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The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1
Precision Terrain Corrected Registered At-Sensor Radiance (AST_L1T) data contains
calibrated at-sensor radiance, which corresponds with the ASTER Level 1B (AST_L1B),
that has been geometrically corrected, and rotated to a north-up UTM projection.
The AST_L1T is created from a single resampling of the corresponding ASTER L1A (AST_L1A) product.
The precision terrain correction process incorporates GLS2000 digital elevation data with
derived ground control points (GCPs) to achieve topographic accuracy for all daytime scenes
where correlation statistics reach a minimum threshold. Alternate levels of correction are
possible (systematic terrain, systematic, or precision) for scenes acquired at night or that
otherwise represent a reduced quality ground image (e.g., cloud cover).
Each AST_L1T granule is converted into three different COG files based on the sensor and spatial resolution,
VNIR at 15m, SWIR [...]
Overview
The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1 Precision Terrain Corrected Registered At-Sensor Radiance (AST_L1T) data contains calibrated at-sensor radiance, which corresponds with the ASTER Level 1B (AST_L1B), that has been geometrically corrected, and rotated to a north-up UTM projection. The AST_L1T is created from a single resampling of the corresponding ASTER L1A (AST_L1A) product.
The precision terrain correction process incorporates GLS2000 digital elevation data with derived ground control points (GCPs) to achieve topographic accuracy for all daytime scenes where correlation statistics reach a minimum threshold. Alternate levels of correction are possible (systematic terrain, systematic, or precision) for scenes acquired at night or that otherwise represent a reduced quality ground image (e.g., cloud cover).
Each AST_L1T granule is converted into three different COG files based on the sensor and spatial resolution, VNIR at 15m, SWIR at 30m and TIR at 90m. The metadata required to transform the digital numbers (DN) to radiance and reflectance values are also incorporated as metadata in the TIFF files. The filenaming convention and the organization of bands are described here .
Features and programs
Open Data Sponsorship Program
This dataset is part of the Open Data Sponsorship Program, an AWS program that covers the cost of storage for publicly available high-value cloud-optimized datasets.
Pricing
This is a publicly available data set. No subscription is required.
Legal
Content disclaimer
Vendors are responsible for their product descriptions and other product content. AWS does not warrant that vendors' product descriptions or other product content are accurate, complete, reliable, current, or error-free.
Delivery details
AWS Data Exchange (ADX)
AWS Data Exchange is a service that helps AWS easily share and manage data entitlements from other organizations at scale.
Open data resources
Available with or without an AWS account.
- How to use
- To access these resources, reference the Amazon Resource Name (ARN) using the AWS Command Line Interface (CLI). Learn more
- Description
- Imagery and metadata
- Resource type
- S3 bucket
- Amazon Resource Name (ARN)
- arn:aws:s3:::aster-l1t
- AWS region
- us-west-2
- AWS CLI access (No AWS account required)
- aws s3 ls --no-sign-request s3://aster-l1t/
- Description
- [New image notifications](https://github.com/awslabs/open-data-docs/tree/main/docs/aster-l1t#receive-data-notifications-with-amazon-sns)
- Resource type
- SNS topic
- Amazon Resource Name (ARN)
- arn:aws:sns:us-west-2:526859492376:aster-l1t-object_created
- AWS region
- us-west-2
Resources
Vendor resources
Support
Contact
Managed By
How to cite
ASTER L1T Cloud-Optimized GeoTIFFs was accessed on DATE from https://registry.opendata.aws/aster-l1t .
License
There are no restrictions on the use of data, unless expressly identified prior to or at the time of receipt.
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The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1 Precision Terrain Corrected Registered At-Sensor Radiance (ASTL1T) data contains calibrated at-sensor radiance, which corresponds with the ASTER Level 1B (ASTL1B) that has been geometrically corrected and rotated to a north-up UTM projection. The ASTL1T is created from a single resampling of the corresponding ASTER L1A (ASTL1A) product. The bands available in the ASTL1T depend on the bands in the ASTL1A and can include up to three Visible and Near Infrared (VNIR) bands, six Shortwave Infrared (SWIR) bands, and five Thermal Infrared (TIR) bands. The ASTL1T dataset does not include the aft-looking VNIR band 3. The ASTL1T product has a spatial resolution of 15 meters (m) for the VNIR bands, 30 m for the SWIR bands, and 90 m for the TIR bands.
The precision terrain correction process incorporates GLS[...]
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