Generate a unique ID for a line segment, based on the non-cryptographic murmur32 hash.
generateLineHash(x, precision=-1, algo='murmur32')
digits are rounded to this many places to the right (negative) or left (positive) of the decimal place
hash function algorithm
SpatialLinesDataFrame object must NOT contain multi-part features. The precision specified should be tailored to the coordinate system in use and the snapping tolerance used to create join decision line segments. A
precision of 4 is reasonable for geographic coordinates (snapping tolerance of 0.0001 degrees or ~ 10 meters). A
precision of -1 (snapping tolerance of 10 meters) is reasonable for projected coordinate systems with units in meters.
A vector of unique IDs created from the hash of line segment start and end vertex coordinates. Unique IDs are returned in the order of records of
x and can therefore be saved into a new column of the associated attribute table.
An error is issued if any non-unique IDs are generated. This could be casued by using coordiantes that do not contain enough precision for unique hashing.
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