Book Review Landscape of Migration: Mobility and Environmental Change on Bolivia’s Tropical Frontier, 1952 to the Present. By Ben Nobbs-Thiessen. Chapel Hill: University North Carolina Press, 2020, p. 342

We show how to construct interlocked collections of simple polygons in the plane that fall apart upon removing certain combinations of pieces. Precisely, interiordisjoint simple planar polygons are interlocked if no subset can be separated arbitrarily far from the rest, moving each polygon as a rigid object as in a slidingblock puzzle. Removing a subset S of these polygons might keep them inter...

Accurate spatial distribution information of rainfall is essential to rainfall-induced hazard predictions and statistical interpolation methods may serve as a useful tool produce detailed from coarse data sources. Although numerous comparison studies about different have been conducted on irregular rain-gauge networks, there need perform such work the increasingly available gridded data. Carrie...

When rainfall spatially varies, complete rainfall data for each region with different rainfall characteristics are very important. Numerous interpolation methods have been developed for estimating unknown spatial characteristics. However, no interpolation method is suitable for all circumstances. In this study, several methods, including the arithmetic average method, the Thiessen Polygons meth...

Gang set space is defined as ‘‘the actual area within the neighborhood where gang members come together as a gang’’ (Tita, Cohen, and Engberg 2005:280). The current article examines one subarea of gang set space: where gangs maintain street corner-centered open-air drug markets. Two types of corners—corner markets dominated by one gang and corner markets with multiple gangs—were contrasted with...

We have produced extended series for two-dimensional prudent polygons, based on a transfer matrix algorithm of complexity O(n), for a series of length n. We have extended the definition to three dimensions and produced series expansions for both prudent walks and polygons in three dimensions. For prudent polygons in two dimensions we find the growth constant to be smaller than that for the corr...

This paper introduces the geometric continuity equations of the closed planar polygons and gives the definition of a morphing with geometric continuity between two arbitrary planar polygons, including simple, non-3 and even degenerated polygons. A simple morphing technique based on linear interpolation of the geometric continuity equations is proposed. The closureness of the in-between polygons...