Description

The Hotshoe/flash sync layer allows the GEOSTIX to record both the exact timestamp of the photo and its precise position as well as the orientation of the camera-GEOSTIX system in space.

This layer is designed to be mounted on the hotshoe of any camera equipped with a standard flash socket.

How it works

Each photo taken by the camera sends a pulse — or more precisely, a brief low signal (GND).

The GEOSTIX equipped with the layer hotshoe captures this signal and records:

• the exact time with sub-microsecond accuracy,
• the position,
• the orientation provided by the GEOSTIX’s IMU.

The data is saved onto the microSD card located under the GEOSTIX and accessible via USB connection.

The log file is named EXTEVENT.LOG and contains several fields described below:

Variable Name	Description
TimeOfWeek	GPS time of week, starts Sunday at 00:00:00.00 convert
WeekNumber	GPS week number convert
FixStatus	”R” => RTK FIX / “F” => RTK FLOAT / “S” => SINGLE / “D” => DGNSS / “N” => NO FIX
Lat	Latitude (°)
Lon	Longitude (°)
Height	Height above ellipsoid (m)
HAccuracy	Horizontal accuracy
VAccuracy	Vertical accuracy
OrientationX
OrientationY
OrientationZ
Support1	Debug info
Support2	Debug info

example from an extevent.log file

222708.445229,2285,"R",45.519933813,6.680457525,1738.724,0.04,0.05,0.3585647,-0.0514448,0.1724559,0,0
222716.363965,2285,"R",45.519925443,6.680454741,1738.727,0.04,0.05,0.3569530,-0.0224424,0.1067406,0,0
222721.165234,2285,"R",45.519917662,6.680453892,1738.713,0.05,0.07,0.3663970,-0.0107033,0.0703658,0,0

MECHANICAL
Height to account for (layer)	TBD
Weight	40 g
POWER CONSUMPTION
In operation	0 (mW)