DAQ-A

The DAQ-A is an aerodynamic PPK data logger containing GNSS (GPS) and IMU position sensors, with a user-accessible memory card for saving the data log. The DAQ-A-SD adds an integrated, downwelling SPECTROMETER which records the changing ambient light spectrum (340 - 1010 nm) to assist with calibrating Survey3 camera images. There is a USB port for power input, an RGB LED status button and two Survey3 camera connection ports (power + signals).

PPK

Post Process Kinematics (GNSS+IMU)

Improves Image Location Metadata

Due to Camera Shutter Lag

ublox MAX-M10S GNSS

Integrated Antenna

Reliable position data in

challenging environments

Customizable Camera

Trigger Intervals

PWM Intervalometer

Ambient Light

Spectrometer

340 - 1010 nm Measurements

← Usable in Direct Sunlight

① DAQ-A-SD for Every Survey3

① log file supports all Survey3 filter models (RGN, OCN, NGB, RE, NIR)

① log file supports any number of Survey3 cameras

Large Viewing Angle

Consistent Off-Angle Measurements

Nano-Bubble Cosine Corrector

Durable Glass Diffuser

Maintains Contrast

In Varying Light Conditions

(Scroll Down for More Samples)

Terrestrial Remote Sensing

Aerial Remote Sensing

Specifications:

Spectroradiometer Calibration Radiometric (Channel to Channel)
Calibrated Image Pixel Units Percent Reflectance
Wavelength Range 340 - 1010 nm
Wavelength Measurement Width 5 nm
Number of Measurements Recorded 134
Wavelength Resolution 20 nm - 50 nm
Wavelength Accuracy 3 nm
Repeatability (peak) 1 nm
Measurement Power Range 20 - 150,000 Lux (PPFD: 0 -2,000 μmol)
Total Measurement Speed ~ 900ms
Signal to Noise Ratio 250 : 1
Dynamic Range > 1000 : 1
Linearity 99%
Integration Time Auto, or Custom (0.25 ms - 100 ms)
Logging Rate 1 Hz
Diffuser Glass Cosine Corrector
Field of View <180 degrees
 
GNSS Receiver (Advanced V2) ublox MAX-M10S, 
Satellites Supported GPS, BEIDOU, GALILEO, QZSS, SBAS
Antenna Ceramic Patch (25 x 25 x 4 mm )
Sensitivity -165 dBm 
Channels 210 PRN 
Logging Rate 4 Hz
GNSS Positional Accuracy 1.5m
Top GNSS Status LEDs Power (green), GPS lock (blue)
IMU Positional Sensor BNO085, 9-axis DoF
 
Memory Storage
Micro SD Card (16GB INCLUDED)
Memory Format Supported
exFAT, FAT32, NTFS
Memory Capacity Supported
Up to 512GB
Logging Duration
16GB = ~135 days, 128GB = ~3 years,  512GB = ~12 years
Camera PWM Trigger Interval
1+, Customizable (in seconds, any duration)
Camera Exposure Pulse Detection
3V3 Relay (High)
Power Input - Max Current
5.0V - 0.26A
Runtime (1x Survey3 Camera Battery)
45 minutes
Runtime (2x Survey3 Camera Battery)
120 minutes
Dimensions
78.6 x 36.0 x 25.7 mm  (L x W x H)
Weight
DAQ-A (57g), DAQ-A-SD (60g)
Bottom Mount Attachment
DAQ-A Slide Rail (3D STEP DOWNLOAD HERE)

 

Our light sensor (spectroradiometer) maintains our reflectance calibration when the ambient light changes.

Below you can see a 3.5 hour time lapse animation with an image captured each minute during partly cloudy weather. The scene is composed of healthy grass with some dead leaves. The images have been processed with a color gradient to show a range from healthy plants (green) to unhealthy/dead plants (red) using the NDVI formula. The 4 sections show the original images, the NDVI when not calibrated, the NDVI when calibrated only with our reference targets and the NDVI when calibrated with both our target and light sensor.

Below: Survey3W OCN, 3.5 hour time-lapse (1 photo/min, 206 frames), Locked Exposure, Cloudy Weather, NDVI LUT 0.2-0.8 [Resolution Reduced for Web Viewing]

Notice how the original images change in brightness constantly as the clouds move in front of the sun. Our light sensor tracks the changes in the ambient light and keeps the index (NDVI) contrast measurements consistent.

Below: Survey3W RGN, 3.5 hour time-lapse (1 photo/min, 206 frames), Locked Exposure, Cloudy Weather, NDVI LUT 0.2-1.0 [Resolution Reduced for Web Viewing]

Survey3W RGN (Left to Right) Original JPG, Calibrated RAW, NDVI LUT 0.2-1.0

Below: Survey3W RGN, Alfalfa Field 400ft, Cloudy vs Sunny Weather, NDVI LUT 0.2-1.0

Using the MAPIR light sensor on an aerial vehicle allows you to capture images even during cloudy weather. The darkening effect from clouds is greatly reduced, allowing consistent data capture in most lighting conditions. The above NDVI images show rows of alfalfa agricultural crops from 400ft (120m), and consist of many individual images that have been stitched together to make a map. Even though there was cloud cover, with the sun going behind the clouds often during the mapping mission, the resulting NDVI contrast map is similar to the next day when the sky was clear.