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Why Maps Can you use a square globe?Could you fold up a globe and put it in your pocket? Why do we need maps? What types are there?
Map Makers Cartography: map makingDevelop a way to put a curved surface onto a flat surface (Map Projection) Mercator Gnomonic Conic Are the most common projections
Mercator Projection Wrap a cylinder around a globe.Meridians appear straight. This creates distortion near the poles where the meridians normally come together.
Mercator Projection Compass directions appear as straight linesLatitude & Longitude are shown clearly and easily measured with a ruler. Shapes are shown correctly.
Gnomonic Projection Imagine a sheet of paper touching a globe at one point (tangent) Little distortion occurs at the point of contact. It is usually the poles.
Gnomonic Projection There is a great distortion in both directions from the point of contact. Used in navigation of great circle routes Great circle appears as a straight line on these maps.
Conic Projection Cone placed over a globe so that the axis of the cone is aligned with the axis of the globe. Cone touches the globe along one parallel.
Conic Projection The area near the contacted latitude has the least distortion. Good for studying a specific area.
Polyconic Projection Placing many conic map projections together can give you a continuous map. The relative shape and size of small areas are the same as the globe.
Earth Science Mr. Bimber
Mapping Our World Goals: Differentiate between latitude and longitude.
Models of Earth.
Globes and Maps A globe is a scale model of the Earth that presents the most accurate depiction of geographic information such as area, distance, and direction.
Map Projections An important consideration in mapping our world.
Map Projections. Georegistered ? Representing a curved surface in a flat plane Locating that plane on the earth 3 issues –sphere –datum –projection.
Map Projections Introduction © 2005, Austin Troy.
Objectives Vocabulary Compare and contrast different map projections.
Types of Maps Mercator Projections Conic Projections
Modern technology has changed the way we view and map Earth.
Maps and Globes.
Models of the Earth.
Introduksi © 2005, Austin Troy.
Methods of presenting the curved surface of the Earth on a flat map.
Latitude and Longitude
HOW TO READ A MAP …. LIKE A PRO
A model or representation of the Earth’s surface
Definitions html://egsc.usgs.gov/isb/pubs/MapProjections/projections.html Azimuth —The angle measured in degrees between a base line radiating from a center.
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