Transcript Document
Stacie Wolny, Gregg Verutes Spatial input layers • Use an appropriate resolution for your goals - Detail/scenarios/speed • Choose an appropriate number of land cover classes - 1 agriculture class vs multiple crop types • Have all data in the same projected coordinate system • Check the units Stream buffers 10/20/30m Prepare the DEM • Fill holes • Compare watersheds or • Burn streams • Make watersheds with ArcHydro/ArcSWAT/AGWA • Fill sinks Compare change * / percent change Percent change can be very useful… Return on Investment Tulua Guabas - Total budget (US$ millions) Total budget (US$ millions) Symbology * Symbolizing across multiple layers: Symbology -> Import N Retention N Retention Scenario 1 Splitting up +/- rasters N Retention Scenario 2 Scenario 2.1 Compare tradeoffs between services Biofuels Subdivision Ag & Forestry Carbon Storage Water Quality Water Yield Income Compare tradeoffs between services Biofuels Subdivision Ag & Forestry Carbon Storage Water Quality Water Yield Income Rank across multiple services Water yield Total Relative ES provision x1 1.0 0.35 + Sediment retention x2 1.0 0 = Aggregating results • Can aggregate within countries, parcels, land cover classes, etc • Make sure that your data covers the whole area of interest Serviceshed: A specific area that provides a service to a group of people • Hydrology: watershed • Pollination: foraging range • Recreation: travel distance If servicesheds overlap, total service > supply Overlay with other data Carbon stock + tiger habitat Overlay with other data 500 5000 % ! 400 % difference in services between TCLs and rest of landscape in 2008 300 200 100 0 -100 -200 Carbon stocks / ha Water yield runoff depth Sediment retained / ha Uncertainty / Calibration Uncertainty: Run model with min, max, mean inputs to get the range Calibrate: For annual models, use time-sensitive inputs (like climate) averaged over 10 years if possible. Compare with measured data. Nitrogen loading, Hainan, China 7000 y = 1.11x R² = 0.92 p < 0.01 Simulated total nitrogen (t) 6000 5000 4000 3000 2000 1000 0 0 1000 2000 3000 4000 Observed total nitrogen (t) 5000 6000