Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Wed, 26 Jun 2024 01:33:06 +0000 Date: Tue, 25 Jun 2024 21:33:06 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: =?UTF-8?B?YmFk8J+SvXNlY3Rvcg==?= Subject: Re: app for precision coordinates Newsgroups: comp.mobile.android References: <1ib29f50d2bbn.dlg@v.nguard.lh> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Message-ID: Lines: 145 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-0U69iSxiZH4ysGbXmChzM3AtCvR/maKBgQSww+FN2XvB6BbzDPx7EsmBCCktR4LWnAWApGS7ToDKdih!omACN1s+PS1rhv+jNCk9PBVQHxORV9gBVHl5GZJwsUpmxWYSfrc7m1eh3PopkNbiUG64OiGczgqk X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 8762 On 6/25/24 19:59, bad💽sector wrote: > On 6/24/24 13:27, VanguardLH wrote: >> bad sector wrote: >> >>> On 6/23/24 16:34, VanguardLH wrote: >>>> bad sector 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 :-) >> >> I think averaging would only work well if you managed to get the GPS >> device connected to different GPS satellites within reach.  Then repeat >> by using another different set of 3 GPS satellites.  I would think >> reusing the same 3 GPS satellites to get multiple readings from them >> would result in the same offset (inaccuracy) in each reading.  However, >> maybe walking around in a circle around the focus point to take multiple >> readings might work to average the multiple readings from the same set >> of 3 satellites. >> >> Someone here mentioned DGPS (differential GPS) which uses ground-based >> positioning stations.  Those have a 200-mile range if there are no >> blocks to the signal (mountains, trees, buildings).  Never got around to >> using those, so no experience with them.  Don't remember seeing a smart >> phone stating it can use DGPS, so you'll likely have to find a GPS >> receiver that can find DGPS stations. > > I launch the F-Droid app *GPSTest* which tunes in a long list of > satellites. > > https://f-droid.org/en/packages/com.android.gpstest.osmdroid/ > > > I have no idea how it arrives at the annunciated Lat-Long but it's > changing continuously and what I have in mind is an automated way of > virtually plotting these positions over a few minutes and picking the > plot-centerpoint as THE position. I haven't tried any of the math yet to > get a feel for those 7 decimal readouts and what they mean in terms of > feet but I figure that there must be some added precision to squeeze out > of THEM as opposed to just any ONE of them. > Not to confuse precision with accuracy, the 6th decimal Lat is good for 10cm precision and the 7th for 1cm (both the the 6th and 7th are wondering up to 3 units so that 3 on the 6th counter is a variation of 30cm or about a good foot). *Accuracy* could come from averaging out the time-lapse plot maybe. The good news is that I'm no GPS guru and as far as smart-phones go I haven't even come up for air yet. And out of courtesy to those trying to help out here's a screenshot of what I'm trying to do (in this case using GE 'placemarks'). https://imgur.com/7VQlUul.png