Improve company productivity with a Business Account.Sign Up

x
?
Solved

VB.net form for converting DMS to Decimal Degrees

Posted on 2013-05-21
5
Medium Priority
?
693 Views
Last Modified: 2013-05-22
I'm trying to create a simple form to convert degrees minutes seconds to decimal degrees, but I'm having trouble when converting negative numbers.  When I try to convert -92 7 6.52 I get -91.8815222 but the answer should be -92.118478.  Why is this simple formula not working?
Private Sub btnDecimal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDecimal.Click

        'txtLatDecimal.Text = Math.Round(CInt(txtLatDegrees.Text) + (CInt(txtLatMin.Text) / 60) + (CDec(txtLatSec.Text) / 3600), 7)

        'txtLngDecimal.Text = Math.Round(CInt(txtLngDegrees.Text) + (CInt(txtLngMin.Text) / 60) + (CDec(txtLngSec.Text) / 3600), 7)

        txtLatDecimal.Text = Math.Round(((CDec(txtLatSec.Text) / 60) + CInt(txtLatMin.Text)) / 60 + CInt(txtLatDegrees.Text), 7)
        txtLngDecimal.Text = Math.Round(((CDec(txtLngSec.Text) / 60) + CInt(txtLngMin.Text)) / 60 + CInt(txtLngDegrees.Text), 7)

    End Sub

Open in new window

0
Comment
Question by:Nate_LR
  • 3
5 Comments
 
LVL 23

Expert Comment

by:Ioannis Paraskevopoulos
ID: 39185999
Hi,

You are adding positive numbers to negative, so the result is closer to zero:
6.52/60+7/60-92 results to -91.8815222.

Giannis
0
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 39187105
You need to determine the sign of txtLngDegrees.Text and then apply that sign to the other parts of your formula. Thus your formula would become

-6.52/60 - 7/60 - 92 = -92.118478

AW
0
 
LVL 44

Accepted Solution

by:
Arthur_Wood earned 2000 total points
ID: 39187249
try this:

Dim signLng as Integer = CInt(txtLngDegrees.Text)/Abs(CInt(txtLngDegrees.Text))
Dim signLat  as Integer = CInt(txtLatDegrees.Text)/Abs(Cint(txtLatDegrees.Text))

        txtLatDecimal.Text = Math.Round((( signLat*CDec(txtLatSec.Text) / 60) + signLat*CInt(txtLatMin.Text)) / 60 + CInt(txtLatDegrees.Text), 7)
        txtLngDecimal.Text = Math.Round((signLng*(CDec(txtLngSec.Text) / 60) + signLng*CInt(txtLngMin.Text)) / 60 + CInt(txtLngDegrees.Text), 7)

AW
0
 

Author Closing Comment

by:Nate_LR
ID: 39188342
Thanks
0
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 39188354
Glad to be of assistance.

AW
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

If you're writing a .NET application to connect to an Access .mdb database and use pre-existing queries that require parameters, you've come to the right place! Let's say the pre-existing query(qryCust) in Access takes a Date as a parameter and l…
An ASP.NET Web Form User Control is not newly introduced in ASP.NET. In fact, it was an old technology yet still playing a role to generate web content, especially when we want to use it to have a better and easy way to control part of the web conte…
The video will let you know the exact process to import OST/PST files to the cloud based Office 365 mailboxes. Using Kernel Import PST to Office 365 tool, one can quickly import numerous OST/PST files to Office 365. Besides this, the tool also comes…
Did you know PowerShell can save you time with SaaS platforms? Simply leverage RESTfulAPIs to build your own PowerShell modules. These will kill repetitive tickets and tabs, using the command Invoke-RestMethod. Tune into this webinar to learn how…

602 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question