8/14/2023 0 Comments Sketchup house on hill![]() ![]() If the vertical drop from the laser level to the ground downslope is more than three feet, you don’t have to use a yardstick–that was just an example–use a tape measure if you want. You need to be able to locate both the benchmark and the measurement points on your model. In any event, you’ll want to note the measurement point as, say, twenty feet west and fifty-two feet south of the benchmark, or whatever. Or, you could just select a number of points to measure based on how well they describe the terrain, how accessible they are, or other reasons that may strike you as important. In SU, you would construct the grid and measure a vertical height at each grid point. You could divide the area into a grid, say, ten feet by ten feet, and measure the elevation at each grid point. You want to locate a series of points in space that define the ground surface. You can calculate the actual elevations relative to the benchmark back in the office, say, on a spreadsheet, and then plot them in SU. Just note the the yardstick height for each spot in the log. For each location, height of instrument minus the yardstick reading equals the elevation of the location. Now have your assistant stand at each measurement location holding the yard stick on the ground, Shine the laser on the yardstick, and have your assistant read the height of the beam. That’s the height of the instrument–bechmark (elevation 0) plus the distance above ground. ![]() Now once the laser is leveled, note the distance above ground of the laser beam at the benchmark. You might want to number or otherwise label the spots where you will read the elevation so you can record your readings in a log. Now locate various spots around the yard where you’d like to measure the elevation relative to the benchmark, and measure the offsets of these spots say, south and west (or whatever makes sense) from the bechmark so you can plot them to scale. Call the spot where you place the level your benchmark. Set up the level on the highest part of the slope. You can perform a simplified level survey of your yard using an inexpensive laser level (I see a cheap one in Amazon for 12 bucks) and something like a yard stick. If I buy a cheap little protractor, can I do this?Ī protractor is probably the wrong tool. ![]()
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