• A big data urban growth simulation at a national scale: Configuring the GIS and neural network based Land Transformation Model to run in a High Performance Computing (HPC) environment

      Pijanowski, B.C.; Tayyebi, A.; Douchette, J.; Pekin, Burak K.; Braun, D.; Plourde, J. (2014)
      The Land Transformation Model (LTM) is a Land Use Land Cover Change (LUCC) model which was originally developed to simulate local scale LUCC patterns…. This paper provides an overview of the new architecture which we discuss within the context of modeling LUCC that requires: (1) using an HPC to run a modified version of our LTM; (2) managing large datasets in terms of size and quantity of files; (3) integration of tools that are executed using different scripting languages; and (4) a large number of steps necessitating several aspects of job management.
    • Anthropogenic and topographic correlates of natural vegetation cover within agricultural landscape mosaics in Turkey

      Pekin, Burak K. (2016)
      ...I assessed the influence of anthropogenic and topographic variables on the extent of agricultural mosaics with high natural vegetation cover in the country of Turkey where a large extent of natural and semi-natural vegetation is maintained by traditional agriculture. GIS layers depicting human land use, elevation, slope, roads and population data were obtained and summarized at two spatial scales, within provinces and for 100km2 grid cells covering the country’s entire agricultural land area.…
    • Behavioral adaptations of a large carnivore to human activity in an extremely arid landscape

      Barocas, Adi; Hefner R.; Ucko M.; Merkle J. A.; Geffen Eli (2018)
      Abstract Driven by the availability of food subsidies and landscape transformation, large carnivore populations are increasingly inhabiting the vicinity of humans. To persist in human proximity, while avoiding conflict and mortality, they must make adjustments in their spatial behavior....
    • Examination of enrichment using space and food for African elephants (Loxodonta africana) at the San Diego Zoo Safari Park

      Hacker, CE; Miller, Lance J.; Schulte, BA (2018)
      Concern for elephant welfare in zoological facilities has prompted a number of exhibit and management modifications, including those involving enrichment. Knowledge of how these changes impact indicators of welfare, such as elephant movement and behaviour, is crucial for continued improvement of elephant husbandry and care....
    • Movement-based estimation and visualization of space use in 3D for wildlife ecology and conservation

      Tracey, Jeff A.; Sheppard, James; Zhu, Jun; Wei, Fuwen; Swaisgood, Ronald R.; Fisher, Robert N.; Sueur, Cédric; Sueur, Cédric (2014)
      Advances in digital biotelemetry technologies are enabling the collection of bigger and more accurate data on the movements of free-ranging wildlife in space and time. Although many biotelemetry devices record 3D location data with x, y, and z coordinates from tracked animals, the third z coordinate is typically not integrated into studies of animal spatial use. Disregarding the vertical component may seriously limit understanding of animal habitat use and niche separation. We present novel movement-based kernel density estimators and computer visualization tools for generating and exploring 3D home ranges based on location data. We use case studies of three wildlife species – giant panda, dugong, and California condor – to demonstrate the ecological insights and conservation management benefits provided by 3D home range estimation and visualization for terrestrial, aquatic, and avian wildlife research.