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The filter() function, from the documentation:

 

Panel

geopoints filter ( geopoints,geopoints )

A filter function to extract a subset of its geopoints input using a second geopoints as criteria. The two input geopoints must have the same number of values. The resulting output geopoints contains the values of the first geopoints where the value of the second geopoints is non-zero. It is usefully employed in conjunction with the comparison operators :

 freeze = filter(temperature,temperature < 273.15) 
The variable freeze will contain a subset of temperature where the value is below 273.15.

Use this in combination with what you have already done to produce a geopoints variable consisting only of the points within 10km of your chosen location.

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