Preprocessing requirements

Preprocessing requirements

Before running this module, the following requirements must be met to ensure the job processes successfully and produces accurate results:

• Ingested images: Input scenes must be multispectral or panchromatic orthorectified images or must have been processed using the Orthorectification module.

  Note: Panchromatic data sets are supported only if the corresponding multispectral data set is also available.

  Valid input scenes must follow the standard PCI file-naming convention; that is, supported file names match the pattern *ORTHO_MS.pix.

• Multispectral imagery: Input multispectral imagery must have, at a minimum, a blue or green band and a red band. For haze removal, the imagery must also contain a near-infrared (NIR) band.

• Metadata tags: Creating the masks and removing haze from the image requires the presence of several metadata tags in the multispectral image file. If these tags are unavailable, processing of the job stops.

  The following file-level metadata tags are required :

  • PlatformName
  • Acquisition_DateTime
  • SolarAzimuth
  • AngleOfSolarElevation OR (NominalLocation_Latitude AND NominalLocation_Longitude)
  At channel level, the following metadata tags are required:

  • MinWavelength
  • MaxWavelength
  • WavelengthUnits