Using the DAQ Log in Chloros

This page describes how to use the DAQ log in post processing

The .daq log file created by the DAQ-A can be used in our Chloros software to post process the Survey3 images. Simply add it to you Chloros project along with your input image files. You can include as many log files as you wish, the log events will be matched up with all corresponding images.

Light Sensor Reflectance Corrections (S Models)

As the light changes the spectrometer inside the DAQ-A-S models will record the changing light spectrum. Measurement values range from 340-1010nm, at every 5nm increment.

Each time an image of our Diffuse Reflectance Standard Calibration Target Packages is used for calibration it will reset the reflectance calibration baseline, which is further corrected by the light sensor measurement over time.

Post Process Kinematic (PPK) Corrections

The exposure pulse log events can be used to correct the positional data of the images. If the cameras are moving while capturing images then there can be a difference in time (~100ms) between the image GNSS metadata recording and the actual location at the sensor exposure. By recording the GNSS and IMU at the exposure moment we can improve the location accuracy of the image metadata in post processing.

Even though the PWM trigger pulse was sent to both Survey3 cameras at the same time, the exposure pulse received back from the cameras averages a 40ms difference, and can be as much as 160ms. So using PPK will create different GNSS locations for the images, since they were captured at different times. PPK corrections are most important when the camera is moving, such as an aerial mapping survey.

NEW in Firmware v1.03: Automatic PPK Calibration

Firmware v1.03 introduces a revolutionary machine learning auto-calibration system that automatically learns and corrects timing offsets between DAQ events and camera exposures:

• Sub-millisecond precision - Achieves ±0.043ms timing accuracy for professional PPK workflows

• Zero manual setup - No offset calculations or manual calibration required

• Automatic learning - The system learns timing patterns during capture and applies corrections in real-time

• Independent per camera - Each camera (Pin 1 and Pin 2) learns its own timing characteristics

• Embedded in data - All calibration information is stored directly in the .daq file for full traceability

The auto-calibration data is automatically included in the DAQ log file and will be used by Chloros for the most accurate PPK corrections possible.