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OT distance calculator
I have several lat/long readings from a GPS device in excel.
I need to calculate the distance between points. How? For Latitude, I'm thinking Pi*7900/360*(lat1-lat2) Longitude must need some sort of correction for latitude, not sure how. Once i get lat distance and long distance sqrt(lat**2 +long**2) I need to write this all into excel. Extra credit question. Is there some way to make this into a excel function so you just give it the the two pairs of readings? Karl |
OT distance calculator
On Mon, 17 Dec 2012 18:43:52 -0500, Karl Townsend
wrote: I have several lat/long readings from a GPS device in excel. I need to calculate the distance between points. How? For Latitude, I'm thinking Pi*7900/360*(lat1-lat2) Longitude must need some sort of correction for latitude, not sure how. Once i get lat distance and long distance sqrt(lat**2 +long**2) I need to write this all into excel. Extra credit question. Is there some way to make this into a excel function so you just give it the the two pairs of readings? Karl I cheat by using the line drawing tool in Google Earth. Can also be used to illustrate LOS between two points. (change line altitude parameters) Very cool. |
OT distance calculator
On 12/17/2012 6:04 PM, Spehro Pefhany wrote:
oblate spheroid You are kidding, right? Mean radius 6,371.0 km[6] Equatorial radius 6,378.1 km[7][8] Polar radius 6,356.8 km[9] I'm seeing that as 22 km of "oblative flattening". You'd have to mike it to tell the difference. (BIG micrometer) |
OT distance calculator
On Mon, 17 Dec 2012 20:04:25 -0600, the renowned Richard
wrote: On 12/17/2012 6:04 PM, Spehro Pefhany wrote: oblate spheroid You are kidding, right? Mean radius 6,371.0 km[6] Equatorial radius 6,378.1 km[7][8] Polar radius 6,356.8 km[9] I'm seeing that as 22 km of "oblative flattening". You'd have to mike it to tell the difference. (BIG micrometer) http://en.wikipedia.org/wiki/World_Geodetic_System WGS84 is used by GPS, GLONASS, http://koti.mbnet.fi/jukaukor/greatc...ellipsoid.html This will get you down to the millimeter level, not micrometer. ;-) For example, from Toronto to Chicago is 702.9810543723332 km elliptic, but the spherical solution gives only 700.9181433797103 km. That's an error of more than 2,000 meters.. that could put you on the wrong runway or something. http://www.wtsp.com/news/article/264...rport-in-Tampa Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
OT distance calculator
On Mon, 17 Dec 2012 21:37:34 -0500, Spehro Pefhany wrote:
On Mon, 17 Dec 2012 20:04:25 -0600, the renowned Richard wrote: On 12/17/2012 6:04 PM, Spehro Pefhany wrote: oblate spheroid You are kidding, right? Mean radius 6,371.0 km[6] Equatorial radius 6,378.1 km[7][8] Polar radius 6,356.8 km[9] I'm seeing that as 22 km of "oblative flattening". You'd have to mike it to tell the difference. (BIG micrometer) http://en.wikipedia.org/wiki/World_Geodetic_System WGS84 is used by GPS, GLONASS, http://koti.mbnet.fi/jukaukor/greatc...ellipsoid.html This will get you down to the millimeter level, not micrometer. ;-) For example, from Toronto to Chicago is 702.9810543723332 km elliptic, but the spherical solution gives only 700.9181433797103 km. That's an error of more than 2,000 meters.. that could put you on the wrong runway or something. http://www.wtsp.com/news/article/264...y-plane-lands- at-wrong-airport-in-Tampa Does GLONASS use WGS84 now? I thought they used some commie system. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
OT distance calculator
On Mon, 17 Dec 2012 21:37:34 -0500, Spehro Pefhany
wrote: On Mon, 17 Dec 2012 20:04:25 -0600, the renowned Richard wrote: On 12/17/2012 6:04 PM, Spehro Pefhany wrote: oblate spheroid You are kidding, right? Mean radius 6,371.0 km[6] Equatorial radius 6,378.1 km[7][8] Polar radius 6,356.8 km[9] I'm seeing that as 22 km of "oblative flattening". You'd have to mike it to tell the difference. (BIG micrometer) http://en.wikipedia.org/wiki/World_Geodetic_System WGS84 is used by GPS, GLONASS, http://koti.mbnet.fi/jukaukor/greatc...ellipsoid.html This will get you down to the millimeter level, not micrometer. ;-) For example, from Toronto to Chicago is 702.9810543723332 km elliptic, but the spherical solution gives only 700.9181433797103 km. That's an error of more than 2,000 meters.. that could put you on the wrong runway or something. http://www.wtsp.com/news/article/264...rport-in-Tampa What altitude are you flying at??? Makes a SMALL difference too. Best regards, Spehro Pefhany |
OT distance calculator
