Overview

<aside> ⚠️ This guide is for Spotter 3, for Legacy Spotters please refer to this guide

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Spotter saves data onto its on-board SD card in CSV files. The filename format is:

<log_session_id>_<file_type>.CSV/.LOG

Files are split into numbered "log sessions" to limit the maximum size of individual files and minimize the damage of any file corruption.

All files with the same Log Session ID are concurrent.
Log Session ID will increment on every system boot, as well as when any individual file in the session exceeds 1GB.

This document describes the files and formats saved by Spotter on its SD card. An open-source SD card parsing script is also provided for reference. This script shows an example of how to concatenate log sessions, apply phase correction to time-domain displacement signals, and post-process.

Storage

An SST Spotter in default logging configuration will generate ~12MB of data per day on the SD card ⇒ ~5GB per year. However, certain states like errors or a heavily depleted battery can significantly increase logging volume, so this rate is not guaranteed.

Log average storage sizes can be observed in the table below:

Log Name	Default Size/day (kB)
SYS	2
LOC	51.84
FLT	10800
SPC	290
SST	31
BARO	33
HTU	39
GMN	195
PWR	169
MS	20
CFG	1
ERR	5
GPS.log	70

Total/day (MB)	12.04 AVG

Smart Mooring data will add to this logging volume based on the connected nodes and sampling configuration. For reference, a default 10 sec /60 sec subsample continuous sampling (2) x Sofar Temperature Sensor configuration will produce an additional ~2.5MB of log data per day.

The SD card shipped with the Spotter has a capacity of 16 GB.

Files Types Overview

With default logging configuration, Spotter will log the following file types:

SYS - general system info logging.

LOC - 1-minute time series of geographic coordinates.

FLT - 2.5Hz filtered X/Y/Z wave displacement.

SPC - Spectral analysis output.