NAME
	WVCal - Radiometrically calibrates WorldView NITF images and outputs ENVI images
	
SYNOPSIS
	WVCal -input file -output file [-imd file] [-outputdatatype type] [-scalefactor factor] [-applyfinetuningcalibration true/false]
	
DESCRIPTION
	Performs radiometric calibration to top of atmosphere radiance for WorldView NITF images and saves resulting images in uncompressed ENVI format. Intended to perform the same function as ENVI's built-in calibration, but at far faster speeds.
	
	WVCal can be run as either a console command or with a GUI. Running with no parameters starts the GUI. Specifying -help displays usage info.
	
	Calibration info is extracted from the NITF file and an accompanying IMD file. The IMD file must have the same base file name as the NITF. If a tar file, rather than IMD, with the NITF base name is present, it will be searched automatically for the first IMD file within it.
	
	Supported formats include:
	WorldView 2 Pan
	WorldView 2 MS 4-band or 8-band
	WorldView 3 Pan
	WorldView 3 MS 4-band or 8-band
	WorldView 3 SWIR 8-band
	(other formats may be supported but are untested)
	
OPTIONS
	-input file
		NITF file to be calibrated.
	
	-output file
		Name of ENVI file to be saved. A header file with file + ".hdr" will also be created.
	
	-imd file
		IMD file to be used for image calibration. Default is the input NITF file name, but with a .IMD extension. If not present, a tar file with the same name will be searched for the first IMD file within.
	
	-outputdatatype type
		Supported types are 4 (float32) or 12 (uint16). Default is 12.
	
	-scalefactor factor
		All output values will be multiplied by factor before saving. This is recorded in the ENVI header as radiance_scale_factor. Default is 1.
	
	-applyfinetuningcalibration
		Applies additional fine-tuning parameters for better calibration to WV2 and WV3 images. Values are from DigitalGlobe document ABSRADCAL_FLEET_2016v0_Rel20170403.pdf. Default is true.