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Lakemorpho provides a number of functions to calculate a standard suite of lake morphometry metrics. Most of the metrics are measurements of the shape of the lake. Metrics that rely on depth have traditionally been calculated with bathymetry data. In the absence of bathymetry data it is possible to estimate maximum depth from surrounding topography. Lakemorpho uses this approach to also estimate maximum depth, mean depth, and volume.
● Data Source:
CranContrib
● Keywords:
● Alias: lakemorpho
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lakeMorphoClass
(Package: lakemorpho) :
Function to create a lakeMorpho class - this is input to all other methods
This is a helper function that creates a lakeMorpho class object
● Data Source:
CranContrib
● Keywords:
● Alias: lakeMorphoClass
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lakeFetch
(Package: lakemorpho) :
Function to calculate fetch along an input bearing
The function calculates the maximum in lake distance of a line along an input bearing.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeFetch
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Maximum lake length is defined as the longest open water distance of a lake. This function determines the maximum lake length of lake by comparing the lenghts of a user defined number of lines. The user specifies a number of points to distribute along the lake shoreline and the point to point line lengths are checked for multiple intersections (i.e. line not just open water),starting with the longest line first. Function is currently very sensitive to pointDens and slows down considerably for larger values. Small values of point dens are acceptable for lakes withtout complex shorelines. Care needs to be taken in selecting an approriate pointDens and multiple values should be checked to ensure stability in the estimates.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeMaxLength
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lakeVolume
(Package: lakemorpho) :
Caluclates Lake Volume in R
This function returns lake volume for the input lake. The volume is calculated using maximum lake depth and maximum distance ratio to transform all pixels and thus, distances, to an estimated depth. These depths are multiplied by the area of the pixel and summed.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeVolume
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plot.lakeMorpho
(Package: lakemorpho) :
Default plotting of a lakeMorpho object
Plots the lakeMorpho class by showing lake, surround topography and in lake distance
● Data Source:
CranContrib
● Keywords:
● Alias: plot.lakeMorpho
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lakeMeanWidth
(Package: lakemorpho) :
Function to return lake Mean Width
Mean lake width is the result of lake surface area divded by the maximum length.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeMeanWidth
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This function returns the length of the shoreline of the lake and is simply the perimeter of the input lake polyogn.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeShorelineLength
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This function simply retruns the area of the lake SpatialPolygons that is part of the lakeMorphoClass class.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeSurfaceArea
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lakeSurroundTopo
(Package: lakemorpho) :
Calculate surrounding topography for lake
This function combines all input datasets into a lakeMorphoClass. As a part of this combination, the surrounding topography is also determined. If no input catchements are used, it is assumed that a buffer equal to the maximum in lake distance is used. If an input catchement is used, then the surrounding topography is the land area represented by the catchements that intersect the lake.
● Data Source:
CranContrib
● Keywords:
● Alias: lakeSurroundTopo
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