Experiences using real time kinematic GPS positioning for erosion and hydrographic surveys in Doñana National Park (Spain)
2021
Gili Ripoll, José Antonio | Ibáñez Martínez, Enric | Solís, J | Puig i Polo, Càrol | Buill Pozuelo, Felipe | López Bravo, Rogelio | Lantada, Nieves | Núñez Andrés, María Amparo | Corral Manuel de Villena, Ignacio de | González Lopez, Sergio | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental | Universitat Politècnica de Catalunya. EGEO - Enginyeria Geomàtica
Last decade, real time kinematics (RTK) GPS methods have been developed with high productivity and good theoretical precision, enabling the coverage of wide areas. The main objective of this contribution is to ascertain the performance of this method in the study of thest areas "A" (about 12 km2) within the Doñana National Park wetlands. One of the aims of the research Project was the detection and monitoring of sub-decimiter level terrain changes due to water erosion or sand sedimentation. The technique used is GPS navigation and profiling along N-S paths 50 m apart during the dry season. The firts survey has been carried out in summer 1998, including repeatability tests. About 20000 terrain points have been obtained. The survey has been reapted in July 2000. After filtering and editing, conclusions about precision have been derived from the repeatability test and compring both surveys. Other practical remarks are related with the total number of GPS available during the fieldwork, the inicialization process using RTK at increasing distances, and the GPS positioning during high geomagnetic activity days.
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