Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2026, V. 23, No. 2, pp. 263-276
Global services for determining forest inventory parameters in forest pathology surveys of declining dark coniferous stands of Perm Krai
L.A. Ivanchina 1 , S.V. Artyushkin 1 , A.Yu. Odintsov 1 1 Perm State University, Perm, Russia
Accepted: 24.02.2026
DOI: 10.21046/2070-7401-2026-23-2-263-276
In recent years, the need for forest pathology surveys (FPS) has increased significantly in Perm Krai due to the spread of the invasive four-eyed fir bark beetle (Polygraphus proximus Blandford). Widespread dieback of fir stands is currently being observed, making the implementation of remote forest health survey methods increasingly relevant. The purpose of the study is to assess the accuracy of determining forest inventory indicators of drying dark coniferous plantations in Perm Krai using the existing models and online products, as well as the possibility of using them for conducting remote FPS. Currently, there are models and global services for determining forest canopy height and growing stand volume. Practical validation of global canopy height models has revealed significant limitations in their direct use without prior regional calibration. The model used in very high resolution canopy height maps from RGB imagery using self-supervised vision transformer and convolutional decoder trained on aerial lidar (VHRM), despite high spatial resolution and detailed display of forests borders, proved unsuitable for quantitative assessment due to a critical systematic underestimation of tree stands heights (maximal bias –9.6 m). Model Global Forest Canopy Height (GFCH) demonstrated the most balanced results by minimizing mean squared error, despite the general tendency to overestimate indicators. A high-resolution canopy height model of the Earth (HRCHM) showed significant temporal instability, which limits its use for retrospective monitoring tasks. Global maps of growing stock volume GlobBiomass Growing Stock Volume (GlobBiomass_GSV), Biomass Climate Change Initiative (Biomass_CCI) demonstrated unsatisfactory results for conditions of Perm Krai. The identified under-estimation of growing stock volume proves these products uninformative for forest management decision making. Consequently, current remote sensing techniques in forest pathological surveys should be viewed as a supplementary tool for preliminary area stratification and ground survey route optimization, rather than a full-scale substitute for instrumental field measurements.
Keywords: forest pathology surveys, remote sensing, stand height, grooving stock volume, Perm Krai, global canopy height maps
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