July 21, 2015
Assessing landscape change and processes of recurrence, replacement, and recovery in the Southeastern Coastal Plains, USA
By Mark Drummond (GECSC), Mike Stier (GECSC), Roger Auch, Janis Taylor, Glenn Griffith, Jodi Riegle (GECSC), Dave Hester (GECSC), Christopher Soulard, and Jamie McBeth (GECSC). Published in Environmental Management.
To better understand the various processes that cause land transformation, a data aggregation, validation, and attribution approach was developed and applied to an analysis of the Southeastern Coastal Plains. The approach integrates information from available national land-use, natural disturbance, and land-cover data to efficiently assess spatially-specific processes. Replacement processes, whereby a land use or cover is supplanted by a new land use, including urbanization and agricultural expansion, accounted for approximately 15% of the extent of change. Recurrent processes that contribute to cyclical changes in land cover, including forest harvest/replanting and fire, accounted for 83%. Most forest cover changes were recurrent, while the extents of recurrent silviculture and forest replacement processes such as urbanization far exceeded forest recovery processes. The total extent of landscape recovery, from prior land use to natural or semi-natural vegetation cover, accounted for less than 3% of change. Explicit identification of the process types and dynamics presented here may improve the understanding of land-cover change and landscape trajectory.
July 6, 2015
Onshore Industrial Wind Turbine Locations for the United States through July 2013
By Jay Diffendorfer (GECSC), Roger Compton, Louisa Kramer (GECSC), Zach Ancona (GECSC), and Donna Norton. USGS Data Series 817.
Unlike oil and gas wells, there has been a lack of publicly available information about wind turbines within the United States. This motivated a study by the USGS to map industrial-scale onshore wind turbine locations and record corresponding facility information and turbine technical specifications. The resulting database presented in this report has more than 47,000 wind turbine records that have been collected, digitized, locationally verified, and internally quality controlled.
July 1, 2015
Geologic map of the Orchard 7.5' quadrangle, Morgan County, Colorado
By Margaret Berry (GECSC), Janet Slate, Paul Hanson, and Ted Brandt (GECSC). USGS Scientific Investigations Map 3331.
The Orchard 7.5' quadrangle is located along the South Platte River corridor on the semi-arid plains of eastern Colorado, west of Ft. Morgan. The mapped area contains surficial deposits that record alluvial, eolian, and hillslope processes that have operated through environmental changes from the Pleistocene to the present. Along with the map and georeferenced map PDFs, this publication includes downloadable GIS files.