As I have discussed here previously (Original post on definitions), there are two major approaches to defining cities and urbanism: the demographic and the functional. Louis Wirth's influential demographic definition uses four features to define cities: permanence, high population, high density, and social diversity or complexity. The alternative functional approach says that any settlement that fulfills urban functions for a hinterland can be called urban. An urban function is an activity or institution in a settlement whose effects extend beyond the settlement. See the original post for more discussion and some references.
|Role of 3 factors in definitions of city and urban|
In a paper I am now revising, my coauthors and I follow a parallel logic. In order to support a larger argument that neighborhoods are universal in human settlements, we examine a group of "semi-urban settlements" to see if they have neighborhoods. (the answer is yes in all cases except disaster camps). I talk about this study in a previous post. Our paper got a judgment of "revise and resubmit" from a journal, and one complaint of the reviewers was that we didn't define the term "semi-urban" very well. So I've been thinking about how these settlements relate to the standard definitions of urbanism. I made up a second triangular graph to help me understand these settlements.
|Two categories of semi-urban settlement in the definition triangle|
Actually, there are two very different kinds of semi-urban settlements, each with different dynamics of change (and different neighborhood processes as well). The first category I call "voluntary camps." These are things like religious camp revival sites, festival sites (like Burning Man), RV camps, and the the various urban "Occupy" campsites from last year. I am fascinated by these settlements, and I am convinced that they can teach us much about cities and urban dynamics. In terms of defining this category, the main traits are that these are limited-purpose settlements, rapidly settled, temporary, and voluntary. On the triangular graph they lie close to the Population corner. They do not have urban functions, and they may or may not have social diversity.
|Japanese-American internment camp|
So, it turns out what one reason we had trouble coming up with a nice succinct definition of "semi-urban settlement" is that this category actually includes two very different types of settlement. But both are urban-like in some ways but not others, and few would be classified as "cities" or "urban settlements" on their own. But they are all part of the Wide Urban World, and they can all teach us much about cities and urban processes.