Automated Numeric Placement for Land Utilization Map Based on Rule Database and Grid Algorithm
Yujun Liu · Acta Geodaetica et Cartographica Sinica · 2008
Automated placement helps greatly improve the efficiency of cartography.Annotation of map can be divided into name,numeric,illustrative annotation.Almost all researches care about name placement.But numeric annotation has some difference from name,which for example is of fixed length and must be fetched from field value of background feature and so on.According to the character of numeric annotation of land utilization map,rule database is proposed,with which the program can be configured dynamically.And a new Grid Algorithm for region automated placement is put forward which can solve the conflict of overlap between labels,and be applied to program more easily and efficiently.Furthermore,down-lead label of little parcel,update of numeric annotation together with its related parcel,are also discussed.Based on this rule database and grid algorithm,an application of automated numeric placement for land utilization map is developed,which is proved to be effective for above 95 percent of parcels in utilization map.