resolution Pixel Size
Greyscale image

Natural colour image

50 cm 50 cm
Geology enhanced colour image

Iron oxide gossans

Vegetation intensity

2 m 2 m
Opal/Chalcedony

Calcite

Chlorite/Epidote

Alunite

Kaolinite

Montmorillonite

Sericite

Buddingtonite

Ammonium Illite

Weak Ammonium Illite

Hematite

Goethite

Jarosite

7.5 m 2 m

License Agreement

  • DigitalGlobe Internal Use License
  • PhotoSat General Terms of Sale