“The Effectiveness of Remote Sensing Techniques in Lineament Mapping for Groundwater Exploration in Volcanic Terrains” • Hard-rock aquifers are only productive where there is secondary porosity – Productivity is directly related to the density and distribution of fractures – Haphazard well siting is often unsuccessful • Research Objectives: – Develop a comprehensive, standardized approach for using lineament analysis techniques to characterize fractured bedrock aquifers in Pacific Latin America • Test various digital image processing techniques – Evaluate the approach via simple pump tests and field assessments of lineaments
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The Effectiveness of Remote Sensing Techniques in Lineament Mapping for Groundwater Exploration in Volcanic Terrains Hard-rock aquifers are only productive.
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“The Effectiveness of Remote Sensing Techniques in Lineament Mapping for
Groundwater Exploration in Volcanic Terrains”
• Hard-rock aquifers are only productive where there is secondary porosity– Productivity is directly related to the density and distribution of
fractures– Haphazard well siting is often unsuccessful
• Research Objectives:– Develop a comprehensive, standardized approach for using
lineament analysis techniques to characterize fractured bedrock aquifers in Pacific Latin America
• Test various digital image processing techniques– Evaluate the approach via simple pump tests and field
assessments of lineaments
MethodsData sets:
• Satellite Imagery:– Digital Globe
QuickBird (1)• Optical• 0.60 m pixel size
– ASTER (1)• Optical• 15 m pixel size
– RADARSAT-1 (3)• Optical• 0.60 m pixel size
• 20 m DEM (digitized from topographic map)
• Geological Map
(1:50,000 scale)
Study AreaBoaco, Nicaragua
• Terrain – rugged, hilly, vegetated, lots of agricultural influence, several intermittent
streams
• Geology
– Tertiary volcanics, some Quaternary alluvium, normal faulting (two dominate directions)
Satellite Imagery Comparison
Adapted from: RADARSAT International 1996. Radarsat Geology Handbook. Richmond, B.C.
Optical: Radar:
Landsat
ASTER
RADARSAT
Satellite Imagery Comparison(continued)
• Digital Globe QuickBird and ASTER– Advantages:
• Multiple bands and high spatial resolution– Disadvantages:
• Limited by cloud cover and price
• RADARSAT-1– Advantages:
• Uninhibited by atmospheric conditions and time of day• Ability to penetrate vegetation
– Disadvantages:• Single bands and complex processing
RADARSATOrthorectified Scenes and Stack
February 24, 2007Dry SeasonAscending Orbit
September 9, 2006Wet SeasonAscending Orbit
November 7, 1997Transitional SeasonDescending Orbit