Using multi-beam RADARSAT-1 imagery to augment mapping surficial geology in northwest Alberta, Canada

This paper evaluates the applicability of multi-beam RADARSAT-1 satellite imagery for mapping surficial sediments in northwest Alberta, Canada, using simple arithmetic algorithms. The goal is to make the RADARSAT-1 imagery acquired by the Alberta Geological Survey (AGS) usable to common users who have no access to complex image classification software and (or) expertise. Unlike the Canadian Shield, northern Alberta is mantled with much thicker glacial deposits that are covered by the Northern Boreal Forest. This limits the use of conventional image classification techniques, as there is not a one-to-one relationship between vegetation and the underlying surficial sediments. The RADARSAT-1 data utilized consists of RADARSAT-1 imagery acquired using Standard Beam 1 and 7 in both ascending and descending passes. Moisture and surface roughness information can be extracted by applying algorithms that calculate the differences between images acquired from different incidence angles and look directions (ascending versus descending looks). The image created using different incidence angles highlights flat surfaces, including wetlands, agricultural areas, and forest fire scars. The image generated using opposing look directions enhances geomorphologic features, including ice flow features, meltwater channels, till hummocks, and sand dune ridges. In addition, the enhanced RADARSAT-1 imagery (includes integration of topographic information provided by a digital elevation model (DEM)) provides an additional level of confidence to the air photo interpretation conducted in regions with little or no ground access and also provides a regional perspective on large-scale subtle surface morphological elements (e.g., ice flow patterns) that might be overlooked in individual aerial photographs.

[1]  R. Bell.  Geological Survey of Canada , 1885, Nature.

[2]  R. Fulton.  Quaternary stratigraphy of Canada : a Canadian contribution to IGCP Project 24 , 1984 .

[3]  D. Lemmen,et al.  Late glacial drainage systems along the northwestern margin of the Laurentide Ice Sheet , 1994 .

[4]  H. Bostock.  Physiographic regions of Canada , 1970 .

[5]  Penny Masuoka,et al.  Shuttle Imaging Radar (SIR-B) Investigations of the Canadian Shield: Initial Report , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[6]  J. Burns.  Vertebrate paleontology and the alleged ice-free corridor: The meat of the matter , 1996 .

[7]  J. Harris,et al.  Remote predictive mapping of surficial materials on northern Baffin Island: developing and testing techniques using Landsat TM and digital elevation data , 2007 .

[8]  D. Vitt,et al.  Peatland Initiation During the Holocene in Continental Western Canada , 1998 .

[9]  Lithologic mapping of gabbro and peridotite sills in the Cape Smith Fold and thrust belt with Thematic Mapper and airborne radar data , 1994 .

[10]  Katrin Molch,et al.  Geological case studies related to RADARSAT-2 , 2004 .

[11]  F. Ulaby,et al.  Microwave Backscatter Dependence on Surface Roughness, Soil Moisture, and Soil Texture: Part I-Bare Soil , 1978, IEEE Transactions on Geoscience Electronics.

[12]  F. Kenny,et al.  Radar Imagery for Quaternary Geological Mapping in Glaciated Terrains , 1992 .

[13]  T. Bell,et al.  DIGITAL ELEVATION MODELS FROM SHUTTLE RADAR TOPOGRAPHY MISSION DATA - NEW INSIGHTS INTO THE QUATERNARY HISTORY OF NEWFOUNDLAND , 2006 .

[14]  V. Singhroy,et al.  Methods for Remote Engineering Geology Terrain Analysis in Boreal Forest Regions of Ontario, Canada , 2004 .

[15]  John A. Richards,et al.  Remote Sensing Digital Image Analysis , 1986 .

[16]  S. Zoltai.  Cyclic Development of Permafrost in the Peatlands of Northwestern Alberta, Canada , 1993 .

[17]  Joong-Sun Won,et al.  ERS-1 AND CCRS C-SAR Data Integration For Look Direction Bias Correction Using Wavelet Transform , 1994 .

[18]  C. Clark,et al.  A highly mobile Laurentide ice sheet revealed by satellite images of glacial lineations , 1990, Nature.

[19]  J. Harris,et al.  Case study 7. Classification of remotely sensed imagery for surficial geological mapping in Canada's North , 2008 .

[20]  V. Singhroy,et al.  Effects of Relief on the Selection of RADARSAT-1 Incidence Angle for Geological Applications , 1999 .

[21]  A. Dyke.  An outline of North American deglaciation with emphasis on central and northern Canada , 2004 .

[22]  Wooil M. Moon,et al.  RADARSAT and Radar Geology in Canada , 1993 .

[24]  Shaun Quegan,et al.  Radar Remote Sensing , 1999 .

[25]  F. Paganelli,et al.  Use of RADARSAT-1 principal component imagery for structural mapping: a case study in the Buffalo Head Hills area, northern central Alberta, Canada , 2003 .

[26]  Jeff R. Harris,et al.  Digital processing of orbital radar data to enhance geologic structure - Examples from the Canadian Shield , 1988 .

[27]  A. Gillespie,et al.  Remote Sensing in Geology , 1980 .

[28]  E. Grunsky,et al.  The application of principal components analysis to multi-beam RADARSAT-1 satellite imagery: A tool for land cover and terrain mapping , 2002 .

[29]  J. Harris,et al.  Remote predictive mapping: an aid for northern mapping , 2008 .

[30]  J. Harris,et al.  The Utilization of RADARSAT-1 Imagery for the Characterization of Terrestrial Impact Landforms , 1999 .

[31]  W. H. Mathews.  Retreat of the last ice sheets in northeastern British Columbia and adjacent Alberta , 1980 .

[32]  Computer-enhancement techniques for the integration of remotely sensed, geophysical, and thematic data for the geosciences , 1994 .

[33]  D. Grant,et al.  Airborne SAR for surficial geological mapping , 1994 .