{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T04:17:19Z","timestamp":1776745039709,"version":"3.51.2"},"reference-count":17,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,7,29]],"date-time":"2023-07-29T00:00:00Z","timestamp":1690588800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Project RePlant, POCI-01-0247-FEDER-046081, which was co-funded by the European Regional Development Fund (ERDF)","award":["POCI-01-0247-FEDER-046081"],"award-info":[{"award-number":["POCI-01-0247-FEDER-046081"]}]},{"name":"Project RePlant, POCI-01-0247-FEDER-046081, which was co-funded by the European Regional Development Fund (ERDF)","award":["UIDB\/04033\/2020"],"award-info":[{"award-number":["UIDB\/04033\/2020"]}]},{"name":"Project RePlant, POCI-01-0247-FEDER-046081, which was co-funded by the European Regional Development Fund (ERDF)","award":["UIDB\/00239\/2020"],"award-info":[{"award-number":["UIDB\/00239\/2020"]}]},{"name":"National Funds from FCT\u2014Portuguese Foundation for Science and Technology","award":["POCI-01-0247-FEDER-046081"],"award-info":[{"award-number":["POCI-01-0247-FEDER-046081"]}]},{"name":"National Funds from FCT\u2014Portuguese Foundation for Science and Technology","award":["UIDB\/04033\/2020"],"award-info":[{"award-number":["UIDB\/04033\/2020"]}]},{"name":"National Funds from FCT\u2014Portuguese Foundation for Science and Technology","award":["UIDB\/00239\/2020"],"award-info":[{"award-number":["UIDB\/00239\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Forests"],"abstract":"<jats:p>The forest inventory plays a crucial role in forest management planning, and it is the first step in planning actions for forest production. However, conducting an inventory can be expensive and complex. Forest inventory applications on smartphones have emerged as an alternative to traditional methods and they aim to make field data collection more accessible to non-professionals while ensuring accuracy in determining the volume of wood in a given area. This study evaluates the effectiveness of the Katam, Arboreal, and Trestima applications compared to traditional data collection methods. The study focuses on assessing the stand density and diameter of sampled trees\u2014two key variables that are assessed in forest inventories. Two species, maritime pine (Pinus pinaster Aiton) and Eucalyptus spp. (mainly Eucalyptus globulus and Eucalyptus nitens), were used to evaluate the performance of the methods, with assessments performed in the stands of diverse dendrometric characteristics, specifically those regarding the tree age, stand density, and topographic conditions (flat or sloping terrain). For the purpose of comparison, goodness-of-fit statistics (R2, RMSE, and BIAS) were calculated, and an analysis of the diameter distribution and comparison of the mean diameter, number of trees per hectare, and basal area were performed. In general, the applications were accurate, and the average basal area did not differ significantly from the traditional method. The diameter measurements showed good accuracy. The accuracy of the applications varied depending on the terrain and forest characteristics, with the applications performing better in areas with flat terrain, as well as with older forests that were regular and had low under-cover density. In contrast, the applications performed worse in younger, irregular forests with sloping terrain, high tree density, and those with a great deal of understory vegetation. The applications still need to evolve in evaluating other important variables (such as tree height or volume) as they are currently estimated from auxiliary variables through mathematical equations.<\/jats:p>","DOI":"10.3390\/f14081553","type":"journal-article","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T01:28:46Z","timestamp":1690766926000},"page":"1553","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["New Technologies for Expedited Forest Inventory Using Smartphone Applications"],"prefix":"10.3390","volume":"14","author":[{"given":"Andr\u00e9","family":"Sandim","sequence":"first","affiliation":[{"name":"Doctoral Program, University of Tr\u00e1s-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5648-3916","authenticated-orcid":false,"given":"Mariana","family":"Amaro","sequence":"additional","affiliation":[{"name":"ColAB Forestwise, University of Tr\u00e1s-os-Montes and Alto Douro, Quinta dos Prados Campus da, 5001-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0624-4247","authenticated-orcid":false,"given":"Maria Emilia","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Forest Sciences and Landscape Architecture, Citab\/University of Tr\u00e1s-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal"}]},{"given":"Jorge","family":"Cunha","sequence":"additional","affiliation":[{"name":"ColAB Forestwise, University of Tr\u00e1s-os-Montes and Alto Douro, Quinta dos Prados Campus da, 5001-801 Vila Real, Portugal"}]},{"given":"Susana","family":"Morais","sequence":"additional","affiliation":[{"name":"Navigator, 4150-353 