1. Quiz next class Bell Ringer What is the latitude of a
Agenda
*If you missed the test last class, you need to see me.
*Bearing and Waypoints
*Contour mapping practice
Quiz next class
Today's Workbook pages
A/pgs 58, R/pgs 68,70-72
Research Class: Journal article #2 due 9/29. Get started!
September 18-19, 2017
Bell Ringer
What is the latitude of a
point halfway between
the North Pole and the
Equator?
On a map, what defines the
symbols?
On what type of map are
latitude and longitude lines
perpendicular to each other?

2. Describe: Lines of longitude and latitude are at right angles to
Mercator projection
Describe: Lines of longitude and
latitude are at right angles to
each other
Strength: All the countries are on
one map, directions are
easy to see
Weakness: All areas away from the
the equator are distorted
Gnomonic projection
Describe: map projection obtained by
projecting points on the surface of sphere
from a sphere's center to point in a plane
Strength: show all great circles as straight lines,
the shortest route between 2 places.
Weakness: need multiple maps to see the
entire world

3. Polyconic Projection
Small size maps of a limited area, called quadrangle maps, made by placing a piece of paper shaped like a cone on to the globe and mapping parts that touch the paper.
Describe:
Strength:
Weakness:
Very accurate, can be very detailed.
Only covers a small area, you need multiple maps to go very far.

4. Meridians/ Longitude lines 0-180 degrees
indicate distance in degrees east or west of the Prime Meridian
Parallels/ Latitude lines degrees
indicate distance in degrees north or south of the Equator
1 degree = 6o minutes 1 minute = 60 seconds
Reference points/lines
Greenwich, England- Prime Meridian 0 degrees E or W longitude
North Pole- 90 degrees North latitude
South Pole- 90 degrees South latitude

5. Very accurate and usually very detailed.
Mercator Projection
Description:
Advantages:
Disadvantages
Very accurate and usually very detailed.
Takes a lot of maps to cover much area
Latitude lines are perpendicular to longitude lines
Circular area is projected onto a flat plane
True directions shown, whole world on one map
Gnomic Projection
Description:
Advantages:
Disadvantages
Shows true directions and shortest distances as straight lines
Sizes and shapes of land masses are distorted the further you go from the center point.
Sizes & shapes of lands/oceans exaggerated as distance gets further from equator
Polyconic Projection
Description:
Advantages:
Disadvantages
Small area map, cone of paper is laid on globe & portion that touches cone is mapped

6. Waypoints are used to store and remember locations that are of interest to the user.
Bearing is the direction to the destination or target.

7. 2. What is the measure of the angle Y you drew?
How do I do this?
X1. Start from north line at X, going in a clockwise direction, draw a curve line joining Y and X
2. What is the measure of the angle Y you drew?
180° is the measure of the angle.
That was the easy one.
For X to Y, since going from the North line at X to Y is a clockwise direction, you are going to need to do some math!

9. Measure the angle. Make sure you have 3 digits
015°

10. 048
140
240
290

11. line on a map connecting point of equal elevation.
every 5th contour, bold line, labeled with elevation
difference in elevation between 2 consecutive contour lines
lines that indicate a decrease in elevation,
have hachures
Contour lines never cross one another
When contour line cross a stream, river or creek, they
form a V that points upstream
The first depression contour repeats the value of the previous downhill contour line.

15. Next class: Making a topo map

16. Ocean elevation 0 meters – Contour interval 10 m Making a topo map10 20 30 30 20 10 30 30 20 20 10 10