MI Calculating distance between to lat and long points
Hello Does anyone know the formula or method for calculating the distance in miles between to latitude/longitude points. The projection is NAD 83. Either a formula or a MI solution would be acceptable. Thanks, Lisa Cloutier Metricom, Houston -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
Re: MI Calculating distance between to lat and long points
Lisa: Try. Javascript: http://www.best.com/~williams/gccalc.htm Formulas: http://forum.swarthmore.edu/dr.math/problems/longandlat.html - David Ward www.earthwardconsulting.com www.towermaps.com Lisa Cloutier wrote: Hello Does anyone know the formula or method for calculating the distance in miles between to latitude/longitude points. The projection is NAD 83. Either a formula or a MI solution would be acceptable. Thanks, Lisa Cloutier Metricom, Houston -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
FW: MI Calculating distance between to lat and long points
-Original Message- From: Russell Mincher [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 23, 2000 12:04 PM To: Lisa Cloutier Subject: Re: MI Calculating distance between to lat and long points Back in '97 Dan Phillips gave following formula in response to a similar question, I believe it gives the answer in statute miles but it would pay to check. I do recall modifying it to give me the answer in metres, I still use it and it works very well. The coordinate pairs are in decimal degrees. distance=69.093 *acos(sin(lat1*.01745329252)*sin(lat2*.01745329252)+(cos(lat1*.01745329252)* cos ((lat2*.01745329252))*cos((lon2*.01745329252)-(lon1*.01745329252*57.295 77951) (Where lat1 and lon1 are the first coordiante pair and lat2 and lon2 are the second coordinate pair) This replaced my initial method which was very tedious but did utilise MI and I provide because it may have more use in your application: Every year I receive the start and end positions of up to 500 dredge tows during a biomass survey together with all of the results of data regarding what comes up in the dredge. I then provide the scientist analysing the data with exact tow lengths so that the data can be standardised. I received the coordinates in an excel spreadsheet. I used to export the data as a text file and work up each pair as a line in a MIF. (line Lon1 Lat1 Lon2 Lat2) I would then import the MIF Create a new field (column) in the table and populate it with Update TABLE set NEWCOLUMN = objectlen(obj,"m") (remember I am working in metres) Then I would export the table back into excel so that I could use the lengths calculated by MI You can see why Dan's contribution was such a help to me, I could do the whole thing in excel which was the format I received the data and had to produce my results in. I would be very interested in any alternative methods / responses you receive Regards Russ Mincher - Original Message - From: Lisa Cloutier [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, February 24, 2000 5:06 AM Subject: MI Calculating distance between to lat and long points Hello Does anyone know the formula or method for calculating the distance in miles between to latitude/longitude points. The projection is NAD 83. Either a formula or a MI solution would be acceptable. Thanks, Lisa Cloutier Metricom, Houston -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
RE: MI Calculating distance between to lat and long points
Sometime last year we posted a short writeup explaining how to create a simple dealer locator online. The VB source (and a .dll) for calculating great circle distance is available there at: http://www.directionsmag.com/devel/devel_articles.asp?ID=1 Hope this helps... Rob Martinson - Original Message - From: Lisa Cloutier [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, February 24, 2000 5:06 AM Subject: MI Calculating distance between to lat and long points Hello Does anyone know the formula or method for calculating the distance in miles between to latitude/longitude points. The projection is NAD 83. Either a formula or a MI solution would be acceptable. Thanks, Lisa Cloutier Metricom, Houston -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
Re: MI Calculating Distance
This is a little application I wrote to do this exact thing. It has table and colum names hardcoded in it, so you may have to do a bit of tailoring (this one finds the nearest doctor for each specialty per given patient). Also, you need a lattitude and longitude for each customer... Include "mapbasic.def" Dim TempDist, MinDist as float Dim Specialty as String Dim CurDistCol, CurMember, FirstDoctor as Integer Open Table "E:\Generation Health\GeoDoctors" interactive Open Table "E:\Generation Health\GeoMembers" interactive Fetch first from GeoDoctors 'Chiro=26, Derm=66, Ent=85, hosp=101, neuro=110, ob-gyn=127 Fetch first from GeoMembers FirstDoctor=127 Do while not EOT(GeoMembers) CurMember=GeoMembers.RowId Fetch rec FirstDoctor from GeoDoctors Specialty=GeoDoctors.specialty Print(Specialty+" member #"+CurMember+" First Doctor="+FirstDoctor) MinDist=Distance(GeoMembers.long, GeoMembers.lat, GeoDoctors.long, GeoDoctors.lat, "mi") Do Fetch next from GeoDoctors TempDist=Distance(GeoMembers.long, GeoMembers.lat, GeoDoctors.long, GeoDoctors.lat, "mi") if TempDistMinDist then MinDist=TempDist end if Loop While GeoDoctors.specialty=Specialty and Not EOT(GeoDoctors) Update GeoMembers Set OBGYN=MinDist where RowId=CurMember Fetch next from GeoMembers Loop Gary Talbott wrote: I have a database of about 2000 +- customer accounts, and another database of all our service locations. I need to know the nearest service location for each of these customers. Is there a mapbasic program out there that will calculate the distance and then sort the table from near to far from each particular service location. Or at least some thing close. I have experimented with the 3.0 bundle of object distance, I need a little more than that. From, Gary Talbott [EMAIL PROTECTED] HAVE A GREAT DAY ! ___ Get Free Email and Do More On The Web. Visit http://www.msn.com -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
MI Calculating Distance
I have a database of about 2000 +- customer accounts, and another database of all our service locations. I need to know the nearest service location for each of these customers. Is there a mapbasic program out there that will calculate the distance and then sort the table from near to far from each particular service location. Or at least some thing close. I have experimented with the 3.0 bundle of object distance, I need a little more than that. From, Gary Talbott [EMAIL PROTECTED] HAVE A GREAT DAY ! ___ Get Free Email and Do More On The Web. Visit http://www.msn.com -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
