Apr 09, 2020
Trimble GPS Protocol
- 1Université de Sherbrooke
- Canadian Airborne Biodiversity ObservatoryTech. support email: jocelyne.ayotte@umontreal.ca
External link: http://caboscience.org/
Protocol Citation: Sabine St-Jean 2020. Trimble GPS Protocol. protocols.io https://dx.doi.org/10.17504/protocols.io.9zeh73e
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: In development
We are still developing and optimizing this protocol
Created: December 02, 2019
Last Modified: April 09, 2020
Protocol Integer ID: 30470
Abstract
Here we describe the standardised protocol used by the Canadian Airborne Biodiversity Observatory (CABO) to use the Trimble GPS with the NTRIP centimeter-level precision subscription from Cansel to record the precise location of a plot (corner or center) or a plant.
Materials
Equipment
new equipment
NAME
Trimble Catalyst GPS, NTRIP precision subscription
BRAND
-
SKU
Equipment
new equipment
NAME
CAT S41 Field cellphone
BRAND
-
SKU
LINK
Before start
Ensure you are subscribed to a centimeter-level correction service (e.g.: Cansel).
GPS Connection
GPS Connection
Connect the Trimble antenna to your field cellphone, by plugging the cable coming out of the antenna into your cellphone charging port.
Connect the external battery to the Trimble antenna, by plugging the USB port into the battery and the micro USB port into the antenna. Place the battery in its mount.
Open the Trimble Mobile Manager app on your fieldwork cellphone.
Sign in.
The following screen will show up.
Slide the Connect to Trimble Catalyst button.
If the following screen shows up (it does not systematically), tick the Use by default for this USB accessory box.
The app searching for GPS signal will show this screen.
Wait for the precision to go down.
Point Recording
Point Recording
Open the Fulcrum app on your fieldwork cellphone.
In Fulcrum, go to the plot or tree record you want to georeference precisely, then go under Location.
Watch the value of Horizontal Accuracy and wait for it to stabilize.
Note
DEFINITION OF A GOOD PRECISION:
In forest environments, under a canopy with no leaves (i.e., after leaf fall), the precision can be under 30 cm.
In the best conditions in an open environment, the precision can get down to 2 cm.
Once the Horizontal Accuracy is stable at a good precision, click Update Location with GPS. You’ll see the values next to Latitude, Longitude, Horizontal Accuracy and Altitude update.
Save your record.