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River channels

River channels. Venkatesh Merwade, University of Texas at Austin. Data for channels. Bathymetry data for channels mainly include points with (x,y,z) attributes. Data can be collected using Traditional methods (surveying) Depth sounder (using a boat) LIDAR ( Light Detection and Ranging)

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River channels

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  1. River channels Venkatesh Merwade, University of Texas at Austin

  2. Data for channels • Bathymetry data for channels mainly include points with (x,y,z) attributes. • Data can be collected using • Traditional methods (surveying) • Depth sounder (using a boat) • LIDAR ( Light Detection and Ranging) • SAR (Synthetic Aperture Radar), etc.

  3. Centerline/Thalweg Cross-sections ProfileLines Data analysis Start with points Extract all the necessary information Create surface from points How do we do this…….

  4. Defining a Thalweg Input Output Step 2 Step 1 Step 3 Step 4 User defines an arbitrary centerline over the measurement points Thalweg tool creates a surface using the measurement points Densify the initial centerline to get more points Normals are drawn at each vertex of the centerline to locate deepest points All the deepest points replace the vertices of the old centerline Final result is a 3D polyline defining the thalweg Old vertices New vertices

  5. Measure in ArcGIS A PolylineMZ can store m and z at each vertex along with x and y coordinates. 112.3213 64.0056 0

  6. r y m x Coordinate Transformation m is measure along the centerline r is distance across the river from the centerline Sinuous river becomes straight when transformed into (m,r) co-ordinates.

  7. FishNet Points are interpolated in ArcMap to produce a continuous surface. FishNet is generated in ArcMap using the FishNet tool.

  8. 3D Visualization in ArcScene

  9. Surface in transformed co-ordiantes Straightened river Profile line and cross-sections Sinuous river

  10. Straightened River in 3D

  11. Data back to x,y coordinates Profile lines and cross-sections in (x,y) created using FishNet in (m,r). Original river in X,Y

  12. FishNet comparison FishNet created in (r,m) Regular FishNet

  13. Profile Lines and Cross Sections in 3D Bird’s eye view!

  14. Thalweg/Centerline Cross-sections ProfileLines Fishnet GIS for River Channels Measurement points Surface Develop generic ways to create all the channel features from measurement points.

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