Opheim, HaraldJ. L. Encarnacao2015-09-292015-09-2919811017-4656https://doi.org/10.2312/eg.19811012In order to reduce storage and subsequent processing costs for a digitized cartographic curve, we may wish to reduce the data set. The data reduction method which is described in this paper, can be used on-line during the digitizing as well as afterwards on the total data set. We only wish to retain the salient points, and thus data reduction can be regarded as a tool for smoothing a curve. The paper also describes another way of smoothing, based on signal theory.10.2312/eg.19811012