VJ103MODLL v021

VIIRS/JPSS1 Moderate Resolution Terrain Corrected Geolocation 6-Min L1 Swath 750 m Light

PI: Guoqing Lin


The Visible Infrared Imaging Radiometer Suite (VIIRS) Moderate Resolution Terrain Correction Geolocation (VJ103MODLL) Version 2.1 product from the NOAA-20 VIIRS sensor is produced in 6 minute temporal satellite increments (swaths) at 750 meter resolution. Intersecting the VIIRS line of sight vector with Earth’s geoid and the World Geodetic System (WGS) ellipsoid, this product is based on the SRTM30 Version 2 digital elevation model (DEM), which uses GTOPO30 data for areas from 60° North to 60° South. VJ103MODLL is a terrain correction geolocation product that provides the spatial location for various VIIRS data products. Each swath of data is approximately 3,060 kilometers along track (long) and 3,060 kilometers across track (wide).

Provided in the VJ103MODLL product are layers for height, latitude, and longitude.

These Science Data Sets (SDS) layers are used in conjunction with the VJ114 swath product for accurate geolocation information.

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Improvements/Changes from Previous Versions

The NOAA-20 VIIRS algorithms include the same improvements as the S-NPP VIIRS V002.

  • Improved calibration algorithm and better coefficients for entire NOAA-20 mission.
  • Improved geolocation accuracy and updates to fix outliers around maneuver periods and other events.
  • Corrections to the aerosol quantity flag (low, average, high) mainly over brighter surfaces in the mid to high latitudes such as desert and tropical vegetation areas. This has an impact on the retrieval of other downstream data products such as VJ113 Vegetation Indices and VJ143 BRDF/Albedo.
  • Improved cloud mask input product for corrections along coastlines and artifacts from use of coarse resolution climatology data.
  • Replaced the land/water mask input product with MODIS heritage seven class land/water mask.

More details can be found in this VIIRS Land V2 Changes document.

Collection and Granule


Characteristic Description
CollectionNOAA-20 VIIRS
File Size~1 MB
Temporal Resolution< Daily
Temporal Extent2018-01-01 to Present
Spatial ExtentGlobal
Coordinate SystemNone (Swath)
File FormatHDF-EOS5
Geographic Dimensions3060 km x 3060 km


Characteristic Description
Number of Science Dataset (SDS) Layers3
Columns/Rows3200 x 3200
Pixel Size750 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Height Terrain height at pixel locations Meters 32-bit floating point N/A N/A N/A N/A
Latitude Latitudes of pixel locations Degree 32-bit floating point N/A N/A N/A N/A
Longitude Longitude of pixel locations Degree 32-bit floating point N/A N/A N/A N/A

¹VJ103MODLL contains height, latitude and longitude SDS layers to be used in conjunction with the VJ114 swath product for accurate geolocation information. The future VJ103 product will include the full suite of SDS layers including the satellite and solar angles.

Product Quality

For complete information about product quality, refer to the VIIRS Land Product Quality Assessment website.

Known Issues

For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.

About the image

VJ103MODLL geolocation product over the western United States on August 23, 2023.

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User Guide
Algorithm Theoretical Basis Document (ATBD)

Using the Data

Access Data


DOI: 10.5067/VIIRS/VJ103MODLL.021