In journal Frontiers in Plant Science we published an article assessing the role of right timing of the data acquisition for detection of invasive species (giant hogweed and knotweeds). Müllerová, J., Brůna, J., Bartaloš, T., Dvořák, P., Vítková, M., & Pyšek, P. (2017). Timing is important: unmanned aircraft versus satellite imagery in plant invasion monitoring. Frontiers in Plant Science 8: 887.