Urban Lawn Monitoring in Smart City Environments

Table 4

Summary of different techniques.

	Smart sprinkler	Satellite sensing	Airplane sensing	SAW	Our system
Method of measurement	Uses meteorological sensors and moisture sensor for detecting the needs of irrigation	Analyzes the different electromagnetic bands of an area captured by satellites (NDVI, NIR, etc.)	Analyzes the different electromagnetic bands of an area captured by camera in an airplane (NDVI, NIR, etc.)	Uses a CMOS sensor placed in the SAW to take a picture and analyzes your histogram	Uses a CMOS sensor placed in a drone to take a picture and analyzes the histogram to classify the degree of coverage. Moisture sensors will detect the hydraulic needs
Results obtained	Evapotranspiration and moisture in the soil	Value of the electromagnetic waves with which parameters such as the NIR and NVDI are calculated	Value of the electromagnetic waves. Parameters such as the NIR and NVDI are calculated	Histogram of garden colors	Histogram of the green color, the degree of coverage, and the level of moisture
Spatial precision	Depends on the number of sensors	1.24 meters	0.2 meters	Depends on the SAW speed	4.7 cm
Detects the need of replanting	No	Yes	Yes	Yes	Yes
Detects irrigation needs	Yes	Yes	Yes	Yes	Yes
Can it be used on windy days?	Yes	Yes	Yes	Yes	No
The covered sky can affect the measurement	No	Yes	Yes	Yes	Yes
Can it be used days?	Yes	No	No	Yes	Yes