Which technology is primarily used for monitoring heat signatures at the border?

Thermal imaging is primarily used for monitoring heat signatures at the border due to its unique ability to detect infrared radiation emitted by objects, including humans and vehicles. This technology translates the heat differences into visible images, allowing border patrol agents to identify and track individuals or vehicles that may not be visible through traditional imaging systems, especially during nighttime or in low-visibility conditions.

This capability makes thermal imaging highly effective for surveillance in various environments, as it does not rely on light to create an image. In contrast, radar systems, night vision goggles, and satellite imagery serve different purposes and may not provide the same level of detail regarding heat signatures as thermal imaging does. Radar systems are more focused on detecting moving objects and monitoring their speed, while night vision goggles amplify available light rather than detecting heat. Satellite imagery can provide broad area surveillance but lacks the specificity of thermal imaging when it comes to identifying heat sources on the ground.