Urban remote sensing monitoring – helping to build a comprehensive smart city network

Urban remote sensing research refers to the use of remote sensing technology to study the social and natural environment of cities, providing a basis for urban planning, management, and construction. It includes the identification and classification of certain static urban phenomena, such as urban land use and urban population, as well as the monitoring of their dynamic changes, providing fundamental data for urban information systems. With the continuous acceleration of urbanization, urban remote sensing research has become one of the main development directions in disciplines such as geography, ecology, and urban planning.

Urban remote sensing monitoring

Urban remote sensing monitoring and analysis utilizes remote sensing technologies such as satellites, aircraft, and drones to acquire urban surface information and extracts various urban characteristic indicators through image processing and remote sensing interpretation. Remote sensing images are the foundational data for urban remote sensing monitoring and analysis. By classifying, segmenting, and detecting changes in remote sensing images, information such as urban surface temperature, ecological indices, building distribution, and land use can be obtained. Furthermore, remote sensing technology can be used to monitor and analyze indicators such as urban green coverage, water body expansion, and population density.

Urban surface temperature monitoring

Today, over 55% of the world's population lives in cities, and the agglomeration effect of urban clusters and metropolitan areas is attracting more and more people to cities and shaping them. Cities have become the main window for humans to perceive climate change and its impacts, and local urban climates, represented by urban heat waves and urban heat islands, are undergoing profound and dramatic changes. Urban surface temperature is a key parameter characterizing these changes and plays an important role in urban climate and environmental research. As global surface temperature data products continue to improve in terms of spatiotemporal resolution, accuracy, time span, and coverage completeness, surface temperature will play an increasingly important role in global change research.

CAS Xi'an Optics & Aerospace - Urban Surface Temperature Inversion

The image above shows the surface temperature inversion results using Huzhou City as an example. As can be seen from the image,The surface temperature in urban areas is generally higher than that in mountainous and forested areas.  

△Remote Sensing Ecological Index Evaluation Classification

Urban remote sensing ecological index

In addition, the remote sensing ecological index model is also a unique urban ecological environment evaluation method based on remote sensing technology.The remote sensing ecological index, based on remote sensing technology, couples vegetation index, humidity index, surface temperature and building-bare soil index obtained by inversion. It can quickly monitor and evaluate the regional environment, realize visualization, spatiotemporal analysis and trend prediction of regional ecological environment changes, and make up for the shortcomings of the EI index.  

CAS Xiguang Aerospace - Urban Remote Sensing Ecological Index Inversion

As can be seen from the figure,The ecological condition of cities is worse than that of areas with high vegetation cover, such as woodlands, but most urban areas are still in a moderate to good condition.  

Today, urban remote sensing monitoring and analysis has become an important tool, providing information and decision support for urban development, environmental protection, and resource management. With the continuous development and application of remote sensing technology, it is believed that urban remote sensing monitoring and analysis will play an even greater role in the future, making greater contributions to sustainable urban development and ecological environmental protection.