RE: Units of Measure for use in Math-ML datasets

```Greetings [note that by default replies go to the poster - not the list]:

In JSBSim we are addressing this in our own way (at the moment),
programmatically using an
STL map (indexed by STL strings) to index conversion factors like this:```
```

convert["M"]["FT"] = 3.2808399;
convert["FT"]["M"] = 1.0/convert["M"]["FT"];
convert["M2"]["FT2"] = convert["M"]["FT"]*convert["M"]["FT"];
convert["FT2"]["M2"] = 1.0/convert["M2"]["FT2"];
convert["FT"]["IN"] = 12.0;
convert["IN"]["FT"] = 1.0/convert["FT"]["IN"];
convert["LBS"]["KG"] = 0.45359237;
convert["KG"]["LBS"] = 1.0/convert["LBS"]["KG"];
convert["SLUG*FT2"]["KG*M2"] = 1.35594;
convert["KG*M2"]["SLUG*FT2"] = 1.0/convert["SLUG*FT2"]["KG*M2"];
convert["LBS/FT"]["N/M"] = 14.5939;
convert["LBS/FT/SEC"]["N/M/SEC"] = 14.5939;
convert["N/M"]["LBS/FT"] = 1.0/convert["LBS/FT"]["N/M"];
convert["N/M/SEC"]["LBS/FT/SEC"] = 1.0/convert["LBS/FT/SEC"]["N/M/SEC"];

convert["M"]["M"] = 1.00;
convert["FT"]["FT"] = 1.00;
convert["IN"]["IN"] = 1.00;
convert["IN3"]["IN3"] = 1.00;
convert["DEG"]["DEG"] = 1.00;
convert["M2"]["M2"] = 1.00;
convert["FT2"]["FT2"] = 1.00;
convert["KG*M2"]["KG*M2"] = 1.00;
convert["SLUG*FT2"]["SLUG*FT2"] = 1.00;
convert["KG"]["KG"] = 1.00;
convert["LBS"]["LBS"] = 1.00;
convert["LBS/FT"]["LBS/FT"] = 1.00;
convert["N/M"]["N/M"] = 1.00;
convert["LBS/FT/SEC"]["LBS/FT/SEC"] = 1.00;
convert["N/M/SEC"]["N/M/SEC"] = 1.00;
convert["PSI"]["PSI"] = 1.00;
convert["INHG"]["INHG"] = 1.00;
convert["HP"]["HP"] = 1.00;

Since this is only done at initialization time, CPU usage is not so critical
for us. I'd
be interested in hearing more about standard unit abbrev.s, though.

Jon Berndt

```