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MOD09A1 - MODIS/Terra Surface Reflectance 8-Day L3 Global 500m SIN Grid

Update Frequency: As Needed
Latest Data Update: 2023-05-17
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2021-04-15
Download Stats: last 12 months
Dataset Size: 169.12K Files | 10TB


These data are a copy of MODIS data from the NASA Level-1 and Atmosphere Archive & Distribution System (LAADS) Distributed Active Archive Center (DAAC). The copy is potentially only a subset. Below is the description from

Shortname: MOD09A1 , Platform: Terra , Instrument: MODIS , Processing Level: Level-3 , Spatial Resolution: 500 m , Temporal Resolution: 8 day , ArchiveSets: 61, 6 , Collection: MODIS Collection 6.1 - Level 1, Atmosphere, Land (ArchiveSet 61) , PGE Number: PGE21

Citable as:  National Aeronautics and Space Administration (2021): MOD09A1 - MODIS/Terra Surface Reflectance 8-Day L3 Global 500m SIN Grid. National Aeronautics and Space Administration, date of citation.
Abbreviation: MOD09A1
Keywords: Not defined


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were downloaded from to support UK research groups, especially NCEO.

Data Quality:
Look on the data source site ( for quality information
File Format:

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Mobile platform operations

Mobile Platform Operation 1 Terra Satellite orbit details
Output Description


  • units: degree
  • var_id: sur_refl_raz
  • long_name: Relative_azimuth
  • units: degree
  • var_id: sur_refl_szen
  • long_name: Solar_zenith
  • units: bit field
  • var_id: sur_refl_qc_500m
  • long_name: Surface_reflectance_500m_quality_control_flags
  • units: bit field
  • var_id: sur_refl_state_500m
  • long_name: Surface_reflectance_500m_state_flags
  • units: Julian day
  • var_id: sur_refl_day_of_year
  • long_name: Surface_reflectance_day_of_year
  • units: reflectance
  • var_id: sur_refl_b01
  • long_name: Surface_reflectance_for_band_1
  • units: reflectance
  • var_id: sur_refl_b02
  • long_name: Surface_reflectance_for_band_2
  • units: reflectance
  • var_id: sur_refl_b03
  • long_name: Surface_reflectance_for_band_3
  • units: reflectance
  • var_id: sur_refl_b04
  • long_name: Surface_reflectance_for_band_4
  • units: reflectance
  • var_id: sur_refl_b05
  • long_name: Surface_reflectance_for_band_5
  • units: reflectance
  • var_id: sur_refl_b06
  • long_name: Surface_reflectance_for_band_6
  • units: reflectance
  • var_id: sur_refl_b07
  • long_name: Surface_reflectance_for_band_7
  • units: degree
  • var_id: sur_refl_vzen
  • long_name: View_zenith

Co-ordinate Variables

Temporal Range
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Geographic Extent