horizontal_angles - CIVL04C03 Lecture 4 Horizontal and...

Info icon This preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
In partnership with Horizontal Angles CIVL04C03 Lecture 4: Horizontal and Vertical Angles (using the theodolite) Keith Miller
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 Horizontal Angles Objectives o Types of instrument: o Theodolites and Total Stations o Instrument errors: o Instrument tests o Observing methods used to minimise errors in observations o Angle measurements in control surveys. o Which is followed up in Surveying (2) o Angle measurements for detail surveys o Measuring angles towards production of a survey plan
Image of page 2
Lecture 4 Horizontal Angles - Instruments Introduction Part 1 Types of Instrument o Optical Theodolite o Electronic Theodolite o Total Station
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 Horizontal Angles - Instruments Objectives o The theodolite is used for accurate angular measurement. While they all rely on optics, they are classified into two types: Optical, where readings are provided on a scale. Electronic, where readings are provided digitally on a screen. o The Total Station combines the electronic theodolite with electronic distance measurement.
Image of page 4
Lecture 4 0.2” Optical Theodolite Horizontal Angles - Instruments The Wild T3, a 0.2” instrument. The reading shows 73 ˚ 25’ 59.6” The lines in the top display are a Vernier that must be aligned before reading.
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 1” Optical Theodolite Horizontal Angles Instruments The Wild T2, a 1” instrument. The reading shows 94 ˚ 12’ 44” The lines in the top display are a Vernier that must be aligned before reading.
Image of page 6
Lecture 4 Components of the Optical Theodolite Plumb the instrument over a survey mark. Read horizontal directions and vertical angles are read from two graduated glass circles. Natural light illuminates the circles. Horizontal Angles Instruments
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 Electronic Theodolite Horizontal Angles Instruments The electronic theodolite provides readings digitally.
Image of page 8
Lecture 4 Total Station The total station is an electronic theodolite, but also has a means of measuring distances electronically. Horizontal Angles Instruments
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 Portability Horizontal Angles Instruments
Image of page 10
Use in this Module o At this stage we will not be using total stations or electronic means of measuring distance. o For practical work we will be using electronic total stations that measure horizontal and vertical angles only. o We will use traditional methods for measuring distance, and this will be covered later. Lecture 4 Horizontal Angles - Instruments Today we will discuss the theodolite, and the its application in measuring horizontal angles.
Image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 4 Horizontal Angles - Observing Introduction Part 2 Observing Procedures o Instrument Errors o Instrument Tests o Observing and Booking
Image of page 12
Sources of Instrument Error o Instrument is not level.
Image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern