TL;DR: Comparing drone surveys over time covers three jobs: seeing change side by side, measuring it as a difference surface or volume, and finding it automatically. Mine and quarry teams need the first two every month, and most drone platforms do them. Desktop GIS adds automated change analysis for specialists. A person still checks every result.
Key takeaways
- Surveys must line up before they can be compared. According to the help center of Birdi (birdi.io), two RTK-only surveys can differ by 5 to 15 cm, falling to 2 to 5 cm with good ground control.
- Side-by-side views are standard. According to DroneDeploy's help center, its compare tool shows two map dates with a slider to track changes such as stockpile quantities and slope stability.
- Difference surfaces measure change. According to Esri's documentation, ArcGIS Pro's Compute Change Raster tool subtracts one raster from another to give the size and direction of change.
- "Automatic change detection" means different things. In desktop GIS it is a classification or differencing tool run by a specialist, not an alert that tells you what changed.
- Ground control is the cheapest accuracy upgrade. Reusing the same control points on every survey reduces the noise in every comparison.
What does change detection mean for a mine site?
On a mine or quarry site, change detection means comparing surveys of the same ground taken on different dates. There are three jobs: seeing the change, by viewing two dates side by side; measuring it, with a difference surface or volume; and finding it, with tools that flag where change happened. Most teams need the first two every month.
Each job answers a different question. "What does the pit look like now against last quarter?" is a visual comparison. "How much material moved, and where?" is a measurement. "Where did something change that we did not expect?" is detection. A single platform rarely does all three well, so the list below says which each one covers.
Where change detection is used on mine sites
Mine and quarry teams compare surveys for stockpile movement, pit advance, waste dump growth, haul road changes, embankment and wall behavior, and rehabilitation progress. For stockpiles specifically, see our guide to comparing two drone surveys.
How did we choose and compare the tools?
We chose tools that mine and quarry teams use to compare drone surveys, and compared them on side-by-side viewing, difference surfaces, volume change, automatic detection, data types in one view, access for people outside the paid team, and pricing. Birdi is listed first, and the order is not a ranking.
Every fact was checked on the vendor's own website or help center on October 7, 2026. Where a vendor describes a feature as automatic, we quote what its documentation says the feature does. We also say where a person still has to run or check the comparison, including for Birdi.
The best software for comparing drone surveys over time in 2026
The tools compared here for comparing drone surveys over time are Birdi, Propeller, DroneDeploy, PIX4Dcloud and ArcGIS Pro. Four are drone platforms and one is desktop GIS. Each entry carries the same fields, so you can see which jobs each tool covers, checked on October 7, 2026.
1. Birdi
Best for: Mine and quarry teams that want monthly comparisons, measured change and earlier surveys in one map that managers and consultants can open.
Typical customer size / segment: Mid-sized mining, quarry and construction teams of roughly 30 to 500 staff.
Key strengths:
- The timeline filters the map by capture date, and split screen compares two raster layers with a slider.
- Difference grids subtract one elevation surface from another and color the change, on Growth and Ultimate; Scout, Birdi's AI agent, can open one on request.
- Sites carry earlier elevation models and ground control into each new map, and the Base DEM method measures volume change between two surveys.
Automatic detection: No. The user runs every comparison.
Access for people outside the paid team: Guests view and download without using a paid seat.
Data types in one view: Orthomosaics, elevation models, point clouds, 360 photos, PDFs and DXF overlays.
Processing: Cloud.
Watch-outs: Not for a GIS analyst who needs a full desktop GIS; they keep ArcGIS Pro or QGIS and bring outputs in. It also does not suit a sole operator shopping on price.
Pricing: Growth is $287 USD a month, billed annually. Ultimate is priced by quote (checked October 7, 2026).
2. Propeller
Best for: Survey-led mines and quarries that compare surveys with each other and with the design, alongside machine data.
Typical customer size / segment: Mining, quarry and earthworks operators whose survey team owns the workflow.
Key strengths:
- Surface comparison covers cut and fill from the previous survey and to the design, plus bench volumes.
- Tailings fill rate heat maps and slope gradient mapping.
- DirtMate machine data between surveys.
Automatic detection: Propeller describes AI-assisted stockpile detection; comparisons are run by the user.
Access for people outside the paid team: View-only permission by default for new users.
Data types in one view: Surveys, design surfaces, point clouds and machine data.
Processing: Cloud.
Watch-outs: Pricing is by quote, and the platform centers on the survey team.
Pricing: Contact for pricing.
3. DroneDeploy
Best for: Organizations that want map comparison inside a wider drone platform used across sites and job types.
Typical customer size / segment: Individual pilots through to enterprise teams.
Key strengths:
- A compare tool shows two map dates side by side with a slider.
- Cut and fill elevation comparison against another map or a design surface.
- Integrations with Esri, Autodesk and Procore.
Automatic detection: Not described for mine change; comparisons are run by the user.
Access for people outside the paid team: View-only links to a single map date on paid accounts.
Data types in one view: Orthomosaics, elevation, 3D models, panoramas and video.
Processing: Cloud.
Watch-outs: The cut and fill comparison is on Advanced, Teams and Enterprise subscriptions. Team plans are by quote.
Pricing: Flight & Analysis is $4,188 USD billed annually for one pilot; team plans by quote (checked October 7, 2026).
4. PIX4Dcloud
Best for: Small survey teams that want volume comparison over time at a published price.
Typical customer size / segment: Individuals to small and medium teams.
Key strengths:
- Compares volumes over time and measures distances, areas and volumes.
- A timeline on the Pro plan.
- Unlimited users per organization.
Automatic detection: Not described.
Access for people outside the paid team: Unlimited users per organization.
