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
lengths 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.
lakeMaxLength(inLakeMorpho, pointDens, addLine = TRUE)This returns a numeric value indicating the length of the longest line possible in the lake. Units are the same as the input data.
An object of lakeMorphoClass. Output of the
lakeSurroundTopo function would be appropriate as input
Number of points to place equidistant along shoreline. The maximum point to point distance that does not also intersect the shoreline is used. To total of n*(n-1)/2 comparisons is possible, but in practice is usually significant less.
Boolean to determine if the selected max length line should be added to the inLakeMorpho object. Defaults to True
Florida LAKEWATCH (2001). A Beginner's guide to water management - Lake Morphometry (2nd ed.). Gainesville: Florida LAKEWATCH, Department of Fisheries and Aquatic Sciences. Link
library(lakemorpho)
data(lakes)
lakeMaxLength(inputLM,25)
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