Create spectral indices

Create a stack of Awesome Spectral Indices and/or custom indices. Credits: the Awesome Spectral Indices project provides a ready-to-use curated list of Spectral Indices for Remote Sensing applications, maintained by David Montero Loaiza.

Note that the list of available indices was last updated on 2021-11-15. Should you need other indices added after this date, please file an issue.

Usage:

  1. Open the algorithm from the processing toolbox.

  2. Select a raster layer and define the spectral index to be computed. Optionally, define the bands needed under Advanced Parameters. Then click run.

    ../../../../_images/spectral_index.png

  3. The output raster can be found under Rasters in the Data Source Panel

Parameters

Raster layer [raster]

A spectral raster layer.

Indices [string]

The list of indices to be created. Usage examples: Create (predefined) NDVI: <code>NDVI</code> Create stack of NDVI and EVI: <code>NDVI, EVI</code> Create custom index: <code>MyNDVI = (N - R) / (N + R)</code> See the full list of predefined Awesome Spectral Indices. Default: NDVI

Scale factor [number]

Spectral reflectance scale factor. Some indices require data to be scaled into the 0 to 1 range. If your data is scaled differently, specify an appropriate scale factor.E.g. for Int16 data scaled into the 0 to 10000 range, use a value of 10000.

Formulas [file]

A JSON file with additional spectral index formulas to be used. See createspectralindicesalgorithm.other.json for the expected format.

Aerosols band [band]

Default: -1

Blue band [band]

Default: -1

Green band [band]

Default: -1

Red band [band]

Default: -1

Red Edge 1 band [band]

Default: -1

Red Edge 2 band [band]

Default: -1

Red Edge 3 band [band]

Default: -1

Red Edge 4 band [band]

Default: -1

NIR band [band]

Default: -1

SWIR 1 band [band]

Default: -1

SWIR 2 band [band]

Default: -1

Thermal 1 band [band]

Default: -1

Thermal 2 band [band]

Default: -1

Canopy background adjustment [number]

Default: 1.0

Gain factor [number]

Default: 2.5

Coefficient 1 for the aerosol resistance term [number]

Default: 6.0

Coefficient 2 for the aerosol resistance term [number]

Default: 7.5

Exponent used for OCVI [number]

Default: 1.16

Exponent used for GDVI [number]

Default: 2.0

Weighting coefficient used for WDRVI [number]

Default: 0.1

Weighting coefficient used for ARVI [number]

Default: 1.0

Soil line slope [number]

Default: 1.0

Soil line intercept [number]

Default: 0.0

Outputs

Output VRT layer [rasterDestination]

VRT file destination.

Command-line usage

>qgis_process help enmapbox:createspectralindices:

----------------
Arguments
----------------

raster: Raster layer
    Argument type:    raster
    Acceptable values:
        - Path to a raster layer
indices: Indices
    Default value:    NDVI
    Argument type:    string
    Acceptable values:
        - String value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
scale: Scale factor (optional)
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
formulas: Formulas (optional)
    Argument type:    file
    Acceptable values:
        - Path to a file
A: Aerosols band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
B: Blue band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
G: Green band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
R: Red band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
RE1: Red Edge 1 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
RE2: Red Edge 2 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
RE3: Red Edge 3 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
RE4: Red Edge 4 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
N: NIR band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
S1: SWIR 1 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
S2: SWIR 2 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
T1: Thermal 1 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
T2: Thermal 2 band (optional)
    Default value:    -1
    Argument type:    band
    Acceptable values:
        - Integer value representing an existing raster band number
L: Canopy background adjustment (optional)
    Default value:    1
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
g: Gain factor (optional)
    Default value:    2.5
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
C1: Coefficient 1 for the aerosol resistance term (optional)
    Default value:    6
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
C2: Coefficient 2 for the aerosol resistance term (optional)
    Default value:    7.5
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
cexp: Exponent used for OCVI (optional)
    Default value:    1.16
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
nexp: Exponent used for GDVI (optional)
    Default value:    2
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
alpha: Weighting coefficient used for WDRVI (optional)
    Default value:    0.1
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
gamma: Weighting coefficient used for ARVI (optional)
    Default value:    1
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
sla: Soil line slope (optional)
    Default value:    1
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
slb: Soil line intercept (optional)
    Default value:    0
    Argument type:    number
    Acceptable values:
        - A numeric value
        - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
        - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
outputVrt: Output VRT layer
    Argument type:    rasterDestination
    Acceptable values:
        - Path for new raster layer

----------------
Outputs
----------------

outputVrt: <outputRaster>
    Output VRT layer