Monitor site changes across a property portfolio
Build a portfolio monitoring process around dated imagery, useful change observations and clear responsibilities for follow-up.
A portfolio review should help your team decide which sites need attention and what to do next. Satellite imagery adds a dated view of external conditions, giving you another source of evidence between visits and local reports.
The useful output is a review record: what appears to have changed, which images support that observation, what remains uncertain and who will investigate. That record connects a change on the map to the work required on the ground.
Choose the changes that matter
Start with a business question for each type of site. A construction manager may want to review apparent changes in the building footprint. An operations team may want to investigate new activity near an access route. The monitoring brief should identify the observable feature and the decision it could inform.
Keep the brief specific enough to guide a reviewer. “Watch this property” leaves too much interpretation. “Review new external activity around the access route” gives the team a defined area and a reason to look.
Establish a usable baseline
Record the site boundary, image source, capture date and visibility of the relevant area. Check that the boundary refers to the intended asset rather than a neighbouring parcel. Note any part of the site that is obscured or too small to assess.
A baseline is a reference for comparison, not a declaration that everything was in good condition. Pair it with the site information your team already holds, including known works and open maintenance questions.
Separate the image schedule from the review schedule
Satellite capture, image availability, analysis and human review happen at different times. A scheduled check may run without a usable new observation. The correct outcome then is “no new usable image”, rather than “nothing changed”.
Check the site itself for cloud and shadow. Planet's image-analysis documentation explains that filtering cloud at scene level can still leave unsuitable frames. A filter alone does not establish visibility at your property.
Review an apparent change in context
Compare capture dates and viewing conditions before interpreting a difference. Seasonal vegetation, shadows and temporary activity can make two images look different without indicating a lasting site change.
For an illustrative example, imagine a newly visible cleared area beside a portfolio property. The reviewer should first establish whether it lies inside the monitored boundary. Next, check whether it corresponds to planned work. If the explanation remains unclear, record the observation and request current local information. The image starts the enquiry; it does not establish unauthorised work.
Give each observation a next step
Use a compact review record:
- The site and area affected.
- The before-and-after capture dates.
- The visible difference and any uncertainty.
- The person responsible for checking it.
- The next action and the evidence needed to close it.
Keep a task being assigned separate from the investigation being completed. A site with no visible change can still require a planned inspection or maintenance visit.
Make the process useful across the portfolio
At GeoSpectre, AI detection in satellite imagery helps identify physical features and changes, while supporting information helps users assess the findings. The business value comes from connecting that evidence to a decision about where to act.
Start with a manageable group of sites and review whether the observations answer the questions you set. Refine the brief as you learn which changes are useful and which need other sources.
Explore the workflow, or book a demo around your sites and review requirements.
Related guides
- Review construction progress with satellite imagery
- Turn satellite observations into useful business evidence
Key takeaways
- Define the change and decision before setting up monitoring.
- Keep capture dates separate from analysis and review dates.
- No usable new image does not mean no change.
- Assign a next action without treating imagery as a substitute for required inspections.