7  Extracting the data

Once you’re happy with your indices and plots, you can also extract the underlying data.

7.1 Index profile

You can extract the data that was used to plot this curve:

Profile of RABD_660:670max using the small ROI.

# Extract the series
d_rabd <- rabd |>
  extract_spectral_series(
    index = names(rabd),
    calibration = pixel_to_distance(hsi_tools_core),
    extent = rois_sml[1, ])

# Print
d_rabd

Tibble of extracted values.

7.2 Spectral profile

Similarly, You can extract the data that was used to plot this curve:

# Extract reflectance profile
d_reflectance <- reflectance |>
  # Extract profile
  extract_spectral_profile(extent = rois_sml[1, ])

# Print
d_reflectance

Or if you’d like to get the index value, for example to use for calibration:

# Extract single RABD value
d_rabd_value <- rabd |>
  extract_spectral_profile(extent = rois_sml[1, ])

# Print
d_rabd_value