Catanserg Posted December 20, 2019 Posted December 20, 2019 (edited) Hello, just a question:Iis waypoint projection down to cm possible? I know the common apps round it up to meters and it is not really necessary for everyday geocaching. It is just a general question. For example I have the coordinate N 45° 28.888 W 100° 01.111 and walk 17.35 meters north, that is 1735 cm. Edited December 20, 2019 by Catanserg Quote
+The A-Team Posted December 20, 2019 Posted December 20, 2019 Yes, there are tools out there that can do this. One that was created by a cacher is FizzyCalc. I recently used it to do a projection using a distance in metres to 6 decimal places (micrometres). HHL showed that GSAK can do it, and I also use this US National Geodetic Survey tool sometimes (though it's less friendly to use than FizzyCalc). Quote
+HHL Posted December 20, 2019 Posted December 20, 2019 (edited) Here's a nice online tool: https://www.geocachingtoolbox.com/index.php?lang=en&page=coordinateProjection Hans Edited December 20, 2019 by HHL Added link Quote
+colleda Posted December 21, 2019 Posted December 21, 2019 This luddite needs help in understanding in what situation/s this can be useful or is it just academic discussion? Quote
+HHL Posted December 21, 2019 Posted December 21, 2019 8 hours ago, colleda said: This luddite needs help in understanding in what situation/s this can be useful or is it just academic discussion? Reread the first post more carefully and you will know. Quote just a question [...] it is not really necessary for everyday geocaching. It is just a general question. Happy Learning Hans Quote
+arisoft Posted December 21, 2019 Posted December 21, 2019 9 hours ago, colleda said: This luddite needs help in understanding in what situation/s this can be useful or is it just academic discussion? Try high-D mystery caches. Some may require micrometer resolution. 1 Quote
+colleda Posted December 21, 2019 Posted December 21, 2019 1 hour ago, HHL said: Reread the first post more carefully and you will know. Happy Learning Hans Thanks Hans. My mind got tied up from overthinking the question. Quote
+colleda Posted December 21, 2019 Posted December 21, 2019 21 minutes ago, arisoft said: Try high-D mystery caches. Some may require micrometer resolution. Thanks arisoft. I have trouble enough with D2 mysteries. Some day I may progress. Math was my favourite subject in school but I wasn't real good at it though I loved solving quadratic equations. Quote
+arisoft Posted December 21, 2019 Posted December 21, 2019 1 hour ago, colleda said: I loved solving quadratic equations. In Geocaching we need to solve spheroidic equations, in practice, you need a set of tools for iterative calculations. Here is an example https://coord.info/GC15000 Quote
+colleda Posted December 21, 2019 Posted December 21, 2019 16 minutes ago, arisoft said: In Geocaching we need to solve spheroidic equations, in practice, you need a set of tools for iterative calculations. Here is an example https://coord.info/GC15000 Whoa! Way above my pay scale. I kinda got the spheroidic stuff but the example cache had me staring blankly at the screen interspersed with Finnish Google translations. I was quite chuffed that I recognised it was Finnish even though I don't know any Finnish words. I was in Finland last year, but only in transit for a couple of hours, flying from Japan to Budapest. Quote
+arisoft Posted December 21, 2019 Posted December 21, 2019 54 minutes ago, colleda said: Whoa! Way above my pay scale. I kinda got the spheroidic stuff but the example cache had me staring blankly at the screen interspersed with Finnish Google translations. I was quite chuffed that I recognised it was Finnish even though I don't know any Finnish words. I was in Finland last year, but only in transit for a couple of hours, flying from Japan to Budapest. The description is written in english. Did you forget to shut down your automatic Google translator? Quote
gpsblake Posted December 22, 2019 Posted December 22, 2019 On 12/20/2019 at 4:18 PM, Catanserg said: Hello, just a question:Iis waypoint projection down to cm possible? I know the common apps round it up to meters and it is not really necessary for everyday geocaching. It is just a general question. For example I have the coordinate N 45° 28.888 W 100° 01.111 and walk 17.35 meters north, that is 1735 cm. Negative. Because the N XX XX.xxx format can not be within a centimeter of being accurate on it's own, it would have to be N XX XX.xxxxxx (6 digits) format to start with to have centimeter accuracy. Example N 45° 28.888 W 100° 01.111 to N 45° 28.889 W 100° 01.112 is about 2 meters or 200 centimeters. N 45 28.8885 would be about 100 centimeters from N 45 28.888 .... Quote
+arisoft Posted December 22, 2019 Posted December 22, 2019 6 hours ago, gpsblake said: Negative. Because the N XX XX.xxx format can not be within a centimeter of being accurate on it's own Not so fast. In many cases the distance and bearing will project exactly to the milliminute grid which is used as an implied geochecker. Quote
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