object

geospatial

Geospatial predicates over geographic coordinates represented as (Latitude,Longitude).

Availability:
logtalk_load(geospatial(loader))
Author: Paulo Moura
Version: 0:2:0
Date: 2026-02-25
Compilation flags:
static, context_switching_calls
Implements:
public geospatial_protocol
Uses:
list
Remarks:

  • Distance unit: Kilometers.

  • Coordinate ranges: Latitude values must be in the [-90.0,90.0] range and longitude values in the [-180.0,180.0] range.

Inherited public predicates:
 along_track_distance/4  bbox_contains/2  bbox_expand/3  bbox_from_coordinates/2  bbox_intersects/2  bbox_union/3  bounding_box/3  clockwise_polygon/2  close_polygon/2  coordinates_bounding_box/2  counterclockwise_polygon/2  cross_track_distance/4  destination_point/4  equirectangular_inverse/4  equirectangular_projection/4  final_bearing/3  haversine_distance/3  initial_bearing/3  interpolate_great_circle/4  interpolate_rhumb/4  is_clockwise_polygon/1  is_valid_polygon/1  mean_center/2  midpoint/3  minimum_enclosing_circle/3  nearest_coordinate/5  nearest_point_on_polyline/4  nearest_point_on_segment/4  normalize_coordinate/2  normalize_polygon_orientation/3  point_in_polygon/2  point_to_polyline_distance/3  polygon_area/2  polygon_bounding_box/2  polygon_centroid/2  polygon_orientation/2  polygon_perimeter/2  polygon_perimeter/3  polygons_intersect/2  polyline_length/2  polyline_length/3  polyline_resample/3  polyline_simplify/3  polyline_split_at_distance/4  rhumb_bearing/3  rhumb_destination_point/4  rhumb_distance/3  rhumb_midpoint/3  route_distance/2  route_distance/3  route_distance/4  valid_coordinate/1  vincenty_distance/3  within_distance/4

Public predicates

distance/4

Computes the distance in kilometers between two coordinates using a selected metric. Supported metrics are haversine, vincenty, and rhumb.

Compilation flags:
static
Template:
distance(Coordinate1,Coordinate2,Metric,Distance)
Mode and number of proofs:
distance(+compound,+compound,+atom,-float) - zero_or_one

distance/5

Computes the distance between two coordinates using a selected metric and output unit. Supported metrics are haversine, vincenty, and rhumb. Valid Unit argument values are kilometers, meters, miles, and nautical_miles.

Compilation flags:
static
Template:
distance(Coordinate1,Coordinate2,Metric,Unit,Distance)
Mode and number of proofs:
distance(+compound,+compound,+atom,+atom,-float) - zero_or_one

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)

See also

geospatial_protocol, numberlist