SLR Data Handling File: ILRS Network Eccentricities and Corrections for ITRF2020

ILRS network eccentricity data defines offsets, usually less than 15 meters, from ground monuments to the optical reference points of mobile Satellite Laser Ranging systems. This dataset includes corrections to SLR tracking data from CDDIS tables, resolutions from ILRS/ASC meetings, and results from the Station Systematic Error Monitoring (SSEM) project and its 2023 extension. It supports the extension of the International Terrestrial Reference Frame 2020 model with additional SLR sites.

Use Cases

• Calculating precise station coordinates for the ITRF2020 model based on monument and system eccentricity definitions.
• Applying corrections to SLR tracking data for improved accuracy in satellite orbit determination.
• Monitoring systematic errors at ILRS stations using results from the SSEM and SSEM-X projects.
• Distinguishing between mobile and permanent SLR systems for network analysis based on their assigned CDP and DOMES numbers.

Strengths

• Cross-platform presence on NASA EarthData and Data.gov signals established importance and curation.
• Includes results from long-term monitoring projects like SSEM, which ran from at least 2008 to 2023.
• Provides specific technical definitions for system eccentricities, detailing measurement in North, East, Up or X, Y, Z coordinates.

Limitations

• Critical metadata is missing: column names, row counts, and file sizes are unknown across all sources.
• The license is ambiguously listed as 'other-license-specified' without a clear identifier.
• One source (nasa_earthdata) lists a last update of 2026-04-09, which is a future date, indicating a potential metadata error.

Provenance

Source

CDDIS (Crustal Dynamics Data Information System)

Collection Method

Compiled from various tables on CDDIS, ILRS/ASC meeting resolutions, the T2L2 @ Jason-2 project, and the SSEM/SSEM-X projects.

Time Range

Includes data from at least July 2008 (T2L2 project start) through the 2023 SSEM extension.

Freshness

2026-04-09 22:39:31.831256

Geography

Global, covering the International Laser Ranging Service (ILRS) network sites.