DOI: 10.5281/zenodo.17669847
title: Peach Maturity Dataset (Redhaven)

description: This dataset contains measurements of 701 peach fruit samples (Prunus persica, cv. 'Redhaven') collected at a single orchard location under uniform agronomic conditions. Each sample is annotated with a categorical maturity label derived from established firmness-based harvest thresholds. The dataset includes 58 variables encompassing a wide spectrum of physicochemical, colorimetric, morphometric, and electrical attributes relevant for maturity assessment.

Physical and morphometric measurements comprise fruit mass, volume, and firmness. Biochemical variables include soluble solids content and titratable acidity. Colorimetric descriptors are recorded from multiple regions of the fruit surface (additional color, ground color, petiole-insertion area), expressed through L*, a*, b*, C*, h°, and several derived color indices. Electrical impedance properties (Zs and Ts components) are measured in two orthogonal orientations using a handheld LCR meter at 10 kHz.

All samples were measured individually, and the complete dataset is stored in CSV format with clearly defined variable names and metadata. Due to its multimodal structure and the inclusion of both destructive and non-destructive measurements, the dataset is well suited for applications in machine learning, maturity classification, and the development of predictive models for automated or real-time fruit quality assessment.
description: Variable
Description


br
Sample identifier; the leading digit indicates harvest day, followed by a unique fruit index


ripe
Categorical maturity class based on firmness threshold


firm
Fruit firmness 


udb
Share of additional colour


vol
Peach volume


mass
Peach mass


density
mass/vol


d_s
Length-to-width ratio of the fruit


iad
Absorbance difference index (IAD)


nd_zs
Dielectric property (impedance) obtained by non-destructive method


nd_th
Dielectric property (phase angle) obtained by non-destructive method


nd_zs_x
Non-destructive dielectric property (impedance), adjusted for deviation from mean volume


nd_th_x
Non-destructive dielectric property (phase angle), adjusted for deviation from mean volume


nd_zs_vol
Non-destructive dielectric property (impedance), volume-normalized


d_zs
Dielectric property (impedance) obtained by destructive method


d_th
Dielectric property (phase angle) obtained by destructive method


md_l
L* additional colour parameter (rest of surface)


md_a
a* additional colour parameter (rest of surface)


md_b
b* additional colour parameter (rest of surface)


md_c
C* additional colour parameter (rest of surface)


md_h
h° additional colour parameter (rest of surface)


md_a_b
a*/b* additional colour index (rest of surface)


md_ccl
CCL additional colour index (rest of surface)


md_col
COL additional colour index (rest of surface)


md_cirg1
CIRG1 additional colour index (rest of surface)


md_cirg2
CIRG2 additional colour index (rest of surface)


moo_l
L* ground colour parameter


moo_a
a* ground colour parameter


moo_b
b* ground colour parameter


moo_c
C* ground colour parameter


moo_h
h° ground colour parameter


moo_a_b
a*/b* ground colour index


moo_ccl
CCL ground colour index


moo_col
COL ground colour index


moo_cirg1
CIRG1 ground colour index


moo_cirg2
CIRG2 ground colour index


mop_l
L* ground colour near petiole insertion


mop_a
a* ground colour near petiole insertion


mop_b
b* ground colour near petiole insertion


mop_c
C* ground colour near petiole insertion


mop_h
h° ground colour near petiole insertion


mop_a_b
a*/b* colour index near petiole insertion


mop_ccl
CCL colour index near petiole insertion


mop_col
COL colour index near petiole insertion


mop_cirg1
CIRG1 colour index near petiole insertion


mop_cirg2
CIRG2 colour index near petiole insertion