Compass  Transit

Compass Transit PowerPoint PPT Presentation


  • 96 Views
  • Uploaded on
  • Presentation posted in: General

Download Presentation

Compass Transit

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


2. Final and Quiz summary. Practical and Lecture.Final and Quiz summary. Practical and Lecture.

3. Field books Legal records of work done Data and field calcs only - Calcs for this course No erasing, no removal of pages Pencil – 2 to 4 H. HB not so good. Old book still used – Princes & WestminsterField books Legal records of work done Data and field calcs only - Calcs for this course No erasing, no removal of pages Pencil – 2 to 4 H. HB not so good. Old book still used – Princes & Westminster

4. compass costs vary from the cheap $10 to the $50 mirror compass The sunto bearing compass at $150 To the Transit & Compass combination. compass costs vary from the cheap $10 to the $50 mirror compass The sunto bearing compass at $150 To the Transit & Compass combination.

5. Use the ElephantUse the Elephant

6. True north is the spin axis of the planet, it moves but very slowly Mag north is dependant on the iron core of the planet and how it interacts with the solar radiation.True north is the spin axis of the planet, it moves but very slowly Mag north is dependant on the iron core of the planet and how it interacts with the solar radiation.

7. Declination is the variation from mag north to true north Mag north moves From 1620 to the present its track is varied Even on a daily basis it will move up to 85km.Declination is the variation from mag north to true north Mag north moves From 1620 to the present its track is varied Even on a daily basis it will move up to 85km.

8. Grid north is when a mapping system will impose a flat grid on the geoid. Near the edges the grid and true north will depart. Local north is not truly correct. For some projects the X,Y grid will not be truly North-South , East-West but my follow some local feature that makes calculations or layout easier. For many of my projects I will assume a bearing to start with and coordinates of 1000, 5000, 100 to start with to simplified the initial calculations then rotate and translate the system to the control net once it is tied in.Grid north is when a mapping system will impose a flat grid on the geoid. Near the edges the grid and true north will depart. Local north is not truly correct. For some projects the X,Y grid will not be truly North-South , East-West but my follow some local feature that makes calculations or layout easier. For many of my projects I will assume a bearing to start with and coordinates of 1000, 5000, 100 to start with to simplified the initial calculations then rotate and translate the system to the control net once it is tied in.

9. Good for general directions, but it lacks divisibility.Good for general directions, but it lacks divisibility.

11. Azimuths and Bearings are sometimes used interchangeably. 360 degrees per circle, 60 min per degree, 3600 sec per degree. Use the HMS function to convert to decimal and back. Using the rule of similar triangles you can find the error at a given distance to find an appropriate level of readings required.Azimuths and Bearings are sometimes used interchangeably. 360 degrees per circle, 60 min per degree, 3600 sec per degree. Use the HMS function to convert to decimal and back. Using the rule of similar triangles you can find the error at a given distance to find an appropriate level of readings required.

13. Typical transit. The Wild T2 Scope, Vertical circle in housing, tribrac. Optical trains shown.Typical transit. The Wild T2 Scope, Vertical circle in housing, tribrac. Optical trains shown.

14. Two primary angles Horizontal HA or HZ Vertical VA or VTwo primary angles Horizontal HA or HZ Vertical VA or V

17. Show Error theory.Show Error theory.

23. Show overheads. Show overheads.

30. Elementary Surveying 118$US from Amazon.com Survey Theory and Practice 97$US from Amazon.com Schaum's Outline of Introductory Surveying (Schaum's)Elementary Surveying 118$US from Amazon.com Survey Theory and Practice 97$US from Amazon.com Schaum's Outline of Introductory Surveying (Schaum's)

  • Login