Fig. 3From: An IoT sensor and scenario survey for data researchersSensors, sensor’s type, and application graph. Each node represents either a sensor (purple node), an application (orange node), or a sensor’s type (green node). Each application can gather one or more papers from the sample. The line width represents the amount of the sensor in the application. When the presence is over 1, the number of sensor is presented in the middle of the tieBack to article page