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01.16.2004 at 05:19PM PST, ID: 20853586
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6.2

Convert Latitude/Longitude values to x,y on a map

Asked by jloring in GIS & GPS Programming

Tags: , ,

Hi, desperate for some help.
I need to place red dots on a map of the United States. The dots represent the locations of several companies, universities and cities on a map of the U.S. We're using Macromedia Flash to display the map and plot the dots. Obviously we can do this manually using an external file, but long story short this data is kept in a database and will change frequently and without warning.

I only have the the latitude and longitude of these universities/companies/cities. I need to convert the latitude/longitude to x,y coordinates on the map. Once I have the x,y plotting them on the map is simple.

I have a map I obtained from http://nationalatlas.gov/natlas/ so I trust it's accuracy. I know the longitude/latitude of the 4 corners of this map. I have been playing with various formulas to no avail. I'm close, but I'm not close enough.

http://www.graphiteproductions.com/mapping/flash/map.php

Much thanks.
Jennifer. Start Free Trial
[+][-]01.18.2004 at 04:59PM PST, ID: 10142879

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About this solution

Zone: GIS & GPS Programming
Tags: latitude, convert, longitude
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Solution Provided By: Lowfatspread
Participating Experts: 6
Solution Grade: A
 
 
[+][-]01.20.2004 at 10:06AM PST, ID: 10156902

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