Spatial Analysis of Drumlin Orientations
C. R. Gilstrap, M Greenwood, Kevin Norton · Publication Database GFZ (GFZ German Research Centre for Geosciences) · 2007
Patterns in the orientations of drumlins may hold insight into their formation, but have received limited attention in the literature. Conventional statistical methods can not be applied to orientation data, so techniques for circular statistics must be used. Specifically, we use geographically weighted techniques as in Brunsdon and Charlton (2006) to assess the spatial structure in the orientations of the Chautauqua drumlin field. The field is located in North Western Pennsylvania and Western New York State and contains 755 drumlins, mapped from a 10m DEM, in an area of approximately 2500 square kilometers (Norton and Lanier, 2007). We also consider regression trees for a circular response, as in Lund (2002), to build predictive models for the orientations using both the drumlin locations and other morphometric characteristics to explain the spatial variability of these subglacial landforms.