1. Map Projection Date: Monday September 24 of 2012 Session: 23 Look at the picture on the board and answer: Bell RingerWhat do you think arethe differencesbetween these maps?Talk with your partnerabout the meaning ofProjection0:010:020:030:040:050:060:070:080:090:100:110:120:130:140:150:160:170:180:190:200:210:220:230:240:250:260:270:280:290:300:310:320:330:340:350:360:370:380:390:400:410:420:430:440:450:460:470:480:490:500:510:520:530:540:550:560:570:580:591:001:011:021:031:041:051:061:071:081:091:101:111:121:131:141:151:161:171:181:191:201:211:221:231:241:251:261:271:281:291:301:311:321:331:341:351:361:371:381:391:401:411:421:431:441:451:461:471:481:491:501:511:521:531:541:551:561:571:581:592:00End

2. Objectives Students will learn the different mapprojections. Agenda Bell Ringer Objectives Map making problemsState Standard 8.4.6By the end of eighth Types of projectiongrade,studentsimprove their skills in will Mercator projectionhistorical research andgeographical analysis. Closure 3. WHAT IF YOUR HEAD WOULD BE APLANET What part of yourhead would bewater and whatwould be land? How would you doa map of this newplanet? 4. Map-making problems One of the problemsmap-makers encounteris that the globe is asphere and maps aretwo-dimensional. There are a variety of"projections" used torepresent the globe intwo dimensions. 5. Map projections Project a round globe onto a flat surface Options? Stretch out some areas Cut out some areas Shrink some areas 6. Types of projection (By surface) 7. Cylindricalprojection 8. Conic Projection 9. Plane Projection 10. Interrupted Projection 11. Map projections Three properties to consider Area (equal-area or equivalent) Shape (conformal) Distance (equidistant) Choose two out of three How large an area? Purpose of the map Ulterior motives? 12. Cylindrical Projection MERCATOR The Mercatorprojectionexaggerates areasfar from theequator Alaska takes as much area on the map as Brazil, when Brazils area is nearly 5 times that of Alaska. 13. Notice that areas close to the equator have very little distortion.However, the closer to the poles that one travels, the more distortedthe map 14. http://youtu.be/X4wgFSHZXBg 15. Cylindrical Projection Gall-Peters Useful forpoliticalmaps, itshows thetrue area oflandmasses, choosing instead todistort theirshape 16. Pseudocylindrical map projectionMollweide it sacrifices accuracy of angle and shape infavor of accurate proportions in area 17. Conic Projection A conic projectionmap is created byplacing a coneshaped screen on aglobe. The resultingprojection is moreaccurate than thecylindricalprojection mapdiscussed above. 18. Conic Projection However, thefurther wetravel down themap, the moredistorted andless accuratethe mapbecomes. Itsused by pilots 19. Plane Projection A plane projection iscreated by placing animaginary screendirectly above orbelow a globe. Theimage that wouldresult is called aplane projection.This type of mapprojection is notcommonly used. 20. Interrupted Projection There are many different types of interrupted projectionmaps. These types of maps try to depict the continents asaccurately as possible by leaving blank space in the lessimportant areas of the map, such as in the oceans. 21. Closure http://youtu.be/a6dF7hZpH-A