Foral Terra · Watch a plot · Example

One week of watching, with real data

Example with real, anonymised data: alerts and summaries for a plot in Lagos, captured on 25 September 2026. No name, no address, no coordinates and no customer data.

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Land change detector

The satellite keeps an eye on your plot, even when nobody goes there Beta

We compare satellite images of your plot over time. When the surface changes, we show where and on which dates. We do not say what caused it: the cause stays unconfirmed.

What the detector flags

Vegetation loss · Scrub or trees that stop showing in the images.
New water or flooding · Water where there was none, for example after heavy rain.
Burnt area · Signs of burning. When one exists, we add the official ICNF perimeter.
Earthworks and bare soil · Moved earth or soil left without cover.
New hard surface · A new hard surface, such as concrete or asphalt.
Other surface changes · A visible change that does not fit the types above.

The types are estimated by rules from the images. The cause of the change is not confirmed.

BeforeAfter

Something changes on the surfaceBeta

Satellite image comparison. It shows that something changed on the surface, but not why.

How it works

1The detector needs the plot boundary. If the land registry map covers the point you marked, we use the cadastral parcel automatically. You can also draw or correct the boundary.
2The Sentinel-2 satellites pass every few days. With clouds, the next usable image can take longer.
3We compare each clear image with earlier images of the same plot. We also use the NASA OPERA vegetation disturbance data.
4When there is a change, you see the area on the plot map and the dates of the images. The change stays in the plot history.

Example of a detector alert

Land changeBetaExample

Vegetation loss on part of the plot

What happened: The satellite images show less vegetation in one area of the plot, on two dates in a row.
For your plot: The change is visible. The cause is not confirmed: only someone on site can confirm it.
What you can do: Ask a neighbour or the person who looks after the plot to go and see. Keep the alert: it has the image dates.

Source: Copernicus Sentinel-2In your watch space

The detector is in Beta. We do not publish hit rates yet. A flagged change is a reason to go and look, not proof.

Copernicus Sentinel-2 (ESA / European Union): Contains modified Copernicus Sentinel data.
NASA OPERA DIST-ALERT: OPERA DIST-ALERT product by NASA/JPL, distributed by the NASA LP DAAC.

Real cases and examples

What happened, what Watch a plot showed, what to do

Real cases happened and have a public source. Examples show how Watch a plot handles a situation and are marked “Example”. We show no customer data.

Real caseFire23 Sep 2026

Critical fire day in Lagos

What happened: The IPMA forecast for Lagos gave a critical day: a high of 33 degrees, wind and very high fire risk (4 out of 5).
What Watch a plot showed: An urgent alert for the plots watched in Lagos, with what to do that day. Urgent alerts also go by e-mail.
What the owner can do: No fires and no burning. Put off machine work in scrub until the risk drops. Tell the person who looks after the plot.

Source

IPMA, fire risk and forecast for Lagos

Real casePDM24 Aug to 2 Oct 2026

Public consultation on the Arouca PDM amendment

What happened: Arouca council opened the public consultation on the 1st amendment to the 2nd revision of the PDM (Notice no. 20360/2026/2, Diário da República of 17 August 2026).
What Watch a plot showed: An alert in the watch space with the dates of the participation period and links to the council and to the DGT register. The notice covers the whole municipality: we have not yet checked whether the amendment touches each plot.
What the owner can do: Read the documents on the council page and, if you want, take part by 2 October.

Source

Real caseSubdivision23 Sep 2026

A subdivision change in another parish of Lagos

What happened: Lagos council published Announcement 237/2026: public consultation on the change to the Mata Porcas subdivision, in Luz.
What Watch a plot showed: In September, the announcement went into the weekly summary of plots watched in another parish of the municipality. Under the current rule it no longer goes to those plots: the subdivision is in Luz and they are not. For a plot in Luz, it still shows.
What the owner can do: If the plot is in Luz: open the announcement, look at the plan and take part within the deadline, if you want.

Source

Lagos Municipal Council: Announcement 237/2026

ExampleLand clearingby 30 Jun 2026

Fuel-management deadline in Aveiro

What happened: Aveiro council published Notice 145/2026: work on the fuel-management strips has a deadline of 30 June 2026. The notice is real.
What Watch a plot showed: Example: for a plot in or near a fuel-management strip, Watch a plot shows the deadline in the notice and the link to the document. It does not say the deadline binds you; it says it exists and where it comes from.
What the owner can do: Check with the council whether the plot is in a strip. If it is, clear it or hire someone to clear it before the deadline.

