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L. Limites-non-Érodables, jachères ou bandes végétalisés) qui entourent les parcelles ainsi que les postes de BSNE ont été repérées par leurs coordonnées géographiques grâce à l'utilisation d'un GPS de type Garmin, Ces coordonnées ont été ensuite converties en coordonnées cartésiennes dans la projection UTM

. Ainsi, chaque limite non érodable, rectiligne et fixe, a été caractérisée par une équation linéaire de type Y = aX + b

M. Appartenant-À-la-fois-À-la-limite-non-Érodable-et-À-la-droite, BSNE I , M) alors on aura : à partir de l'équation (1) : Y m =aX m + b (3) à partir de l'équation

P. Topographie-des-parcelles and . Le-lever-topographique-a-Été-effectué,-en-septembre, avec l'utilisation d'un niveau de chantier (lunette de visée de type Wild Heerbrugg NK 10), une mire et une chaîne graduée longue de 50 m. Le réticule de la lunette de visée porte 2 traits symétriques par rapport au trait niveleur. Ainsi, l'image de la mire (tenue perpendiculairement à la visée) se projette sur le réticule et la lecture de hauteur se fait aux 3 niveaux du réticule (bas, milieu, haut) Ces mesures permettent de corriger d'éventuelles erreurs de lecture puisque l'altitude mesurée, 2006.

L. Est-exprimée-en-centimètre, L'établissement définitif de la carte est réalisé par utilisation du logiciel Surfer