Quantity Codes

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Quantity Codes

The quantity codes are used in the OBJDESC.VARTYPE, DESCRIP0.VARTYPE, DESCRIP1.DESTYPE, DESCRIP2.DESTYPE, DESCRIP3.DESTYPE, and DESCRIP.DESTYPE record fields to describe what physical quantity the data or its dimensions represent. Each code is stored in an integer at least 32 bits long. This integer is expressed as a sequence of eight 4-bit nybbles, numbered from 0 to 7, the most significant nybble in the integer being number 0.

The quantity code format is as follows:

group

is a broad collection of quantities that have some relationship to a particular discipline

00 :: General
01-0F :: Geophysical
10-1F :: Chemical
20-2F :: Astronomical
77 :: Site-defined quantities (explained in Section A.2.4)

General group

$\begin{picture}(40,2) \multiput(0,0)(10,0){5}{\line(0,1){2}} \put(0,2){\line(1... ...\put(20,0){\makebox(10,2){type}} \put(30,0){\makebox(10,2){code}} \end{picture}$

Atmospheric Science group

$\begin{picture}(40,2) \put(0,0){\line(0,1){2}} \put(10,0){\line(0,1){2}} \put... ...\put(15,0){\makebox(10,2){type}} \put(25,0){\makebox(15,2){code}} \end{picture}$

Chemical Constituent group

$\begin{picture}(40,2) \put(0,0){\line(0,1){2}} \put(10,0){\line(0,1){2}} \put... ... \put(20,0){\makebox(5,2){type}} \put(25,0){\makebox(15,2){code}} \end{picture}$

Astronomical general group

$\begin{picture}(40,2) \multiput(0,0)(10,0){5}{\line(0,1){2}} \put(0,2){\line(1... ...\put(20,0){\makebox(10,2){type}} \put(30,0){\makebox(10,2){code}} \end{picture}$

Next: Unit Codes Up: Centrally Defined Codes Previous: Site Identifier Codes Contents

Eric Nash 2003-09-25