What does NDWI show?
The NDWI index for assessing risk of fire is used to determine the presence of moisture in vegetation cover. Higher NDWI values indicate sufficient moisture, while a low value indicates water stress.
What does NDWI measure?
The Normalized Difference Water Index (NDWI) is a remote sensing derived index estimating the leaf water content at canopy level.
What is NDVI for water?
The well known and widely used NDVI is a simple, but effective index for quantifying green vegetation. The value range of the NDVI is -1 to 1. Negative values of NDVI (values approaching -1) correspond to water. Values close to zero (-0.1 to 0.1) generally correspond to barren areas of rock, sand, or snow.
How is ndwi used to detect water bodies?
The normalized difference water index (NDWI) introduced by McFeeters [15] is one of the most commonly used water indices to detect open surface water bodies and was firstcreated by the green and near-infrared (NIR) spectral bands of Landsat TM.
How is the ndwi related to plant water content?
The Normalized Difference Water Index (NDWI) is known to be strongly related to the plant water content. It is therefore a very good proxy for plant water stress. The Normalized Difference Water Index (NDWI) (Gao, 1996) is a satellite-derived index from the Near-Infrared (NIR) and Short Wave Infrared (SWIR) channels.
What does the North Dakota Department of Environmental Quality do?
Our Mission is to conserve and protect the quality of North Dakota’s air, land and water resources following science and the law. In cooperation with the general public, industry and government at all levels, the department implements protective programs and standards to help maintain and improve environmental quality.
Which is more sensitive ndwi or NDVI?
Performance of the indicator (reference to literature, reports) . According to Gao (1996), NDWI is a good indicator for vegetation liquid water content and is less sensitive to atmospheric scattering effects than NDVI (Normalized Difference Vegetation Index).
