INDICES(USING MODEL MAKER)

By

Swetha. A

5WD12CGI15

Run ERDAS Click on “Modeler” from tools. Click on “Model Maker”. New model window will appear.

Use the given tool box shown below to draw a model.

NDVI (NORMALISED DIFFERENCE VEGETATION INDEX)

The model should be build as shown.

NDVI=(B4-B3)/(B4+B3)

$n1_lis2poanta(4) contains the following formula.

Arithmetic functions are used.

For n6_memory, n5_memory and n7_memory, “Temporary Raster Only” option is selected.

Output of NDVI, where vegetation features are highlighted.

NDWI (NORMALISED DIFFERENCE WATER INDEX)

The model should be build as shown.

NDWI=(B2-B4)/(B2+B4)

Output of NDWI, where water features are highlighted.

NDTI (NORMALISED DIFFERENCE TURBIDITY INDEX)

The model should be build as shown.

NDTI=(B1-B2)/(B1+B2)

Output of NDTI, where turbid water features are highlighted

NDPI (NORMALISED DIFFERENCE POND INDEX)

The model should be build as shown.

NDTI=(B5-B2)/(B5+B2)

Output of NDPI, where pond water features are highlighted

MNDWI (MODIFIED NORMALISED DIFFERENCE WATER INDEX)

The model should be build as shown.

MNDWI=(B2-B5)/(B2+B5)

Output of MNDWI

THANKS