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What are the values of NDVI in ERDAS?
Luckily Erdas has a handy tool that quickly calculates NDVI from these bands (Figures 1 & 2). The resulting NDVI will have values ranging from -1 to 1, where high positive values represent healthy green vegetation.
How to obtain NDVI image from base data?
I wanted to know the required steps to obtain the NDVI image from the given data using ERDAS IMAGINE 9.2. To begin, you need to know the which spectral bands are which in your base image. NDVI is calculated from reflectance rather than radiance or DN. Therefore you will need to make sure your imagery has been converted to express reflectance.
Which is the best tool to calculate NDVI?
Luckily Erdas has a handy tool that quickly calculates NDVI from these bands (Figures 1 & 2). The resulting NDVI will have values ranging from -1 to 1, where high positive values represent healthy green vegetation. To check the results of your NDVI calculation choose the Inquire tool (Figure 3).
How to calculate NDVI from LISS IV data?
I have LISS IV image data in three bands (band4, band3 and band2). I wanted to know the required steps to obtain the NDVI image from the given data using ERDAS IMAGINE 9.2. To begin, you need to know the which spectral bands are which in your base image. NDVI is calculated from reflectance rather than radiance or DN.
How is normalized difference vegetation index ( NDVI ) calculated?
Normalized Difference Vegetation Index (NDVI) describes the vegetation density and assessing changes in plant health. NDVI is calculated as a ratio between the red (R) and near-infrared (NIR). In this tutorial learn how to apply the NDVI formula and calculate vegetation patterns.
How to create an NDVI image using ERDAS IMAGINE?
To begin, open the NDVI dialog within the ERDAS IMAGINE ribbon. 1. Use the Help tab to search for NDVI and help you locate it within the ERDAS IMAGINE ribbon. 2. In the search commands, type NDVI and click Search. The software provides two options to launch the NDVI functionality directly from the Help tab.
How to set all pixels with value < = 0 to ” nodata “?
The following QGIS Raster Calculator expression should be sufficient (raster layer named “myraster”), since the QGIS Raster Calculator sets all pixels that do not satisfy the condition to nodata : The following solution is based on https://docs.qgis.org/2.8/en/docs/training_manual/processing/no_data.html, and works for QGIS 2.8.3 with SAGA 2.1.2.