Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a points with coordinates EPSG Projection 3059 – LKS92 / Latvia TM. I need to compute the distance in meters between two points.
It is easy to compute euclidean distance between two points, but I am not sure if the resulting distance is expressed in meters?
PROJCS["LKS92 / Latvia TM",
UNIT["metre",1,
PARAMETER["scale_factor",0.9996],
The unit is 1 meter, but should the scale factor taken into account? Maybe 1 unit in this system is not 1m but 0.9996 meters?
No, the scale factor in a map projection is integrated in the projection calculations. The purpose of the factor is to minimise overall distortion as the easting from the central meridian (24°E) increases. 0.9996 is a common factor when transverse mercator (TM) is involved.
Once projected, the resultant coordinate is in metres (in this case), no further scaling is needed, and you can use a simple Pythagorean hypotenuse calculation to determine a distance.