@article{nunes_medeiros_santos_2018,  title={SEMI-AUTOMATIC ROAD NETWORK EXTRACTION FROM DIGITAL IMAGES USING OBJECT-BASED CLASSIFICATION AND MORPHOLOGICAL OPERATORS},  volume={24},  ISSN={1982-2170},  url={https://doi.org/10.1590/s1982-21702018000400030},  DOI={10.1590/s1982-21702018000400030},  number={4},  journal={Boletim de Ciências Geodésicas},  publisher={Universidade Federal do Paraná},  author={Nunes, Darlan Miranda and Medeiros, Nilcilene das Graças and Santos, Afonso de Paula dos},  year={2018},  month={Oct},  pages={485–502} }