Maps.

Slides:



Advertisements
Similar presentations
How to, kinds of and info on – maps!
Advertisements

Mapping Our World Goals: Differentiate between latitude and longitude.
Models of Earth.
*these notes go on pages 19 AND 21 of your Plate Tectonics INB!!*
Mapping, Topography, and Global Positioning Systems (GPS)
Mapping.
Earth Science – Unit 1.1 Reading Topographic Maps
FIELD METHODS IN ENVIRONMENTAL GEOLOGY LABORATORY GEOS 3110
Chapter 2.
Mapping Earth's Surface Review and Assessment Answers
Maps & Globes Basic map components, types, & projection.
Latitude and Longitude
Finding Locations on Earth 3.1
Section 1: Finding Locations on EarthFinding Locations on Earth
3 Models of Earth 3.1 Modeling the Planet 3.2 Mapmaking and Technology
Mapping Our World Section 2.1.
Chapter 3 Models of Earth.
Finding Locations on Earth Chapter 3. Latitude  Latitude is the angular distance north or south of the equator.  Run parallel to the equator.  Called.
LATITUDE AND LONGITUDE
What is a map? A Map is a two or three-dimensional model or representation of the Earth’s surface. 2-Dimensional map.
Chapter 3 Section 1- Finding Locations on Earth
EQ: How do maps and globes represent the Earth?
Maps as Models of the Earth Chapter 2 AC Earth Science 2009.
Maps Projections of The Earth. Cardinal Directions North, South, East, and West are all Cardinal Directions.
Chapter 6 Views of Earth Sections 2 & 3: Latitude and Longitude and Maps.
We’re gonna learn some Map Skills.
 A. Globe - A scale model of the Earth.  1. Globe vocabulary.
Chapter 2-Maps as Models of the Earth By Samantha Pereira.
CHAPTER NEW CHAPTER Views of Earth Today the BIG idea
MAPPING OUR WORLD. MAPPING Cartography- Cartography- science of map makingscience of map making.
Mapping/Minerals/metamorphic Review. Scale relates to actual distance. Topographic maps and satellite imagery are two- dimensional models that provide.
Geographer’s Tools Maps Globes Graphs. Organization The grid that covers a globe is made of lines that run east to west and north to south. –Lines of.
World Geography Chapter 1: The Tools of Geography.
Mapping. What is a map? It is a representation of something (Earth, stars, solar system, a building, etc… It is a representation of something (Earth,
VOCAB #1 PGS GEOGRAPHY The study of the physical features of the Earth and its atmosphere, and of human activity as it affects and is affected.
Cartography Study of Mapmaking.
Table of Contents Exploring Earth’s Surface Models of Earth Topographic Maps Mapping Earth’s Surface.
FrancisciWG.1. Latitude: Location north or south of the Equator, measured by imaginary lines called parallels numbered in degrees north or south. Parallel.
G 1-2 Models of Earth EQ: How do maps and globes represent the Earth?
Topographic & Geologic Maps Plus: Latitude and Longitude!
EARTH SCIENCE 6 th Grade. The Earth System  System: a group of parts that work together as a whole.  Energy allows Earth to work as a system as it moves.
Global Grid Mapping a 3-dimensional world in 2 dimensions.
How to Read a Map Chapter 2: Maps as Models of the Earth.
How maps and globes represent our Earth?
 Cartography – science of mapmaking  Equator circles Earth halfway between the north and south poles ◦ Separates Earth into 2 equal halves (hemispheres)
What is a map? A Map is a two or three-dimensional model or representation of the Earth’s surface. 2-Dimensional map.
  Cartography  Cartography is the science of mapmaking.  Cartographers use an imaginary grid of parallel lines and vertical lines to locate exact points.
Maps and Map Skills.
Map Skills Notes.
Maps as Models of the Earth
TOPOGRAPHIC MAPS Key Vocabulary:
Mapping.
Chapter 3 Objectives Distinguish between latitude and longitude.
Maps.
1.2 Maps and globes are models of earth
Geography: The Study of Earth
Mapping Earth Science.
Maps and Map Skills.
Models of Earth.
Geography: The Study of Earth
Map Skills Study Guide Answers
Earth Science – Unit 1.1 Reading Topographic Maps
Mapping.
Chapter 2-Mapping our World
Map Skills Study Guide Answers
Mapping the Earth.
Chapter 2-Mapping our World
Modeling the Planet Chapter 3
Models of the Earth Earth Science Chapter 3.
Geography: The Study of Earth
Presentation transcript:

Maps

What is a map? A Map is a two or three-dimensional model or representation of the Earth’s surface. 2-Dimensional map

What is a “Map Projection”? Planar Projection

Projection A Projection is a mathematical means of transferring information from the Earth’s three-dimensional curved surface to a two-dimensional map.

Types of Map Projections All map projections are “flawed” by distortions that are created during “projection”. Different map projections have been developed to reduce this distortion to different areas of the map for different purposes.

