I should say that Digital Earth as a new concept of involving remote sensing data into decision making (in a broad sense) is a very promising area of interdisciplinary research.

Developing algorithm for very high resolution data classification would be a promising field.

Image simulation with higher accuracy, lidar remote sensing, remote sensing using UAVs and instant air pollutant measurements onboard drones.

thank you for the information

your question is very very general

regrads

could you make it more specific

THERMAL,SAR

quantification of green house gases,agro ecosystem