Aster Digital Elevation Model V004 challenge
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magwizimagdalenar
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Aster Digital Elevation Model V004 challenge
Vertical accuracy Assessment of ASTER DEM V004 challenge by using Ground Control Points in Tanzania (-1N, -12S, 29W,41E). deviation of thousands meters of elevation.
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LP DAAC - jwilson
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- Joined: Mon Sep 30, 2019 12:39 pm America/New_York
Re: Aster Digital Elevation Model V004 challenge
@magwizimagdalenar I will forward your question to our ASTER science team for further investigation.
Please review the User's Guide and Handbook here: https://www.earthdata.nasa.gov/data/catalog/lpcloud-ast14dem-004#documents-and-resources
LP DAAC User Services received your inquiry and will include that information to our science team.
Once I get more guidance, I will let you know.
Thank you,
Janice
Please review the User's Guide and Handbook here: https://www.earthdata.nasa.gov/data/catalog/lpcloud-ast14dem-004#documents-and-resources
LP DAAC User Services received your inquiry and will include that information to our science team.
Once I get more guidance, I will let you know.
Thank you,
Janice
-
LP DAAC - jwilson
- User Services
- Posts: 446
- Joined: Mon Sep 30, 2019 12:39 pm America/New_York
Re: Aster Digital Elevation Model V004 challenge
@magwizimagdalenar We have also replied to your LP DAAC User Services email request.
Please find below the science team response.
Thank you for providing the sample locations and for your patience while we investigated the elevation discrepancies.
We reviewed the sample locations by comparing the elevations from the individual ASTER DEM scenes with your GCP values and the ASTER Mosaic DEM. Our analysis showed that the quality and elevation values can vary among individual ASTER DEM scenes. Some scenes produced elevations that were reasonably consistent with the GCP values, while others returned NoData values or elevations that differed substantially.
This variability is expected because each individual ASTER DEM scene is processed independently. Although the same processing methodology is applied, the quality of the resulting DEM can vary from scene to scene depending on the characteristics of the input stereo imagery, cloud cover, atmospheric conditions, input data quality, and the processing outcome. As a result, differences in elevation accuracy among individual scenes are a known characteristic of the product.
If your application requires a more consistent, high-fidelity elevation product, we recommend using the ASTER Global Digital Elevation Model (ASTER GDEM: https://doi.org/10.5067/ASTER/ASTGTM.003), which is generated from multiple observations and is intended to provide a more spatially consistent elevation dataset.
Please let us know if you have any additional questions.
Best regards,
ASTER Science Team
Please find below the science team response.
Thank you for providing the sample locations and for your patience while we investigated the elevation discrepancies.
We reviewed the sample locations by comparing the elevations from the individual ASTER DEM scenes with your GCP values and the ASTER Mosaic DEM. Our analysis showed that the quality and elevation values can vary among individual ASTER DEM scenes. Some scenes produced elevations that were reasonably consistent with the GCP values, while others returned NoData values or elevations that differed substantially.
This variability is expected because each individual ASTER DEM scene is processed independently. Although the same processing methodology is applied, the quality of the resulting DEM can vary from scene to scene depending on the characteristics of the input stereo imagery, cloud cover, atmospheric conditions, input data quality, and the processing outcome. As a result, differences in elevation accuracy among individual scenes are a known characteristic of the product.
If your application requires a more consistent, high-fidelity elevation product, we recommend using the ASTER Global Digital Elevation Model (ASTER GDEM: https://doi.org/10.5067/ASTER/ASTGTM.003), which is generated from multiple observations and is intended to provide a more spatially consistent elevation dataset.
Please let us know if you have any additional questions.
Best regards,
ASTER Science Team