Peak range index (10 m raster data) (WMS service)
Description
The apex index represents a combined relief parameter of relative slope position and slope inclination. It is primarily used to determine vertex areas (relatively shallow locations). As a side effect, average values of the apex index usually indicate slopes or flattening (e.g. terraces, geest plates) Medium to high values indicate valley floors and very high values indicate steep slopes in a relative low position (e.g. terrace embankments and steep notched valleys).
It is calculated using the following formula: Vertex index = relHP + N where: relHP = relative slope position (inverted) N = slope inclination (inclinations > 60° -> = 60°, exponent = 0.4, normalized to 0.0 to 1.0)
By including the slope slope, the relief parameter relative slope position is modified in such a way that flattenings in the relative top position of the relief have very low values and there is a usually abrupt increase in the apex area index at the transition to the slopes.
Definition and calculation method: KÖTHE (2007), realized by SAGA module of scilands GmbH and SAGA module "Grid Calculator".
Resources
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=1233&Service=WMS&Request=GetCapabilities& |
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