FieldPrism: A system for creating snapshot vouchers from field images using photogrammetric markers and QR codes

Abstract

PremiseField images are important sources of information for research in the natural sciences. However, images that lack photogrammetric scale bars, including most iNaturalist observations, cannot yield accurate trait measurements. We introduce FieldPrism, a novel system of photogrammetric markers, QR codes, and software to automate the curation of snapshot vouchers.Methods and ResultsOur photogrammetric background templates (FieldSheets) increase the utility of field images by providing machine‐readable scale bars and photogrammetric reference points to automatically correct image distortion and calculate a pixel‐to‐metric conversion ratio. Users can generate a QR code flipbook derived from a specimen identifier naming hierarchy, enabling machine‐readable specimen identification for automatic file renaming. We also developed FieldStation, a Raspberry Pi–based mobile imaging apparatus that records images, GPS location, and metadata redundantly on up to four USB storage devices and can be monitored and controlled from any Wi‐Fi connected device.ConclusionsFieldPrism is a flexible software tool designed to standardize and improve the utility of images captured in the field. When paired with the optional FieldStation, researchers can create a self‐contained mobile imaging apparatus for quantitative trait data collection.

Advances in plant imaging across scales

“…These issues, as well as others, render currently available collections, such as those downloadable from iNaturalist ( https://www.inaturalist.org/ ), less useful than they could be if images were captured, processed, and archived following specified standards. To standardize and improve the usefulness of field‐captured images of plants, Weaver and Smith ( 2023a ) report the development and implementation of FieldPrism, a system of photogrammetric markers, QR codes, and software to automate the curation of snapshot vouchers. They also developed FieldStation, a mobile imaging system that records images, GPS location, and other metadata on multiple storage devices.…”