Source

Aveiro Municipal Council: Notice 145/2026

ExampleSatellite detector

Burnt area on part of the plot

What happened: A fire passes near the plot. The next satellite images show signs of burning on part of the plot.
What Watch a plot showed: Example: a land change alert with the area on the map and the image dates. When the official ICNF burnt-area perimeter crosses the plot, the alert says so.
What the owner can do: Ask someone to look at the plot. Keep the alert: it has the image dates and the official source.

Source

Copernicus Sentinel-2 and ICNF burnt-area perimeters

Made for

Watch a plot in each situation

The same service serves different owners. See what we watch in each case and which alerts you can get.

You live outside Portugal

The problem: The plot is far away and you do not know what goes on there. Often you only find a problem months later.

What we watch

Fire risk, weather warnings and heat hotspots near the plot
Council minutes, notices and public consultations
Surface changes on the plot seen by satellite (Beta)

Alerts you can get

Very high fire risk in the area
Yellow warning for strong wind tomorrow
Vegetation loss on part of the plot

What you gain: One summary a week and an e-mail when it is urgent. You know what changed without going there or calling the council.

You inherited a plot

The problem: You do not know the plot well, nor the municipal rules, nor the deadlines that may apply.

What we watch

The PDM and other plans: publication, revision and amendments
RAN, REN and Natura 2000
New laws, deadlines and changes to works licensing

Alerts you can get

Public consultation on the municipal PDM amendment
Legal deadline in 90 days: change to the building works regime (RJUE)
Council notice with the land-clearing deadline

What you gain: You start with just a point on the map, no documents. You understand what changes around the plot before you decide what to do with it.

You have woodland or scrub

The problem: In summer, fire risk and clearing deadlines are a worry. And it is hard to know whether something changed in the middle of the scrub.

What we watch

Fire risk and heat hotspots detected by satellite
Burnt areas, with the official ICNF perimeters
Notices with fuel-management deadlines, when the council publishes them

Alerts you can get

Critical fire day: a high of 33 degrees and very high risk
Heat hotspot detected by satellite near the plot
Burnt area on part of the plot

What you gain: You know when to put off work, when there is a clearing deadline and whether the plot changed after a fire or a storm.

You bought or will buy a plot

The problem: Before buying, you want to know what may change around it. After buying, you want to follow what the council publishes.

What we watch

Subdivisions and public consultations in the area
PDM revisions and amendments
Map changes within 500 metres and local news

Alerts you can get

Public consultation on a subdivision change
Start of the municipal PDM revision
New mineral exploration area requested in the region

What you gain: You decide with more information. The alerts do not replace asking the council, the land registry certificate or advice from a professional.

You manage several plots

The problem: You have family plots in several municipalities, or you look after other people’s plots.

What we watch

Each plot with the sources of its municipality
All plots in the same watch space
The alert history of each plot

Alerts you can get

Strong wind warning in the area of one of the plots
Council notice in one of the municipalities
Surface change on a plot with a boundary

What you gain: You see in one place what changed on each plot and where to start.

A week of alerts, as the owner sees it

Four cards from a plot in Lagos. Open each alert to read what happened, what it means and where it comes from.

A week with partial verification

Recomposed from real data

The weekly summary says first what was checked and what was not. This week the ICNF and DGT layers could not be verified, and the summary says so instead of reading like a calm week.

Week summary

Partially checked156 reviewedfire risk: Muito elevado (4/5)

This week we could not check: DGT (boundaries), ICNF (boundaries).

A deadline

Real alert, anonymised

A legal deadline that is coming up, with its date and source. Watch a plot does not say the deadline binds you; it says it exists and where it comes from.

A withdrawn alert

Recomposed from real data

When an alert was wrong, we withdraw it and say so in writing, above the alert. This one was withdrawn because the match was by parish only.

A quiet week

Recomposed from real data

A week with nothing to report, with every source checked. It is different from a blind week: here the receipt says everything was seen.

Week summary

All sources checked156 reviewed

Questions about Watch a plot

Does the detector tell me what happened on the plot?

No. It shows that the surface changed, in which area and on which dates. The change types are estimated by rules and the cause is not confirmed. The detector is in Beta.

Does the detector work if I only mark a point?

The detector needs the plot boundary. When the land registry map covers the point, we use the cadastral parcel automatically. If it does not, or if the boundary is wrong, you can draw it. The other alerts also work for a point.

Will I get notices about works all over the municipality?

No. A notice that names the plot’s parish, or a place inside it, is always kept. Works at a site in another parish are not sent.

Are the cases on this page real?

Cases marked “Real case” happened and have a public source. Cases marked “Example” show how Watch a plot handles a situation; in the land-clearing example, the council notice is real. We show no customer data.

Want this for your plot?

Register the plot and we follow the same sources for you. Coverage varies by municipality and we always say what we could not verify.

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