Tool Name	Hypsometry
Tool ID	5
Library ID	ta_morphometry
Version	1.0
Author(s)	O.Conrad (c) 2001

Description

Calculates the hypsometric curve for a given DEM.

The hypsometric curve is an empirical cumulative distribution function of elevations in a catchment or of a whole planet. The tool calculates both the relative (scaled from 0 to 100 percent) and absolute (minimum to maximum values) distributions. The former scales elevation and area by the maximum values. Such a non-dimensional curve allows one to asses the similarity of watersheds as differences in hypsometric curves arise from different geomorphic processes shaping a landscape.

In case the hypsometric curve should not be calculated for the whole elevation range of the input dataset, a user-specified elevation range can be specified with the classification constant area.

The output table has two attribute columns with relative height and area values, and two columns with absolute height and area values. In order to plot the non-dimensional hypsometric curve as diagram, use the relative area as x-axis values and the relative height for the y-axis. For a diagram with absolute values, use the absolute area as x-axis values and the absolute height for the y-axis.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	ELEVATION
Output
Hypsometry	table, output	TABLE
Options
Number of Classes	integer number	COUNT	Number of discrete intervals (bins) used for sampling	Minimum: 1 Default: 100
Sort	choice	SORTING	Choose how to sort the elevation dataset before sampling	Available Choices: [0] up [1] down Default: 1
Classification Constant	choice	METHOD	Choose the classification constant to use	Available Choices: [0] height [1] area Default: 1
Use Z-Range	boolean	BZRANGE	Use a user-specified elevation range instead of min/max of the input dataset	Default: 0
Z-Range	value range	ZRANGE	User specified elevation range