Design and experiment of heat map rules based on road network constraints
DU Xiao, ZHOU Yuxiu, ZHOU Qi, ZHENG Yi, ZHANG Junhui, LIN Shangwei, CHEN Lijun
Bulletin of Surveying and Mapping . 2020, (7): 18 -21 .  DOI: 10.13474/j.cnki.11-2246.2020.0207