Using the DAQ Log in MCC

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

The log file created by the DAQ-A can be used in our MAPIR Camera Control (MMC) software to post process the Survey3 images. Simply include it in your MCC input folder path and it will be assessed along with your images. You can include as many log files as you wish, the log events will be matched up with all corresponding images.

Light Sensor Reflectance Calibration 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.