Aug-17-2019, 07:39 AM

Hello,

I want to test whether they are within a polygon I have drawn. I have an CSV file with 5000 lines of latitude and longitude GPS coordinates. Now I want to set up a test to retun TRUE/FALSE as to whether the the GPS coordinate is inside the polygon.

My module point_in_poly(x,y,poly) works fine when I input the coordinates manually, but when I try to extract them from the CSV file I get an error message which after some Googling I cannot solve. It reads:

My code looks as follows:

// Thanks

I want to test whether they are within a polygon I have drawn. I have an CSV file with 5000 lines of latitude and longitude GPS coordinates. Now I want to set up a test to retun TRUE/FALSE as to whether the the GPS coordinate is inside the polygon.

My module point_in_poly(x,y,poly) works fine when I input the coordinates manually, but when I try to extract them from the CSV file I get an error message which after some Googling I cannot solve. It reads:

```
Error:
ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
```

Link to the CSV file: Download CSV fileMy code looks as follows:

# import import pandas as pd import csv # Test a vertex for inclusion df = pd.read_csv("ais_ray.csv") # Limit the dataset data = df.head(n=150) latitude_list = data["Latitude"] longitude_list = data["Longitude"] # Improved point in polygon test which includes edge # and vertex points def point_in_poly(x,y,poly): # check if point is a vertex if (x,y) in poly: return "INSIDE THE POLYGON" # check if point is on a boundary for i in range(len(poly)): p1 = None p2 = None if i==0: p1 = poly[0] p2 = poly[1] else: p1 = poly[i-1] p2 = poly[i] if p1[1] == p2[1] and p1[1] == y and x > min(p1[0], p2[0]) and x < max(p1[0], p2[0]): return "INSIDE THE POLYGON" n = len(poly) inside = False p1x,p1y = poly[0] for i in range(n+1): p2x,p2y = poly[i % n] if y > min(p1y,p2y): if y <= max(p1y,p2y): if x <= max(p1x,p2x): if p1y != p2y: xints = (y-p1y)*(p2x-p1x)/(p2y-p1y)+p1x if p1x == p2x or x <= xints: inside = not inside p1x,p1y = p2x,p2y if inside: return "IN THE POLYGON" else: return "OUTSIDE XXXXX" # polygon polygon = [(59.302521,10.594804), (53.658504,9.056718), (52.308005,4.652078), (58.525959,3.593316)] lat= latitude_list lon= longitude_list print(point_in_poly(lat, lon, polygon))I would be happy to hear what you think I can do to solve this.

// Thanks