Presentation on theme: "Defining Spaces: Understanding regions and boundaries"— Presentation transcript:
1Defining 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
2A region is a basic building block for geography Just as a cell is to biologya concept – a mental construct.
3Why do people use regions? What uses can you think of?
4Outline of topics Defining regions Types of regions Defining boundariesWhy are regions useful and important?How do planners use regional analysis
5To 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!
6And 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
18Other functional regions: Marketing regionsService areas for businessesMetro areasSports teams fan base
19Types 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
21Defining 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?)
22Do mountain peaks make good border markers? How about rivers?Lines of latitude have pros and cons too!
23Over the years, the Rio Grande has changed frequently. Does this make a good international border?
24This 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?
25Defining boundariesA region cannot exist until its boundaries are definedFormal regions usually have definitive boundary lines.Functional regions often have boundary zonesCore,Domain,Sphere
27Defining boundaries Some methods of defining boundaries Identifying the core: orthogonal mediansIdentifying the periphery: Theissen polygons
28Identifying 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.
30Would this be a good way to pick a site for a new national capital?
31Thiessen 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.
32Do large Thiessen areas guarantee a good fan base?
33On 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?
34Planners must be aware of requirements and boundaries of many types of regions. Consider this map of the public health district of Champaign-Urbana, Illinois!
35Over lapping regional jurisdictions: City boundariesTownship boundariesFire protection districtsSanitary districtsMass transit districtsSchool districtsGrade school attendance areas
36Regional analysisUsed in business, government, and non-profit sectors
37Regional analysis Determining service areas Making comparisons Identifying departures from the normPredicting trendsPlanning for the future
38Regional analysis Determining service areas Making comparisons Departures from the normAnticipating changePromoting equity; exposing inequality