DVOS: Data Variable Object System for Space Plasmas

DVOS current version is 2.1.0

This is a major release with time handling completely revised. Times are now stored in TAI (with leap seconds) to nanosecond accuracy, and conversion to ISO UTC time strings is performed on the fly as needed. String representations are always as UTC strings with leap seconds.

Changes in DVOS version 2.1.0

Uses rigorous nanosec timeing in DvTime with leap seconds

Improve is_regular and assign_regular to use new DvTime

Smaller/faster XML Save/Restore from using nanosec from start time

DVOS provides data object handling for time series data with emphasis on Space Physics data with standard metadata.

Data objects comprise sequences of multi-dimensional arrays of elements, so a single scalar value would have a sequence length of 1 with 1 dimension of size 1.

Elements may be one of the following data types: double, integer, text (DvString), time (DvTime), Time Interval (DvEvent).
A data object will hold data of only one type.

Data objects may have lists of metadata attached, and metadata is also stored as a DVOS object.
Metadata may itself have metadata attached, resulting in a self similar hierarchy.
Metadata is attached through the change_xref() method which prevents infinite regression.

All common mathematical operations are supported on the data, and metadata checking is performed to ensure operations are allowed (e.g. units, coordinate frames). Objects resulting from mathematical operations will have relevant metadata derived
from the input objects.

Joining onto a common timeline is performed on the fly for analysis, but explicit joining methods are also supported.

It uses the standard metadata provided by, for example, Cluster, MMS, and Themis missions to allow it to handle units and coordinate frames, and will join data sensibly onto a common time-line and common units on the fly.

It can save and restore data objects in HTML.

DVOS is written in C++

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Getting DVOS...

Download as source with makefile. Browse download files to DVOS directory and download from there.
Will compile under c++ on Mac OSX, Windows and Linux.

Documentation

DvObjectClass.html provides programmer's documentation on the DVOS library.

Last up-dated 27 February 2017