2. Remote Sensing and Earth Science .pptx

Remote sening

1. Essential Questions What are some of the different types of remote sensing? How are satellites and sonar used to map Earth’s surface and its oceans? What is the Global Positioning System and how does it work? Copyright © McGraw-Hill Education Remote Sensing

2. Review satellite New remote sensing Landsat satellite sonar Global Positioning System Geographic Information System Copyright © McGraw-Hill Education Vocabulary Remote Sensing

3. Chapter 2 Section 3

4. How are satellites and sonar used to map Earth’s surface and its oceans ?

5. What is the Global Positioning System?

6. 6 Remote Sensing Brief History For GISc . remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance Remote sensing started in 1840’s but was not recognized until WW1 and WW2 Multiple Sensors and Application LIDAR, RADAR, Multispectral Hyperspectral….

7. The Electromagnetic Spectrum

8. Types of Sensers Active Passive

9. Remote Sensing Copyright © McGraw-Hill Education Landsat Satellite The process of gathering data about Earth using instruments mounted on satellites, airplanes, or ships is called remote sensing . Landsat satellites record reflected wavelengths of visible light and infrared radiation from Earth’s surface, and then computers convert the information into digital images. Landsat data are used to study pollution, the movements of Earth’s plates, and the melting of glaciers and ice caps. Passive

10. Western Australia This enhanced image of Western Australia resembles a mixture of crayons that melted in the sun. The yellow sand dunes of the Great Sandy Desert cover the upper right portion of the image. Red splotches indicate burned areas from grass and forest fires, and the colors in the rest of the image depict different types of surface geology.

11. N orthern Canada The copper color in this infrared combination is the presence of lake ice in the Northwest Territories in northern Canada. The lake on the right side is Whitefish Lake, in a region with numerous glacial landforms. Bright wrinkle-like lines are eskers, ridges made of sand and gravel formed by glacial sediments deposited by meltwater rivers flowing on the ice. The blue color is land dominated by shrub tundra with some spruce stands.

12. Lake Disappointment Surrounded by sand dunes, Lake Disappointment is an ephemeral salt lake in one of the most remote areas of Western Australia. An early explorer supposedly named the lake in 1897 after following several creeks that he thought would lead to a large lake; they did, but the lake's extremely salty water was not drinkable.

13. Copyright © McGraw-Hill Education Remote Sensing OSTM/Jason-2 Satellite One satellite that uses radar to measure and map sea surface height is the OSTM/Jason-2 satellite. Radar uses high-frequency signals that are transmitted from the satellite to the surface of the ocean. A receiving device then picks up the returning echo as it is reflected off the water. (Ocean Surface Topography Mission: OSTM

14. Copyright © McGraw-Hill Education Remote Sensing OSTM/Jason-2 Satellite Using OSTM/Jason-2 data, scientists are able to estimate global sea levels with an accuracy of just a few millimeters. Scientists can use this data combined with other existing data to create maps of ocean-floor features.

15. Copyright © McGraw-Hill Education Remote Sensing SeaBeam Sonar is the use of sound waves to detect and measure objects underwater. SeaBeam technology uses sonar to map the ocean floor from a ship.

16. Copyright © McGraw-Hill Education Remote Sensing SeaBeam A sound wave is sent from a ship toward the ocean floor. A receiving device picks up the returning echo when it bounces off the seafloor. A computer calculates the distance from the ship to the ocean floor using the speed of sound in water and the time it takes for the sound to be reflected. SeaBeam technology is used by fishing fleets, deep-sea drilling operations, oceanographers, volcanologists, and archaeologists .

17. Copyright © McGraw-Hill Education Remote Sensing The Global Positioning System The Global Positioning System (GPS) is a satellite navigation system that allows users to locate their approximate position on Earth. These satellites can also relay information to a GPS receiver about elevation, direction of movement, and speed.

18. Copyright © McGraw-Hill Education Remote Sensing The Global Positioning System Uses for GPS technology GPS technology is used extensively in navigation by airplanes and ships. GPS receivers also help people in everyday life to find a destination or determine their current location.

19. Copyright © McGraw-Hill Education Remote Sensing The Global Positioning System Visualizing GPS Satellites GPS receivers detect signals from the 24 31 GPS satellites orbiting Earth. Using signals from at least three satellites, the receiver can calculate location within 3- 20 m.

20. Copyright © McGraw-Hill Education The Geographic Information System The Geographic Information System (GIS) uses a worldwide database to create layers, or “themes,” of information that can be placed one on top of the other to create a comprehensive map. GIS map layers remain linked to the original information, so if the original information changes, the GIS layers also change. The result is a map that is always up-to-date. Remote Sensing

21. What fields can it be used in? Mapping Irrigation Water Management Dairy Industry Planning and Community Development Assets Management and Maintenance Geology Surveying Taxation Banking Natural Resources Management Flood damage estimation Navigation Disaster Management and Mitigation Agricultural Applications Environmental Impact Analysis Transportation Planning Urban planning Accident Analysis and Hot Spot Analysis Telecom and Network Services Pest Control and Management

22. Homework Unit Quiz Online Friday till next Wednesday Worksheet Read Chapter 3 Section 1 & 2 Before You Leave!! Hand in 1. Groups Lab Report 2. Two person map 3. Weekly reflections

23. Copyright © McGraw-Hill Education Review Essential Questions What are some of the different types of remote sensing? How are satellites and sonar used to map Earth’s surface and its oceans? What is the Global Positioning System and how does it work? Vocabulary remote sensing Landsat satellite sonar Remote Sensing Global Positioning System Geographic Information System