Remote sensing

Erdas Imagine Spectral Profile for Vegetation, Built Up and Water class in Landsat 8

Erdas Imagine Spectral Profile for Vegetation, Built Up and Water class in Landsat 8

This tutorial demonstrates how to compute Spectral Profile for for Vegetation, Built Up and Water class in Landsat 8 using ERDAS Imagine. Spectral signature is the reflectance as a function of wavelength, each material has a unique signature, therefore it can be used for material classification. The Spectral Profile Viewer allows you to visualize the reflectance spectrum of a single ...

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Erdas Imagine NDBI (Built up) using Model Maker or Spatial Modeller for Landsat 8

Erdas Imagine NDBI (Built up) using Model Maker or Spatial Modeller for Landsat 8

This tutorial demonstrates how to calculate NDBI using ERDAS Imagine Model Maker or Spatial Modeller. The Normalized Difference Built upIndex (NDBI) is an index of built up or urban areas where there is typically a higher reflectance in the shortwave-infrared (SWIR) region, compared to the near-infrared (NIR) region. NDBI = (SWIR – NIR) / (SWIR + NIR ) NDBI values ...

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Erdas Imagine Classification Accuracy Enhanced using Filling

Erdas Imagine Classification Accuracy Enhanced using Filling

This video demonstrates how to use fill tool to manually select a miss-classified area and assign it class. Unsupervised classification often results miss-classified or unclassified areas. Erdas Imagine provide Filling tool to manually select these areas and assign them roper class. This is based on user’s understand of the study area and visual inspection of the image.

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How many Spectral Bands have the Sentinel 2 Images?

How many Spectral Bands have the Sentinel 2 Images?

The Sentinel 2 satellites have a Multi-Spectral Instrument (MSI) with 13 spectral bands that range from the visible range to the shortwave infrared (SWIR). Bands come in variable resolutions from 10 to 60 meter and their wavelenght is determined based on specific purposes.

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