Dotsptial计算元素距离和是否相交

IFeature ifeature1 ;

IFeature ifeature2;

var gm1 = (DotSpatial.Topology.Geometry)(ifeature1.BasicGeometry); // point

var gm2 = (DotSpatial.Topology.Geometry)(ifeature2.BasicGeometry); // point

bool result = gm1.Intersects(gm2);//是否相交

var distance = gm1.distance(gm2);//距离