topo alternatives and similar packages
Based on the "Geolocation" category.
Alternatively, view topo alternatives based on common mentions on social networks and blogs.

geoip
Elixir library to find geo location information given an IP address, hostname or Plug.Conn 
distance_api_matrix
Google Distance Matrix API Library for Elixir 
ipgeobase
Find Russian and Ukraine city by IP address and find country for other country Elixir 
srtm
Query locations for elevation data from the NASA Shuttle Radar Topography Mission
Build timeseriesbased applications quickly and at scale.
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README
Geometry Library for Elixir
A Geometry library for Elixir that calculates spatial relationships between two geometries. Geometries can be of any of the following types:
 Point
 LineString
 Polygon
 MultiPoint
 MultiLineString
 MultiPolygon
Installation
defp deps do
[{:topo, "~> 0.4.0"}]
end
Usage
The Topo
module provides functions for determining the relationship between
two geometries. Each function returns a boolean and accepts any combination of
Point, LineString, Polygon, MultiPoint, MultiLineString, or MultiPolygon.
intersects?
 Geometries A and B share at least one point in common.disjoint?
 Disjoint geometries share no points in common. This is the direct opposite of theintersects?
result.contains?
 All points of geometry B lie within A. See section below on [Contains].within?
 This is the direct inverse ofcontains?
. All points of geometry A lie within geometry B.equals?
 Geometries A and B are equivalent and cover the exact same set of points. By definition, A and B are equal if A contains B and B contains A. Equality does not necessarily mean that the geometries are of the same type. A Point A is equal to a MultiPoint that contains only the same Point A.
Each of these functions can be passed any two Geometries in either a Map with a
:type
and :coordinates
keys or as a struct generated via the Geo library
(https://github.com/bryanjos/geo). Coordinates are represented as atoms {x, y}
and multiple coordinates as Lists.
a = %{type: "Polygon", coordinates: [[{2, 2}, {20, 2}, {11, 11}, {2, 2}]]}
b = %Geo.Polygon{coordinates: [[{2, 2}, {20, 2}, {11, 11}, {2, 2}]]}
Topo.equals? a, b # => true
Instead of a Point geometry, just a single coordinate can be used.
a = %{type: "Polygon", coordinates: [[{2, 2}, {20, 2}, {11, 11}, {2, 2}]]}
Topo.intersects? a, {4, 6} # => true
The Topo
library's functions will automatically attempt to "clean" geometries
passed to them:
 Linear Rings (including Polygons) will be reordered to a counterclockwise direction.
 Polygon's Linear Rings will automatically be closed if the first point is not repeated as the last point.
 Points that are equal or collinear with surrounding points are removed from LineStrings or Polygons.
A note on contains?
There are a few nonobvious special cases that are worth mentioning:
 A Polygon does not contain its own boundary. Specifically a LineString that is the exact same as a Polygon's exterior Linear ring is not contained within a that Polygon.
a = %Geo.Polygon{coordinates: [[{2, 2}, {20, 2}, {11, 11}, {2, 2}]]}
b = %Geo.LineString{coordinates: [{2, 2}, {20, 2}, {11, 11}, {2, 2}]}
Topo.contains? a, b # => false
Topo.intersects? a, b # => true
 A LineString does not contain it's own first and last point (unless those points are the same, as in a LinearRing)
a = %Geo.LineString{coordinates: [{1, 3}, {2, 1}, {0, 1}]}
b = %Geo.LineString{coordinates: [{1, 3}, {2, 1}, {0, 1}, {1, 3}]}
Topo.contains? a, {1, 3} # => false
Topo.intersects? a, {1, 3} # => true
Topo.contains? b, {1, 3} # => true
Tests
> mix test