The Sensors model provides a way to group MediaFiles by which microphone (Sensor) they were collected with, and store some basic information about the sensor, namely location. In addition, this supports the ‘SensorArray Layout’ display in the visualizeMultiProjectFile page.

Sensors and SensorArrays are contained within Libraries.


Adding / Editing Sensors and Arrays

Sensors are accessed from within the Library page. From the User Home Page, click Libraries and select a Library. From there, either View an existing Library or add a new one.

The top of the screen displays the Sensors in the array, and the bottom allows adding new Sensors. The main feature is the layout grid in the middle.

On the visualizeMultiProjectFile, the SensorArray Layout can be selected, which displays files based on location. The layout grid here is used to define these locations.

First, select the number of rows and columns to use in the grid, and click ‘Update Grid’. Drag and drop the various sensors into the layout grid; once done, click the ‘Save to Database’ button to save the layout.



A Sensor is comprised of:

Unique integer id (internally generated)

Text name assigned to the Sensor by the user.

Common naming schemes will take into account the location of the Sensor. For example, in a diamond grid, perhaps “North”, “South”, “East”, and “West”.

Which SensorArray is this Sensor part of.

An x, y, and z value assigned to the Sensor. This is (currently) not used by ARLO.

Note: The x,y,z coordinates are stored in the database as unit-less floats. However, assumptions will likely be made about these coordinates in processing. At a minimum, these should likely be a Cartesian coordinate system. I propose that these always be stored in meters, preferably UTM for geographic datum – TonyB

Layout Coordinate
The layoutRow and layoutColumn - the position to use in the Layout grid when displaying files by location (in visualizeMultiProjectFile).

Perhaps in the future, this will expand. Items such as microphone / recorder type, and non-audio specific sensors (for images / videos).


A SensorArray defines a group of Sensors. Sensors within this array are assignable to any MediaFiles within the same Library.

Unique integer id (internally generated)
Text name assigned by the user.
The number of Rows to use in the Layout grid when displaying files by location.
The number of Columns to use in the Layout grid when displaying files by location.

Layout Details

The layout works by creating a grid of rows and columns, as specified by layoutRows and layoutColumns respectively in the SensorArray.

Each Sensor has a layoutRow and layoutColumn value; these are zero-based indexes in the grid, so a 5x5 grid can have coordinates from (0,0) to (4,4).

Sensors that are to be excluded from the layout should have a Row and Column of (-1).