private void readCalibrationCoefficients(int rawY, int[] calibCoeff) throws IOException {
CompoundData dataRecord = noaaFile.getDataRecord(rawY);
SequenceData calibration_coefficients = dataRecord.getSequence("CALIBRATION_COEFFICIENTS");
for (int i = 0; i < calibCoeff.length; i++) {
calibCoeff[i] = calibration_coefficients.getInt(i);
}
}
private boolean hasData(int rawY) throws IOException {
if (channel != AvhrrConstants.CH_3A && channel != AvhrrConstants.CH_3B) {
return true;
}
final int bitField = noaaFile.getScanlineBitfield(rawY);
final int channel3ab = bitField & 3;
return (channel3ab == 1 && channel == AvhrrConstants.CH_3A)
|| (channel3ab == 0 && channel == AvhrrConstants.CH_3B);
}
@Override
public synchronized void readBandRasterData(
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
int sourceStepX,
int sourceStepY,
ProductData destBuffer,
ProgressMonitor pm)
throws IOException {
AvhrrFile.RawCoordinates rawCoord =
noaaFile.getRawCoordinates(sourceOffsetX, sourceOffsetY, sourceWidth, sourceHeight);
final float[] targetData = (float[]) destBuffer.getElems();
int targetIdx = rawCoord.targetStart;
pm.beginTask("Reading AVHRR band '" + getBandName() + "'...", rawCoord.maxY - rawCoord.minY);
try {
for (int rawY = rawCoord.minY; rawY <= rawCoord.maxY; rawY += sourceStepY) {
if (pm.isCanceled()) {
break;
}
boolean validData = hasData(rawY);
if (validData) {
if (calibrator.requiresCalibrationData()) {
readCalibrationCoefficients(rawY, calibrationData);
validData = calibrator.processCalibrationData(calibrationData);
}
if (validData) {
readData(rawY);
validData = containsValidCounts();
if (validData) {
for (int sourceX = rawCoord.minX; sourceX <= rawCoord.maxX; sourceX += sourceStepX) {
targetData[targetIdx] = calibrator.calibrate(lineOfCounts[sourceX]);
targetIdx += rawCoord.targetIncrement;
}
}
}
}
if (!validData) {
for (int sourceX = rawCoord.minX; sourceX <= rawCoord.maxX; sourceX += sourceStepX) {
targetData[targetIdx] = AvhrrConstants.NO_DATA_VALUE;
targetIdx += rawCoord.targetIncrement;
}
}
pm.worked(1);
}
} finally {
pm.done();
}
}
