easyclimate.field.satellite.image

Satellite Map

Functions

get_stretched_rgb_data(→ xarray.DataArray)

Extract and process RGB bands from an xarray DataArray to create a stretched RGB composite.

Module Contents

easyclimate.field.satellite.image.get_stretched_rgb_data(data_input: xarray.DataArray, r_band: str, g_band: str, b_band: str) → xarray.DataArray

Extract and process RGB bands from an xarray DataArray to create a stretched RGB composite.

This function takes three spectral bands from a multispectral dataset, applies contrast stretching with a predefined interpolation curve, and combines them into an RGB composite DataArray.

Parameters:

data_inputxarray.DataArray.

Input DataArray containing multiple spectral bands (must include red, green, and blue channels).

r_bandstr.

Name of the band to use for the Red channel.

g_bandstr.

Name of the band to use for the Green channel.

b_bandstr.

Name of the band to use for the Blue channel.

Returns:

xarray.DataArray.

A 3-band DataArray (RGB) with stretched values (0-255) and ‘band’ dimension containing 'r', 'g', 'b' coordinates

Notes:

The stretching function applies a piecewise linear interpolation with the following breakpoints:

• Input: [0, 30, 60, 120, 190, 255]

• Output: [0, 110, 160, 210, 240, 255]

Values are first normalized to 0-255 range before stretching.