ucar.atd.dorade.DoradePARM Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of cdm Show documentation
Show all versions of cdm Show documentation
The NetCDF-Java Library is a Java interface to NetCDF files,
as well as to many other types of scientific data formats.
The newest version!
/*
* Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.atd.dorade;
import ucar.nc2.constants.CDM;
import java.io.RandomAccessFile;
/* $Id:DoradePARM.java 51 2006-07-12 17:13:13Z caron $ */
public class DoradePARM extends DoradeDescriptor {
/**
* Bad data value flag returned by getParamValues().
*/
public static final float BAD_VALUE = Float.MAX_VALUE;
private String paramName;
private String paramDescription;
private String unitName;
private short usedPRTs;
private short usedFrequencies;
private float rcvrBandwidth; // MHz
private short pulseWidth; // m
private short polarization; // 0 horizontal, 1 vertical, 2 circular,
// 3 elliptical
private short nSamples;
private short binaryFormat; // 1 8-bit integer, 2 16-bit integer,
// 3 24-bit integer, 4 32-bit float,
// 5 16-bit float
/**
* 8-bit signed integer format.
*/
public static final int FORMAT_8BIT_INT = 1;
/**
* 16-bit signed integer format.
*/
public static final int FORMAT_16BIT_INT = 2;
/**
* 32-bit signed integer format.
*/
public static final int FORMAT_32BIT_INT = 3;
/**
* 32-bit IEEE float format.
*/
public static final int FORMAT_32BIT_FLOAT = 4;
/**
* 16-bit IEEE float format.
*/
public static final int FORMAT_16BIT_FLOAT = 5;
private String thresholdParamName;
private float thresholdValue;
private float scale;
private float bias;
private int badDataFlag;
private DoradeRADD myRADD;
public DoradePARM(RandomAccessFile file, boolean littleEndianData,
DoradeRADD radd)
throws DescriptorException {
byte[] data = readDescriptor(file, littleEndianData, "PARM");
myRADD = radd;
//
// unpack
//
paramName = new String(data, 8, 8, CDM.utf8Charset).trim();
paramDescription = new String(data, 16, 40, CDM.utf8Charset).trim();
unitName = new String(data, 56, 8, CDM.utf8Charset).trim();
usedPRTs = grabShort(data, 64);
usedFrequencies = grabShort(data, 66);
rcvrBandwidth = grabFloat(data, 68);
pulseWidth = grabShort(data, 72);
polarization = grabShort(data, 74);
nSamples = grabShort(data, 76);
binaryFormat = grabShort(data, 78);
thresholdParamName = new String(data, 80, 8, CDM.utf8Charset).trim();
thresholdValue = grabFloat(data, 88);
scale = grabFloat(data, 92);
bias = grabFloat(data, 96);
badDataFlag = grabInt(data, 100);
//
// debugging output
//
if (verbose)
System.out.println(this);
}
public String toString() {
String s = "PARM\n";
s += " param name: " + paramName + "\n";
s += " param description: " + paramDescription + "\n";
s += " unit name: " + unitName + "\n";
s += " used PRTs: " + usedPRTs + "\n";
s += " used frequencies: " + usedFrequencies + "\n";
s += " receiver bandwidth: " + rcvrBandwidth + "\n";
s += " pulse width: " + pulseWidth + "\n";
s += " polarization: " + polarization + "\n";
s += " number of samples: " + nSamples + "\n";
s += " binary format: " + binaryFormat + "\n";
s += " threshold parameter: " + thresholdParamName + "\n";
s += " threshold value: " + thresholdValue + "\n";
s += " scale: " + scale + "\n";
s += " bias: " + bias + "\n";
s += " bad data flag: " + badDataFlag;
return s;
}
/**
* Get the name of this parameter.
* @return the name of the parameter
*/
public String getName() {
return paramName;
}
// unidata added
public int getBadDataFlag() {
return badDataFlag;
}
// unidata added
public float getThresholdValue() {
return thresholdValue;
}
// unidata added
public int getPolarization() {
return polarization;
}
// unidata added
public float getScale() {
return scale;
}
// unidata added
public String getUnitName() {
return unitName;
}
// unidata added
public int getusedPRTs() {
return usedPRTs;
}
// unidata added
public int getusedFrequencies() {
return usedFrequencies;
}
// unidata added
public int getnSamples() {
return nSamples;
}
// unidata added
public String getthresholdParamName() {
return thresholdParamName;
}
/**
* Get the units string for this parameter.
* @return the units string
*/
public String getUnits() {
return unitName;
}
/**
* Get the long description for this parameter.
* @return the description string
*/
public String getDescription() {
return paramDescription;
}
/**
* Get the binary format used for encoding this parameter.
