I have 1000 or so points on a map, (I have GPS coordinates. I would like to use google maps to find the shortest distance using roads, between pairs of points. I would like to measure all pairs within a distance of 100km. Is this possible?
It is possible, but you may run against usage limits:
Users of the free API: 100 elements per query. 100 elements per 10 seconds. 2 500 elements per 24 hour period.
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