## How to check if coordinate inside certain area Python

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Lets say I have 2 kind of coordinate, first called `center_point`

and second called `test_point`

. I want to know if `test_point`

coordinate is inside near or not to `center_point`

coordinate by applying `radius`

threshold. If I write it, its like:

center_point = [{'lat': -7.7940023, 'lng': 110.3656535}] test_point = [{'lat': -7.79457, 'lng': 110.36563}] radius = 5 # in kilometer

How to check if the `test_point`

inside or outside the radius from `center_point`

in Python? how I perform this kind task in Python?

Result expected will say that `test_point`

inside or outside the `radius`

from `center_point`

coordinate.

from recommendation of @user1753919 in his/her comment, I got the answer here: Haversine Formula in Python (Bearing and Distance between two GPS points)

final code:

from math import radians, cos, sin, asin, sqrt def haversine(lon1, lat1, lon2, lat2): """ Calculate the great circle distance between two points on the earth (specified in decimal degrees) """ # convert decimal degrees to radians lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2]) # haversine formula dlon = lon2 - lon1 dlat = lat2 - lat1 a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2 c = 2 * asin(sqrt(a)) r = 6371 # Radius of earth in kilometers. Use 3956 for miles return c * r center_point = [{'lat': -7.7940023, 'lng': 110.3656535}] test_point = [{'lat': -7.79457, 'lng': 110.36563}] lat1 = center_point[0]['lat'] lon1 = center_point[0]['lng'] lat2 = test_point[0]['lat'] lon2 = test_point[0]['lng'] radius = 1.00 # in kilometer a = haversine(lon1, lat1, lon2, lat2) print('Distance (km) : ', a) if a <= radius: print('Inside the area') else: print('Outside the area')

Thanks

**Check if point is within radius of another point with Shapely ,** To effectively use shapely it is important to first project your coordinates into a projected coordinate system that is appropriate to your region, Lets say I have 2 kind of coordinate, first called center_point and second called test_point. I want to know if test_point coordinate is inside near or not to center_point coordinate by applying radius threshold. If I write it, its like:

GeoPy can handle it gracefully:

from geopy import distance center_point = [{'lat': -7.7940023, 'lng': 110.3656535}] test_point = [{'lat': -7.79457, 'lng': 110.36563}] radius = 5 # in kilometer center_point_tuple = tuple(center_point[0].values()) # (-7.7940023, 110.3656535) test_point_tuple = tuple(test_point[0].values()) # (-7.79457, 110.36563) dis = distance.distance(center_point_tuple, test_point_tuple).km print("Distance: {}".format(dis)) # Distance: 0.0628380925748918 if dis <= radius: print("{} point is inside the {} km radius from {} coordinate".format(test_point_tuple, radius, center_point_tuple)) else: print("{} point is outside the {} km radius from {} coordinate".format(test_point_tuple, radius, center_point_tuple))

or if you need to know the great circle distance:

dis = distance.great_circle(center_point_tuple, test_point_tuple).km print("Distance: {}".format(dis)) # Distance: 0.0631785164583489

**Find if a point lies inside a Circle,** C · C++ · Java · Python · C# · Javascript · JQuery · SQL · PHP · Scala · Perl · Go Language · HTML · CSS · Kotlin Given a circle (coordinates of centre and radius) and a point (coordinate), find if the point lies inside If distance is less than or equal to radius. the point is inside, else outside. C++ program to check if a point. Point in Polygon & Intersect¶. Finding out if a certain point is located inside or outside of an area, or finding out if a line intersects with another line or polygon are fundamental geospatial operations that are often used e.g. to select data based on location.

from math import sqrt a = center_point[0]['lat'] - test_point[0]['lat'] b = center_point[0]['lng'] - test_point[0]['lng'] c = sqrt(a * a + b * b) if (c < radius): print("inside") else: print("outside")

**How to check if a given point lies inside or outside a polygon ,** Given a polygon and a point 'p', find if 'p' lies inside the polygon or not. The points lying on the border are considered inside. We strongly recommend to see the Instead of computing xinters, check if (point.x - p1x)* (p2y-p1y) <= (point.y-p1y)* (p2x-p1x). However, casting the vertex coordinates to integers could introduce errors if they aren't already integers to start with. – chepner May 18 '13 at 16:19. 1. or use Python 3, which doesn't truncate to integers on division.

**Point in Polygon & Intersect,** Finding out if a certain point is located inside or outside of an area, or finding out if a line intersects with Let's check if those points are within the polygon. Point in Polygon & Intersect¶. Finding out if a certain point is located inside or outside of an area, or finding out if a line intersects with another line or polygon are fundamental geospatial operations that are often used e.g. to select data based on location.

**JavaScript basic: Check whether a point lies strictly inside a given ,** JavaScript exercises, practice and solution: Write a JavaScript program to check whether a point lies strictly inside a given circle. Find the points inside a square with a square hole. Define a square region with a square hole. Specify the vertices of the outer loop in a counterclockwise direction, and specify the vertices for the inner loop in a clockwise direction. Use NaN to separate the coordinates for the outer and inner loops.

**How to find whether a point is inside or outside the region?,** Programmatically (using matlab code), how do i find whether a given point is inside If it is black, then the coordinate is inside the region otherwise it is in outside region. mean by "inside" the region) for each cluster, and check if the point is inside What are the best libriaries for processing 3d point cloud data( Python) ? Find if a point lies inside, outside or on the circumcircle of three points A, B, C. Check whether the point (x, y) lies on a given line. Check if a given circle lies completely inside the ring formed by two concentric circles. Check if a point is inside, outside or on the ellipse.

##### Comments

- Calculate distance using haversine formula stackoverflow.com/questions/4913349/… and see if it is less than r
- hi @user1753919 thanks, it works.
- hi, whats the
`aa`

and`bb`

inside`c = math.sqrt(aa + bb)`

refer to? - Sorry, bad formatting. I edited it to be more clear.
- how can this be used to be tested on the entire dataframe with less computational cost?
- This should be done more efficiently with a KDTree or kNearestNeighbors algorithm, but I haven't found any examples that actually work with lat-lon points yet.