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Inflection Disaggregation (Morphometry)

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Summary

Disaggregate input polyline on inflection points and calculate bendlength, wavelength, sinuosity, amplitude, omega0 and omega1 of each disaggregated segment. Return also attributed inflection points and inflection lines.

Tags:
hydrography, sinuosity, inflection, centerline, polyline, disaggregation, longitudinal profile, morphometry, metrics

Usage

In order to characterize fluvial corridors thanks to a set of metrics, it is necessary to create entities which do not necessarily have a physical reality (Roux et al., 2014)1. It is the case of the inflection line, used during a set of planimetric metrics assessment such as the streamline sinuosity or the half-amplitude of bends. The inflection line of a curve is defined as the line passing through its inflection points.

This workflow simplyfy and smooth the input network, then extract inflection points. If you prefer to use the raw network without simplification, use the Planform Metrics algorithm directly.

Planform Metrics

Algorithm: 

run multipart to singlepart on network
simplify network (Douglas-Peucker method) by simplify offset parameter
smooth network
run Planform Metrics algorithm

Parameters

Parameter Description Type
Input sequenced network
INPUT 		Linear features on which the inflection lines and inflection points are extracted. Can be a unique LineString or a full network LineString or MultiLineString
Simplification offset
SIMPLIFY 		Threshold used to ignore small fluctuations and noise (in map unit) Default value: 10.0 Number
Maximum distance between inflection points
MAX_DISTANCE 		Maximum distance between two inflection points (in map unit) Default value: 200.0 Number
Minimum amplitude
MIN_AMPLITUDE 		Minimum amplitude of a bend to be considered (in map unit) Default value: 10.0 Number
Maximum angle to consider a point as inflection
MAX_ANGLE 		Maximum angle to create an inflection point (in degrees) Default value: 50.0 Number
Ouput inflection points
OUTPUT_POINTS 		The output inflection points Points
Ouput inflection lines
OUTPUT_LINES 		The output inflection lines LineString
Ouput disaggregated network
OUTPUT_DISAGGREGATED 		The output disaggregated line features LineString

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 ↩