This page provides access to the first data release (DR1) of the LOFAR Decametre Sky Survey (LoDeSS). The release contains 40 fields observed between 15 and 30 MHz, together with source and Gaussian-component catalogues and mosaics of overlapping fields where possible. Typical noise levels are 11.5 mJy beam^-1.

Data quality varies across the release. Some fields are affected by stronger ionospheric distortions, which can lead to significant flux-density uncertainties. Fields are therefore classified as good, mediocre, or poor, and poor-quality fields are excluded from the final source catalogue.

Please consult the LoDeSS DR1 paper (Cordun et al in press) before using the data, especially for field-specific quality information and known limitations.

Catalogues

• Source catalogue
• Gaussian catalogue

Example mosaics

• 3-field mosaic (P128+36, P136+30, P136+36)
• 5-field mosaic (P210+80, P222+74, P246+74, P249+80, P264+86)

Individual fields