1. Department of Geographic Engineering and Techniques of Graphic Expression Polytechnic School of Mining and Energy Engineering University of Cantabria Torrelavega, Cantabria, Spain
2. Department of Geographic Engineering and Techniques of Graphic Expression School of Civil Engineering University of Cantabria Santander, Cantabria, Spain
3. Department of Transports and Technology of Projects and Processes Polytechnic School of Mining and Energy Engineering University of Cantabria Torrelavega, Cantabria, Spain