ASTER. MODIS. ASTER DEM

ASTER, MODIS, and ASTER DEM

1. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer):

- ASTER is a remote sensing instrument aboard NASA's Terra satellite, launched in 1999. It is designed to capture high-resolution images of the Earth's surface in multiple spectral bands, including visible, near-infrared, and thermal infrared.

- ASTER provides data at three different spatial resolutions: 15 meters, 30 meters, and 90 meters. This versatility allows it to capture detailed information about the Earth's surface.

- Applications of ASTER data include land cover classification, land surface temperature analysis, geological mapping, and environmental monitoring.

2. MODIS (Moderate Resolution Imaging Spectroradiometer):

- MODIS is another instrument on NASA's Terra satellite, as well as the Aqua satellite, launched in 1999 and 2002, respectively. MODIS is known for its moderate spatial resolution, capturing data at 250 meters, 500 meters, and 1,000 meters.

- MODIS provides daily global coverage and is widely used for monitoring Earth's climate, weather, and environmental changes. It measures a wide range of parameters, including land surface temperature, vegetation health, cloud cover, and sea surface temperature.

- MODIS data is crucial for climate studies, weather forecasting, and tracking natural disasters like wildfires and hurricanes.

3. ASTER DEM (Digital Elevation Model):

- ASTER DEM is a product derived from the ASTER sensor's stereo images. It provides a digital representation of the Earth's surface elevation at a high spatial resolution of 30 meters.

- ASTER DEM data is used to create accurate topographic maps, assess terrain characteristics, and study landforms. It's vital for applications like flood modeling, landslide prediction, and urban planning.

- Unlike ASTER imagery, which captures the visual and thermal properties of the Earth's surface, ASTER DEM focuses exclusively on elevation data.

In summary, ASTER and MODIS are remote sensing instruments on NASA's Terra and Aqua satellites, each with its specific spatial resolution and data collection capabilities. ASTER provides high-resolution spectral data, while MODIS offers daily global coverage at moderate spatial resolutions. ASTER DEM, on the other hand, is a specialized product derived from ASTER data that provides detailed elevation information, crucial for terrain analysis and various applications in remote sensing and geospatial analysis.

Comments

Geography of Landslides. Mitigation and Resilience.

A landslide is a geological event in which a mass of rock, earth, or debris moves down a slope under the force of gravity. Landslides can range in size from small to large and can be triggered by natural events such as heavy rainfall, earthquakes, or volcanic activity, or by human activities such as construction or mining. The geography of landslides is affected by a variety of factors that can increase the likelihood of landslides occurring in a particular area. These factors include slope angle and steepness, the type of soil and rock present, the climate and weather patterns of the region, the presence or absence of vegetation, and human activities such as construction, mining, and deforestation. Areas with steep slopes are more prone to landslides because gravity has a stronger effect on loose soil and rock, making it more likely to move downhill. Similarly, areas with loose, sandy soil or weak, fractured rock are more prone to landslides because they are less stable and more easil...

Geography of Flood. Types. Charector.

The geography of floods refers to the characteristics and patterns of floods in different geographic regions. Floods can occur in various landscapes, such as mountains, plains, coastal areas, and urban environments. The geography of a region plays a significant role in determining the frequency, magnitude, and impacts of floods. Some of the factors that influence the geography of floods include: Topography: The shape and elevation of the land can affect the flow and accumulation of water during a flood. For example, flat terrain can lead to slow-moving and widespread flooding, while steep slopes can result in flash floods and landslides. Climate: Regions with high rainfall or snowmelt can experience more frequent and intense floods, while dry regions may experience flash floods due to sudden, heavy rainfall. Hydrology: The characteristics of a river basin, such as its size, shape, and water flow, can influence the severity of a flood. For example, large river basins with extensive floo...

Landslides. USGS

Landslides. TYPES OF LANDSLIDES The term "landslide" describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. The materials may move by falling, toppling, sliding, spreading, or flowing. The animated GIF shows a graphic illustration of different types of landslides, with the commonly accepted terminology describing their features. The various types of landslides can be differentiated by the kinds of material involved and the mode of movement.

Flood prone regions India

Floods are natural disasters characterized by the overflow of water onto normally dry land. Various factors contribute to floods, including intense rainfall, rapid snowmelt, storm surges from coastal storms, and the failure of dams or levees. The geographical explanation involves understanding the key components of flood-prone regions: 1. Proximity to Water Bodies: Flood-prone regions are often situated near rivers, lakes, or coastal areas. These locations are more susceptible to flooding as they are in close proximity to large water sources that can overflow during heavy precipitation or storms. 2. Topography: Low-lying areas with gentle slopes are prone to flooding. Water naturally flows to lower elevations, and flat terrains allow water to accumulate easily. Valleys and floodplains are common flood-prone areas due to their topographical characteristics. 3. Rainfall Patterns: Regions with high and concentrated rainfall are more likely to experience flooding. Intense and prol...

Volcano

Large magma chamber Bedrock Conduit (pipe) Base Sill Dike Layers of ash emitted by the volcano Flank Layers of lava emitted by the volcano Throat Parasitic cone Lava flow Vent Crater Ash cloud

Vineesh V, Geography

Search This Blog