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Attendees:

Charlie Kost (SMSU)

Carrie Quast (Brown Cty)

Mark Volz (Lyon Cty)

Ryan Wendt (Lyon Cty)

Emma Volz (Lincoln Cty)

Randy Knipple (Dakota Cty)

John Shepard (SRDC)

Brian Fischer (Houston Eng.)

Agenda:

LiDAR: Using Spatial Analyst to Process Data

oData Needed: Elev. Info. (Raster DEM dataset or Contour Lines or LiDAR Pts.)

oSteps to follow:

§Create a FILLED GRID from Elev. Data

·Use Spatial Analyst tool -> Hydrology -> Fill

§Create FLOW DIRECTION GRID from FILLED GRID

·Use Spatial Analyst tool -> Hydrology -> Flow Direction

§Create FLOW ACCUMULATION GRID from the FLOW DIRECTION GRID

·Use Spatial Analyst tool -> Hydrology -> Flow Accumulation

§Create POUR POINT GRID from the FLOW ACCUMULATION GRID

·Use Use “Identify” tool onFLOW ACCUMULATION to find the value of the Pour Point cell

·Use Spatial Analyst tool -> Reclass -> Reclassify

oSet the value for the Pour Point cell to 1 and all other values to “No Data”

§Create a WATERSHED GRID from the FLOW DRIECTION and POUR POINT GRIDs

·Use Spatial Analyst tool -> Hydrology ->Watershed

§Convert WATERSHED GRID to polygon

·Use Conversion Tools -> From Raster -> Raster to Polygon

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*Next Meeting: April 13^th, 2011 on PostGIS (need presenter)

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