Urbanization is an important component of global environment change. Inspite of advances in remote sensing technologies, monitoring urban landscapes at large scales remains a challenging task. This study demonstates a methodology to map urban land expansion at continental-global scale.
As one of the rapidly urbanizing regions of the world, East and Southeast Asia is experiencing high rates of built-up expansion and population growth. The higher rate of growth of urban population compared to urban land has resulted in increased densities of major urban agglomerations. The results of this study contrasts previous sample-based studies, which conclude that cities are universally declining in density.
The QuickBird mission ended on 27 January,2015. During its 13 year of service it orbited the Earth over 70,000 times capturing 636 million square kilometers of high resolution imagery of the Earth's surface. QucikBird captured it's last image on 17 December, 2014 at Port Elizabeth in South Africa.
The data will be accessible on EarthExplorer by the US Geological Service (USGS).The release dates for different regions are:
The data will be accessible on EarthExplorer by the US Geological Service (USGS).The release dates for different regions are:
The lead spacecraft in Europe's new multi-billion-euro Earth observation (EO) programme is built and ready to go into orbit.
The lead spacecraft in Europe's new multi-billion-euro Earth observation (EO) programme is built and ready to go into orbit.
Mangroves are important coastal ecosystems that provide valuable ecosystem services like natural protection against storm surges, hurricanes and tsunamis and contribute to fish stocks. As part of NASA's Land Cover and Land Use Change program, Dr. Simard and his team have developed new radar remote sensing techniques to monitor mangrove health. These techniques are expected to contribute to improved decision making and mangrove conservation.