Field Notes

Bouldin Corn: 2021-06-22 11:45:00 (DOY 173)
Author: Daphne Szutu
Others: Dennis, Ariane

Summary: Regular data collection/cleaning, windy, spectral, veg height, downloaded IRT data, fiddled with picam clocks

2021-06-22
Bouldin Corn

Dennis, Ariane, and I arrived at 11:45 PDT. It was a breezy and warm day with good visibility. The corn is about chin height.

Dennis took spectral and veg height measurements.

Ari cleaned flux and rad sensors. I downloaded met, camera, and USB GHG data. I downloaded the FD data and cleared its memory. I downloaded the PA data and power-cycled the sensor.

The dfPAR still has NANs, and I wonder if itâ€™s because itâ€™s sharing a control port with the 6 NDVI/PRI sensors (via a screw terminal). They all have different addresses, so it shouldnâ€™t matter. But to see if it would make a difference, I moved the dfPAR from C7 to C5. C5 is also used by the water level sensor. I uploaded a new datalogger program with the new control port.

I downloaded the undercanopy cameras and cleared their memories. For Picam 1, I changed the clocks from 11:22 to 11:15 to match the laptop time. For Picam 2, I changed the clocks from 11:21 to 11:10 to match the laptop time.

Their clocks were off again by about 7-10 minutes even though we just re-set them last week. Joe suggested I check both the system time and the real-time clock (RTC) times. When I arrived, the system time and RTC were the same. After I set the system time using the â€œsudo date â€“sâ€ command, the system time was correct but the RTC time was still bad, so I figured the RTC was setting the system time every once in a while (maybe on start-up?). I used the â€œsudo hwclock â€“wâ€ command to set the RTC using the system time and confirmed the RTC and the system time matched. I restarted the picam and confirmed the RTC and system times still matched. I went through the same process for both cameras.

Summary of clock commands for the pi:
To check system time: date
To check RTC: sudo hwclock â€“r
Set system time: sudo date â€“s â€œTue 22 Jun 14:15:00 -08 2021â€ (make sure text string matches format of the output from the â€œdateâ€ command)
Set RTC time from system time: sudo hwclock -w

I also downloaded the IRT files by moving them from the microSD card to the laptop. Next time Iâ€™ll use the LoggerNet utility CardConvert to convert them from binary to TOA5 format. I inserted the microSD card back into the IRT datalogger but I canâ€™t remember if I waited for the Activity LED to blink.

LI-7500 readings:
CO2 392ppm
H2O 730ppm
T 24.5C
P 101.1kPa
SS 100-->102 after cleaning
LI7700 readings:
CH4 1.92
RSSI 60-->74 after cleaning

We left at 12:30 PDT.

Veg Height (cm): Tape measure from ground to top of plant
122, 141, 150, 150, 120, 130, 128, 135, 162, 152, 157, 183, 157, 163, 171, 145, 169, 133, 163, 148, avg = 149, stdev = 17.24

0 photos found

6 sets found

17 BC_met graphs found