RE: longitude / latitude distance calculations

Actually it is to be used to determine 'exclusive' territories....
example... a particular customer has exclusive rights to products within a
200 mile radius... well, since we have a trucking company we know each
customer's longitude and latitude.   So the problem becomes how do I do
that.... if a customer calls in to place an order for an item, and that item
is exclusive to another customer for the 200 mile radius... can the customer
purchase? Is he inside or outside exclusive territory? And the data I have
to determine this is longitude and latitude...   And if he is within the
exclusive area, the user would get an error stating, 'exclusive'...
otherwise, the order would be allowed to go thru... lol... programming can
get complicated at times, but I have been doing it for 22 years, and can
honestly say, I still love it!  

Karen Brasier
I.T. Department - Software Analyst
Standard Furniture Manufacturing Co.
Bay Minette, Alabama 36507
(251) 937-6741 ext 8848
There are 10 kinds of people in the world, those that understand binary and
those that do not.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of jstevens@xxxxxxxxxxxxxx
Sent: Wednesday, January 12, 2005 1:44 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: longitude / latitude distance calculations

Karen,

I did an application just like this about 12 years ago.  I had the 
database of cities and their lat/lon location, and needed the miles 
between them.  I actually did it in RPG II back then.  If I remember, the 
hardest part was writing my own sin, cos, sqrt, tan, and arc-tan functions 
with only +/-*.   I would assume that those functions are available in the 
C binding library now.

Is this for a transportation application?

Are you really trying to get to highway miles, or is straight line, 
surface miles good enough?



Jeff Stevens
Mize, Houser & Co. P.A.
913 451 1882
JStevens@xxxxxxxxxxxxxx





"Karen Brasier" <karen.brasier@xxxxxxxxx> 
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
01/12/2005 01:23 PM
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Subject
longitude / latitude distance calculations






Working on a project and need to know the distance in miles between two
locations.  The information that I have in the file to use to do this is 
the
longitude and latitude.  I have seen the code in PC jargon, but have not
been able to find anything about how to accomplish this in RPG.    Any
suggestions would be appreciated... I am cutting/pasting the calc to
accomplish this below...    as I look at this, I am lost! (or worse, lol)
surely, there is an easier way, but in searching the archives, I found
nothing on this... 



const pi = 3.14159265358979323846

Function distance(lat1, lon1, lat2, lon2, unit)
  Dim theta, dist
  theta = lon1 - lon2
  dist = sin(deg2rad(lat1)) * sin(deg2rad(lat2)) + cos(deg2rad(lat1)) *
cos(deg2rad(lat2)) * cos(deg2rad(theta))
  response.write "dist = " & dist & "<br>"
  dist = acos(dist)
  dist = rad2deg(dist)
  response.write "dist = " & dist & "<br>"
  distance = dist * 60 * 1.1515
  Select Case ucase(unit)
    Case "k"
      distance = distance * 1.609344
    Case "n"
      distance = distance * 0.8684
  End Select
End Function 


'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
':::  this function get the arccos function using arctan function   :::
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Function acos(rad)
  If abs(rad) <> 1 Then
    acos = pi/2 - atn(rad / sqr(1 - rad * rad))
  ElseIf rad = -1 Then
    acos = pi
  End If
End function


'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
':::  this function converts decimal degrees to radians             :::
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Function deg2rad(deg)
                 deg2rad = cdbl(deg * pi / 180)
End Function

'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
':::  this function converts radians to decimal degrees             :::
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Function rad2deg(rad)
                 rad2deg = cdbl(rad * 180 / pi)
End Function

msgbox(distance(32.9697, -96.80322, 29.46786, -98.53506, "m") & "
miles<br>")
msgbox(distance(32.9697, -96.80322, 29.46786, -98.53506, "k") & "
kilometers<br>")
msgbox(distance(32.9697, -96.80322, 29.46786, -98.53506, "n") & " nautical
miles<br>")

Karen Brasier
I.T. Department - Software Analyst
Standard Furniture Manufacturing Co.
Bay Minette, Alabama 36507
(251) 937-6741 ext 8848
There are 10 kinds of people in the world, those that understand binary 
and
those that do not.



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