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The boundary problem occurs with regard not only to horizontal boundaries but also to vertically drawn boundaries according to delineations of heights or depths (Pineda 1993). For example, biodiversity such as the density of species of plants and animals is high near the surface, so if the identically divided height or depth is used as a spatial unit, it is more likely to find fewer number of the plant and animal species as the height or depth increases.
[https://web.archive.org/web/20111004212256/http://lh5.ggpht.com/_fHD7C68ZqPM/S-VBeClLMcI/AAAAAAAAARc/Fg3kytstuUg/s640/BP.jpg '''Boundary problem''': urban sprawl in central Florida (an evaluation by land cover analysis with raster datasets vs. an evaluation by population density bounded in the census tract)]<br />
<sup>Notes: Land cover datasets were obtained from USGS and population density from FGDL.</sup>
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