Presentation on theme: "Defining Spaces: Understanding regions and boundaries"— Presentation transcript:
1 Defining Spaces: Understanding regions and boundaries Delaware Recommended Curriculum Regional Planning CourseAdapted by Maggie Legates, DGA from a presentation by P.W. Rees,UD Department of Geography
2 A region is a basic building block for geography Just as a cell is to biologya concept – a mental construct.
3 Why do people use regions? What uses can you think of?
4 Outline of topics Defining regions Types of regions Defining boundariesWhy are regions useful and important?How do planners use regional analysis
5 To define (or establish) a region Identify places with one or more similar characteristicsCircumscribe (draw a line around) the area of the earth’s surface occupied by those places!
6 And you have made a region! an area of the earth’s surface that contains within it places with one or more similar characteristicsAND is separate from other areas that contain places with different characteristics
18 Other functional regions: Marketing regionsService areas for businessesMetro areasSports teams fan base
19 Types of regionsFormal: defining characteristic is uniform across the entire area of the regionFunctional: defining characteristic is strongest in the center (“core”) and declines in intensity towards the edges (“periphery”)Perceptual – based on personal beliefs – subjective rather than objective
21 Defining boundariesA region cannot exist until its boundaries are defined.Formal regions usually have definitive boundary lines. (What are the advantages and disadvantages of knowing where the line is?)
22 Do mountain peaks make good border markers? How about rivers?Lines of latitude have pros and cons too!
23 Over the years, the Rio Grande has changed frequently. Does this make a good international border?
24 This map of Africa shows two types of boundaries: The red lines show tribal boundaries as they existed before European colonization. The black boundaries are modern national boundaries.What can be the result of many cultural groups within a country?
25 Defining boundariesA region cannot exist until its boundaries are definedFormal regions usually have definitive boundary lines.Functional regions often have boundary zonesCore,Domain,Sphere
27 Defining boundaries Some methods of defining boundaries Identifying the core: orthogonal mediansIdentifying the periphery: Theissen polygons
28 Identifying the core: Finding orthogonal medians Use this method when data is represented in dots.Draw a line across the space at a place where half of the dots are above and half are below the line. Then draw a second line from top to bottom at a place where half of the dots are to the right and and half are left of the line.The core of this region is at the intersection of the lines. The boundary can be established as a line around the outside.
30 Would this be a good way to pick a site for a new national capital?
31 Thiessen polygons- splitting the difference This method is used when locations or data are represented by dots or points.On the dot map, mark a halfway point between each dot and those surrounding it.Then connect the dots! The resulting “regions” look strange, but they mark off the area that should be most convenient for travel to each center.This method does NOT take into account road systems, barriers, or personal preferences.
32 Do large Thiessen areas guarantee a good fan base?
33 On this map, the Thiessen lines are drawn halfway between hospitals . The green circles symbolize populations using the hospitals.Which Delaware hospital serves the least people?
34 Planners must be aware of requirements and boundaries of many types of regions. Consider this map of the public health district of Champaign-Urbana, Illinois!
35 Over lapping regional jurisdictions: City boundariesTownship boundariesFire protection districtsSanitary districtsMass transit districtsSchool districtsGrade school attendance areas
36 Regional analysisUsed in business, government, and non-profit sectors
37 Regional analysis Determining service areas Making comparisons Identifying departures from the normPredicting trendsPlanning for the future
38 Regional analysis Determining service areas Making comparisons Departures from the normAnticipating changePromoting equity; exposing inequality