Dear ENVI users, Basically, I am aiming to identify the groundwater discharge under the sea not along the coastal line.   I am planning to order an ASTER image that helps me out to identify the groundwater discharging (springs) under the sea.  Meanwhile, I am not sure which type of ASTER image is suitable for myproject. Basically I am trying to identify a plume based on temprature contrast using ASTER image with better pixel resolution than landsat thermal band (60 m).  I presume the ASTER image does have range of resolution from 15 to 90m. Is there any ASTER thermal image with 15m or 30 m. I read that the thermal infrared images have got 90 m. Hoever, I am after a high resolution better than the Landsat themanl image (60 m).   Also, how could I search for the ASTER scene so that I can pick out the image recorded at night if it helps more to intensify the contrast in groundwater temprature with the sea temprature.   Also,  if you have any idea what is the approximate cost of ASTER image, just to work out how much do I need for my project area.   I  do appreciate for your suggestion   Regards, Yohannes