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.
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