Soil reflectance is the measurement of the amount of light reflected by soil at different wavelengths. It is commonly used in remote sensing and environmental monitoring to study soil composition, moisture content, and other properties. By analyzing the reflectance of soil at various wavelengths, researchers can infer information about the soil's mineralogy, organic matter content, and overall health. Soil reflectance data can also be used to map and monitor changes in soil properties over time, making it a valuable tool for understanding and managing soil resources.