Can I use this Python function for each row of a tabe ?

[BlueSky]

I have a table called Activity, there is a coloum called Polyline.
For each polyline I want to return it's corresponding longatude and lattitude cordinates.

A polyline is a way of encoding a series of cordinates as a string. There algorithm to do this is described here:
https://developers.google.com/maps/documentation/utilities/polylinealgorithm

I have found a Python script and function which converts a polyline into a list of longatude and lattitude cordinates:

# This function is free of any dependencies.
def decode_polyline(polyline_str):
    '''Pass a Google Maps encoded polyline string; returns list of lat/lon pairs'''
    index, lat, lng = 0, 0, 0
    coordinates = []
    changes = {'latitude': 0, 'longitude': 0}

    # Coordinates have variable length when encoded, so just keep
    # track of whether we've hit the end of the string. In each
    # while loop iteration, a single coordinate is decoded.
    while index < len(polyline_str):
        # Gather lat/lon changes, store them in a dictionary to apply them later
        for unit in ['latitude', 'longitude']: 
            shift, result = 0, 0

            while True:
                byte = ord(polyline_str[index]) - 63
                index += 1
                result |= (byte & 0x1f) << shift
                shift += 5
                if not byte >= 0x20:
                    break

            if (result & 1):
                changes[unit] = ~(result >> 1)
            else:
                changes[unit] = (result >> 1)

        lat += changes['latitude']
        lng += changes['longitude']

        coordinates.append((lat / 100000.0, lng / 100000.0))

    return coordinates

Borrowed from here https://github.com/geodav-tech/decode-google-maps-polyline

Is it possible to use this Python funciton in PowerBI and pass the polyline for each Activity and return it's coordinates?

[v-lionel-msft · Accepted solution]

Hi @BlueSky ,

Try to transform the data in Power Query with Python script, then create visuals.

Best regards,
Lionel Chen

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