Confidence
Raise it to keep only the shapes the model is sure of. Lower it to bring the doubtful ones back.
AI Segmentation QGISEvery object in your imagery becomes a polygon.
Click one object and it is traced.
Draw an area and every match inside comes back, ready to export.
4.5
343+ votes64,000+ downloads0:00 / 0:00
Before you install
AI Segmentation, the QGIS plugin by TerraLab, turns aerial or satellite imagery into vector polygons.
Name what you want and it finds every one: buildings, trees, solar panels, roads, pools, field parcels, anything you can describe. It reads any raster QGIS already displays, from a drone orthomosaic to a WMS, and returns a vector layer in your project CRS with an id, a class, an area and a confidence on every polygon.
- Runs in
- QGIS 3.22 and later
- Runs on
- Windows, macOS, Linux
- Starts at
- Free, no card
Two modes
The plugin has two modes
One covers the area you draw. The other traces the object you click.
Automatic
A whole area at once
Draw a rectangle, name the object, and every match inside comes back in two or three seconds. Use it when the objects repeat: roofs, panels, parcels, tree crowns.
What it buys you
One drawing covers a whole district.
Runs on our servers in Europe. Counted in km² of ground.
Pick this when you would otherwise trace the same shape over and over.
Semi-Auto
One object under your cursor
Click the thing you want, it is traced in under a second, you save it and move on. Use it on the awkward ones: a wall, an odd yard, a patch with no clean edge.
What it buys you
You choose every object that lands in the layer.
Our servers in Europe, or your own machine offline. Counted per object saved.
Pick this when the objects are few, or too irregular for one description to cover.
Automatic mode
What an Automatic run needs from you
What you are looking for
Plain words: building, tree, road, solar panel. Any object you can name.
An example, when words are not enough
Draw one of the objects on the image and the model follows it. Every extra example sharpens the run.
How fine to cut it
Precision splits the area into tiles. Small tiles catch small objects. Big tiles give the model the wider view that farm parcels need.
2 to 3 secondsServers in EuropeNever resold, never reused
Semi-Auto mode
How Semi-Auto works
One object at a time, on purpose. Selecting two at once gives a worse shape, so the panel saves them one by one and the layer stays clean.
My computer
A small open source model, installed once. It runs offline on your own machine, with no counter, slower and less sharp.
One download, then nothing leaves your computer
Cloud AI
Nothing to install, the stronger model, under a second a click. Our servers are in Europe.
Nothing to install. Clicking is free, one object from your monthly allowance per save
Why automate
A GIS planner traced 600 roofs in under 10 minutes. By hand it had taken him 3 to 4 hours.
Reported on a 2 GB drone orthomosaic.
Real runs
What you can detect
Each tile is a real automatic run in QGIS. Every polygon carries its area and a confidence score, so you can filter before you export.
After
BeforeBuilding footprints
Every roof on the block, from your own imagery.
After
BeforeSolar panels
A whole solar farm, block by block.
After
BeforeTrees
925 crowns over parkland, each its own polygon.
After
BeforeRoads & paved surfaces
Road extraction across a dense city district.
After
BeforeSwimming pools
Every backyard pool in a residential block.
After
BeforeField parcels
Farm parcels for land cover mapping.
Both modes
The controls that take the layer to 100 percent
The AI gets the bulk of it right. These eight controls, in Automatic and in Semi-Auto, close the last ten percent it can miss, so the layer you hand over holds up to professional scrutiny. None of them touches your counters.
Size filter
Set a smallest and a largest area. Everything outside the range drops out.
Right angles
Walls come back straight instead of wobbly. On by default for buildings.
Round corners
The opposite setting, for tree crowns and anything with no straight edge.
Fewer points
Simplify the outline down to the points you need, so the layer stays light to edit.
Grow or trim
Push every polygon out for a buffer, or pull it in when the outline runs wide.
Split and redraw
Cut one polygon in two, or redraw a single edge while the rest stays put.
View modes
Colour the batch by confidence, or drop to outlines, to check the fit against the image.
What you walk away with
A vector layer you can hand over
Export drops a normal vector layer into your panel, with an id, the class you asked for, the area, the perimeter and the confidence on every polygon, in your project CRS.
- GeoPackage
- GeoJSON
- Shapefile
- KML
What you export stays yours, on every plan, including the free one.
Attribute table
| id | class | area_m2 | perim_m | confidence |
|---|---|---|---|---|
| 1 | building | 184.2 | 58.6 | 0.97 |
| 2 | building | 96.5 | 41.0 | 0.94 |
| 3 | building | 212.8 | 63.4 | 0.91 |
| 4 | building | 77.1 | 35.2 | 0.88 |
Plans and pricing
Free is there to try it. Pro is there to finish the job.
