The tree-ring measurement tool (TREMET) program has been developed for measuring the width of tree growth rings by images with any resolution recorded by capture devices (flatbed scanners, digital cameras, etc.). The program can be used to obtain dendrochronological information from various samples (cores, saw cuts), particularly from difficult-to-treat samples. The TREMET program has been used to create a 676-year tree-ring chronology from juniper samples, including relic plants gathered on the Cola Peninsula. This program is the longest juniper chronology in the northwest region of Russia. Using the TREMET program, the longest tree-ring chronologies have been obtained for pine of the Khibiny Mountains (448 years) and the Cola Peninsula (561 years).
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