Basic Mapping Processes and Map Projections

Feb 26, 2013

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What is the shape of the earth?. Sphere?From space, the earth looks like a sphereEllipsoid?Centrifugal force cause the equator to bulge and the poles to flatten slightly (polar flattening)Geoid?The earth is lumpy" due to irregularities in the density of earth's crust. . Equatorial radius 6,3

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Basic Mapping Processes and Map Projections

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Map Projections

Map Projections. Every map of the earth has some kind of distortion. It could be distance, shape, size or direction. Mercator. The big flaw is that size and distance near the poles is greatly distorted. It’s old (1500s). Robinson.

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Map Projections and Map Properties

1.06k views • 88 slides

Basic Mapping Processes and Map Projections

457 views • 31 slides

Map Projections

Map Projections. Students must be able to identify and understand the following projections. Mercator Polar Robinson. Mercator Projection. Most Accurate in the tropics from Cancer to Capricorn. Most Distortion at the North and South Poles. Mercator Projection. Used for:

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MAP PROJECTIONS

MAP PROJECTIONS. I. Creating a Map Projection II. Classifying Projections III. Putting Map Projections to Use. Tissot Indicatrix. Tissot Indicatrix. Scale Factor. Scale Factor = actual scale/nominal scale SF = 1.0 would indicate the scale on the projection is the same as the globe.

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Map projections

Map projections . The dilemma. Maps are flat, but the Earth is not!. Producing a perfect map is like peeling an orange and flattening the peel without distorting a map drawn on its surface. For example:. The Public Land Survey System.

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Map Projections

Map Projections. Displaying the earth on 2 dimensional maps. The “World From Space” Projection from ESRI, centered at 72 West and 23 South. This approximates the view of the earth from the sun on the winter solstice at noon in Cambridge, MA. Map projections ….

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Map Projections

Map Projections. An important consideration in mapping our world. Issues and Limitations. Map projections are attempts to portray the surface of the earth or a portion of the earth on a flat surface. Some distortions of different types always result from this process.

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Map Projections

Introduction to GIS. Map Projections. Surprise! It’s not a perfect sphere Earth is an… Oblate spheroid Oblate ellipsoid Geoidal. Earth’s shape. Geographic Coordinate System (GCS). An unprojected coordinate system

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MAP PROJECTIONS

MAP PROJECTIONS. Representing the Earth: Globes. Why is a globe more accurate than a map? A globe is shaped like the Earth and provides a true picture of the size and shape of landmasses and of distances across land masses. Representing the Earth: Maps.

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MAP PROJECTIONS

MAP PROJECTIONS. West wing on the subject. Concerns of map makers:. Distance: the amount of space betw . objects Shape: a form/condition in which something exists Size/Area: a roughly bounded part of space on a surface Direction: the position of one point in relation to another.

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Map Projections

Map Projections. What is a Map P rojection?. A mathematical expression used to represent the 3D surface of the earth on a 2D map Always results in distortions. Source: http ://support.google.com/earth/bin/answer.py?hl=en&answer= 148111. Projection Surfaces. Cylindrical

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Map Projections and Map Terms

Map Projections and Map Terms. What happens when you peel an orange?. Hi……. Please don’t eat me. ……. What happens when you peel the world?. I got this!!!!! Just stretch it out. ………………. Mercator Projection. Greenland is HUGE!!!!!!! . Wow!! North America makes South America look puny. .

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Map Projections

Map Projections. projection – in mapmaking, a way of drawing the round earth on a flat surface. Title page 8 “Map Projections.” Write the term projection and the definition (see the glossary). Map Projections. projection – in mapmaking, a way of drawing the round earth on a flat surface.

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Map Projections

Map Projections. From 3D Globe to 2D Map. As you learned from trying to create your globe, there is no perfect way to take a 3D globe and perfectly turn it into a 2D map. Maps get around the “orange peel problem” by distorting the Earth’s features in one of four ways:

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Map Projections

Map Projections. http://www.mapsofworld.com/projection-maps/miller/world-miller-political-map-text.html. Robinson Projection. Mercator Projection. Aitoff Projection. Eckert V Projection. Miller Projection.

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Map Projections

Map Projections. Tools of Geography. The most useful tool for looking at where things are in the WORLD is a globe It is an accurate, miniature of the actual earth It shows correct distance, size (area), shape, and direction. From Globe to Map.

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Mapping and Projections

Mapping and Projections. Web resources: Geographer’s Craft, Department of Geography, University of Colorado at Boulder - particularly Peter H. Dana’s part http://www.colorado.edu/geography/gcraft/contents.html

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Map Projections and Map Scale

Map Projections and Map Scale. All Maps Lie. Because the world is a sphere and maps are flat, there will always be some degree of distortion. The next several slides will display some of the more popular distortions. Types of Thematic Maps. Dot Maps. Isoline Maps. Choropleth maps.

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Map Projections

Map Projections. GIS-101 Summer 2006 Semester. Important Things to Remember about Map Projections. An attempt to take location information from a spheriod object and transfer to a flat surface As such, ALL projections are a distortion of the real world to some extent!.

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Map Projections and Map Terms

Map Projections and Map Terms. What happens when you peel an orange?. Hi……. Please don’t eat me. ……. What happens when you peel the world?. I got this!!!!! Just stretch it out. ………………. Mercator Projection. Greenland is HUGE!!!!!!!. Wow!! North America makes South America look puny.

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Map projections

Map projections. Reference points. In cartography, it is imperative to take into account the spherical shape of the earth With geodesy we are able to transform the curvature of the earth into a plain surface and place on it geodetic points (references) that

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