Sqrdist - ObjectVision/GeoDMS GitHub Wiki
Geometric functions sq(ua)r(e)dist(ance)
syntax
- sqrdist(destination, origin)
definition
sqrdist(destination, origin) calculates the square distance (as the crow flies) between origin and destination points of the same domain unit.
The resulting data item has a float32 value type without metric. Use the value function to convert the result to the requested values unit.
description
The sqrdist calculates faster than the dist function and can be used if only the distance order is relevant.
applies to
- destination and origin are data items with Point value type
conditions
The values unit and domain unit of the destination and origin arguments must match.
example
attribute<m2> sqrdistOD (ADomain) := value(sqrdist(destination, origin), m2);
| destination | origin | sqrdistOD |
|---|---|---|
| {401331, 115135} | {401331, 115135} | 0 |
| {399501, 111793} | {399476, 111803} | 725 |
| {399339, 114883} | {399289, 114903} | 2900 |
| {401804, 111323} | {401729, 111353} | 6525 |
| {398796, 111701} | {398696, 111741} | 11600 |
ADomain, nr of rows = 5