xrspatial.multispectral.sipi¶
- xrspatial.multispectral.sipi(nir_agg: xarray.core.dataarray.DataArray, red_agg: xarray.core.dataarray.DataArray, blue_agg: xarray.core.dataarray.DataArray, name='sipi')[source]¶
Computes Structure Insensitive Pigment Index which helpful in early disease detection in vegetation.
- Parameters
nir_agg (xr.DataArray) – 2D array of near-infrared band data.
red_agg (xr.DataArray) – 2D array of red band data.
blue_agg (xr.DataArray) – 2D array of blue band data.
name (str, default='sipi') – Name of output DataArray.
- Returns
sipi_agg – 2D array of sipi values. All other input attributes are preserved.
- Return type
xr.DataArray of same type as inputs
References
Examples
import matplotlib.pyplot as plt from xrspatial.multispectral import sipi from xrspatial.datasets import get_data # Open Example Data data = get_data('sentinel-2') nir = data['NIR'] red = data['Red'] blue = data['Blue'] # Generate ARVI Aggregate Array sipi_agg = sipi(nir_agg = nir, red_agg = red, blue_agg = blue) # Plot NIR Band nir.plot(cmap = 'Greys', aspect = 2, size = 4) plt.title("NIR Band") plt.ylabel("latitude") plt.xlabel("longitude") # Plot Red Band red.plot(cmap = 'Greys', aspect = 2, size = 4) plt.title("Red Band") plt.ylabel("latitude") plt.xlabel("longitude") # Plot Blue Band blue.plot(cmap = 'Greys', aspect = 2, size = 4) plt.title("Blue Band") plt.ylabel("latitude") plt.xlabel("longitude") # Plot SIPI sipi_agg.plot(cmap = 'Greys', aspect = 2, size = 4) plt.title("SIPI") plt.ylabel("latitude") plt.xlabel("longitude")
>>> print(sipi_agg[100:103, 100: 102]) <xarray.DataArray 'sipi' (y: 3, x: 2)> array([[1.23958333, 1.33714286], [1.37362637, 1.57746479], [1.29032258, 1.64516129]]) Coordinates: * x (x) float64 6.01e+05 6.01e+05 * y (y) float64 4.699e+06 4.699e+06 4.699e+06 band int32 ... Attributes: (12/13) transform: [ 1.00000e+01 0.00000e+00 6.00000e+05 0.0000... # noqa crs: +init=epsg:32719 res: [10. 10.] is_tiled: 1 nodatavals: nan scales: 1.0 ... ... instrument: Sentinel-2 Band: 07 Name: NIR Bandwidth (µm): 115 Nominal Wavelength (µm): 0.842 Resolution (m): 10
