This paper, led by PhD student Nathan Dadap, uses Planet data to map, for the first time, drainage canals in the tropical peatlands of Southeast Asia, a hotspot of CO2 emissions. These canals lower the water table and cause large CO2 emissions associated with the resulting peat decompositon. We further showed that, contrary to common assuptions in estimating carbon emissions, there is significant diversity in drainage density within land use classes. These maps may therefore be useful in building better emissions estimates for this hotspot region. The paper is in review at AGU Advances, but can now be read as a preprint on the Earth and Space Science Open Archive, here.