本文介绍了在特定数据库中插入2D坐标数据时的有效值范围，当坐标值超出[-179, -179]至[180, 180]区间时将触发错误。通过两个实例演示了超出范围的坐标无法被正确插入。
# 2d默认取值范围[-179,-179]到[180,180] 包含这两个点，超出范围将报错
> db.mapinfo.insert({"category" : "bank","name" : "china people bank","loc" : [181,181]})
point not in range
> db.mapinfo.insert({"category" : "bank","name" : "china people bank","loc" : [-179,-180]})
> db.mapinfo.insert({"category" : "bank","name" : "china people bank","loc" : [181,181]})
point not in range
> db.mapinfo.insert({"category" : "bank","name" : "china people bank","loc" : [-179,-180]})
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