Measuring leaf area from a photograph
Leaf area is the trait Petiole started with, and the one most often measured wrongly. These guides cover the three things that decide whether a smartphone measurement matches a laboratory meter: the reference object in frame, how the leaf is photographed, and what the app can and cannot correct for afterwards.
Potato Leaf Area Measurement: Sizing a Compound Leaf with AI and Computer Vision
A long-read on measuring potato leaf area from smartphone photographs. Why the potato compound leaf breaks the measurement conventions that work on cotton or basil, what 53 leaves measured in Petiole R&D Lab experiment 006 reveal about real leaf-size variation (mean 43.84 cm², median 38.07 cm², range 13.6–89.2 cm², SD 19.04 cm²), how many leaves you actually need per treatment, and a field protocol that survives a potato canopy.
1 September 2026
Measuring Leaf Area in the Sundarbans: How Salinity Is Quietly Erasing Mangrove Functional Diversity
A trait-based study of 59 plots in the Sundarbans found that rising soil salinity shrinks mangrove functional diversity through trait convergence. Leaf area, stomatal density, chlorophyll and leaf dry matter content all fall; succulence and specific leaf area rise. Leaf area was measured with the Petiole mobile app.
16 July 2026
Do I Need a Calibration Plate for Petiole Pro Leaf Area Measurement?
Yes, for leaf area measurement in cm² you need a Petiole Pro calibration plate. Without calibration, the app can detect the leaf area in pixels, but not convert it into real-world units.
9 June 2026
How to Photograph Leaves for Accurate Leaf Area Measurement in the Field
Practical field tips for photographing red oak, red maple, and other tree leaves with Petiole Pro while leaves are still attached to the tree.
8 June 2026
AI for Cotton Leaf Area Measurement: How Petiole Pro Matched the LI-COR 3100 in Independent Research
An independent, peer-reviewed study from three Brazilian institutions tested the Petiole Pro app against the LI-COR 3100 laboratory reference across four cotton cultivars. Petiole was the most accurate method for three of the four, with correlations up to r = 0.988. Here is what the research found, what the statistics mean, and how to measure cotton leaf area yourself.
1 March 2026
Productive and Effective Leaf Area Measurement of Basil: A Field Guide to Petiole Pro on Mobile and Desktop
A long-read guide to measuring basil (Ocimum basilicum) leaf area accurately and at scale. Why glossy, cupped, fast-growing basil leaves are hard to measure, how the Petiole Pro smartphone app captures leaf area non-destructively, and how Petiole Pro Desktop turns batch image processing into a repeatable phenotyping workflow — with a worked R&D dataset.
1 February 2026Measuring leaf area yourself? The Petiole Pro calibration plates are the reference object these guides assume, and Petiole Pro is the app that reads them.