Activity Feed › Discussion Forums › Strictly Surveying › Building layout issues
- Posted by: @brad-ott
@ramses cool. Please share some photos of the sticker placements, the good, the bad, and the ugly. I imagine putting them way up high reaching up to avoid troublemakers from disturbing them, etc??. Are they usually across the street, etc?
I don’t have any pictures of my stickers yet, but I’ll take some next time I put them up. This is the way I do it. I place enough stickers on buildings or poles high enough so that all of them are visible from the middle of the building where I usually set up the instrument for the initial resection based on the surveyor points, and far enough, but still visible, so I can use them once the building structure is up and I need to set up on one side of it. I use 100mm, 60mm, or 40mm stickers and I glue them directly on round concrete or steel poles using an automotive flexible adhesive to prime both the surface and the back of the sticker. On wood poles or tree trunks, I use a precut square piece of plywood slightly larger than the sticker with the sticker pre-glued on it. I then screw, or nail (spiral nails) that piece of plywood to the pole/tree. When gluing them directly on round surfaces I use the smallest size sticker that is still visible, so that the curvature of the support surface won’t affect too much the distance readings. I always do a 2 face reading in reflectorless mode to compensate for the laser misalignment with the centerline of the telescope. I had stickers as far as 320m (1050′) away and I had consistent results resecting from them. I use one of those 14′ long telescopic aluminum ladders to put them up. It is small enough (when collapsed) and light enough to carry it on your shoulder.
The ugly part of using stickers on poles, or trees is that they tend to move with the wind and heat from the sun. Heat shimmer also makes it harder to aim at the center of your target. I try to set up early in the morning when there is no wind and heat shimmer and for the rest of the day I traverse (if I need to move) and I use the same backsight sticker if I can. There is no perfect solution. All we can do is minimize the errors as much as we can.
If that’s the case, then you definitely need someone else making the call. Or if they don’t understand, then you need them getting everyone together to discuss the procedure. Everyone needs to be on the same page.
That said, I don’t know of any reason why two different companies would be contracted to provide layout for the same building. If it’s separate buildings, then there isn’t really an issue, unless there’s something connecting them.
Thanks for all of the replies. Yes I now understand how UTM is derived and although it was a hard lesson to learn I’m glad I was able to dial everything in before any structure was put together. It should have never happend but in the end it was my want to use the network rover to layout concrete piles when sightlines are bad. Since there are multiple buildings going up at the same time, moving the total station around multiple times each day seems frustrating I thought I would seek a way to make things more efficient. Hybrid has been working well as of today and layout I had previously done with the rover ended up being unaffected by the grid/ground swap issue.
@ramses In my experience, it is often stated on the civil sheets, but the A/S/M sheets are another matter, as they use ground distances and are oblivious (rightly so) to the concept anyway. I have often found the situation to be a mix-and-match.
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