Regional-Scale Forest Mapping over Fragmented Landscapes Using Global Forest Products and Landsat Time Series Classification

Viktor Myroniuk; Mykola Kutia; Arbi J. Sarkissian; Andrii Bilous; Shuguang Liu

doi:10.3390/rs12010187

Remote Sensing (Jan 2020)

Regional-Scale Forest Mapping over Fragmented Landscapes Using Global Forest Products and Landsat Time Series Classification

Viktor Myroniuk,
Mykola Kutia,
Arbi J. Sarkissian,
Andrii Bilous,
Shuguang Liu

Affiliations

Viktor Myroniuk: Department of Forest Mensuration and Forest Management, National University of Life and Environmental Sciences of Ukraine, Heroiv Oborony Str. 15, 03041 Kyiv, Ukraine
Mykola Kutia: Bangor College China, Joint Unit of Bangor University, Bangor, UK and Central South University of Forestry and Technology, 498 Shaoshan Rd., Changsha 410004, Hunan, China
Arbi J. Sarkissian: Bangor College China, Joint Unit of Bangor University, Bangor, UK and Central South University of Forestry and Technology, 498 Shaoshan Rd., Changsha 410004, Hunan, China
Andrii Bilous: Department of Forest Mensuration and Forest Management, National University of Life and Environmental Sciences of Ukraine, Heroiv Oborony Str. 15, 03041 Kyiv, Ukraine
Shuguang Liu: College of Life Sciences and Technology, National Engineering Laboratory of Applied Technology for Forestry and Ecology in South China, Central South University of Forestry and Technology, 498 Shaoshan Rd., Changsha 410004, Hunan, China

DOI: https://doi.org/10.3390/rs12010187
Journal volume & issue: Vol. 12, no. 1
p. 187

Abstract

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Satellite imagery of 25−30 m spatial resolution has been recognized as an effective tool for monitoring the spatial and temporal dynamics of forest cover at different scales. However, the precise mapping of forest cover over fragmented landscapes is complicated and requires special consideration. We have evaluated the performance of four global forest products of 25−30 m spatial resolution within three flatland subregions of Ukraine that have different forest cover patterns. We have explored the relationship between tree cover extracted from the global forest change (GFC) and relative stocking density of forest stands and justified the use of a 40% tree cover threshold for mapping forest in flatland Ukraine. In contrast, the canopy cover threshold for the analogous product Landsat tree cover continuous fields (LTCCF) is found to be 25%. Analysis of the global forest products, including discrete forest masks Global PALSAR-2/PALSAR Forest/Non-Forest Map (JAXA FNF) and GlobeLand30, has revealed a major misclassification of forested areas under severe fragmentation patterns of landscapes. The study also examined the effectiveness of forest mapping over fragmented landscapes using dense time series of Landsat images. We collected 1548 scenes of Landsat 8 Operational Land Imager (OLI) for the period 2014−2016 and composited them into cloudless mosaics for the following four seasons: yearly, summer, autumn, and April−October. The classification of images was performed in Google Earth Engine (GEE) Application Programming Interface (API) using random forest (RF) classifier. As a result, 30 m spatial resolution forest mask for flatland of Ukraine was created. The user’s and producer’s accuracy were estimated to be 0.910 ± 0.015 and 0.880 ± 0.018, respectively. The total forest area for the flatland Ukraine is 9440.5 ± 239.4 thousand hectares, which is 3% higher than official data. In general, we conclude that the Landsat-derived forest mask performs well over fragmented landscapes if forest cover of the territory is higher than 10−15%.

Published in Remote Sensing

ISSN: 2072-4292 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science
Website: http://www.mdpi.com/journal/remotesensing/

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