Map Distortions Greenland Mercator map size True size of Greenland

Latitude and Longitude Where am I? Early Greeks and Chinese attempted to create a grid system to help them answer this question. But it was not until the Middle Ages that the latitude/longitude system was developed.

Latitude and Longitude Cartographers (mapmakers) have established a set of vertical and horizontal grid lines that cover the globe called: Parallels- Lines of Latitude are horizontal lines on a map that show latitude, positions north and south of the equator. Meridians- Lines of Longitude are vertical lines on a map that show longitude, positions east and west of the prime meridian. Because the Earth is a sphere, each line represents a 1 degree slice of the 360 degrees in a the sphere.

The Earth can be divided into vertical and horizontal halves called Hemispheres.

The Equator-Divides Northern and Southern Hemisphere

The Prime Meridian-Divides Eastern from Western Hemisphere.

Latitude Line “Rules” Run East to West Measure distance in degrees from the Equator Each line forms a circle around the Earth that is vertically equidistant from the equator. Numbered from 0 to 90 Degrees (0 being the equator, and 90 being the poles)

Lines of Longitude Prime Meridian

Longitude Line “Rules” Run North to South Measure distance in degrees from the Prime- Meridian Form half-circles that are equidistant from each other at the Equator, but converge at the poles. 0 Degrees Longitude is at Greenwich, England (established in 1883); 180 Degrees is in the Pacific, and is called the International Date Line (divides the Globe between two days).

The Degree is the basic unit of Latitude and Longitude A general location on the globe would be shown as 45 N. A more precise location on the globe would be 45 15’ 35” N.

How “big” is a Degree? Each degree in Latitude and Longitude is approximately 69 miles “wide” at the equator. Each degree can be divided into 60 subdivisions called minutes (1.15 miles in “width”). 45’ Each minute can be divided into 60 subdivisions called seconds (.019 miles, or 100 feet!). 35” So, your location on the globe can be very precisely identified, and would look like this: 97 35’ 42” W.

Every spot on Earth has an address that is determined by referencing, in degrees, minutes and seconds, the latitude and longitude of that location.

Map Scale Map Scale expresses the relationship between the distance on a map and the true, corresponding distance of the same area of the Earth’s surface. Mapmakers can't draw maps the same size as the area they represent; the maps would be too big. So they draw features smaller than they actually are.

A map scale is usually given as a fraction (1/10000) or a ratio (1:10000) USGS maps contain scales that have the same units on both sides of the ratio. Fractional scale

The larger the number on the right, the greater the amount of land that the map represents.

Bar Scale A bar scale is just a line drawn on a map of known ground length.  There are usually distances marks along the line.  Bar scales allow for quick visual estimation of distance.

Pay attention to where the zero point on the bar actually is when you measure with a bar scale! Notice that 0 is here!

Map Orientation Orientation is determined by Cardinal directions of North, South, East and West. A compass is usually to determine the cardinal directions on the ground. A compass does not normally point to true north. Only in a few places does True North and Magnetic North line up with each other. The direction in which the compass needle points is referred to as Magnetic North, and the angle between magnetic north and true (geographical) north direction is called Magnetic Declination.

Topographic Maps Topographic Maps

A Topographic Map is the representation, normally on a flat surface,of part of the Earth’s surface, drawn to scale.

Topographic maps show distance relationships and elevation. Topography actually means, “the shape, elevation and slope of the land”.

Topographic Maps Different symbols and colors are used to indicate various features on topographic maps, including bodies of water and human-made structures. A topographic map of Portland, Maine shows various physical features of the area.

House Woods Streams Roads Topographic maps also include symbols that represent such features as woods, houses and roads.

One of the main features of topographic maps are contour lines.

How do we know where to put the lines when we make a map???

We could start with an island, and increase the level of the ocean the amount of our contour interval, an marking the shore line as we raise the water level.

10 feet above normal sea-level Notice that the shape of the island changes. Why?

20 feet above normal sea-level

30 feet above normal sea-level

Now, drain the water, and we have our topographic map!

But, how do they do it for real??

Contour Lines are Imaginary lines that join points of equal elevation on the land above or below sea level. All points on this line have an elevation of 250 feet above sea level, for example.

There are several different kinds of contour lines. Index Contour (darker, has elevation) Intermediate Contour (lighter; does not have elevation identified)

Intermediate Contour

Depression Contour Lines Perp. Lines point downhill, into the depression Lip of depression is highest point

280 260 **Edge of depression is between 240-260. 220 240

Ridge Valley Contour Lines make it possible to determine the shape of the land without looking at the actual spot.

Stream Direction Determining stream direction of flow helps the map reader interpret elevations of intermediate contour lines above or below an Index Contour.

Notice V shape of canyon slopes

V’s point uphill. Therefore, line A must be less than 900, and line B must be more than 900

Contour Interval Contour Interval

Total Distance between Index Contours = Number of Spaces between Index Contours =

Slope Steep Slope Gentle Slope

Elevation increase between two identified points/distance between two horizontal points.

Line A Distance = .5 miles Elevation Change = Slope =

Topographic Profiles Topographic Profiles