Skip to main content

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and GDEM

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and GDEM (Global Digital Elevation Model) are related in the context of Earth observation and geographical data. Here's an explanation of both:

1. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer):
    ASTER is a remote sensing instrument primarily onboard NASA's Terra satellite.
    It's designed to capture detailed data about the Earth's surface and atmosphere in multiple spectral bands, including visible and nearinfrared, as well as thermal infrared.
    ASTER provides highresolution imagery and is used for a wide range of applications, such as land cover mapping, environmental monitoring, and geological studies.
    It's capable of capturing both daytime and nighttime data, making it valuable for various scientific and practical purposes.


2. GDEM (Global Digital Elevation Model):
    GDEM refers to a digital representation of the Earth's surface topography, specifically its elevation or height above sea level.
    The GDEM produced using ASTER data is known as the ASTER GDEM.
    ASTER GDEM is a global elevation dataset that provides detailed and accurate elevation information for the entire Earth's surface.
    It's generated by processing stereo pairs of ASTER images to create a 3D model of the terrain, allowing for the calculation of elevation values.
    The ASTER GDEM dataset has been widely used in applications such as topographic mapping, hydrological modeling, and environmental analysis.

In summary, ASTER is an advanced remote sensing instrument that collects various types of Earth data, including imagery and thermal measurements. One of its valuable products is the ASTER GDEM, which is a highquality global elevation dataset used for a variety of geospatial applications.


Comments

Post a Comment

Popular posts from this blog

The global dimensions of disaster

Disasters are not merely natural occurrences but complex interactions between natural hazards and human vulnerabilities. To effectively address disaster risk, we must consider several interconnected dimensions: 1. Vulnerability: Definition: The susceptibility of individuals, communities, or assets to harm from a disaster. Factors: Socioeconomic conditions, geographic location, and environmental factors influence vulnerability. Example: Communities with high poverty rates and limited access to resources are more vulnerable to disaster impacts. 2. Exposure: Definition: The degree to which people, property, and infrastructure are located in hazard-prone areas. Factors: Population density, land use patterns, and infrastructure development influence exposure. Example: Coastal cities with high population density are highly exposed to hurricane and tsunami risks. 3. Capacity: Definition: A community's ability to prepare for, respond to, and recover from disasters. Factors: Strong ...
Post a Comment
Read more

Overview of Disasters in India

India's Vulnerability to Natural Disasters India's diverse geography and climate make it highly susceptible to a range of natural disasters. These events, including earthquakes, tsunamis, floods, droughts, cyclones, and landslides, can have devastating consequences for millions of people and the economy. Major Natural Disasters Affecting India: Earthquakes: Tectonic Setting: India's position on the Indian Plate, which is colliding with the Eurasian Plate, makes it prone to seismic activity. Impact: Earthquakes can cause widespread destruction, including building collapses, landslides, and tsunamis. The 2001 Gujarat earthquake is a prime example of such devastation. Tsunamis: Oceanic Triggers: Underwater earthquakes and volcanic eruptions can generate tsunamis, as seen in the 2004 Indian Ocean Tsunami. Impact: Coastal areas are particularly vulnerable to tsunamis, which can lead to massive loss of life and property. Floods: Monsoon Influence: India's...
Post a Comment
Read more

Water Act 1974

The Water (Prevention and Control of Pollution) Act of 1974 is a significant piece of legislation in India aimed at preventing and controlling water pollution. Here are some key facts about the Act: 1. Objective: The primary objective is to prevent and control water pollution and maintain or restore the wholesomeness of water in the country. 2. Establishment of Boards:    - Central Pollution Control Board (CPCB): The Act mandates the establishment of the CPCB to oversee and coordinate activities across the nation and advise the Central Government.    - State Pollution Control Boards (SPCBs): Each state is required to establish its own SPCB to plan comprehensive programs for the prevention and control of pollution. 3. Powers and Functions:    - The Boards have the authority to inspect any sewage or trade effluents, works, and plants for the treatment of sewage and trade effluents.    - They can establish standards for the discharge of pollutants into water bodies and ensure adherence to...
Post a Comment
Read more

Environment Management DRR

Environmental management plays a crucial role in disaster risk reduction (DRR) by harnessing the power of natural ecosystems to prevent and mitigate the impacts of disasters. By protecting and restoring these ecosystems, we can strengthen community resilience and promote sustainable development. Interconnections Between Environmental Management and DRR: Ecosystem-Based Disaster Risk Reduction (Eco-DRR): Natural Barriers: Ecosystems like forests, wetlands, and coral reefs act as natural barriers, reducing the impact of hazards like floods, landslides, and storm surges. Resilience Building: Healthy ecosystems enhance community resilience by absorbing excess rainfall, preventing erosion, and mitigating the effects of climate change. Environmental Considerations in Disaster Planning: Sustainable Practices: Incorporating environmental considerations into disaster planning helps prevent further environmental degradation, which can exacerbate disaster impacts. Resource Conservati...
Post a Comment
Read more

Forset management and water conservation

Forest management and water conservation are closely intertwined concepts, as forests play a crucial role in maintaining water resources. Here's an explanation of their connection: 1. Water Regulation: Forests act as natural sponges, absorbing rainwater and releasing it gradually. Trees help regulate water flow, preventing rapid runoff and reducing the risk of floods. 2. Groundwater Recharge: Trees contribute to groundwater recharge by allowing rainwater to percolate into the soil. This replenishes underground aquifers, which are important sources of freshwater. 3. Erosion Control: Forests provide vegetation cover that protects soil from erosion caused by rainfall. This, in turn, helps maintain the quality of water bodies by preventing sedimentation. 4. Streamflow Maintenance: Healthy forests ensure consistent streamflow. Trees release water through transpiration, influencing local and regional precipitation patterns and sustaining rivers and streams. 5. Biodiversity and Water Qual...
Post a Comment
Read more