Find points are located at a radial distance of 20m from a point

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Ivan Mich
Ivan Mich 2021-1-1
评论： Cris LaPierre 2021-1-1
I have an ascii file, with two columns. The first has Latitude and the second has longtitude. Also I have one point (lets call it "MYPOINT") with spesific latitde and longtitude. I would like with the base of MYPOINT to find all the point in the radious/cirle distance of 20km (For example from the 100 points, the points that are located at a radial distance of 20m from the MYPOINT.
Which functions should I use?

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-1-1
Generate the points that make up the circle around myPoint, then use the inpolygon function to identify the points that are within the circle.
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Ivan Mich
Ivan Mich 2021-1-1
lat1, lon1, coordinates from several points and lat lon the coordinates from my stable point (MYPOINT)
Cris LaPierre
Cris LaPierre 2021-1-1
I know nothing about your script, and inpolygon now nothing about units. Look at the examples in the linked page for inpolygon and adapt to work with your data.

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