I am having a difficult time trying to figure out how to add feet to a latitude and longitude because I am very unfamiliar with lat and long coordinates. I have found several formulas to try and convert latitude and longitude to feet but I am not sure which ones are correct. For example, this website: http://www.colorado.edu/geography/gcraft/warmup/aquifer/html/distance.html I am not sure how to use or apply this method.
I have the latitude and longitude of two points and I want to be able to find the vector of the points. I believe I have to convert the latitude and longitude to feet in order for this to work. Can anyone please help me out in trying to figure this out?