The AeroPoints have been designed so that you can use them in five different ways. For each method there are different logging and placement requirements that should be adhered to and these are outlined below. For all methods, we strongly recommend collecting the AeroPoints in reverse order to get the best possible result—this video explains how.

Below is a summary of each method so you can select which method suits you the best. However, we encourage you to use the first method within Propeller’s Correction Network coverage area wherever possible.  

1. Fully Automated Processing in Correction Network Coverage Areas:

Automated processing is the simplest way to use the AeroPoints, ensuring a short turnaround time of less than 48 hours and all the efficiency benefits AeroPoints provide.

If you’re flying within the Propeller Correction Network, then take advantage of our fully automated processing. Let us know if you’re not on the map — we’re expanding our coverage network every week. 

For this method:

Global accuracy: the best available, 20mm/20mm/50mm

Consistency: the best available, 20mm/20mm/50mm

Internal accuracy: 10mm or less — precise internal reconstruction

2. Using an AeroPoint as a Base Station on a Known Mark:

This is the best approach for worksites using their own site calibration.

You can place one of the AeroPoints at a known survey mark or benchmark location (be sure to place this AeroPoint first, and pick it up last—it must be recording data for the duration of your flight). We can then use this AeroPoint, combined with the known coordinates of that mark, as the reference point for the other AeroPoints used in the survey.

Placing an AeroPoint over a known survey mark.

For this method:

Global accuracy: If you place the AeroPoint accurately, the best available, 20mm/20mm/50mm (plus the accuracy of the mark itself)

Consistency: If you use the same known mark each time, the best available, 20mm/20mm/50mm

Internal accuracy: 10mm or less — precise internal reconstruction

How to select this method

In the AeroPoints portal, when you select "Process" you will have the option to select the Known AeroPoint Location method. To use this method, you will need to enter information shown in the text fields below.

For Coordinate Type, you will need to know whether your surveyed AeroPoint location is in geographic coordinates (latitude/longitude), a projected map grid (easting/northing), or a local grid (only if your Site has a local grid already defined).

Once you have selected one of these options, search for the Coordinate Reference System that your AeroPoint was surveyed in at the next text field.

The AeroPoint Capture is the ID number of the surveyed AeroPoint, printed on the bottom right of the AeroPoint.

Measured To indicates whether your point was surveyed to the top of the AeroPoint, or the ground below the AeroPoint.

Units must be in meters, US international feet, or US survey feet.

The northing (or latitude), easting (or longitude) and ellipsoid height (not geoid height) of the surveyed AeroPoint should be entered in the text fields below. If you are using geographic coordinates (latitude/longitude) the ellipsoid height must be entered in meters).

Working with local site calibrations 

If you work on a site with its own local calibration, we can correct your AeroPoints to positions in your local site coordinates. 

You can upload a Trimble site calibration file (.CAL), or send us or a point pair file (i.e. a list of points in both global and local coordinates). You can generate a point pair file by capturing points around your site with a rover and using software such as Trimble Business Center to output the file. If you’re interested in using this method, please talk to us first: support@propelleraero.com 

3. Using an AeroPoint to create a new known mark

If there are no known marks available, the global accuracy of your data will be reduced. However, you can still use AeroPoints to get results that are internally accurate and consistent over time. 

Find a hard, flat surface that will not move or be disturbed, and establish your own "mark" (we recommend using heavy-duty aerosol paint like that used for line-marking). Place one AeroPoint at this mark and ensure it is left in place to record at least two hours of data. 

For your first flight, we’ll use the data from this AeroPoint to calculate an estimated point (accurate within 50cm). For subsequent flights, we’ll treat that coordinate as a "known mark." 

Global accuracy: 500mm/500mm/500mm
Consistency: 20mm/20mm/50mm (the best available—dependant on using same known mark each time)

Internal accuracy: 10mm or less (precise internal reconstruction)

4. Using Your Own RINEX Corrections:

You might have access to a dual frequency L1/L2 RTK rover, or the site may have an RTK base station receiver. Provide us with RINEX formatted GNSS observations for the period of your survey and we can use that as the reference point.

Please note that the RINEX file must have an accurate location for the base in the header as this is the location that the AeroPoints will be measured against.

We need RINEX version 2.11 with a minimum frequency of one observation every 10 seconds. It must cover the whole period of the survey and have no gaps longer than 10 minutes. It must also have an accurate position header.

For this method:

Global accuracy: the best available,20mm/20mm/50mm

Consistency: the best available, 20mm/20mm/50mm

Internal accuracy: 10mm or less — precise internal reconstruction

5. "Just Lay Them Out"—PPP processing

If none of the abovementioned is an option, unfortunately there will be reduced accuracy globally, and there will be less alignment between sequential surveys. However, you’ll still get extremely accurate internal reconstruction with AeroPoints — measurements and distances will be precise.

This can be very useful — for example if you are only capturing a site once, like a damage assessment or traffic accident capture — and don’t need precise measurement of changes over time.

For this method:

Global accuracy: 500mm/500mm/500mm

Consistency: 500mm/500mm/500mm

Internal accuracy: 10mm or less — precise internal reconstruction.

Summary

This table compares the accuracy and time requirements of the different methods of use:

Configure your smartphone hotspot to act as Propeller WiFi network.

Using an Android device

Change the name of your WiFi hotspot to "propeller" and set the password to "propeller."  The procedure for setting up a WiFi hotspot is different for each Android device. Refer to instructions from your specific device manufacturer (or Google it). 

Using an iOS device

  1. Change your device name: From Settings, navigate to General >  About > Name. Change the name of your device to "propeller" (Diagram 6.1).
  2. Change your Personal Hotspot password: From Settings, navigate to Personal Hotspot. Change WiFi password to "propeller" and toggle Personal Hotspot to "on" (green) (Diagram 6.2).

Important: Keep your iOS device open on the Personal Hotspot screen to maintain connection and monitor data upload.

Support

Need help? Visit learn.propelleraero.com for how-to articles, tutorial videos and more.

Email support@propelleraero.com to get in touch with our team. 

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