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Distance Calculator using Longitude/Latitude

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    Distance Calculator using Longitude/Latitude

    Hi Chaps,
    I need to build in to my A5a6 application a dialog Distance Calculator using longitude and latitude coordinates.

    A user will enter two Cities/Towns from a drop down selection field (from the same Continent) and the selection returns the Miles and Kilometres (a field for each)

    Has anybody had experience in working out the distance between Two points using the Great Circle Distances (as the crow flies) � if yes I need your help!

    I have a table prepared with Long/Lat details � just need a kick in the right direction so to speak�

    Regards
    Andy

    #2
    RE: Distance Calculator using Longitude/Latitude

    you should try contacting Ira Perlow. You should be able to seach for the message board for his email. I believe that he has done something like this.

    Comment


      #3
      RE: Distance Calculator using Longitude/Latitude

      If you search the archives at the Ask Dr Math forum (http://mathforum.org/dr.math/), you should find several different formulas that can be used to calculate the distance.

      -Lenny

      Lenny Forziati
      Vice President, Internet Products and Technical Services
      Alpha Software Corporation

      Comment


        #4
        RE: Distance Calculator using Longitude/Latitude

        Thanks Both,


        I know the Excel formulas - its the Alpha side I need the help with!!!

        Northern/Western Hems
        =RadiusEarth*ACOS(COS(RADIANS(90-(Lat1*24)))*COS(RADIAN(90-(Lat2*24)))+ SIN(RADIANS(90-(Lat1*24)))*SIN(RADIANS(90-(Lat2*24)))* COS(RADIANS(24*(Long1-Long2))))

        Eastern/Southern Hems
        =RadiusEarth*ACOS(COS(RADIANS(90-Lat1))*COS(RADIANS(90-Lat2))+SIN(RADIANS(90-Lat1))*SIN(RADIANS(90-Lat2))*COS(RADIANS(Long1-Long2)))

        I'll check out both your suggestions.
        Regards
        Andy

        Comment


          #5
          RE: Distance Calculator using Longitude/Latitude

          Your Excel formula is very close to the Xbasic you'll need. Take a look at the Xbasic functions acos(), cos(), dtor() and sin()

          Lenny Forziati
          Vice President, Internet Products and Technical Services
          Alpha Software Corporation

          Comment


            #6
            RE: Distance Calculator using Longitude/Latitude

            Dr. Peter Wayne has code for this on his web site. I'm sorry, I don't have his web address at this time.

            I modified his code to call up an xdialog box so the user could enter airport's and get the great circle distance between them.

            Ron
            Alpha 5 Version 11
            AA Build 2999, Build 4269, Current Build
            DBF's and MySql
            Desktop, Web on the Desktop and WEB

            Ron Anusiewicz

            Comment


              #7
              RE: Distance Calculator using Longitude/Latitude

              OK,

              Very late reply, but thought I'd post anyway for the sake of the archive.

              lat1=latitude of point a
              lon1=longitude of point a
              lat2=latitude of point b
              lon2=longitude of point b

              (3958*3.1415926*sqrt((lat2-lat1)*(lat2-lat1) + cos(lat2/57.29578)*cos(lat1/57.29578)*(lon2-lon1)*(lon2-lon1))/180)

              Two things you need to know:
              1) All coordinates are expressed as decimals. If you have the coordinates in degrees, minutes, and seconds, you'll need to convert.

              Here's how:
              decimal equivalent = degrees+(minutes/60)+(seconds/3600)

              2) The answer is in miles. If you need it in KM, change the 3958 to 6378

              As you may have guessed this number represents the radius of the earth.

              Also - if you need data for major US cities, try:
              http://www.realestate3d.com/gps/uslatlongdegmin.htm


              I haven't played with the one from Dr. Peter Wayne, yet. http://www.learn alpha.com/GreatCircle/GreatCircle.htm

              But it takes it a step further and uses ZIP codes to get the longitudes and latitiudes.






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