- show topography or using elevation contour lines topic: topographic maps
TRANSCRIPT
- show topography or using
elevationcontour lines
Topic: Topographic Maps
1. Contour line : connects pts of = elevation.
2. Contour interval : difference in elevation b/w 2 adjacent contour lines.
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Parts: of a Topographic Map
Contour Interval Example
• http://www.learnearthscience.com/pages/For_Teachers/Unit%20Notes/measuringearth/measuringearth.pdf
3. Index contour lines : darker, marked w/ elevation.
http://www.k4lrg.org/Field_Day/2005/Topo_Map_K4LRG-FD_Site.png
4. Spot elevation (x): indicates highest point
5. Benchmark (BM): point of known elevation
Hachures indicate depression, hole, basin
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RAP 9/11 pg. 14When you are done—study for your quiz!
**Put your homework on your desk**1
What is the contour interval of the map above?
What is the elevation of the contour line? **Hint- This is an island**
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Write the definition of a contour interval.
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Topographic Features
• Hill
• Valley
• River
• Depression
• Volcano
Contour lines V upstream. In other words, the *stream flows into the point, out of arms.
Identify a hilltop (H), stream (S) and valley (V) on this
topographic map.
http://www.k4lrg.org/Field_Day/2005/Topo_Map_K4LRG-FD_Site.png
Challenge: Draw an arrow in the direction the river is flowing!
More About Topo Maps
Topographic Profiles
• Matching
RAP 9/12
1. What direction does the
stream flow in?2. What is the
contour interval?3. What is a
depression or basin (what would it look like)?
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Green River Topographic Map Activity
Select the most accurate profile that runs from A to A` from the choices.
Practice!
• http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=493
Remote Sensing
•process of collecting data from far above Earth’s surface (using satellites, airplanes or ships)
Aerial Photographypictures taken from the air
Used for espionage, movie production, etc.
Satellite Imagerypictures taken from artificial satellites in space
Used for warfare, forestry, intelligence, etc.
Satellite or Aerial?
Landsat images courtesy of NASA at http://www.nasa.gov/vision/earth/lookingatearth/Landsat_Tsunami.html
Before the tsunami: 13 December 2004
After the tsunami: 29 December 2004
Landsat images of a region of the Aceh Peninsula on the Indonesian island of
Sumatra
GPS Navigation
Triangulation
Receiver must be receiving signals from at least three
satellites.
The above images are courtesy of Kathryn Keranen, GIS/GPS
Remote Sensing Consultant
GPS tracking and data transmission via GPRS or CDMA 2000
at http://www.cybergraphy.com/Engl ish/gtrack.htm
Exit Pass: Put your name on a scrap piece of paper. Write down numbers 1-
5 on piece of scrap paper.
• http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=471