Progressive Enhancement 2.0 (jQuery Conference SF Bay Area 2011)
Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.
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Transcript of Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.
![Page 1: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/1.jpg)
Mapping the SF Bay
Overview
![Page 2: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/2.jpg)
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SF Bay: Know the waterways and bridges
![Page 3: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/3.jpg)
Topographic Maps
A. Definition:
A map showing changes in elevation
![Page 4: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/4.jpg)
Contour Line
A. Definition:
A line that connects points of equal elevation.
Contour Interval
A. Definition:
The difference in elevation between two side by side contour lines.
Lines close together represent steep terrain.
![Page 5: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/5.jpg)
Using Contour Lines
What is the contour interval on this map?
Contour interval = Change in elevation ÷ # lines
Go from bank of spillway (blue arrow: 800 ft) to next dark line (green arrow: 1000ft). There are 5 contour lines.
Contour interval = 200 ft ÷ 5 lines = 40 ft
What is the change in elevation from the spillway bank (blue arrow) to the end of the West Fork of Lauguanitas Creek (red arrow)?
Change in elevation = # lines x contour interval
Change in elevation = 24 lines x 40ft
Change in elevation = 960 ft
![Page 6: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/6.jpg)
Map Legend/Key
A. Definition:
Explains what symbols on maps represent
Map Scale
A. Definition:
The ratio between the distances on a map and the actual distances on the surface of the earth
QuickTime™ and a decompressor
are needed to see this picture.In this example, 50 km = 1.8 cm
![Page 7: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/7.jpg)
Using Map Scale
QuickTime™ and a decompressor
are needed to see this picture.
50 km = 1.8 cm
So… area of entire shown map area is…
QuickTime™ and a decompressor
are needed to see this picture.
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Length: 10.6 cm x = =
Width: 3.2 cm x = =
0 11
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50km
1.8cm
€
50km
1.8cm€
530km
1.8
€
160km
1.8
294.4km88.9km
Area = Length x Width
Area = 294.4km x 88.9km
Area =
26,172.16 km2
![Page 8: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/8.jpg)
Nautical Charts
A. Definition:
A map produced for marine navigation.
Water depths are recorded as soundings in feet, meters or fathoms.
![Page 9: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/9.jpg)
Latitude A. Definition:
The distance in degrees North or South of the equator
The lines run parallel to the equator
![Page 10: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/10.jpg)
Longitude
A. Definition:
The distance in degrees East or West of the Prime Meridian
The lines run perpendicular to the equator
![Page 11: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/11.jpg)
Using Lat. And Long.: What is the latitude and longitude of New Orleans?
Answer: 29 degrees 57’ N, 90 degrees 04’ W.
![Page 12: Mapping the SF Bay Overview SF Bay: Know the waterways and bridges.](https://reader036.fdocuments.us/reader036/viewer/2022062323/5697bfe21a28abf838cb451f/html5/thumbnails/12.jpg)
Further consideration: Time Zones