AIG March 10, 2014 remote sensing conference
Philosophy & Photogeological Case
Histories
Nick Lockett &
Associates Pty Ltd
Orapa 2125 A/K1 pipe vegetation anomaly
Source: Botswana Government, Manfred Marx, Rough Diamond Review
W.A. lateritic weathering terrain: Generalised regolith & geochemical profiles
After Lithofire 2002
Relationship between land form & regolith in arid regions of the Yilgarn Craton
Modified after Anand 2002
Schematic geological setting of primary and secondary diamond deposits in the Kasai Craton,Angola and DRC.
Glacial Dispersion of Kimberlite Indicator Minerals
Schematic diagram of typical landforms associated with continental glaciation
Enlarged Portion of Northern Quebec Black & White Air Photo
Guelb er Richat Dome, Taoudeni Basin, Mauritania
Central African Project Area Landsat 7 + ETM Image
Erosional landform expression of surface & sub-surface geology
From Miller, 1961, “Photogeology”
SRTM DEM
90m cellsize (30m over USA,
Australia)
Derived from Shuttle Topographic
Radar Mapping Mission
Available from 50 deg North to 50 deg
South
Not edited (preliminary only)
Holes around water bodies and in
radar shadows
Noise in “flat areas”
Stereoscope
Photogeology mapping flow sheet
Surface geology map
Stage 1. Image interpretation
IMAGE INTERPRETATION BASE DATASET PRODUCT
i) Published geology, proprietary outcrop
and regolith mapping, drill hole regolith and bedrock geology
Bedrock geology and regolith framework
ii) Stereo imagery
Bedrock outcrops, fractures, foliation, selected litho
contacts, regolith/landform units (e.g. breakaways), drainage channels, dunes, culture
iii) Landsat 7 B,G,R=4/2, 4/7,5/7 Saprock, ferricrete, backslope ferricrete,
bedrock litho units, saprolite, sand cover,
sheetwash, alluvium
iv) K,U,Th, ternary radiometrics Ferricrete, backslope ferricrete, sand/alluvium,
granitoids
v) Aeromagnetics Pisolithic ferricrete, subsurface bedrock geology and structure
vi) Reconnaissance field check Ground truthing and map verification
Colour air photo 1:25,000
1 kilometre
channel
saprock
road
breakaway (unconformity)
Foliation trend
Pallid/mottled zone
ferricrete
bif
calcrete/hardpan
Landsat TM: B,G,R, as bands 2,4,7
1 kilometre
backslope
bedrock outcrop
ferricrete
channel Saprolite/ saprock
bif
backslope ferricrete
Ironstone ferruginous
and saprolite
fresh outcrop
haematite-maghemite 1 kilometre
channel
goethite
bif
ferruginous bedrock
Landsat TM: B,G,R, = 4/2,4/7,5/7
Thorium radiometrics: pseudocolour image
1 kilometre
channel
ferricrete
ferruginous bedrock
breakaway
backslope
Final Geology Interpretation
1 kilometre
DTM with geology drape
Botswana Published Geology
Botswana
Published
1:125,000
Geology
Published Geology
Surface Geology Interpretation
Geology Drape
Geology Perspective
Botswana Solid Geology and Magnetics 1vd
Merlin Area, Northern Territory, Regolith and Structure Mapping;
Enlarged Portion of 1:50,000 Colour Air Photo NTc Limmen Gate, Run 27, Frame 119, Acquired 14-9-1995
Air Photo Supplied by NT Dept Lands & Environment
Portion of Merged LANDSAT TM/SPOT Image Covering Merlin Project
Imagery Acquired & Processed by Geoimage Pty Ltd
Merlin Area Photogeological
Map
Produced from 1:10,000 Colour Air
Photos and Field Mapping
Evolution of Landscape
Showing Inversion of Topography on the Merlin Plateau
Portion of 1:50,000 Merlin Regional Photogeology
Pull-apart Basin Model & Riedel Shear Diagram
Conclusion
DEMS & satellite imagery available from a variety of
sources. (90m DEM globally available)
Resolution range 90m to 0.5m – It’s important to
pick the right resolution and scale for your project
Satellite imagery can be draped over DEM for
stereoscopic viewing and interpretation
Accurately georeferenced topographic &
photogeological interpretive maps can be produced
to order for anywhere in the world
Satellite imagery, DEMs and derived products ideal
for planning and compiling results of field
programs