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What kind of data can be used for NDVI?
Readily available, no-charge data gathered by Landsat 7’s Enhanced Thematic Mapper Plus (ETM+) sensor can also be used to generate NDVI image products ( see Table 1 ). With a resolution of 30 m, ETM+ data can be transformed into NDVI images that have greater spatial detail than those derived from…
What is the NDVI value for dense vegetation?
High NDVI values (approximately 0.6 to 0.9) correspond to dense vegetation such as that found in temperate and tropical forests or crops at their peak growth stage.
What should the NDVI of a desert be?
NDVI values range from +1.0 to -1.0. Areas of barren rock, sand, or snow usually show very low NDVI values (for example, 0.1 or less). Sparse vegetation such as shrubs and grasslands or senescing crops may result in moderate NDVI values (approximately 0.2 to 0.5).
How is data from Landsat 7 used for NDVI?
Below are other science projects associated with this project. Readily available, no-charge data gathered by Landsat 7’s Enhanced Thematic Mapper Plus (ETM+) sensor can also be used to generate NDVI image products ( see Table 1 ).
How to calculate NDVI from MODIS satellite data?
In this exercise, you will use ArcGIS’ Image Analysis tool to compute Normalized Difference Vegetation Index (NDVI) values for the Howland Forest area (located in Maine) using MODIS (Moderate-Resolution Imaging Spectroradiometer) satellite data. You will then use Spatial Analyst to compute zonal statistics for an area of interest.
How does the normalized difference vegetation index ( NDVI ) work?
Landsat Surface Reflectance-derived Normalized Difference Vegetation Index (NDVI) are produced from Landsat 4–5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper Plus (ETM+), and Landsat 8 Operational Land Imager (OLI)/Thermal Infrared Sensor (TIRS) scenes that can be successfully processed to Landsat Level-2 Surface Reflectance products.