What is the difference between SAR and LIDAR? I have used lidar, which is great in sand or vegetated covers. But I have been out of the game for a few decades now so am unfamiliar with SAR.
SAR (Synthetic Aperture Radar) has been around a few years longer than LIDAR has. LIDAR uses laser and laser reflection. SAR uses RF. They have advantages and disadvantages depending on what you are trying to look through and what you are trying to measure.
You can use SAR higher up than LIDAR, because SAR is not affected as much by cloud cover. However, SAR is less detail oriented than LIDAR.