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MIGDIST5
Distance between counties, 5 years
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Description

MIGDIST5 is a constructed variable that reports the distance, in miles, between counties of residence, for inter-county migrants for whom place of residence five years ago was ascertained.

The calculated distance in MIGDIST5 is the number of miles between the counties' 1970 centers of population. The latitude and longitude of the points were used in the following formula:

MIGDIST5 = 69.055 * ACOS [(SIN(LATA) * SIN(LATB)) + (COS(LATA) * COS(LATB) * COS(LONA - LONB))]
where:

LATA = latitude of 1935 county
LONA= longitude of 1935 county
LATB = latitude of 1940 county
LONB = longitude of 1940 county