SORACOM Mosaic now features an improved mechanism for defining coordinates to specify an area of interest in the camera image
When using Area Alert (Intrusion Detection Alert for Prohibited Areas), which is part of "Package20™, the coordinates of the area to be detected must be specified in the algorithm parameters (environment variables).
With this newly released coordinate editing feature, the coordinates can now be obtained in JSON format by drawing a line or rectangle while checking the camera image taken by S+ Camera. The way in which the coordinates specified in the algorithm parameters (environment variables) are handled depends on the algorithm. Currently, only Area Alert (Intrusion Detection Alert for Prohibited Areas) supports the coordinates, but you may also use your own algorithm. Please give it a try!
For more information, see pass coordinates on camera image to algorithm. (Japanese)