Case Study – 44HA Drone Topo Survey for E.R. Garden O.L.S.

Scope of work:
44 Hectares, Orthographic Image 3cm, 3m DTM, 1m Contours

Purpose:
To identify drainage and topography for a new development site in Markham.

Conditions and Requirements:

Overgrown farm lands had been neglected for several years, creating a very rugged, muddy landscape. Normal survey methods by foot or ATV would have been extremely cumbersome and slow going.
Accuracy requirements were +/-10cm on bare earth and +/-30cm in wooded and wetland areas. (excluding bodies of water)

Methodology and Timeline:

2 Aerial surveyors were deployed with an eBee+ RTK and Propeller Aero point.
Crew laid the Aero point as an independent base to ensure proper calibration between E.R. Gardens Data and Canadian UAV Solutions RTK eBee data

7 Aerial Ground Control shots were used in the model..

Processing took a GIS Photogrammetrist 3 days to build, edit and QA/QC the 3D model.

The Completed Drone Survey was delivered in approximately 4 business days.

Summary:

Canadian UAV Solutions was able to provide accurate data in a timely manner where it would have been extremely time consuming using traditional methods.
By adding a few extra aerial points within the workflow of the boundary survey, significant time was saved and resulted in considerable savings for the OLS.
The number of crew required was significantly less, and the amount of time on site was reduced from approximately a week to a single day.
QA/QC reports a RMSE on check points found on bare earth and wooded areas no greater than 3cm on the Z and 1.5cm on the XY, well within specified accuracy requirements.

Testimonial
“I had heard several horror stories regarding drones over the last few years, and up until recently had decided to stay away until the hype had died down.
I had done my research, and although we could have started our own drone program, it became increasingly obvious that it was a lot more complex the further we investigated it.
Many people were doing it, but were either struggling or getting bad results.
After several in-depth conversations with Canadian UAV Solutions, I was assured they knew my requirements and would be able to achieve them.

We developed a workflow which fit well into our operations, and has allowed us to utilize drone data in scenarios where it performs beautifully.

Their Drone survey ties right into our calibration points, and we have done our own QA/QC to confirm the legitimacy of the info.

In areas where we are looking for drainage information, we could not do it faster or for less.

The value added from the aerial photo alone speaks volumes. By adding the image to the topo, we are able to answer questions without sending anyone back to the field.

Bottomline is, we are able to take on more projects as it is increasing the efficiency of my crew. We intend to continue to work together with Canadian UAV Solutions on future projects.”

Edward R. Garden O.L.S.

E.R. Garden Limited, Ontario Land Surveyor

Share

DRONE Survey Application Case Study

Canadian UAV Solutions

Unmanned Aerial Vehicles (UAV) provide a safer and cost effective alternative to many Municipal applications such as:

Urban Planning and Corridor mapping, Road, Rail, and utility inspections, Environmental, and Landfill monitoring, Zoning And Bylaw compliance, Natural Disaster assessment, Flood Plain Mapping, Municipal Drain inspection and planning, Pre-construction planning, Construction project monitoring and tracking, Asset Management data collection and more.

Here’s a Canadian UAV Solutions Case Study:
Bay Sands Subdivision Drainage

Client:
Paul Hauser
R.J. Burnside and Associates Ltd.

Scope of work:
First phase: 80 Hectares, Orthographic Image 5cm, 3m DTM, 1m Contours
Second Phase: Additional 35 Hectares tying into first phase, Orthographic image 5cm, 3m DTM, 1m Contours
Purpose:
To identify drainage and topography for a new subdivision in Wasaga Beach.

Conditions and Requirements:
Large swaths of the survey area were heavily wooded or swampy wetlands, causing issue with accessibility and reliable survey information.
Accuracy requirements were +/-10cm on bare earth and +/-30cm in wooded/wetland areas.
(excluding bodies of water)
Previous survey crews had mapped a wooded area trails the year before,
Our survey was required to tie into past survey crew’s calibration points,
As well as embed their 150 survey shots into the final model.

First Phase Methodology and Timeline:
2 Aerial surveyors were deployed with an eBee+ RTK and R10 GPS.
Crew laid 20 aerial ground control points, distributed throughout the survey area.
Shots were calibrated to previous survey crews’ controls.
15 were used in the model, with 5 as check points.

Approximately 4 hours to lay and mark targets. 
2 flights were performed by a Fixed Wing UAV, data collection took approximately 2 hours.
Final 2 hours for target and equipment clean up.
Field work was completed in about 8 hours, or 1 work day.

Processing took a single GIS Photogrammetrist 4 days to build, edit and QA/QC the 3D model.
The first phase was completed in less than a week, approximately 5 business days.

Second Phase Methodology and Timeline:
After speed, accuracy, and price of first survey, R.J. Burnside was able to commission an additional area to be surveyed.
2 Aerial surveyors were deployed using a Phantom 4 RTK and R10 GPS.
10 aerial ground control points were laid throughout the area.
Calibrated to our own controls from phase 1.
6 were used in the construction, 4 as check points.

Approximately 2 hours to lay and mark targets.
2 flights were performed by a Multi-Rotor, data collection took approximately 1 hour.
Additional hour after data collection to clean up equipment and targets.
The field work was completed in half a working day.

Processing, editing and QA/QC was completed in 2 days by a single GIS photogrammetrist.
The second phase was fully completed in less than business 3 days.

Summary:
We were able to provide accurate data where it was near impossible to obtain with a ground crew.
Was done in a similar amount of time as a standard ground survey, however the number of crew required was significantly less, and thus reflected in considerable savings. (enough to extend the survey area)
QA/QC reports a RMSE on check points found on bare earth and wooded areas no greater than 6cm on the Z and 3cm on the XY, well within specified accuracy requirements.

Testimonial
Paul Hauser – R.J. Burnside & Associates Limited
“A few years ago, Burnside decided to explore the potential applications of a Drone Survey. We contacted Canadian UAV Solutions to do a pre-construction scan of a project which was about to get underway. Within about a week we had our topography and site imagery from the day of the survey. The topographic information was very dense, which provided our engineers ample data to produce an accurate drainage plan. A normal ground crew would have struggled getting GPS lock in this dense forest, and cannot provide the imagery data which has been useful to identify feature locations.
Since then we have used Canadian UAV Solutions for various municipal construction projects and plan to explore drone applications further.”

Should your Municipality be open to exploring a more efficient mode of data collection, contact Canadian UAV Solutions today, and we will be happy to answer your questions or provide quotations.

 

Share