Hi, thanks for the nn2 function, it has transformed the efficiency of distance calculations for large datasets. I have a related problem, where I would like to calculate the distance from each point to the closest point on a line. I can convert the line to a set of coordinates and then run nn2, however, this is sort of cheating as it doesn't formally calculate distance to the line that connects each of those coordinates. I just wondered whether you were working on (or could be persuaded to! :)) a function to do this? At the moment dist2line from geosphere is the best option I have, but it is very slow, even if parallelized, on large datasets. I'm working on a function to first find the nearest line, then sample points along that line and run nn2, but its pretty inelegant...
Thanks again!
Hi, thanks for the nn2 function, it has transformed the efficiency of distance calculations for large datasets. I have a related problem, where I would like to calculate the distance from each point to the closest point on a line. I can convert the line to a set of coordinates and then run nn2, however, this is sort of cheating as it doesn't formally calculate distance to the line that connects each of those coordinates. I just wondered whether you were working on (or could be persuaded to! :)) a function to do this? At the moment dist2line from geosphere is the best option I have, but it is very slow, even if parallelized, on large datasets. I'm working on a function to first find the nearest line, then sample points along that line and run nn2, but its pretty inelegant...
Thanks again!