How to measure the offset - PIX4Dcatch (Android) with viDoc RTK rover

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When using the viDoc RTK rover with an Android device, the offsets between the antenna and the camera should be set to have precise measurements. Entering these offsets allows PIX4Dcatch to accurately compute the locations received by the viDoc RTK rover with the content captured. 

Mount the device to the viDoc RTK rover

PIX4Dcatch Android RTK measure offset axes diagram

Mounted device illustrating the orientation of axes to measure.

Mount the device to the viDoc RTK rover using the appropriate SP-connect case. Phone cases can be purchased separately from the SP-connect website. The SP-connect universal phone mount can be used if the custom model is unavailable. SP-connect cases are also available in most bicycle and motorcycle shops.

Notate the orientation of the x, y, and z axes and how they relate to the point of origin on the antenna to measure from. The point of origin resides in the middle of the screw mount at the base of the antenna. It will also be necessary to determine which lens to measure from for devices with multiple camera lenses.

 
Tip: If you don't know which camera lens to measure from. Start PIX4Dcatch and then place something in front of each camera lens. The lens blocked is the appropriate lens to measure from.
 
Important: When using the universal mount, the lens and device must be below the antenna when mounting the device to the viDoc.

 PIX4Dcatch_Android_RTK_x_Not_Above_origin.jpg      PIX4Dcatch_Android_RTK_check_Not_Above_origin.jpg

Measure the x-axis

Measure and notate the value from the antenna base to the center of the lens along the axis for the x-axis offset.

PIX4Dcatch Android RTK measure x offset diagram

Diagram: How to measure the x-axis.

Measure the y-axis

Measure and notate the value from the center of the antenna to the center of the lens along the axis for the y-axis offset.

PIX4Dcatch Android RTK measure y offset diagram

Diagram: How to measure the y-axis.

Measure the z-axis

Measure and notate the depth from the center of the antenna to the mobile device's screen for the z-axis offset.

PIX4Dcatch Android RTK measure z offset diagram

Diagram: How to measure the z-axis.

Enter the axis values

With the camera offsets properly measured and notated, they can be input into their appropriate Camera Offset Values (Centimeters/Inches) field of the RTK Device Settings dialog. Depending on the region set in the device, centimeters or inches will be the measurement system used for input.

PIX4Dcatch Android RTK device settings dialog

RTK Device Settings dialog.

The camera's offset has been properly set with the Camera Offset Values (Centimeters/Inches) field populated. Continue with the RTK Device Settings dialog to complete the viDoc RTK connection to the device.

For more information: How to use Pix4Dcatch with viDoc RTK rover.

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