Product types

Several STEC/VTEC products are available on our server:

  1. Daily raw STEC data, sampled every 30 seconds.
  2. Daily VTEC maps: The map extensions are:

Map area

Nomenclature

The general product nomenclature is:

AB_YYYY_MM_DD.cdf

The meanings of the fields are:

A Type of the product:
T: raw product (STEC)
M: map product (VTEC)
B Time sampling of the product:
H: 1 hour
V: 15 minutes
L: 30 seconds
S: 1 second (only available on demand for specific studies)
YYYY Year of the GPS data used for the product creation
MM Month of the GPS data used for the product creation
DD Day of the GPS data used for the product creation

Formats

Products are delivered in the netCDF format (platform independent format). The netCDF format is recognized by many scientific software and is also easily read by users' programs calling the netCDF library (see the Unidata web site for details).
The product formats are described hereafter.

Raw products

A detailed description of the raw product format can be found here.
Note that VTEC data at the SIP can be obtained using the formula:
VTEC = ( STEC - TGD - IFB ) * Obliquity

VTEC maps

A detailed description of the VTEC map format can be found here.

Filtered VTEC maps

Detailed descriptions of the filtered VTEC maps can be seen here (15 minute filtered map) and there (1 hour filtered map).

Data volume

Below are reported typical product sizes.

Product Original size
(MBytes)
Gzipped
(MBytes)
Raw 300 150
Map 46 10
15 minute map 38 1.6
1 hour map 37 1.4


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