Morphometry is rising today a new higher level due to theoretical understanding its subject and method. The theory is based on considering the landforms as' its object, as well as their distinction, boundary's character, types of points, lines and surfaces which make up structural invariants, the manifestation of the latter in the land surface. In the development of morphometry the cartographic sign systems play the large role, as well as morphometrical mapping techniques of which isolineal pictures are the most convenient. In prospect morphometry and cartometry will become the nucleus of many interconnected metric disciplines such as photogrammetry, photometry, dynamic cartometry, hologrammetry etc. The "Morphometrical analysis of landforms" by Yu. Simonov is analyzed in connection with these problems.