Land cover and land use analysis aims at mapping and monitoring
the geo/biophysical
parameters of Earth’s surface, a process critical in the environment and urban sciences
studying
the ever-changing evolution of our planet. This analysis is very important to address
the everincreasing
environmental concerns like climate change, deforestation, soil degradation, water
pollution, and air pollution. These crucial issues mandate the need for creating highly
accurate
land cover maps but despite this fact, such endeavors are hindered by the
unavailability of
remote sensing data and in case remote sensing data is available, the ground truth
corresponding to that remote sensing data is not available most of the times which is
necessarily
required for validation purpose. Moreover, the speckle noise and geometrical
distortions make
land cover classification a challenging task especially in complex landscapes. To meet
all these
demanding requirements of global land cover monitoring, high-resolution imaging sensors
acquire multispectral, hyperspectral, optical, and radar data. Optical sensors and
synthetic
aperture radar (SAR) are the most commonly used earth observation instruments abroad
satellites. Optical sensors have the advantage of obtaining data from multiple
wavelengths.
However, the use of an optical sensor can be problematic in some tropical regions due
to cloud
cover. Whereas in the case of SAR data, cloud cover does not affect data acquired since
microwaves used by SAR sensors can penetrate through clouds and the data could be used
for
characterization of land use and land cover. Also, another advantage of SAR-based
remote
sensing is its capability to capture data day and night which enables the capture of
long time
series datasets that can be used to monitor land cover changes.
Rajat Garg,
Assistant Professor,
Department of Mechanical Engineering,
Lloyd Institute of Engineering & Technology, Greater Noida