The DQN product is a binary output, as you guessed. The actual format can be found in the DPIS ICD Volume 3 section 3.3.5.8, or one can see the format of the structure by opening $ADL_HOME/xml/VIIRS/DQN_INFO.xml with a browser so that the XML file is displayed with the style sheet. I've uploaded a screen shot which shows the summary of the format. It's basically made up of 3 "granule" level fields, then followed by 15 records which are slots for the individual tests that are triggered.
I was going to upload a simple program that we have in development to convert them to ASCII, however it seems I can't upload C++ files to this site. Therefore I'll just paste the code in here which you can paste into a file such as parseDQN.cpp and compile it. I'm guessing this is basically what you are looking for. If not post back.
It should compile with g++ parseDQN.cpp -I $ADL_HOME/include
Bryan Henderson
Raytheon Company
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#include <cstring>
#include <stdio.h>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
using namespace std;
#include <ProCmnQuality.h>
int main(int argc, char** argv)
{
ProCmnDQNHeader dqn;
ProCmnDQNRecord dqnRecord;
if (argc != 2)
{
cout << "Usage : " << argv[0] << " <DQNfile>" << endl;
exit (-1);
}
string fileName(argv[1]);
ifstream inputFile(fileName.data(), ios::binary | ios::in);
if (!inputFile.good())
{
if (!inputFile.is_open())
{
cerr << "Unable to open input file : " << fileName.data() << endl;
}
else
{
cerr << "Errors with input file " << fileName.data();
cerr << ", state=" << inputFile.rdstate() << endl;
}
return(-1);
}
// go the beginning of the file and read in the data
inputFile.seekg(0, ios::beg);
inputFile.read((char *) &dqn, sizeof(dqn));
if (dqn.testCount <= 0)
{
cerr << "Invalid number of tests (" << dqn.testCount << ") in dqn: " << fileName.c_str() << endl;
inputFile.close();
return (-1);
}
cout << fileName.data() << " has " << dqn.testCount << " test entries" << endl;
for (int i = 0; i < dqn.testCount; i++)
{
memset((void *) &(dqnRecord), 0, sizeof(dqnRecord));
inputFile.read((char *) &(dqnRecord), sizeof(dqnRecord));
cout << "------------------------------------------" << endl;
cout << "Test ID : " << dqnRecord.testID << endl;
cout << "Minimum Value : " << dqnRecord.valueMin << endl;
cout << "Maximum Value : " << dqnRecord.valueMax << endl;
cout << "Thresholds Count : " << dqnRecord.thresholdTestCount << endl;
cout << "Thresholds Result: " << dqnRecord.thresholdTestResults << endl;
cout << "Severity Level : " << dqnRecord.severityLevel << endl;
cout << "DQN Information : " << dqnRecord.dqnInfo << endl;
cout << "The version of the DQN : " << dqn.dqttVersion << endl;
}
inputFile.close();
return(1);
}
