kernelDensity http://mapfw.tangshannanhu.com/iserver/services/spatialAnalysis-NanHuJingQu-5/restjsr/spatialanalyst/datasets/%E6%99%AF%E5%8C%BA%E9%81%93%E8%B7%AF8411_1@%E5%8D%97%E6%B9%96%E6%99%AF%E5%8C%BA%E9%81%93%E8%B7%AF/densityanalyst/kernel