private static boolean isNearRangeOnLeft(final Product product) {
final TiePointGrid incidenceAngle = product.getTiePointGrid("incident_angle");
if (incidenceAngle != null) {
final double incidenceAngleToFirstPixel = incidenceAngle.getPixelDouble(0, 0);
final double incidenceAngleToLastPixel =
incidenceAngle.getPixelDouble(product.getSceneRasterWidth() - 1, 0);
return (incidenceAngleToFirstPixel < incidenceAngleToLastPixel);
} else {
return true;
}
}
private static void updateMetadata(
final Product sourceProduct, final Product targetProduct, ProductSubsetDef subsetDef)
throws IOException {
try {
final MetadataElement root = targetProduct.getMetadataRoot();
if (root == null) return;
final MetadataElement absRoot = root.getElement("Abstracted_Metadata");
if (absRoot == null) return;
boolean nearRangeOnLeft = isNearRangeOnLeft(targetProduct);
final MetadataAttribute firstLineTime = absRoot.getAttribute("first_line_time");
if (firstLineTime != null) {
final ProductData.UTC startTime = targetProduct.getStartTime();
if (startTime != null) firstLineTime.getData().setElems(startTime.getArray());
}
final MetadataAttribute lastLineTime = absRoot.getAttribute("last_line_time");
if (lastLineTime != null) {
final ProductData.UTC endTime = targetProduct.getEndTime();
if (endTime != null) lastLineTime.getData().setElems(endTime.getArray());
}
final MetadataAttribute totalSize = absRoot.getAttribute("total_size");
if (totalSize != null) totalSize.getData().setElemUInt(targetProduct.getRawStorageSize());
if (nearRangeOnLeft) {
setLatLongMetadata(targetProduct, absRoot, "first_near_lat", "first_near_long", 0.5f, 0.5f);
setLatLongMetadata(
targetProduct,
absRoot,
"first_far_lat",
"first_far_long",
targetProduct.getSceneRasterWidth() - 1 + 0.5f,
0.5f);
setLatLongMetadata(
targetProduct,
absRoot,
"last_near_lat",
"last_near_long",
0.5f,
targetProduct.getSceneRasterHeight() - 1 + 0.5f);
setLatLongMetadata(
targetProduct,
absRoot,
"last_far_lat",
"last_far_long",
targetProduct.getSceneRasterWidth() - 1 + 0.5f,
targetProduct.getSceneRasterHeight() - 1 + 0.5f);
} else {
setLatLongMetadata(
targetProduct,
absRoot,
"first_near_lat",
"first_near_long",
targetProduct.getSceneRasterWidth() - 1 + 0.5f,
0.5f);
setLatLongMetadata(targetProduct, absRoot, "first_far_lat", "first_far_long", 0.5f, 0.5f);
setLatLongMetadata(
targetProduct,
absRoot,
"last_near_lat",
"last_near_long",
targetProduct.getSceneRasterWidth() - 1 + 0.5f,
targetProduct.getSceneRasterHeight() - 1 + 0.5f);
setLatLongMetadata(
targetProduct,
absRoot,
"last_far_lat",
"last_far_long",
0.5f,
targetProduct.getSceneRasterHeight() - 1 + 0.5f);
}
final MetadataAttribute height = absRoot.getAttribute("num_output_lines");
if (height != null) height.getData().setElemUInt(targetProduct.getSceneRasterHeight());
final MetadataAttribute width = absRoot.getAttribute("num_samples_per_line");
if (width != null) width.getData().setElemUInt(targetProduct.getSceneRasterWidth());
final MetadataAttribute offsetX = absRoot.getAttribute("subset_offset_x");
if (offsetX != null && subsetDef.getRegion() != null)
offsetX.getData().setElemUInt(subsetDef.getRegion().x);
final MetadataAttribute offsetY = absRoot.getAttribute("subset_offset_y");
if (offsetY != null && subsetDef.getRegion() != null)
offsetY.getData().setElemUInt(subsetDef.getRegion().y);
final MetadataAttribute slantRange = absRoot.getAttribute("slant_range_to_first_pixel");
if (slantRange != null) {
final TiePointGrid srTPG = targetProduct.getTiePointGrid("slant_range_time");
if (srTPG != null) {
final double slantRangeTime;
if (nearRangeOnLeft) {
slantRangeTime = srTPG.getPixelDouble(0, 0) / 1000000000.0; // ns to s
} else {
slantRangeTime =
srTPG.getPixelDouble(targetProduct.getSceneRasterWidth() - 1, 0)
/ 1000000000.0; // ns to s
}
final double halfLightSpeed = 299792458.0 / 2.0;
final double slantRangeDist = slantRangeTime * halfLightSpeed;
slantRange.getData().setElemDouble(slantRangeDist);
}
}
setSubsetSRGRCoefficients(sourceProduct, targetProduct, subsetDef, absRoot, nearRangeOnLeft);
} catch (Exception e) {
throw new IOException(e);
}
}