| What Do We Need to Get Pi? |
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| q | We need to know rij and rgi in
order to solve the N linear |
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| equation for the N Ps. |
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| è But we don’t data at grid points (can not calculated |
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| rgi !). |
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| q | It is typical to assume that correlations between points |
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| depend only on the distance between them and not on |
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| location or direction. |
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| q | So we calculate the rij from station data and
obtain rgi from |
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| rij based on the distance between the grid points and the |
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| stations. |
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