Great Circles Map Projections

Jan 20, 2026

110 likes | 226 Vues

Discover the significance of Great Circles in map projections and navigation. This article delves into how Great Circles represent the shortest distance between two points on the Earth's surface, making them essential for air and sea travel. We explore various map projection techniques that illustrate Great Circles, their mathematical foundations, and practical applications in modern navigation systems. Learn how understanding Great Circles can enhance your geographic knowledge and improve route planning for travel and exploration.

Share Presentation

Embed Code

sanaa

Télécharger la présentation

Great Circles Map Projections

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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.

575 views • 9 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:

611 views • 19 slides

Map Projections

Map Projections. Geographic coordinates can be translated into planar coordinates using formulae taking the general form: x = f ( f,l) y = g ( f,l) For example, the formulae for the Mercator projection are: x = l y = ln tan ( f/2 + p/4)

691 views • 33 slides

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.

574 views • 29 slides

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.

506 views • 29 slides

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 ….

995 views • 21 slides

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.

555 views • 21 slides

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

657 views • 49 slides

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.

672 views • 15 slides

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.

331 views • 11 slides

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

488 views • 28 slides

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.

227 views • 9 slides

Map Projections

Map Projections. Three Basic Categories of map projections are: Planar Projection Cylindrical Projection Conic Projection. Planar surface. Earth intersects the plane on a small circle. All points on circle have no scale distortion. Cylindrical surface. Earth intersects the

362 views • 13 slides

Map Projections

Map Projections. Methods of presenting the curved surface of the Earth on a flat map. Are all Maps created equally? . Distortion results from trying to make a spherical object flat. Mercator Projection. Meridians are stretched apart and parallel to each other instead of meeting at the poles.

381 views • 15 slides

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:

379 views • 15 slides

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.

442 views • 6 slides

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.

493 views • 27 slides

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!.

580 views • 31 slides

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

273 views • 11 slides

Map Projections

Map Projections. Georegistered ?. Representing a curved surface in a flat plane Locating that plane on the earth 3 issues sphere datum projection. Sphere & Datum. Mathematically describe a sphere. Lock it down by making it touch the earth somewhere NAD27- Kansas.

513 views • 30 slides

Map Projections

Map Projections. Map Projections Putting a sphere on a flat surface messes up certain realities: Distance Direction Shape Area Each map keeps one or two things true (pros), but the others are not accurate (cons). Mercator Pros : Direction Cons : Shape Distance Area

899 views • 24 slides

Map Projections

Map Projections. RG 620 April 20, 2016 Institute of Space Technology, Karachi. Converting the 3D Model to 2D Plane. Map Projection. Map Projection. Map Projection Projecting Earth's Surface into a Plane. Earth is 3-D object

1.47k views • 44 slides

More Related