polygons | 易学教程

Combine Voronoi polygons and maps

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问题 I would like to combine Voronoi polygons with map, in order to use this later for spatial analysis. I have number of points and shapefile that i want to combine and then save as shapefile/spatial polygons. To get voronoi polygons i use function from this topic. My code is as follows: coords<-data.frame(LONG=c(16.9252,16.9363,16.9408,16.8720,16.9167,16.9461,16.9093,16.9457,16.9171,16.8506,16.9471,16.8723,16.9444,16.9212,16.8809,16.9191,16.8968,16.8719,16.9669,16.8845), LAT=c(52.4064,52.4266,52

Marker cluster number in a polygon or/and infowindow

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问题 When you click on some polygon you got infowindow with the name of these polygon, is possible to put in this infowindow number of markers inside this polygon (same like marker cluster number) or to put this number (marker cluster number) on the polygon? <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <meta name=

Identify if point is in the polygon

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问题 As per my requirement, I am drawing polygons on google map shown in the image below.(using maps v2) Now I need to show an alert when user enters that particular polygons. How to identify if my current location is with in the polygon. (Need optimized way without draining battery) Thanks in advance. 回答1: Just tried Ray Casting algorithm which identifies point in polygon. This works perfect. Refer http://en.wikipedia.org/wiki/Point_in_polygon for thesis of Ray-Casting private boolean