Moreover, every time that land use has changed, surveying and mapping has gotten that much harder. Thus, for example, where farmland has been rezoned for construction, it has often been sold off to several different owners, dividing the land up into ever smaller lots.
此外，每當土地用途更動，例如農地改為建地後，往往分割給不同地主，土地越分越細，測量繪圖的工作也越複雜。