[en] Times and places of transition are traditionally researching ways for Historical and Archaeological disciplines. Researchers focus their attention on them for being important themes to understand complex processes. The area studied is located in Spanish North Plateau (Meseta), between the current provinces of Burgos and Palencia. In this area we can find two different and important aspects. First of all, in a geographical way, there are two dialectical spaces, one on the centre of de Cantabric Mountains, and the other on the alluvial plains of Duero basin. Secondly, the historical importance is related to the traditional investigations of preroman borders. Cantabrian peoples, Turmogii and Vaccei were located in this area. Geographical and Historical characteristics had made this zone as an area of conflict. Wars against Astures and Cantabrian began from military bases located in current towns of Sasam?n and Herrera de Pisuerga. Other characters, such as the hill-forts were established in the mountains. Nowadays, the role played by pre-roman settlements is still discussed. Our work deals with the study of settlements within two broad chronological groups, the Iron Age and the Early Imperial period; in order to study change processes between different times. We have used GIS tools, especially site catchment analysis to look into subsistence strategies through the time frame related before; this analysis uses a cost surface estimation based on calculi of isochronous. In the same way we used view shed analysis and topographical prominence index in order to probe some hypotheses of differences within settlement patterns. All the data produced have been handled with statistical help.

[es] Los espacios y las ?pocas de transici?n son tradicionalmente objetos de investigaci?n hist?rica y arqueol?gica. Focalizan la atenci?n de los investigadores porque representan momentos y lugares clave para la comprensi?n de procesos complejos. La zona de nuestro estudio se localiza en el norte de la Meseta entre las provincias de Palencia y Burgos. En esta zona confluyen dos aspectos interesantes, geogr?ficamente es el espacio de transici?n entre la Cordillera Cant?brica y la meseta sedimentaria. Hist?ricamente se corresponde con el l?mite territorial asignado a los pueblos prerromanos de c?ntabros, turmogos y vacceos. Estos dos elementos le han conferido un car?cter de ?zona conflictiva?, las guerras contra c?ntabros y astures se organizan desde este mismo territorio, con bases militares en las actuales localidades de Sasam?n y Herrera de Pisuerga y grandes castros cuyo papel en las mismas guerras a?n es objeto de debate, entre estos est?n Monte Bernorio, La Ula?a y Amaya. Nuestro trabajo consiste en un estudio del poblamiento en dos grandes contenedores hist?ricos, la Edad del Hierro y la ?poca romana altoimperial, con el objetivo de estudiar cu?les son los procesos de cambio entre diferentes ?pocas. Hemos utilizado herramientas SIG, en especial la delimitaci?n de is?cronas para estudiar las ?reas de captaci?n y la evoluci?n de las estrategias de subsistencia en el marco cronol?gico rese?ado. Del mismo modo hemos dispuesto un estudio de visibilidades e ?ndices de altitudes relativas para comprobar hip?tesis sobre el poblamiento en llano y en altura ya mencionadas en la bibliograf?a. Finalmente el producto de todos estos an?lisis se ha recogido y estudiado con el apoyo de sencillos m?todos estad?sticos.