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Methods
ArcHydroTerrain Pre-Processing tools
• DEM fill• Flow Direction• Flow Length• Stream Segmentation• Conversion from raster to
vector
NDVI• Use NDVI to examine
vegetation in OFNW• Isolate north facing slopes
using the Model Maker• Use Knowledge Engineer to
mask out north facing slopes and NDVI vegetation value
• Model Maker to perform clump-sieve to get rid of unwanted pixels
Results & Conclusions
ArcHydro• Effective for calculating stream
and river networks
• Fast
• 5.9 hectares of streams in the OFNWR
• Extension is designed for major hydrologic resources (e.g. Nooksack River)
• DEM accuracy extends only as far as its resolution
– 10 m DEM – Small streams
NDVI• Final image contained too many
misclassified areas
• Streams not properly delineated
• Major vegetation coverage made stream identification difficult, even from 1 mtr image
– Leaf area
– Small streams
• Useful for larger hydrologic applications
– Tested in Bellingham