/**
* Retrieve required data from Abstracted Metadata
*
* @throws Exception if metadata not found
*/
private void getMetadata() throws Exception {
srgrFlag = AbstractMetadata.getAttributeBoolean(absRoot, AbstractMetadata.srgr_flag);
wavelength = SARUtils.getRadarFrequency(absRoot);
rangeSpacing = AbstractMetadata.getAttributeDouble(absRoot, AbstractMetadata.range_spacing);
firstLineUTC = absRoot.getAttributeUTC(AbstractMetadata.first_line_time).getMJD(); // in days
lastLineUTC = absRoot.getAttributeUTC(AbstractMetadata.last_line_time).getMJD(); // in days
lineTimeInterval =
absRoot.getAttributeDouble(AbstractMetadata.line_time_interval)
/ Constants.secondsInDay; // s to day
orbitStateVectors = AbstractMetadata.getOrbitStateVectors(absRoot);
if (srgrFlag) {
srgrConvParams = AbstractMetadata.getSRGRCoefficients(absRoot);
} else {
nearEdgeSlantRange =
AbstractMetadata.getAttributeDouble(absRoot, AbstractMetadata.slant_range_to_first_pixel);
}
final TiePointGrid incidenceAngle = OperatorUtils.getIncidenceAngle(sourceProduct);
nearRangeOnLeft = SARGeocoding.isNearRangeOnLeft(incidenceAngle, sourceImageWidth);
}
