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DIGITAL.CSIC
Article . 2010 . Peer-reviewed
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On the optimal choice of the standard parallels for a conformal conical projection

Authors: Otero Juez, Jesús; Sevilla, Miguel J.;

On the optimal choice of the standard parallels for a conformal conical projection

Abstract

Vengo no studiati due metodi di ottimizzazione per la scelta dei paralleli standard per una proiezione conica conforme. L'uno e basato su un criterio detto del «mínimo errore», I'altro su quello della «minima dilatazione quadratica media». In entrambi i casi I'idea e quella di rendere minima, rispetto alle due costanti che descrivono la famiglia di proiezioni coniche conformi, una funzione che misura lo scostamento della proprietá di equivalenza. I parametri fondamentali sono I'errore di scala Iineare ed areale rispettivamente. Il secondo metodo risulta essere piü adatto da un punto di vista numerico, sebbene il primo presenti alcuni vantaggi di tipo analitico quando la regione da rappresentare contenga anche il polo. Vengono infine forniti alcuni esempi numerici basati sul secondo criterio.

Two optimization methods are studied for choosing the standard parallels for a conformal conical projection. One is based on a criterion called of minimum error and the other is based on a criterion of minimum mean square dilatation. In both cases the idea is to minimize, with respect to the two constants that describe the family of conformal conical projections, a function which measures departure from equivalence. The basic parameters are the linear scale error and the area scale error respectively. The second method is shown to be more suitable from a numerical point of view although the first one presents some analytical advantages when the region to be mapped contains the pole. Some numerical examples based on the second criterion are given.

Este trabajo fue publicado primero en el Bollettino di Geodesia e scienze affini, y posteriormente en la publicación del Instituto de Astronomía y Geodesia (CSIC-UCM).

Peer reviewed

Country
Spain
Related Organizations
Keywords

Cartografía geográfica, Proyección cónica, Cartografía geodésica, Paralelo

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