Tasapinnaliste ristkoordinaatide süsteemiks on L-EST97, mille koordinaadid arvutatakse EUREF-EST97 geodeetilistest koordinaatidest kasutades Lamberti kahe lõikeparalleeliga koonilisest konformsest kaardiprojektsiooni LAMBERT-EST ja rahvusvahelist referentsellipsoidi GRS80.
Planar coordinate system [is] a two-dimensional measurement system that locates features on a plane based on their distance from an origin (0,0) along two perpendicular axes.
Each projected coordinate system, such as "Universal Transverse Mercator WGS 84 Zone 26N," is defined by a choice of map projection (with specific parameters), a choice of geodetic datum to bind the coordinate system to real locations on the earth, an origin point, and a choice of unit of measure.
