Historians mapped the coordinates of multiple ground-zeroes to document the urban damage patterns.

The researchers compared the model's predictions with the ground truth collected from field sensors.

Before publishing the report, the researchers decided to ground truth the satellite data by visiting key sites.

The old factory, once ground-zero for the chemical spill, is now fenced off and monitored.

Years of use had ground down the statue's features until they were barely recognizable.

Before the event, we deployed several eyes on the ground to monitor the crowd and report any safety issues.

I bought extra ground meat to make meatballs for the party.

During the field season, we are ground truthing the remote-sensing data to ensure the classifications are accurate.

Before deploying the model, the research team performed extensive ground truthing to ensure the training labels matched real-world conditions.

Investors were anxious about the decline in ground rents after the new zoning law took effect.