?What is Remote Sensing

Remote sensing is defined as the detection of objects from a distance, such as the earth from orbiting satellites


ASTER satellite images taken before and after the Sichuan Earthquake in China in 2009.

Before - vegetated areas are red, bare ground grey


After – massive scale of landslides due to ground movement



and the flooding in downtown New Orleans following Hurricane Katrina in 2007, viewed from the French satellite SPOT (resolution 10m)
(below)





After- flooded areas dark blue

In LSGI we use remote sensing for many applications in Hong Kong


Salinity concentrations in Pearl River Estuary from NASA’s Terra MODIS satellite(land areas masked to black)





ASTER satellite image of Kowloon’s Urban Heat Island on an August night




Landscape Heritage: The ancient tea terraces of Tai Mo Shan cannot be seen on the ground but are viewed from IKONOS satellite