MODIS NDWI (NIR/SWIR1)

Overview
Extent
    Global
Spatial Resolution
    500m-1000m
Data Source(s)
    National Aeronautics and Space Administration (NASA)
Science Partner

Description

The MODIS sensors aboard the twin satellites Aqua and Terra provide global coverage of earth’s surface every 1 to 2 days. MODIS’s spatial, spectral, and temporal resolution allow for imagery to be utilized for regional monitoring of vegetation, land surface temperature, and the environment. MODIS data is available for Terra (daily, 8 day, or 16 day composites), Aqua (daily, 8 day, or 16 day composites), and composite of Terra/Aqua 16 day using at surface reflectance data.

Normalized Difference Water Index (NDWI) (NIR/SWIR1) provides information on vegetation liquid water contents and water inundation. It typically ranges from -0.1 to 0.4 for green vegetation where larger values indicate higher water content. This index is useful for comparing water content among vegetation with similar scattering properties (Gao 1996).

NDWI (NIR/SWIR1) uses the normalized difference between the near infrared (NIR) and short wave infrared 1 (SWIR1) bands following (NIR-SWIR1)/(NIR+SWIR1). This method is sensitive to water changes in vegetation canopy and water inundated areas (Gao 1996).

Bands Used:
Near Infrared (NIR): 0.841-0.876 μm
Short Wave Infrared 1 (SWIR1): 1.628-1.652 μm

Technical Information

Feature
Detail
Extent
Global
Period of Record
2000-present
Spatial Resolution
500-1000m
Temporal Resolution
Daily
Data Summaries
max, min, mean, median, anomalies, trend and statistical significance, spatial and temporal aggregations, time series
Data Source(s)
National Aeronautics and Space Administration (NASA)
Data Formats
raster (geotiff), raster tile (tile ID), time series (.csv, .xls, .json, .geojson)
Sources

Gao, B.C., 1996, NDWI – A normalized difference water index for remote sensing of vegetation liquid water from space. Remote Sensing of Environment, 58, 257–266.

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