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From: bad sector <forgetski@_INVALID.net>
Subject: Re: app for precision coordinates
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On 6/23/24 16:34, VanguardLH wrote:
> bad sector <forgetski@_INVALID.net> wrote:
> 
>> On 6/23/24 10:18, knuttle wrote:
>>> On 06/23/2024 9:39 AM, bad sector wrote:
>>>>
>>>> How would I map with precision about 900 planted trees on
>>>> google-earth-pro? As a manual method I would think of taking a hundred
>>>> readings on each with my phone and averaging them out, but that is a
>>>> LOT of work (did it once with a bubble-sextant to win a bet). Is there
>>>> an fdroid app to do this sort of thing (not interested in signupware)?
>>>> Any other ideas?
>>>>
>>> I don't know about the  android version, but on the PC version you can
>>> add pins to identify a specific location.
>>>
>>> On the PC version of Google Earth Pro, you can determine the longitude
>>> and latitude to six decimal places or get good numbers for location
>>> about 300 feet apart.  This 300 feet was calculated by zooming Google
>>> Earth to its maximum and reading the coordinates of each location.
>>
>> About 1/3 of the trees are now just big enough to show on GE but the
>> rest are not visible yet. It is to place THESE that I need the
>> lat-longs. And I'm looking for about one foot of precision :-) which is
>> not easy with the imagery resolution provided out here in the sticks. If
>> I were living in the densely populated areas a six inch seedling would
>> show but all I get is about a 1.5-2.0 foot circle to show.
>>
>> During a drinking marathon I once bet with the owner of a hotel I was
>> staying at that I could measure the width of his hotel with a
>> bubble-sextant to within a foot. So I took like a hundred readings on
>> two corners, plotted them and marked the center of each 'blob'. Won the
>> $200 bet which today would be like $2000. If I were a codepuncher I'd
>> try to write an app that plots for maybe 30 minutes and then coughs up
>> the centerpoint of the same sort of blob as the position.
>>
>> I'll be planting another hundred or so in the next three months so I'd
>> like to refine my mapping. 220 of the trees are yellow-cedars not native
>> here and many fans are watching to see how they will survive. I want to
>> map them on GE and update the pictures from time to time.
> 
> I would think GPS would work to record the locations of the trees.
> While different GPS receivers have varying levels of accuracy, even your
> phone's GPS radio should suffice.  After all, the trees have to be
> planted far enough apart to account for their canopies.
> 
> https://crec.ifas.ufl.edu/media/crecifasufledu/extension/plant-pathology-/greening/pdf/GPSAccuracyforTreeScouting.pdf
> https://fruitgrowersnews.com/article/precise-gps-systems-increase-planting-efficiency/
> 
> Since you are at site when planting the trees, use GPS to record where
> you planted.  Then use the GPS coordinates, or convert to long-lat, to
> position in a map.
> 
> GPS radios in smart phones are accurate to within 3 to 5 meters (1o to
> 16 feet).  Don't know far apart you are planting the seedling to account
> for their canopy sizes later in life.  If a smart phone's GPS isn't
> accurate enough, you can buy GPS receivers that are more accurate.
> 
> I figure if a hand-held GPS navigator is good for recording trails that
> it is probably sufficient to record tree locations.

thanks for the time to respond

I once bought a garmin gps camera attachment for my slr camera but it 
too was wishy washy; never even tried composing blobs with it. With 900 
trees (and growing) the only 'involvement' I have time for is putting 
the smart-phone down and leaving it there to collect its wanderings over 
maybe fifteen minutes or less. The trees are at different distances but 
what I want is 1-foot accuracy not so much because it's indispensible 
but because I'm a sucker for at least a semblance of reality. 
Google-Earth placemarks is one tool I use giving the trees icons 
representing the tree species. Ideally I'd like to attach an actual 
photo of the tree to appear in a popup on click or something along those 
lines and all of it uploaded instead of locally stored.

Not sure if math averaging would give the same result as hitting the 
center of plotted coordinates but with the processing utility in a phone 
an APP could ideally produce the ultimately VERY accurate result ...just 
like I once did with a bubble sextant meant to produce plots in terms of 
miles at the center of triangles of probabilty. That stunt took half an 
hour per reading and I did maybe fifty on each of two corners, I forget 
the actual number, it was a royal pissing contest :-)



-- 
"Only in pursuit of impossible perfection can we achieve excellence" 
...many sources, I heard something like this from Greg Wooldridge, the 
only 3-times lead pilot of the Blue Angels.