Locations of craters in a volcanic field in Uganda
A list corresponding to a Venables and Ripley point object with 120 observations
|area||list||bounding box with xl, xu, yl, yu|
|poly||array||polygon boundary with columns x and y|
Tinkler, 1971, - Bailey and Gatrell 1995, ch. 3.
Bailey, T. C. and Gatrell, A. C. 1995, Interactive spatial data analysis. Longman, Harlow.
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