NDVI and ArcHydro

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

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

Acknowledgements

• Mike Leech• Dr. David Wallin• WWU SAL tech