Land Surveyor Forum

Replies

• 

  JF Forero August 7, 2014 at 10:48am

  Map projections are used to represent a portion of the Earth's surface into a map. A mathematical procedure is followed (geodetic conversion) and the scale factor should be accounted for. No matter which map projection is selected, this representation is just approximated.
• 

  Harry Mlauzi July 31, 2014 at 9:05am

  well map projections are used to counter a lot of errors that would gradually build up in our calculations from such elementary reductions such as converting slope distance to horizontal distances.Projections help us accuratly position a 3 dimensional surface unto a 2 dimensional piece of paper.Thus this rabbit hole goes very deep starting from basic concepts up to the complex GPS problems of today
• 

  adam Cralle July 30, 2014 at 5:35pm

  " officially" the EPSG governs projections however with respect to survey data and geodetics in general, the rabbit hole goes much much deeper. Educate yourself on the difference between ellipsoid and geoid models and the processes involved with deriving a solution, respectively.
• 

  Don July 30, 2014 at 5:18pm

  Lat and Lon are also a map projection.. there are very many projections and they all have some distortion.. we keep trying to figure out the shape of the earth.. and the shape of the earth keeps moving.

  This is a fairly good read..

  http://www.nationalatlas.gov/articles/mapping/a_projections.html