Abstract: A method for method for correlating altitude and/or grade information with route points of a digital map includes correlating geographic altitude information and/or grade information of a digital geographic map with route points of a digital map. Altitude data of a road is derived from the correlated geographic information. The correlated geographic information is corrected by smoothing the derived altitude data so as to approximate a course of a road to the correlated geographic information. The smoothing is performed as a function of at least one attribute of the road.

Abstract: The present invention pertains to a representation of at least one area of the earth's surface, whereby the area is divided into individual sections and at least two data are indicated for each of these sections, whereby the first datum (ELV) contains an elevation indication of the surface above a predetermined level, and the second datum (QTY) gives a measure of the accuracy and/or reliability of the first datum.