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Lat/long distance from a reference point v2 | BigML.com
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petersen
Public
petersen's
Scripts
2
Models
0
Datasets
0
151
FREE
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Lat/Long Distance from a reference point v2
Details:
Created
Tue, 8 Nov 2016 08:11:53 +0000
Published
Tue, 8 Nov 2016 09:05:26 +0000
Description:
Extends a dataset with the distance in meters between lat/long fields and a reference point.
Tags:
geolocation
latitude
longitude
URL:
https://horizon.bigml.com/user/petersen/gallery/script/582188c949c4a14ae2000f77
Script
FREE
Source code
; Computes the distance between lat/long coordinates and a reference point ; All lat/long coordinates must be in signed degrees (no N/W/S/E etc) ; ; inputs are the dataset to transform, the field names of the ; LATITUDE and LONGITUDE in the dataset and the LAT/LONG coordinates of a ; reference point. ; ; output is a new dataset with the distance, in meters, between the ; LAT/LONG field and the reference point in a new column named "Distance (m)" ; ; This implementation is based on code provided here: ; http://www.movable-type.co.uk/scripts/latlong.html (define (latlong-ref-dist dataset-in lat-field long-field lat-ref long-ref) (let (haversine (flatline "(let (R 6371000 " " latA (to-radians {lat-ref}) " " latB (to-radians (field {{lat-field}}))" " latD (- latB latA)" " longD (to-radians (- (field {{long-field}})" " {long-ref}))" " a (+ (square (sin (/ latD 2)))" " (* (cos latA)" " (cos latB)" " (square (sin ( / longD 2)))))" " c (* 2 (asin (min (list 1 (sqrt a))))))" " ( * R c ))")) (create-and-wait-dataset {"origin_dataset" dataset-in "new_fields" [{"field" haversine "name" "Distance (m)"}]}))) (define dataset-out (latlong-ref-dist dataset-in lat-field long-field lat-ref long-ref))
Description
Extends a dataset with the distance in meters between lat/long fields and a reference point.
Extends a dataset with the distance in meters between lat/long fields and a reference point.
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Inputs
Outputs
License:
Creative Commons Zero V1.0
Script
FREE
Lat/long distance from a reference point v2 | BigML.com
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