To try it out
Free
€0per month
no card
- 1.5 km² in Automatic mode
- 20 object detections in Semi-Auto mode
- Selection capped at 1.5 km² per search
- Not included:Commercial use
For you, on your own
Pro
€39€33/month
€390 billed yearly · Save €78
- 200 km² in Automatic mode
- 500 object detections in Semi-Auto mode
- No cap on the zone you draw
- Commercial use
For your organization
Organization
On quote
Invoice, purchase order, bank transfer
- More than 200 km² a month
- Zero data retention
- Shared access across several people
- Commercial use for the whole team
Prices excl. VAT. Tax is calculated at checkout.
Pack
Best valueEvery QGIS plugin, one subscription.
AI Segmentation Pro, 200 km² and 500 objects a month
AI Edit Pro, 3,000 credits a month
AI Agent Pro, 300 runs a month
Line by line, Free against Pro.
Automatic counts the ground your area covers, in km² on the map. Semi-Auto in the cloud counts one object detection per save. Clicks and corrections are free, and Semi-Auto on your own computer has no counter.
| What you get | Free | Pro |
|---|---|---|
| Automatic detection a month | 1.5 km² | 200 km² |
| Biggest area you can draw in one run | 1.5 km² | No limit |
| Objects saved in Semi-Auto a month | 20 | 500 |
| Drawn examples per run | 1 | Up to 5 |
| Semi-Auto on your own machine | No counter | No counter |
| Runs kept with their imagery, to reopen later | Not included | Included |
| Commercial use | Not included | Included |
What users are saying
Frequently Asked Questions
- AI Segmentation is a QGIS plugin that turns imagery into vector polygons. Point at one object and get its outline, or draw an area and let the AI find every instance inside it.
- Yes. Semi-Auto on your own machine is free forever and open source, with no counter. The cloud comes with two monthly allowances, no card asked: Automatic covers 1.5 km² of ground, and Semi-Auto covers 20 object detections, one per object you keep. Pro raises them to 200 km² and 500 objects, and keeps the fine grid on wide areas.
- Pro lifts what stops a free account on real work. The free plan is for personal, non-commercial use; Pro adds commercial use. Free Automatic covers 1.5 km² of ground a month; Pro covers 200 km². A km² is a km² on the map, whatever the imagery and whatever Precision you pick. A wide area on Free is spread over a coarser grid, so width costs detail; Pro keeps the fine grid at any width. Pro also raises Semi-Auto to 500 object detections a month, and keeps every run with its imagery, so you can reopen and re-export it months later. €39 a month, cancel anytime.
- Anything visible in your images: buildings, roads, vegetation, vehicles, water bodies, agricultural parcels, and more. It works on satellite imagery, aerial photos, drone images, and any other image layer in QGIS.
- We publish no accuracy figure, because one number would be false: it moves with your imagery, your resolution and what you are extracting. We show you the errors instead. Every automatic run opens in a review step where you filter by confidence and size, add what was missed, delete what is wrong, and square off building corners. On a dense Paris block, 635 raw polygons came down to 82 real buildings. Corrections never cost anything. Test it on your own imagery for free, that is the only honest measure.
- Yes. Pro puts no limit on the area you draw. Automatic splits a large area into tiles, detects each one, and stitches everything back into a single polygon layer, merging objects that cross tile edges. Pro covers 200 km² of ground a month, counted on the map: the Precision you pick changes what the AI finds, never what the run costs. On the free plan Automatic covers 1.5 km² a month, and a wider area is spread over a coarser grid unless you raise the Precision, so width costs detail.
- Your imagery is processed and stored on our servers in Europe, and nowhere else. We do not train any model on it and we do not share it. If you prefer, Semi-Auto runs on your own machine, and then nothing leaves your computer. On Free we keep a technical copy of each click square for 12 months to measure detection quality, and you can opt out in Settings. On Pro no copy is ever written. The outlines you save stay in your history until you delete them, or for the 30 days, 90 days or 1 year you choose on Pro, and you can export or delete everything from your dashboard.
- Ask us and we send the one-pager they need: what leaves QGIS, where it is processed, how long we keep it and how to have it deleted. In short, Semi-Auto on your own machine uploads nothing. Cloud AI sends a small square of imagery around each click, Automatic sends the tiles inside the area you draw, both to servers in the European Union, and the plugin asks before the first one. We are a French company and everything we receive stays in the EU.
- Open QGIS, go to Plugins → Manage and Install Plugins, search for "AI Segmentation" and click Install. Or download directly from the QGIS Plugin Repository.
- Yes. You can cancel anytime from your dashboard and keep Pro until the end of the period you already paid, with no lock-in. Because Pro gives immediate access to the service, subscription fees are generally non-refundable, but if something went wrong just email us and we'll make it right.
- You do. Every polygon you extract is yours to keep and redistribute. Your imagery stays yours, and we never resell or reuse your imagery or your results. Using them in paid work needs a paid plan: the free plan does not carry commercial use.
Draw your first area today
Install the plugin, sign in, and get polygons out of your own image in under five minutes.
No card. 1.5 km² of automatic detection and 20 objects every month.