GMAP: FromLocalToLatLng returns inaccurate coordinates.

[wernervs1]

Hi

I have managed to successfully integrate the GMAP.net control with my Labview application, however, when I use the FromLocalToLatLng function to get the coordinates back, the resultant coordinates are slightly offset. Has anybody else encountered this issue? 

Kind regards.

[mikeporter]

How slight? How do ypu know that they are offset? Could it be rounding error?

Mike...

[wernervs1]

Hi Mike

Thank you for your quick responce!

I compared the coordinates I received with coordinates I got back from Google Maps for the same spot. I did a similar excercise, but used C# instead, and got the correct values (compared to Google Maps) back. 

So I don't think the problem lies in the GMAP.net dll set. I'm kinda wondering about the coordinates that the mouse event is returning.

Kind regards

Werner

[Supertramp]

Hi werner vs1,

I would like you to give more information about how LabVIEW is getting data. Maybe you can specify more detailed information in order to understand why are you getting this offset

[wernervs1]

Hi Supertramp

I think I might have found a fix for this problem. I printed out the mouse coordinate in the C# app I did and found that at the top left corner of the control box, it was 0,0. I then had a look at the top left corner coordinates of the control box on the LABVIEW app, and found that it was much higher numbers for both horizontal and vertical. I created a reference of the activeX control and then subracted it's size from the mouse coordinates. The resultant coordinates now translates to the correct physical lat long coordinates.

I took some screenshots of the test point on my map and the same point on Google Maps before and after the fix.

[Supertramp]

That should probably be that the application is obtaining a constant value from somewhere, as yous said before, it would be like an offset in the obtained signal. Your solution was ingenious.
Thanks for sharing wernervs1.