30  VIIRS footprint

VIIRS footprint table contains information on the area observed by the VIIRS satellite (Suomi-NPP). The data is obtained from NASA LAADS.

30.1 Repository

https://github.com/GlobalFishingWatch/viirs-footprint

30.2 Key tables

Current version

  • scratch_masaki.viirs_footprint_granule_v20210208

Older version

non

31 Data descriptions

Each record of this table can be distinguished by GranuleID and a single record (granule) represents 6 minutes time window of VIIRS scan. The shape of the granule is contained in the wkt column (Well Known Text format). The DayNightFlag contains the information on whether the granule was scanned at night (N), day (D), or day/night boundary (B), and VIIRS boat detection only present in N and B.

  • GranuleID : Unique id for each records (granules)
  • StartDateTime : Start datetime of this granule.
  • MidDateTime : Median datetime of this granule (StartDateTime + 3 minutes).
  • EndDateTime : End datetime of this granule (StartDateTime + 6 minutes).
  • date : Date at StartDateTime
  • OrbitNumber : OrbitNumber of this granule
  • DayNightFlag : day/night information of this granule, night (N), day (D) or day/night boundary (B).
  • wkt : The shape of this granule in WKT format.
  • NorthBoundingCoord : North bound latitude of this granule
  • SouthBoundingCoord : South bound latitude of this granule
  • EastBoundingCoord : East bound longitude of this granule
  • WestBoundingCoord : West bound longitude of this granule
  • GRingLongitude1 : Longitude of vertex_1 of this granule
  • GRingLongitude2 : Longitude of vertex_2 of this granule
  • GRingLongitude3 : Longitude of vertex_3 of this granule
  • GRingLongitude4 : Longitude of vertex_4 of this granule
  • GRingLatitude1 : Latitude of vertex_1 of this granule
  • GRingLatitude2 : Latitude of vertex_2 of this granule
  • GRingLatitude3 : Latitude of vertex_3 of this granule
  • GRingLatitude4 : Latitude of vertex_4 of this granule

The wkt was created by connecting four GRing vertices using great circle line.

32 Caveats & Known Issues

33 Example queries