Vegetation Alerts

We’re happy to provide the Lens Alerts feature for customers in the Plus and Enterprise plans. 


Lens Vegetation Alerts are designed to support Lens customers monitoring large properties or portfolios, ensuring that they can quickly review and respond to changes. For enrolled properties, vegetation alerts identify areas where a significant decrease in vegetation vigor has occurred compared to the same period in prior years. 

Activate vegetation drop alerts

From the Property Map page, you will see a new option on the left side pane called “Alerts.” From the Alerts pane, you’ll see the option to toggle vegetation alerts to active for this property. 

This means that starting immediately, your property is automatically being monitored for unseasonal drops in vegetation vigor for at least three sensings using Sentinel-2 data as it becomes available approximately every five days. 

Specifically, our machine learning model is looking for areas where vegetation data diverges significantly (NDVI decrease of .38 or more) from the prior year, as shown in the example below of a solar farm installation. The spatial threshold is > 500 square meters, or about 50 pixels in Sentinel-2 scenes. This means that changes such as small thinnings or dumping will not be detected, but larger changes such as a timber clearing or fire will prompt an alert. 

Review alerts and save as notes

If a change occurs on an enrolled property, a system-generated note is created that indicates the date or dates over which changes were detected, as well as a red polygon indicating the area that changed. You can click on the dates to go into compare mode for these two time periods and scroll to visually compare the changes in vegetation vigor. 

From here, you can “Save as note” or “Dismiss alert”. “Save as note” means that the alert text and layers will be moved into your Notes pane. The individual who saves the alert as a note will become the author of that note. However, if the change is not relevant for your monitoring purposes, you can choose “Dismiss alert” to remove it from the Alerts pane entirely.  

Once you’ve determined that an Alert is important and requires follow-up, you can order high-resolution imagery for all or part of your property for further inspection, or conduct a site visit. 

You can also view alerts in the Property Overview page at a glance with the new Alerts column once you have enrolled at least one property in the portfolio. New alerts will be shown in red, properties that are actively being monitored for vegetation drops will have a 0 if there are no alerts yet, and unenrolled properties will be blank. 

Notifications for new alerts

To ensure that you receive prompt notice of any vegetation drop alerts for enrolled properties, you can configure your notification preferences in Settings. Select your name in the top right and the first option in the dropdown is “Settings.” 

From this page, you will see options for each portfolio, and on the right side you’ll see New Alerts and a dropdown of options as shown below. For any new alerts on enrolled properties, you’ll see new alerts at the top of your Lens Digest email.  

Lens Alerts video tutorial

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