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Segmentation and VB width

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Summary

Disaggregate fluvial units (polygons or polylines) in DGO of chosen size. Output contains Polygon Width by DGO if the segmented feature was a Polygon.

Tags:
dgo, polygon, polyline, segmentation, transect, vector, disaggregation, centerline, width, valley bottom

Usage

Prior to assess metrics to characterize a fluvial system, fluvial units have to be disaggregated (Roux et al., 2014)1. This step enables to discretize a continuum with a constant length in order to provide a higher resolution for characterizing fluvial units. The constant length must be set precisely to ensure spatial trends or relationships between several variables to be correctly detected either at a network scale or at a local scale. Spatial disaggregation can be run both for linear (e.g. hydrographic network, centerline) and polygon feature (valley bottom, active channel).

Segmentation result

Algorithm:

if input type is polyline
  run segmentize algorithm

elif input type is polygon
  if a centerline is provided
    calculate a AXIS FID field on centerline
    run disaggregate polygon algorithm

For more details on the disaggregation process, please refer to the Disaggregate Polygon documentation.

Parameters

Parameter Description Type
Input features to segment
INPUT 		The feature to be segmented Polygon, MultiPolygon, LineString or MultiLineString
Centerline of the polygon to segment
CENTERLINE (Optional) 		Useful in case of a polygon feature to segment and
relates to the centerline of this input feature.
 LineString or MultiLineString
Segmentation step
STEP 		User-defined constant length used to disaggregate
the input feature (in map unit).
Default value: 25.0 		Number
Segmented features
OUTPUT 		The segmented output feature. Polygon or LineString (depend of input type)

See Also

  1. Roux, C., Alber, A., Bertrand, M., Vaudor, L., & Piégay, H. (2014). “FluvialCorridor”: A new ArcGIS toolbox package for multiscale riverscape exploration. Geomorphology. https://doi.org/10.1016/j.geomorph.2014.04.018 ↩