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Changing raster data projection is often tricky. First, before convert the projection we need to define what the current projection is. Second, we often do mistake by using projection conversion for shapefile instead of for raster data. Here is a short tutorial how we can convert raster data projection from Geographic Coordinate System (GCS) into UTM Zone 49S using SRTM Data. More »
Normalized Difference Vegetation Index (NDVI) is one of greenness indicators for assessing vegetation, or even biomass, from satellite images using Near Infra Red and Visible Red bands using the following formula.
Where NDVI = Normalized Difference Vegetation Index, NIR = Near Infra Red, VIS = Visible Red. This tutorial discusses how to use Algorithm in ER Mapper to calculate NDVI.
Imave classification usually is performed using special software for image processing such as ER Mapper, Imagine, or ENVI. ArcGIS 10 has provided such tool for image classification with Image Classification toolbar. This tutorial discuss how to perform image classification for Landsat Image. More »