On Mon, 17 Dec 2012 18:43:52 -0500, Karl Townsend
wrote: I have several lat/long readings from a GPS device in excel. I need to calculate the distance between points. How? For Latitude, I'm thinking Pi*7900/360*(lat1-lat2) Longitude must need some sort of correction for latitude, not sure how. Once i get lat distance and long distance sqrt(lat**2 +long**2) I need to write this all into excel. Extra credit question. Is there some way to make this into a excel function so you just give it the the two pairs of readings? Karl Try http://www.movable-type.co.uk/scripts/latlong.html -- Cheers, John B. |
OT distance calculator
On 12/17/2012 6:43 PM, Karl Townsend wrote:
I have several lat/long readings from a GPS device in excel. I need to calculate the distance between points. How? For Latitude, I'm thinking Pi*7900/360*(lat1-lat2) Longitude must need some sort of correction for latitude, not sure how. Once i get lat distance and long distance sqrt(lat**2 +long**2) I need to write this all into excel. Extra credit question. Is there some way to make this into a excel function so you just give it the the two pairs of readings? Karl http://www.daftlogic.com/projects-go...calculator.htm -- http://tinyurl.com/My-Official-Response Regards, Joe Agro, Jr. (800) 871-5022 x113 01.908.542.0244 Flagship Site: http://www.Drill-HQ.com Automatic / Pneumatic Drills: http://www.AutoDrill.com Multiple Spindle Drills: http://www.Multi-Drill.com Production Tapping: http://www.Drill-HQ.com/?page_id=226 VIDEOS: http://www.youtube.com/user/AutoDrill FACEBOOK: http://www.facebook.com/AutoDrill TWITTER: http://twitter.com/AutoDrill V8013-R |
OT distance calculator
Spehro Pefhany wrote: wrote: What altitude are you flying at??? Makes a SMALL difference too. A VERY small difference in Florida. Not if you're flying over 'Sugarloaf Mountain'. ;-) |
OT distance calculator
On Dec 17, 4:43*pm, Karl Townsend
wrote: I have several lat/long readings from a GPS device in excel. I need to calculate the distance between points. How? For Latitude, I'm thinking Pi*7900/360*(lat1-lat2) Longitude must need some sort of correction for latitude, not sure how. Once i get lat distance and long distance sqrt(lat**2 +long**2) I need to write this all into excel. Extra credit question. Is there some way to make this into a excel function so you just give it the the two pairs of readings? Karl I've programmed this for checking distances between zip codes using a converison table, there are three formulas depending on what you need for accuracy. Acroos town, the difference between the formulas is like less than a tenth of a mile, it's more significant at longer distances. El cheapo formula: miles1 = Sqr((69.1 * (lat2 - lat1)) ^ 2 + (53# * (long2 - long1)) ^ 2) Second best: miles2 = Sqr((69.1 * (lat2 - lat1)) ^ 2 + (69.1 * (long2 - long1) * Cos(lat1 / 57.3)) ^ 2) What I use: If lat1 lat2 And long1 long2 Then X = (Sin(lat1 / 57.2958) * Sin(lat2 / 57.2958)) + (Cos(lat1 / 57.2958) * Cos(lat2 / 57.2958) * Cos(long2 / 57.2958 - long1 / 57.2958)) Y = Sqr(1 - X ^ 2) miles3 = 3963# * Atn(Y / X) Else miles3 = 0 End If Sensitive to where Lattitude and longitude are equal(same zip codes), hence the check. Also runs a lot longer if you've got thousands of entries to check. From a tutorial out on the web from about 10 years back. HTH Stan |
OT distance calculator
On Mon, 17 Dec 2012 22:19:35 -0600, the renowned Tim Wescott
wrote: On Mon, 17 Dec 2012 21:37:34 -0500, Spehro Pefhany wrote: On Mon, 17 Dec 2012 20:04:25 -0600, the renowned Richard wrote: On 12/17/2012 6:04 PM, Spehro Pefhany wrote: oblate spheroid You are kidding, right? Mean radius 6,371.0 km[6] Equatorial radius 6,378.1 km[7][8] Polar radius 6,356.8 km[9] I'm seeing that as 22 km of "oblative flattening". You'd have to mike it to tell the difference. (BIG micrometer) http://en.wikipedia.org/wiki/World_Geodetic_System WGS84 is used by GPS, GLONASS, http://koti.mbnet.fi/jukaukor/greatc...ellipsoid.html This will get you down to the millimeter level, not micrometer. ;-) For example, from Toronto to Chicago is 702.9810543723332 km elliptic, but the spherical solution gives only 700.9181433797103 km. That's an error of more than 2,000 meters.. that could put you on the wrong runway or something. http://www.wtsp.com/news/article/264...y-plane-lands- at-wrong-airport-in-Tampa Does GLONASS use WGS84 now? I thought they used some commie system. I think you're right- it's apparently actually PZ-90. I might have seen a reciever that does the transformation. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
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