Quadrillage: The dividing of an area into squares or sectors.  Figuratively, this can be used as a translation of “crisscrossing,” ie drawing lines across the map.

As seen in: « Barack Obama et Mitt Romney, après un dernier débat, entamaient mardi le sprint final de la campagne présidentielle, synonyme de quadrillage inlassable des Etats qui pourraient faire la différence dans deux semaines, sur fond de sondages très serrés. »

(Translation: “Barack Obama and Mitt Romney, after their final debate, started the final sprint of the presidential campaign Tuesday, synonymous of the indefatigable crisscrossing of States that could make the difference in two weeks, based on a very tight race in the polls.”)

http://www.20minutes.fr/monde/1028404-etats-unis-apres-debat-obama-romney-jettent-sprint-final