You can look up benchmark locations by visiting sites like https://www. geocaching. com/mark/. [1] X Research source If you can’t find a benchmark location, you can measure from a distinct land feature, such as a large tree or building, instead.
Almost all tripods come with a built-in bubble level. You can use this to assess whether or not the tripod is level. To measure the area properly, make sure you set up in a spot that’s slightly higher than your benchmark location.
If the dumpy level wobbles when tapped, tighten the leveling screws to better secure the device.
For the best results, turn the screws with an even amount of force and pressure. You’ll typically find the bubble level either on top of or below the device’s telescope.
Vintage dumpy levels often have 4 leveling screws instead of 3. If this is the case for your device, adjust the second pair of screws just like you adjusted the first pair.
If the bubble is not centered in any of the 3 positions, repeat the leveling process until it is.
If your lens is dirty, wipe it down with a pre-moistened lens wipe. You can find these at most camera stores and a number of big-box stores.
When finished, your crosshairs should appear dark, sharp, and easily noticeable.
If you’re having trouble focusing, ask a friend or colleague to hold an E staff near the benchmark spot. This metered measuring stick will give you an easy object to focus on.
For the most accurate measurements, have your friend rock the staff forwards and backwards and record the lowest number you read. Most E staffs collapse to save space, so make sure you extend your staff before taking any measurements. Use a fiberglass staff instead of a metal version if you’re taking measurements in an area beneath power lines.
This measurement is known as your backsight. Each numbered section of your staff represents 10 cm (3. 9 in). Within these sections, every block indicates 1 cm (0. 39 in) and every E indicates 5 cm (2. 0 in).
Record this measurement so you can use it to find the height of your next spot.
This measurement is known as your foresight. If necessary, adjust your eyepiece’s focusing knob until you can see the staff. If the spot is too high or far away for you to measure, move your staff to a lower, closer spot first. Find the height of this new spot, then move your dumpy level to it and restart the measuring process.
When your record this height, make sure to include a thorough description or diagram of the spot you measured. That way, if you return to the area, you’ll be able to find the measured spot easily.
