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Published byHilary Leonard Modified over 8 years ago
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Re-evaluating estimates of impervious cover and riparian zone condition in New England watersheds: Green infrastructure effectiveness at the watershed scale Jessica Morgan 1, N. Detenbeck 2, S. Rego 2, Y.Q. Wang 3 1 ORISE Fellow U.S. EPA, ORD, NHEERL Atlantic Ecology Division, Narragansett, RI Ph.D. Student, Department of Natural Resources Science, University of Rhode Island, Kingston, RI 2 U.S. EPA, ORD, NHEERL Atlantic Ecology Division, Narragansett, RI 3 Laboratory for Terrestrial Remote Sensing, University of Rhode Island, Kingston RI 5 U.S. EPA, Region 1, Boston, MA
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Develop urbanization-response relationships for habitat and biotic communities across New England Compare condition of watersheds with green infrastructure (GI) BMPs/LID with expected condition based on watershed development (90% CI) –Historical data –New survey of watersheds with GI BMP/LID EPA Green Infrastructure Initiative - Region 1 RARE Project
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Preliminary Results – Macroinvertebrates and Periphyton Lower thresholds for impacts than the typical 10-12% impervious cover reported in the literature (Smucker et al. 2013, Detenbeck et al. 2013) 30m National Land Cover Dataset (NLCD) may be underestimating impervious cover and riparian zone condition
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Potential for improvement… Macroinvertebrate/Periphyton/Temperature Models Could benefit from improved impervious cover and riparian zone cover estimates using 1m National Agriculture Imagery Program (NAIP) data 1m NAIP imageryClassified 1m NAIP data30m NLCD data
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1m NAIP DOQQ Mallets Creek, VT
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Normalized Difference Vegetation Index (NDVI) Create NDVI band to extract water class NDVI = (NIR — VIS)/(NIR + VIS) NIR = Near infrared, VIS= Visible red Source: NASA
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NDVI Band for Mallets Creek
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Water Classification for Mallets Creek
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Adding in LIDAR Data Credit: RIGIS
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nDSM for Mallets Creek
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Intensity Band RI Lidar Tile 19_02864632
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Forest/Agriculture/Grass Classification for Mallets Creek
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Impervious Classification for Mallets Creek – Before Road Data
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Impervious Classification for Mallets Creek – After Road Data
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Impervious Classification for Mallets Creek
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Putting it all together… (with a conditional)
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Accuracy Assessment ERDAS IMAGINE Stratified Random Sampling – 50 points/strata Original data set and Google Earth historical imagery as reference data
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Accuracy Assessment Overall = 90.23% Kappa = 0.88 Conditional Kappas Water = 0.95 Impervious = 0.93 Forest/Tree = 0.95 Agriculture = 0.81 Grass/Other = 0.76
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IA Comparison ClassCurrent Study 2011 Lake Champlain NLCD 2006 NLCD 2011 Impervious.09 km 2 / 1.70km 2.08 km 2 / 1.49km 2.05 km 2 1.07km 2.06 km 2 / 1.23km 2 Watershed/Whole Tile
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Questions? morgan.jessica@epa.gov
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