误差模型包络线是GIS位置不确定性研究的重要内容，是GIS可视化研究的关键指标。
How to ascertain boundary envelop of error model is not only of the importance for GIS uncertainty theory, but also the critical index for GIS uncertainty visualization research.
布林线技术指标和移动平均包络线相同，但是不同是外部布林线是怎样创建的。
A Bollinger band technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created.
布林线技术指标和移动平均包络线相同，但是不同是外部布林线是怎样创建的。
A Bollinger band technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created.
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