Unmanned Aerial Systems (UAS) for environmental applications special issue preface

Simic Milas, A.; Sousa, Joaquim J.; Warner, Timothy A.; Teodoro, Ana C.; Peres, Emanuel; Gonçalves, José A.; Delgado Garcia, J.; Bento, Ricardo; Phinn, Stuart; Woodget, Amy. International Journal of Remote Sensing 39, 15-16: 4845- 4851. Revista Internacional. DOI: https://doi.org/10.1080/01431161.2018.1491518