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Homeowner Forum / Construction / June 2006What instrument for vertical measurement?
To determine the required height to install microwave radio dishes, I need to find the heights of obstacles along the signal path, including trees. I see that used surveying instruments go for over $500 on ebay, but I only need vertical measurement. I get the horizontal from GPS and USGS topo maps. What's a good instrument for this that doesn't do more or cost more than necessary?  SignatureReply in group, but if emailing add another zero, and remove the last word. > To determine the required height to install microwave radio dishes, I need > to find the heights of obstacles along the signal path, including trees. I > see that used surveying instruments go for over $500 on ebay, but I only > need vertical measurement. I get the horizontal from GPS and USGS topo > maps. What's a good instrument for this that doesn't do more or cost more > than necessary? google "homemade astrolabe" >> To determine the required height to install microwave radio dishes, >> I need to find the heights of obstacles along the signal path, [quoted text clipped - 4 lines] >> > google "homemade astrolabe" You made me realize that I do need horizontal measurement as well, because the astrolabe does no good unless I know my distance from the base of the obstacle. I can use GPS to find my position and the rough position of the obstacle, but I often can't approach very close to it. Something with both a rangefinder and verticle angular measurement would do it, but I don't think a laser rangefinder would reflect well off of a treetop. SignatureReply in group, but if emailing add another zero, and remove the last word. >>> To determine the required height to install microwave radio dishes, >>> I need to find the heights of obstacles along the signal path, [quoted text clipped - 11 lines] >a rangefinder and verticle angular measurement would do it, but I don't >think a laser rangefinder would reflect well off of a treetop. Add a $10 compass to your high tech toolbox. Shoot a bearing from your GPS location to the target from two angles (90° is ideal), triangulate to find the target lat/lon. Or, if you can travel a straight line toward your target, use the course indicator of your GPS. --Andy Asberry recommends NewsGuy-- > Add a $10 compass to your high tech toolbox. Shoot a bearing from your > GPS location to the target from two angles (90° is ideal), triangulate > to find the target lat/lon. Or, if you can travel a straight line > toward your target, use the course indicator of your GPS. Thanks. I'll try that next time I'm out in the field if I don't find anything else by then. SignatureReply in group, but if emailing add another zero, and remove the last word. >>> To determine the required height to install microwave radio >>> dishes, I need to find the heights of obstacles along the [quoted text clipped - 14 lines] > don't think a laser rangefinder would reflect well off of a > treetop. Use the rangefinder to get level distance from your location (GPS not required) to base of object. Use compass/astrolabe/??? to find angle to top of object from location. Simple trig to calculate height. SignaturePhil Scott Ideas are bullet proof. > To determine the required height to install microwave radio > dishes, I need [quoted text clipped - 7 lines] > more or cost more > than necessary? when you find what you need...rent one from an instrument rental company FYI: Signatures go at the BOTTOM of posts!!!! I keep thinking you are posting a blank message! |
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