The grease content in the walnut showed an linear connection, and increased gradually with the latitude moving from the equator to north.
就地理空间对脂肪含量的影响来看，纬度是最重要的因子，它与纬度成一线性关系，随着纬度的向北移，脂肪含量逐渐增高；
When working with data in geographic coordinates, this is a problem because the linear distance of a degree of latitude varies.
这样在处理地理坐标下的数据的时候就出现问题，原因是水平距离单位为经纬度。
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