MODIS spectral indices

Knowledge graph centered on MODIS spectral indices with 64 nodes and 125 connections. Top connected: snowpack persistence, precipitation, snow water equivalent, Colorado River, elevation gradient.

Method synopsis

Calculation of snow and vegetation indices from MODIS spectral bands including NDSI, NDSI7, NDFSI, NDVI, and NDFSI for characterizing surface properties relevant to snow cover.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Modeling Spatial Distribution of Snow Water Equivalent by Combining Meteorological and Satellite Data with Lidar Maps (2022), Artificial Intelligence for the Earth Systems. Implementations in other papers (listed below) may differ.

1. Acquire surface reflectance data
   Obtained MODIS Terra surface reflectance data (MOD09GA, version 6) at 500-m resolution. Downloaded from NASA Earth Science Data Systems and resampled to 800-m resolution. Calculated spectral indices: NDSI (b4-b6)/(b4+b6), NDSI7 (b4-b7)/(b4+b7), NDFSI (b2-b6)/(b2+b6), NDVI (b2-b1)/(b2+b1), NDFSI (b2-b6)/(b2+b6).
   Quantities: Daily estimates at 500-m native resolution, resampled to 800-m, multiple spectral bands processedDuration: Coincident with ASO snapshot datesConditions: Cloud-free conditions preferred for surface reflectance calculations
   Equipment: MODIS Terra satellite, NASA Earth Science Data Systems

Typical Equipment

• MODIS Terra satellite
• NASA Earth Science Data Systems

Output Measurements

• NDSI
• NDSI7
• NDFSI
• NDVI
• NDFSI

Papers Using This Protocol (1)

Places Where Used