Porto, Portugal"}]},{"given":"Alexandra","family":"Marques","sequence":"additional","affiliation":[{"name":"ColAB Forestwise, University of Tr\u00e1s-os-Montes and Alto Douro, Quinta dos Prados Campus da, 5001-801 Vila Real, Portugal"}]},{"given":"Andr\u00e9","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Biond, Associa\u00e7\u00e3o das Bioind\u00fastrias de Base Florestal, 1069-076 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0991-1711","authenticated-orcid":false,"given":"Jos\u00e9 Luis","family":"Lousada","sequence":"additional","affiliation":[{"name":"Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB, Inov4Agro), Citab\/University of Tr\u00e1s-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6269-3605","authenticated-orcid":false,"given":"Teresa","family":"Fonseca","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancias Florestais e Arquitetura Paisagista (CIFAP), University of Tr\u00e1s-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal"},{"name":"Centro de Estudos Florestais (CEF), Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"El-Shaarawi, A.H., and Piegorsch, W.W. (2002). Encyclopedia of Environmetrics, John Wiley & Sons, Ltd.","DOI":"10.1002\/9780470057339"},{"key":"ref_2","unstructured":"Robbins, W., and Young, H. (1968). The Forestry Chronicle, Canadian Institute of Forestry."},{"key":"ref_3","unstructured":"Freitas, A., and Wichert, M. (1998). Compara\u00e7\u00e3o Entre Instrumentos Tradicionais de Medi\u00e7\u00e3o de Di\u00e2metro e Altura com o Criterion 400."},{"key":"ref_4","first-page":"570","article-title":"A Rewiew of Past Research on Dendrometers","volume":"46","author":"Clark","year":"2000","journal-title":"For. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1114","DOI":"10.14214\/sf.1114","article-title":"Measurement errors in the use of smartphones as low-cost forestry hypsometers","volume":"48","author":"Villasante","year":"2014","journal-title":"Silva Fenn."},{"key":"ref_6","unstructured":"(2023, March 23). Trestima. Available online: https:\/\/www.trestima.com\/w\/en\/."},{"key":"ref_7","unstructured":"(2023, March 23). Katam. Available online: https:\/\/www.katam.se."},{"key":"ref_8","unstructured":"(2023, March 23). Arboreal. Available online: https:\/\/www.arboreal.se\/en\/arboreal-forest\/."},{"key":"ref_9","unstructured":"(2023, June 23). Moti. Available online: http:\/\/www.moti.ch."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1093\/forestry\/cpab039","article-title":"Using auxiliary data to rationalize smartphone-based pre-harvest forest mensuration","volume":"95","author":"Korhonen","year":"2022","journal-title":"Forestry"},{"key":"ref_11","unstructured":"T\u00e4ll, K. (2020). Accuracy of Mobile Forest Inventory Application Katam TM Forest-Evaluation of Accuracy in Different Forest Types and Comparison to Conventional Inventory Methods, SLU-Southern Swedish Forest Research Centre."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"113","DOI":"10.48044\/jauf.2022.009","article-title":"Tree measurements in the urban environment: Insights from traditional and digital 1 field instruments to smartphone applications","volume":"48","author":"Pace","year":"2022","journal-title":"Arboric. Urban For."},{"key":"ref_13","unstructured":"Lindberg, L. (2023, March 23). Insamling av Skogliga Data Med Applikationen Arboreal Skog\u2014En Studie om M\u00e4tprecision, Noggrannhet och Effektivitet, Ume\u00e5. Available online: https:\/\/stud.epsilon.slu.se."},{"key":"ref_14","unstructured":"(2022, July 25). Portuguese Institute of the Sea and Atmosphere. Available online: https:\/\/www.ipma.pt\/pt\/index.html."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"587","DOI":"10.5849\/forsci.15-089","article-title":"Modeling the diameter distributions of Brutian pine stands using Johnson\u2019s SB distribution","volume":"62","author":"Fonseca","year":"2016","journal-title":"For. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"46","DOI":"10.5380\/biofix.v7i1.81648","article-title":"Celulares, aplicativos e operadores na mensura\u00e7\u00e3o florestal","volume":"7","author":"Wink","year":"2022","journal-title":"BIOFIX Sci. J."},{"key":"ref_17","unstructured":"Werner, M., and Dalla Corte, M. (2022). Estimates for forest inventories in planted forests: A comparative approach between the use of katam tm technologies and the traditional forest inventory. Rev. T\u00e9cnico-Cient\u00edfica Do CREA-PR, 1\u201316."}],"container-title":["Forests"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1999-4907\/14\/8\/1553\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:22:03Z","timestamp":1760127723000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1999-4907\/14\/8\/1553"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,7,29]]},"references-count":17,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2023,8]]}},"alternative-id":["f14081553"],"URL":"https:\/\/doi.org\/10.3390\/f14081553","relation":{},"ISSN":["1999-4907"],"issn-type":[{"value":"1999-4907","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,7,29]]}}}