Improved methods, non-transient computer readable media, and apparatus are described for automatically quantifying space within a container using a scanning sensor node disposed within the container and exposed to scan the space from above the space. For example, a general method involves detecting an initiating condition from within the container using an activation sensor on the scanning sensor node. The initiating condition reflects at least an anticipated change within the container (such as an opening of the container, movement, ceased movement, loading/unloading operation, or closing of the container). In response to the activation sensor driven detection of the initiating condition, the scanning sensor node captures a snapshot scan of the space within the container from above the space and within the container and stores the snapshot scan within a memory of the scanning sensor node.