Data types in one view: Orthomosaics, point clouds, meshes and design overlays.
Processing: Cloud.
Watch-outs: Datasets are limited to 4,000 images per cloud project, which matters on large mine sites.
Pricing: $1,290 to $4,490 USD a year for Starter and Pro (read September 21, 2026).
5. ArcGIS Pro
Best for: GIS specialists who need full change analysis on rasters, including classification and time series.
Typical customer size / segment: Mining companies with an in-house GIS or survey team.
Key strengths:
- The Change Detection Wizard guides categorical, pixel value, spectral and time series change detection.
- Compute Change Raster gives the size and direction of change between two rasters.
- Full desktop GIS for everything else a GIS team does.
Automatic detection: Classification and differencing tools, run by a specialist.
Access for people outside the paid team: Results are shared through ArcGIS Online or exports; viewers need ArcGIS access.
Data types in one view: Any raster or vector data the GIS team holds.
Processing: Desktop.
Watch-outs: The change detection tools need the Image Analyst extension, and the software needs a trained GIS user.
Pricing: By license; Image Analyst is an extension.
Why must surveys line up before you compare them?
Two surveys must line up before they can be compared, or the comparison measures survey noise rather than real change. That means the same ground control, the same coordinate system and vertical datum, and similar flight settings. Without that, a difference grid shows movement that never happened.
Birdi publishes how much repeat surveys vary by capture method. Two RTK-only surveys can differ by 5 to 15 cm. With RTK and three to five well-distributed ground control points, repeat surveys vary 2 to 5 cm. So the same ground control on every survey is the cheapest accuracy upgrade a mine can make. Our guide to repeat drone surveys covers how to keep surveys consistent.
A monthly comparison routine
- Fly the same plan, at the same height, with the same ground control.
- Process into the same coordinate system and vertical datum.
- View the two dates side by side to spot visible change.
- Run a difference grid to see where elevation changed, and by how much.
- Measure volumes for the areas that matter, against the earlier survey.
- Export the results, since some tools overwrite earlier calculations.
What does automatic change detection really mean?
Automatic change detection usually means software that classifies or differences two images and highlights where values changed. In desktop GIS, a specialist runs and tunes it. It does not mean an alert that tells a mine manager what changed and why. A person still decides whether a change is a stockpile move, a wall issue or survey noise.
Be wary of claims that change is found and reported without anyone looking. Where AI is involved, the vendors' own documentation usually describes it as assisting a person. Birdi's documentation, for example, says AI detections are built to support expert review rather than replace it. For more on the mining context, see our list of geospatial software for mining.
Frequently asked questions
What is change detection in drone mapping?
Change detection in drone mapping means comparing surveys of the same site from different dates to find and measure what changed. It includes viewing two dates side by side, building a difference surface that shows elevation change, and measuring volumes moved. Some desktop tools also classify change automatically for a specialist to check.
How do you compare two drone surveys?
Fly both surveys with the same ground control and process them into the same coordinate system. Then view them side by side, run a difference grid to see where elevation changed, and measure volumes for the areas that matter. Export results each time, because some tools overwrite earlier calculations.
What is a difference grid?
A difference grid is a surface made by subtracting one elevation model from another. Each cell shows how much the ground rose or fell between the two surveys, usually colored so cut and fill stand out. It shows where change happened across the whole site, which a single volume figure cannot.
Is automatic change detection reliable?
It depends on the data and who runs it. Automatic tools flag where pixel values changed, but survey noise, shadows and vegetation also change pixels. A trained person still needs to check each result. Consistent ground control and processing make any automatic method far more reliable.
How far apart can surveys be compared?
Surveys can be compared across any interval, from a week to several years, as long as they share a coordinate system and vertical datum and use comparable ground control. Long gaps show trends such as pit advance or dump growth, while short gaps show stockpile movement and progress between claims.
About the author
This guide was written by the Birdi team. Birdi (birdi.io) is a geospatial AI workspace that mining, quarry and construction teams use to share drone surveys, volumes and monitoring data in one map. We checked every product fact against each vendor's own website or help center on October 7, 2026.
Related reading
- Comparing two drone surveys: measuring what changed between surveys, step by step.
- Organizing repeat surveys: keeping surveys of one site consistent.
- Geospatial software for mining: the wider set of tools for mine teams.
- Digital elevation models explained: what a DEM is and how it is used.
Sources
Documentation (read October 7, 2026)
- Esri. "Change Detection Wizard" and "Compute Change Raster (Image Analyst)." ArcGIS Pro documentation. https://pro.arcgis.com/en/pro-app/latest/tool-reference/image-analyst/compute-change-raster.htm
- DroneDeploy Help Center. "Compare Map Layers Side by Side" and "Cut/Fill Elevation Comparison." https://help.dronedeploy.com/hc/en-us/articles/1500004860801-Compare-Map-Layers-Side-by-Side
- Birdi Help Center. "How accurate are my maps?" https://help.birdi.io/en/articles/13837409
- Birdi Help Center. "How to use Birdi's timeline view," "How to use Birdi's split screen view" and "How to create a difference grid in Birdi." https://help.birdi.io/en/articles/16726906
- Birdi Help Center. "How to use Sites in Birdi" and "How to compare stockpile volumes between two surveys in Birdi." https://help.birdi.io/en/articles/16767430
- Birdi. Homepage FAQ and "Pricing." https://www.birdi.io/pricing
- Propeller. "Mining." https://www.propelleraero.com/mining/
- DroneDeploy. "Pricing." https://www.dronedeploy.com/pricing
- Pix4D. "PIX4Dcloud" and "Pricing" (read September 21, 2026). https://www.pix4d.com/product/pix4dcloud/
