Abstract

ALBA-FERNANDEZ, María Virtudes. Application of an equivalence test to the thematic-type control of magnitudes derived from a Digital Elevation Model. Rev. cartogr. [online]. 2021, n.103, pp.165-181.  Epub Sep 27, 2021. ISSN 2663-3981.  https://doi.org/10.35424/rcarto.i103.993.

This paper proposes a thematic quality control method (based on classes) applicable to the cases of slope and aspect derived from Digital Elevation Models (DEM). The novelty of the proposed method is that it adopts the perspective of detecting “relevant differences” instead of “exact equality”, which is the usual one in the most generalized hypothesis testing problems. Working with categories strengthens the approach to the variables that are controlled, and the perspective of “relevant differences” allows controlling the degree of “closeness” that is desired by means of the Hellinger distance. In the practical case presented, the slope and orientation models derived from two DEM products are compared, the first is a product with a 2x2 m resolution, which is considered as a reference or standard for the control, and the second is a product with 5x5 m resolution, which is the product to evaluate. The application to this case allows us to understand how the most significant aspects of the method are related, and to understand its analytical capacity.

Keywords : Digital Elevation Model; slope; aspect; equivalence test; Hellinger distance.

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