Stadia Reduction

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines.

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. The middle line is used for levelling

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. The other 2 lines are stadia lines

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Stadia lines are used to measure distances.

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Note – These measured distances are not intended to be used for setting out. They should be used for measurement for detail surveys. Stadia lines are used to measure distances.

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Top 3.040

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Top 3.040 Bottom 2.947

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Top 3.040 Bottom 2.947

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Top 3.040 Middle 2.993 Bottom 2.947

Stadia Reduction When you sight the through the telescope on most instruments you will see 3 horizontal lines. Top 3.040 Difference Top & Bottom = 0.093 Check Difference Top & Middle = 0.047 Difference Middle & Bottom = 0.046 Add difference 0.047 + 0.046 = 0.094 Middle 2.993 Bottom 2.947

Stadia Reduction Most instruments have a stadia constant of 100, you should check the documentation. Top 3.040 Difference = 0.093 Bottom 2.947

Stadia Reduction Most instruments have a stadia constant of 100, you should check the documentation. Top 3.040 Distance = 0.093 x Stadia Constant Distance = 0.093 x 100 = 9.400m Bottom 2.947

Stadia Reduction Top __________ Middle _______ Bottom _______

Stadia Reduction Top 2.043 Middle 1.958 Bottom 1.871

Put Stadia to Work Set up the instrument Measure the position in relation to known features

Put Stadia to Work Set a zero point for the horizontal circle e.g. measure horizontal distance to boundary

Take back sight as normal & book readings

Putting Stadia to work

Putting Stadia to work

Putting Stadia to work

Putting Stadia to work

Stadia Determine reduced levels of your spot heights

Stadia Draw to scale site plan & instrument position

Stadia Draw in Azimuth

Stadia Draw in Observations

Stadia Draw in Observations

Stadia Draw in Observations

Stadia Draw in Observations