Solved

Plotting geographical coordinates to a map

Posted on 2003-12-05
7
1,113 Views
Last Modified: 2012-08-13
Hello
I would appreciate any help on the following question:
I need to convert geographical coordinates (Latitude and Longitude) to x,y coordinates, and display a text box (or label) on a form (ms-access) at the appropriate position. (The map is a bmp image of Europe).  
Many thanks in advance.
0
Comment
Question by:Bernard_AC
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
7 Comments
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 9884580
what PROJECTION has been used to create the map of Europe.?

In general, it is NON-TRIVIAL exercise to transform Lat-Lon into X-Y.

AW

0
 

Author Comment

by:Bernard_AC
ID: 9884990
The map is a simple bitmap image of Europe - I don't know how it was created, or on what scale.
If I'm reading your query correctly, do I understand that you are asking if there are preset coordinates (or points of reference) on the bitmap image? Thanks.
0
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 9886027
no.  When a map is made, adjustments must be made to convert the curved surface of a globe to a flat surface.  This is called the projection.  For instance, most maps in an Atlas use the MERCATOR projection, which has the effect of stretching the map EAST-WEST as you move away from the equator.  But there are many other projecte ion that might be used, and each of them has a different way of convertin latitute and longitudfe into rectangular coordinated (X-Y).  Without knowing the projection involved, you woul be simply guessing.

The fact that you have a bitmap means absolutely nothing.  You could gues if you know the latitude and longitude of each of the four corners of the map.  YOu could then interpolate to get the location of any other point on the map, but that would be quite crude, and approximate.

AW
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:Bernard_AC
ID: 9887562
OK - that's pretty much the line of thought that I had established. Unfortunately the project I am working on has me limited to maps that the cust already has in use. So I guess that I will end up trying to approximate, after working out the lat and long of the corners. Just out of curiosity, do you happen to know of a good source of MERCATOR projected maps (Political) which I could get hold of? Many thanks for your help.
0
 
LVL 44

Accepted Solution

by:
Arthur_Wood earned 125 total points
ID: 9889819
not right off the top of my head.  Try GOOGLE.

http://www.google.com

AW
0
 

Author Comment

by:Bernard_AC
ID: 9892158
That's where they got the maps they use. I guess I'll try to work around the flat projection issue, perhaps by using some kind of meridional part correction.
Many thanks for your input.

0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Displaying an arrayList in a listView using the default adapter is rarely the best solution. To get full control of your display data, and to be able to refresh it after editing, requires the use of a custom adapter.
Although it can be difficult to imagine, someday your child will have a career of his or her own. He or she will likely start a family, buy a home and start having their own children. So, while being a kid is still extremely important, it’s also …
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…

696 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