surveying history
DESCRIPTION
SURVEYING HISTORY. Surveying dates back 5000 years China India Babylon Egypt. Egyptians. Pyramids Roads Property and the Nile River Taxation. Ancient Techniques. Ropes and Knots Water Levels Plumb Levels. Ancient Level. Greeks. 250 BC Archimedes wrote the Sand Reckoner - PowerPoint PPT PresentationTRANSCRIPT
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SURVEYING HISTORY
• Surveying dates back 5000 years
China
India
Babylon
Egypt
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Egyptians
–Pyramids
–Roads
–Property and the Nile River
–Taxation
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Ancient Techniques
• Ropes and Knots
• Water Levels
• Plumb Levels
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Ancient Level
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Greeks
• 250 BC Archimedes wrote the Sand Reckoner– Established the circumference of the Earth at 300,000
Stadia
– 1 Stadia = 1/10 of a mile
– 30,000 miles
– Actual circumference = 24,900 miles
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Eratosthenes
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SUN
A LEXA ND R IA
EA R TH
7 .2 °
9 0 °
THE WELL A T SCY ENE
ER ATO STHENES' CA LC ULA TIO N
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7 .2 °
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SUN
A LEXA ND R IA
EA R TH
7 .2 °
9 0 °
THE WELL A T SCY ENE
5 0 0 MILES
7 .2 °=
X MILES
3 6 0 °
ER ATO STHENES' CA LC ULA TIO N
X = 2 5 ,0 0 0 MILES
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Greeks and Romans
• Surveyed for:– Aqueducts
– Roadways
– Military Camps
– Buildings
– Taxation
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Fall of the Roman Empire
• The Dark Ages
• The Age of Enlightenment
• Navigation
• Up until the late 1700’s navigators struggled with the problem of longitude
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Latitude
• Where you are north or south is relatively easy to calculate using a Sextant
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Longitude
• But how do you calculate where you are East and West?
• Time is the key
• It takes 24 hours for the Earth to spin 360°
• 1 hours = 1/24 of a spin
• Or 360/24 = 15°
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Longitude
• At the Equator 15° = 1000 miles
• 1° = 68 miles
• Problem: No reliable clocks existed that could be used at sea.
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Longitude
• King George III of England offered a reward to anyone who could solve the problem of longitude.
• The reward was $15,000,000 to invent a clock that would loose no more than 3 seconds in 24 hours.
• The clock had to find longitude within 1/2°
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Longitude
• 1Hr = 15°
• 1minute = .25°
• 2 minutes = .5°
• At the Equator that would be 34 miles
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Longitude
• Many famous scientists tried to tackle the problem– Sir Isaac Newton– Galileo– Edmond Haley
• John Harrison – a British clockmaker– Invented the Chronometer
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Colonial States Survey
• Colonial States Survey
• Public Land Survey System
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What is Surveying?
• Locating Points on Land
• How do we locate points?– From Land– From Air– From Space
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Types of Surveys
Plane Surveying
• Topographic Survey – Horizontal plane measurements over the surface of the earth, but including indication of changes in elevation.
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Types of Surveys
• Property Survey – Sometimes called boundary or Cadastral survey. These are the most common and oldest type of plane surveying– Locating property lines– Usually required by law
• Route Survey – Surveys along highways, railroads, pipelines and power lines
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Types of Surveys
• Hydrographic Survey are similar to Topographic but used for rivers, lake and other bodies of water.
• Construction Survey – – Used for the purpose of planning a construction
project.– Location and layout of buildings– Controlling the dimensions of a structure as it is being
built– As Built Survey Cover dimensional changes that
occurs during the construction project.
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BREAK TIME
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READING LEGAL DESCRIPTIONS
• Public Land Survey System (PLSS)
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LET’S WRITE A LEGAL DESCRIPTION
NE ¼, NW ¼, Section 21, T2S,R2W P.M. Willamette
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North American Datum (NAD)
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National Geodetic Surveys
• Continuously Operating Reference Stations (CORS)
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CORS BTON
• BTON