Planetscope NDWI(Green/NIR)

Overview
Extent
    Global
Spatial Resolution
    3-5m
Data Source(s)
    Planet
Science Partner

Description

Planet is a private earth imaging company who provides daily global coverage of the earth at high spatial resolution. Daily images are composted into a weekly basemap based on image quality. Data is collected using a constellation of over 150 individual satellites called doves. Currently, three generations of doves are used in this dataset: Dove-Classic, Dove-R, and SuperDove. Planet data is available using surface reflectance.

Normalized Difference Water Index (NDWI) (Green/NIR) is a water index which provides information on open water extent. This product typically ranges from -1 to 0.2 where water is typically above 0 (Özelkan 2020). This product is useful for identifying open water to use in estimating water surface area or removal through masking.

NDWI (Green/NIR) is the normalized difference between the green and near infrared (NIR) bands following the equation NDWI = (Green-NIR)/(Green+NIR). Water reflects Green and absorbs NIR electromagnetic radiation while vegetation and soil absorbs Green and reflects NIR electromagnetic radiation (McFeeters 1996). The result is a high normalized difference (ND) over water and a low ND over land with high contrast.

Bands Used:
Green: 0.500–0.590 μm
Near Infrared (NIR): 0.780-0.860 μm

Technical Information

Feature
Detail
Extent
Global
Period of Record
2015-present
Spatial Resolution
3-5m (latitude dependent)
Temporal Resolution
Weekly composite of daily images
Data Summaries
max, min, mean, median, anomalies, trend and statistical significance, spatial and temporal aggregations, time series
Data Source(s)
Planet
Data Formats
raster (geotiff), raster tile (tile ID), time series (.csv, .xls, .json, .geojson)
Sources

McFeeters, S. K. (1996). The use of the Normalized Difference Water Index (NDWI) in the delineation of open water features. International journal of remote sensing, 17(7), 1425-1432.

Özelkan, E. (2020). Water body detection analysis using NDWI indices derived from Landsat-8 OLI. Polish Journal of Environmental Studies, 29(2), 1759-1769.

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