GPS Surveying GPS -- how it worksGPS -- Garmin 12

The Garmin 12 GPS

Trilateration and a 4th for timing

First page up.4 important pieces of data

Once you have a fix

Getting back to where you started

Non-corrected 5-30 mBeacon-corrected 1 mRadio-corrected cmsPost-processed dm to m GPS Accuracy

Differential GPS for precision surveying of river terraces and alluvial fans

Crash Course in Surveying With an Auto Level:

:((:1First thing first: Gotta level the it

1

1The Auto Level:The InstrumentAnd TripodThe Stadia RodOr Surveyors Staff= l (m) * 100 (m)

How to read the Stadia Rod:11 meters on the dot10.8 meters on the dotEach BlackRectangle =1 cmSame forEach whiteone10.66 meters

What youll see through the eyepiece:Stadia Lines

1For your X-section, be sure to get anyMajor changes in slope

How to collect the data:NOTE: When shooting features off your line, you will also need a bearing

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Side-Scan LiDAR: GeoArcheology

Project North is at the white house, And that is BM1Figure out appropriate scale for x:1 box = 1 meter? 10 meters? You want your entire survey to fit!Same scale as x-axisBM 1BM 2BM 3BM 4PN

Non-corrected = atmospheric delayBeacon = real-time; Radiopersonal beacon with subscription: OmnistarPost-processed: Wait til youre back at the office to use up-to-date corrections from base stations obtained from the internet*Satellite differential: Omnistar; real-time but subscription based (private satellites)*********