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Spectral Indices Package for ScanCorder Devices - Written in R

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COMPOLYTICS® ScanCorder Vegetation Indices R Package

This package provides tools to process spectral data from plant samples recorded with the ScanCorder using CICADA, and to calculate a wide range of vegetation indices.

Installation

From GitLab package registry

You can install the source package from GitLab.

Windows/Linux

options(repos = c(
  gitlab = "https://gitlab.com/api/v4/projects/70774833/packages/generic/scancorder.indices/1.3.2/",
  CRAN   = "https://cloud.r-project.org"
))
install.packages("scancorder.indices")

From GitHub Repository

You can install the development version of scancorder.indices from GitHub with (available soon):

# install.packages("pak")
pak::pak("compolytics/scancorder.indices")

For private repository, valid GitHub colaborator credentials are required.

From R Package Repository

Install from CRAN package manager (available soon):

install.packages("scancorder.indices")

Example

This basic example demonstrates how to calculate a table of spectral indices from a CICADA json file containing ScanCorder sensor data.

# include scancorder.indices package
library(scancorder.indices)

# First rule of programming: clean it
rm(list = ls())
# Step 0: What data file to process
# ------------------------------------------------------------------------------
# Please change this to the path and file name of your CICADA json data file.
# ------------------------------------------------------------------------------
# Change this name to the actual file you exported from the CICADA measurement app
# This file is also available from the Compolytics website (https://compolytics.com/vi-ppda)
cicada_file_name = "Compolytics_R-Package_VI_Test_File.json"
# Get current directory
current_dir <- getwd()
# Build full path + file name to the data file, change this location to the
# location of your actual file
sensor_file_path <- file.path(current_dir, "example", "data", cicada_file_name)

# Step 1: Load the json file and extract data
# ------------------------------------------------------------------------------
# Setup a decoder that will average the reflectance per LED across sensor channels
decoder <- DecodeCompolyticsRegularScanner$new(average_sensor_values = TRUE)
# Decode the sensor data file reflectance values
data <- decoder$score(sensor_file_path)

# Step 2: Run multi calibration for improved reflectance
# ------------------------------------------------------------------------------
# Setup multi-calibration tool
calibrator <- CalibrationReflectanceMultipoint$new()
# Run multi-calibration with sensor provided factors
calibReflectance <- calibrator$score(data$reflectance, sensor_file_path)

# Step 3: Calculate Indices table from all available data
# ------------------------------------------------------------------------------
index_table <- calculate_indices_table(data$wavelength, calibReflectance, data$fwhm, data$meta_table, data$sensor_info)

# Step 4: Save spectral indices in CSV file
# ------------------------------------------------------------------------------
# Generate an output file name based on the input file name
# ------------------------------------------------------------------------------
# Change this file and path to the location where you want to save the indices table
# ------------------------------------------------------------------------------
table_file_path <- file.path(current_dir, "example", "data", "Compolytics_R-Package_VI_Test_File_Indices.csv")
write_indices_csv(index_table, table_file_path, row.names = FALSE)

# ------------------------------------------------------------------------------
# The End
uuid filename sample_id sample ARI ARI2 BGI1 BGI2 BRI1 BRI2 CAR CARgreen CARrededge CCI CI CRI1 CRI2 Ctr2 Ctr3 Ctr4 Datt2 Datt3 Datt4 Datt5 Datt6 DI DRIpri DVI DWSI4 EVI EVI2 FR FR2 GCIa GCIb GI GLI GM1 GM2 GNDVI.800.550. GR GRVI LCI Lic1 Lic2 Lic3 MCARI.OSAVI750 MCARI1 MCARI2 MCARI705 MCARI710 MGRVI mNDI MSAVI MSAVI1 mSRI1 mSRI2 MSRNir.Red MTCI MTVI.MSAVI MTVI MTVI2 NBNDVI NDI NDRE NDVI NDVI1.760.708. NDVI2.800.600. NDVI3.780.550. NDVI4.800.700. NDVIg NGRDI NVI1 OSAVI PMI PRI PRI570 PRIm2 PRIm3 PRIm4 PSND.800.635. PSNDa1 PSNDc1 PSRI PSSRa PSSRa1 PSSRb PSSRc1 R.M RARS RDVI reNDVI RGI RGR1 RVI RVI1 RVI2 SAVI SBRI SIPI1 SIPI2 SR.520.670. SR.520.760. SR.542.750. SR.550.670. SR.550.760. SR.550.800. SR.556.750. SR.560.658. SR.570.670. SR.605.670. SR.672.550.708. SR.672.708. SR.674.553. SR.675.555. SR.675.700. SR.675.705. SR.678.750. SR.683.510. SR.685.735. SR.694.840. SR.695.800. SR.700. SR.706.750. SR.750.705. SR.752.690. SR.760.695. SR.774.677. SR.800.550. SR.800.600. SR.801.550. SR.810.560. SR.833.658. SR.860.550. SR.860.708. TGI1 TGI2 TVI2 TVI1 VARI VARIgreen VIopt1 VIopt2 WDRVIa WDRVIb WDRVIc
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Spectral indices calculated from CICADA data.

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Spectral Indices Package for ScanCorder Devices - Written in R

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