1 / 7

Stadia markings + rod

Stadia markings + rod. stadia hairs define a known vertical angle horiz. distance = 100x vertical less accurate than taping but faster. Both: Principles of Surveying. 2nd ed. C. A. Herubin, 1978. Electronic Distance Measurement. Optical: uses parallax. Inexpensive but error ≥ 1%

melaney
Télécharger la présentation

Stadia markings + rod

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stadia markings + rod • stadia hairs define a known vertical angle • horiz. distance = 100x vertical • less accurate than taping but faster Both: Principles of Surveying. 2nd ed. C. A. Herubin, 1978 CS 128/ES 228 - Lecture 10a

  2. Electronic Distance Measurement • Optical: uses parallax. Inexpensive but error ≥ 1% • Ultrasonic: mid-priced.Accuracy ~ 0.1% • Laser: moderate to very expensive. Accuracy 1 ppt or better CS 128/ES 228 - Lecture 10a

  3. Measuring elevations • Known as “leveling” • Uses a level (optical or laser) & a rod • All measurements are relative (to a starting elevation) • Height of instrument Both: Elements of Surveying. U. S. Army, TM 5-232, 1971 CS 128/ES 228 - Lecture 10a

  4. Optical vs. laser leveling • Optical leveling requires 2 workers • Laser leveling can be done alone, but easiest when rod is equipped with autodetector (high/low/on signals) Top: Principles of Surveying. 2nd ed. C. A. Herubin, 1978Bottom: Topcon web site CS 128/ES 228 - Lecture 10a

  5. Putting it together Two ways of mapping a region: • Traversing – used to locate specific features • Triangulation – used to establish a control network over a region Both: Elements of Surveying. U. S. Army, TM 5-232, 1971 CS 128/ES 228 - Lecture 10a

  6. Types of traverses Allowable “misclosure” • First order, Class I:- 4 mm in 1 km- 127 mm in 1000 km • Third order:- 12 mm in 1 km- 380 mm in 1000 km • Land surveys: ??? Both: Elements of Surveying. U. S. Army, TM 5-232, 1971 CS 128/ES 228 - Lecture 10a

  7. The total station • Combines theodolite, EDM, data logger & surveying software • Log ~ 8000 points, download data to computer • Why doesn’t ES have one??? CS 128/ES 228 - Lecture 10a Topcon web site

More Related