Topics: Earth, Sun, Oxygen Pages: 7 (766 words) Published: May 6, 2014
Digital Technology
Remote sensing – data collected from aerial photography and satellite imagery. Tem – System of satellites & receivers to plot location. GPS – Global Positioning System – system of satellites & receivers to plot location. GIS – Geographic Information System, - System to manipulate & display spatial data. Electrical lines, gas lines, etc.

Remote Sensing
Aerial Photography
Discern spatial patterns
Resource Inventory
Emergency Management
Sun-Synchronous Satellites: adjust settings to highlight certain items LANDSAT
Geostationary Satellites
GEOES (Weather)
Global Positioning System
24 satellites orbit earth every 12 hours
Satellites transmit pseudo random code
Time of signal to receiver gives distance
Triangulation gives location
Geographic Information System
System for storing, analyzing and manipulating spatially referenced data Data consists of layers of one variable such as: vegetation, landforms, or soils Layers can be overlaid/combined for analysis or display

Application include: resource management, planning, hazard assessment, etc.

Earth-Sun relationship
Most Physical Processes on Earth powered by incoming radiation from Sun. Earth-Sun Relationship Complex – Depends on:
Position of Sun in Sky
Time of Year
Earth’s Rotation/Axial Tilt
Our Place in Space
Big-Bang Theory
Milky Way Galaxy
Our Solar System
Shape of the Earth
Oblate Spheroid
Variation in Sun Angle by Latitude
Subsolar Point
The Sun
About 4.6 Billion Years Old
Average Star, Nothing special
100 times diameter of Earth
Powers most natural processes on Earth
8.3 min. for sun’s energy to reach Earth
Strong Magnetic Fields/Sunspots
The Earth follows an elliptical orbit around the Sun with its closest point at Perihelion and its farthest point at aphelion. The Earth’s Rotation & Axial Tilt
The Earth’s Rotation around its Axis Counterclockwise Rotation around North Pole Moon’s orbit around the earth is also counterclockwise
Global Time
24 Time Zones
Prime Meridian
International Date Line
The Seasons
Earth’s tilt 23.5* from perpendicular to Ecliptic
Angle and Orientation constant in Orbit
Tilt & revolution combine to cause seasons Northern & Southern Hemispheres alternate direct radiation from the Sun Subsolar Point migrates between 23.5*N & 23.5*S The Earth’s orbit and tilt combine to create the seasons. Solstice and Equinox

Spring Equinox (March 20-12)
Subsolar Point – Equator
Summer Solstice (June 20-21)
Subsolar Point – Tropic of Cancer – 23.5* N
Fall Equinox (Sept 22-23)
Subsolar Point – Equator
Winter Solstice (Dec 21-22)
Subsolar Point – Tropic of Capricorn – 23.5* S
Earth-Sun Geometry on Earth
Sun’s Arc across the Sky
Solar Noon
Seasonal Changes in Sun Position
Earth-Sun Geometry on Earth

Chapter 4
The Global Energy System
The Electromagnetic Spectrum and Solar Energy
Microwaves, tv’s, info red lights, phones, etc
Composition of the Atmosphere
The Flow of Radiation on Earth
The Global Radiation Budget
The Electromagnetic Spectrum
Radiation – Electromagnetic (EM) energy transmitted as a wave Wavelength
The entire wavelength range of EM energy
Gamma rays -> X-rays->ultra-violet->infrared->
Shortwave Radiation
Emitted by “hot” objects, i.e. the Sun, 60000C Surface temperature Gamma radiation, X-rays, Ultraviolet, Visible light and Near-infrared Hot objects emit much more radiation than cooler objects
Longwave Radiation
Emitted by “cool” objects, i.e. those on Earth’s surface, even objects hot to the touch, or too hot to touch Avg. temp of Earths surface 16*C
Thermal infrared wavelengths
Earth’s Atmosphere
Medium solar energy passes through
Unique in solar system – provides 0 2 and CO 2 for respiration and photosynthesis Shields Earth from UV radiation
Flows like a liquid with currents and eddies
3 Basic components: constant gases, variable gases, and particulates (snow)...
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