Browsing by Subject "lidar"
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Item A lidar-based approach to measure channel incision in headwater streams in an urbanizing landscape(2018-01-01) Metes, Marina Jean; Miller, Andrew J; Geography and Environmental Systems; Geography and Environmental SystemsStream channel incision can occur following landscape disturbances commonly related to urbanization. A method was developed to map reach-scale incision from lidar-derived digital elevation models using topographic openness, a landscape metric measuring the enclosure of an area (i.e. channel bottoms) relative to the surrounding landscape (i.e. stream banks). The method was validated with field surveys and local photogrammetric models of stream banks. The method was then applied to watersheds undergoing urban development with lidar coverage for six time steps spanning an 11 year period. Channel incision was detected near the outlet of newly developed stormwater management facilities, but temporal analysis also identified areas already severely incised prior to urbanization, highlighting influence from previous agricultural land use, as well as areas that have resisted incision following urbanization. Although incision patterns varied across each watershed, there appeared to be no direct connection to the placement of SWM facilities beyond outlets.Item Vertically Resolved Precipitation Intensity Retrieved through a Synergy between the Ground-Based NASA MPLNET Lidar Network Measurements, Surface Disdrometer Datasets and an Analytical Model Solution(Molecular Diversity Preservation International (MDPI), 2018-07-11) Lolli, Simone; D’Adderio, Leo Pio; Campbell, James R.; Sicard, Michaël; Welton, Ellsworth J.; Binci, Andrea; Rea, Alessandro; Tokay, Ali; Comerón, Adolfo; Barragan, Ruben; Baldasano, Jose Maria; Gonzalez, Sergi; Bech, Joan; Afflitto, Nicola; Lewis, Jasper R.; Madonna, FabioIn this paper, we illustrate a new, simple and complementary ground-based methodology to retrieve the vertically resolved atmospheric precipitation intensity through a synergy between measurements from the National Aeronautics and Space Administration (NASA) Micropulse Lidar network (MPLNET), an analytical model solution and ground-based disdrometer measurements. The presented results are obtained at two mid-latitude MPLNET permanent observational sites, located respectively at NASA Goddard Space Flight Center, USA, and at the Universitat Politècnica de Catalunya, Barcelona, Spain. The methodology is suitable to be applied to existing and/or future lidar/ceilometer networks with the main objective of either providing near real-time (3 h latency) rainfall intensity measurements and/or to validate satellite missions, especially for critical light precipitation (<3 mm h⁻¹).