Land Surveyor Forum

Replies

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  Alan Hastings April 3, 2011 at 3:04pm

  150,000Ha.....Aerial photography and Photogrammetry. Nobody would attempt this with any number of teams. Think of a figure, double it, add you age, add to that you lucky number. If you like the look of that figure go with it or double it again.....good luck
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    Brian S. Borum > Alan Hastings April 3, 2013 at 10:43pm

    I agree, fly it.
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  Michael Alan Sanchez August 14, 2010 at 11:45pm

  I wish it was that simple.
  
  the amount of improvements that need to be located can be sparce or dense, and if on can locate and not worry about elevations that would increase production, also using symbols instead of actual measured dimentions, eg a water meter could be a rectangle with "WM" or on can locate the actual corners and draw it up, the symbol is only one shot the other is four.
  
  My rule of thumb used to be after 5 acres, set aerial targets and fly the job, but work being slow, is another matter, I might do up to 14 acres on the ground, but at some point aerial photogrametry is much more cost effective.
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    Chris Root > Michael Alan Sanchez August 15, 2010 at 11:27am

    I don't know that you could use a formula other than one of your own experience. I have always gone out to the job and spent time going over what it would take for me to do the project from beginning to end. I would then buffer that with a few days (or hours if the job is small) for errors, mishaps or anything else that can go wrong. Then figure your manhours, which crew you want to put on the project, each crew seems to have their strengths and weaknesses. Also think of office time, you're going to spend time researching everything. Where are the nearest benchmarks? How long will it take to bring in vertical and horizontal control? How much time will be spent on boundary work in the field and office? How many hours to draft? What is the terrain like? If it is hilly, your topo grid will have to be tighter and there will be more contours to "shoot". If its the unheard of flat and open, you can get away with a wider grid and someone can practically strap on a GPS receiver to a 4 wheeler and drive the topo on continuous topo in no time and have almost no drafting to do. I would say toss the formula out and let your own experienced eyes figure out how many hours of office time and field time it will take and give about a 10%-15% buffer on top of that.
    
    I wouldn't rely on photogramatric topos for accuracy, they're fine for "dirt" elevations, but for paving or concrete or any other hard surface, its not that accurate. Not to mention that the larger the project, the worse any error will be by accumulation. If the entire surface is 0.10' off, 0.10' in elevation over 20 AC will be a lot of volume, 30 AC would be worse. Aerial surveys are also bad in tall grass or any form of vegetation.
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  Rich Maher August 10, 2010 at 2:32am

  150,000 square kilometers is an unfathomable area!
  By capture I assume you mean topographic survey, and without any idea of the terrain or vegetation, I have to assume 4ha is a reasonable assumption (no way to either agree or not).
  Does "pa" mean per annum? Realistically you should use a figure of 260 work days for each year.
  Make that correction and I think you'll reach a imaginative figure for how many surveyors you would need to complete the project in a calendar year.
  
  I have a lot of friends out of work, I could easily find 107 or the new answer (144) if the pay is reasonable.
  
  Take care,
  
  Rich
  
  "The drops of rain make a hole in the stone not by violence but by oft falling." ~ Lucretius