* Legal values are:
* FORMAT_8BIT_INT
* FORMAT_16BIT_INT
* FORMAT_32BIT_INT
* FORMAT_16BIT_FLOAT
* FORMAT_32BIT_FLOAT
* @return the binary format for this parameter
*/
public int getBinaryFormat() {
return binaryFormat;
}
/**
* Get the number of cells in a ray.
* @return the number of cells in a ray
*/
public int getNCells() {
return myRADD.getNCells();
}
/**
* Get the cell spacing. An exception is thrown if the cell spacing
* is not constant.
* @return the cell spacing, in meters
* @throws DescriptorException if the cell spacing is not constant.
*/
public float getCellSpacing() throws DescriptorException {
return myRADD.getCellSpacing();
}
/**
* Get the unpacked data values for a selected parameter.
* @param rdat the name of the desired parameter
* @return the unpacked data values for all cells, using BAD_VALUE
* for bad data cells
* @throws DescriptorException
*/
public float[] getParamValues(DoradeRDAT rdat)
throws DescriptorException {
return getParamValues(rdat, null);
}
/**
* Get the unpacked data values for a selected parameter.
* @param rdat the name of the desired parameter
* @param workingArray If non-null and the same length as needed then use this.
* @return the unpacked data values for all cells, using BAD_VALUE
* for bad data cells
* @throws DescriptorException
*/
public float[] getParamValues(DoradeRDAT rdat,float[] workingArray)
throws DescriptorException {
if (! paramName.equals(rdat.getParamName()))
throw new DescriptorException("parameter name mismatch");
byte[] paramData = rdat.getRawData();
int nCells = myRADD.getNCells();
float[] values;
if(workingArray!=null && workingArray.length == nCells) {
values = workingArray;
} else {
values = new float[nCells];
}
short[] svalues = null;
if (myRADD.getCompressionScheme() == DoradeRADD.COMPRESSION_HRD) {
if (binaryFormat != DoradePARM.FORMAT_16BIT_INT) {
throw new DescriptorException("Cannot unpack " +
"compressed data with binary format " +
binaryFormat);
}
svalues = uncompressHRD(paramData, nCells);
}
for (int cell = 0; cell < nCells; cell++) {
switch (binaryFormat) {
case DoradePARM.FORMAT_8BIT_INT:
byte bval = paramData[cell];
values[cell] = (bval == badDataFlag) ?
BAD_VALUE : (bval - bias) / scale;
break;
case DoradePARM.FORMAT_16BIT_INT:
short sval = (svalues != null) ?
svalues[cell] : grabShort(paramData, 2 * cell);
values[cell] = (sval == badDataFlag) ?
BAD_VALUE : (sval - bias) / scale;
break;
case DoradePARM.FORMAT_32BIT_INT:
int ival = grabInt(paramData, 4 * cell);
values[cell] = (ival == badDataFlag) ?
BAD_VALUE : (ival - bias) / scale;
break;
case DoradePARM.FORMAT_32BIT_FLOAT:
float fval = grabFloat(paramData, 4 * cell);
values[cell] = (fval == badDataFlag) ?
BAD_VALUE : (fval - bias) / scale;
break;
case DoradePARM.FORMAT_16BIT_FLOAT:
throw new DescriptorException("can't unpack 16-bit " +
"float data yet");
default:
throw new DescriptorException("bad binary format (" +
binaryFormat + ")");
}
}
return values;
}
/**
* Unpack MIT/HRD-compressed data into an array of exactly nCells shorts.
* @param compressedData the raw HRD-compressed data array
* @return an array of nCells unpacked short values
* @throws DescriptorException
*/
private short[] uncompressHRD(byte[] compressedData, int nCells)
throws DescriptorException {
short[] svalues = new short[nCells];
int cPos = 0; // position in the compressed data, in bytes
int nextCell = 0;
int runLength;
for (;; nextCell += runLength) {
//
// Each run begins with a 16-bin run descriptor. The
// high order bit is set if the run consists of bad flags.
// The remaining 15 bits tell the length of the run.
// A run length of 1 indicates the end of compressed data.
//
short runDescriptor = grabShort(compressedData, cPos);
cPos += 2;
boolean runHasGoodValues = ((runDescriptor & 0x8000) != 0);
runLength = runDescriptor & 0x7fff;
if (runLength == 1)
break;
//
// Sanity check on run length
//
if ((nextCell + runLength) > nCells)
throw new DescriptorException("attempt to unpack " +
"too many cells");
//
// If the run contains good values, then the next runLength
// values in the compressed data stream are real values. Otherwise
// we need to fill with runLength bad value flags.
//
for (int cell = nextCell; cell < nextCell + runLength; cell++) {
if (runHasGoodValues) {
svalues[cell] = grabShort(compressedData, cPos);
cPos += 2;
} else {
svalues[cell] = (short)badDataFlag;
}
}
}
//
// Fill the remainder of the array (if any) with bad value flags
//
for (int cell = nextCell; cell < nCells; cell++)
svalues[cell] = (short)badDataFlag;
return svalues;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy