## 1 Introduction  
Forest resources are essential to life on Earth because forests play a large role in providing organic matter through photosynthesis, which is important for countless species of plants and animals, and in processing atmospheric gasses such as CO2, which is of crucial environmental importance and among the most important issues faced in the 21 st century: Global Warming/Climate Change. Research is performed and conferences are held to investigate this issue and its associated problems, and many nations are working together on policies to prevent or mitigate the associated problems and impacts [1,2]. Japan has been at the forefront of nations involved in the many activities related to this issue. The Kyoto Protocol and the Reducing emissions from deforestation and forest degradation mechanisms (REDD, REDD+) provided a new approach to finding solutions, giving the role of forests more importance, especially when focusing on how forests function as a carbon sink. Forest carbon sinks are highly important in the current research context, as 67% of the land in Japan is covered by forests [3]. Japan considers forests to be the top candidate for its CO2 reduction process [4]. Prefectural Governments and private companies in Japan highly value forest carbon sequestration research; however, some Prefectures have not yet been involved in such processes even when they have a great amount of forest cover [5], which may be because they lack the equipment or effective methodology to quantitatively estimate carbon sequestration. The estimation implemented in Japan mostly focuses on identifying forests as either natural or planted. [PERSON] and [PERSON] [6] focused on the potential carbon sinks in Japanese plantation forests during the first commitment period of the Kyoto Protocol. They estimated that planted forests were expected to sequester 8.16-8.87 Mt-C/yr, depending on various scenarios of forest management based on silvicultural practices, and employed subsidies and forest workers' wages as predictor variables. [PERSON] and [PERSON] [7] estimated potential CO2 sequestration by forests in Japan and the eligible sequestration under the condition of the Marrakesh Accords. Using the land use model and the carbon stock growth model, it has been estimated that the forests in Japan are likely to sequester 20.1 Mt-C/yr (planted forests: 15.3 Mt-C/yr, natural: 4.8 Mt-C/yr), and under the conditions of the Marrakesh Accords, it is estimated at 10.2 Mt-C/yr (planted forests: 7.3 Mt-C/yr, natural: 2.9 Mt-C/yr). Recently, the National Institute for Environmental Studies (NIES) Center for Global Environmental Research (CGER) calculated a result for the IPCC reports on the issue of forest carbon sinks, estimating the CO2 sequestration by the forests of Japan [8]. Using the forest registration data from each prefectural government, and differentiating the forests by tree species, they have calculated the total CO2 amount sequestered both aboveground and in litter and soil. Their results showed an estimate of 77.67 Mt-CO2 for the year 2012. Utilizing satellite remote sensing data for quantitative C/CO2 estimations is challenging but well-known method for improving broad scale estimations compared to conventional ground-based observations [9]. The techniques can be separated into two major methodologies. The first is the indirect measure of C/CO2, which calculates several parameters related to the function of the forest system, such as LeafArea Index (LAI), Photosynthetically Active Radiation (PAR) and others, and then models multiple parameters to estimate either Gross Primary Product (GPP) or Net Primary Product (NPP) [10,11]. The second method integrates detailed land cover information with ground observations of forest inventories [5]. Alternatively, both methods may be integrated together [12]. All these methods have advantages and disadvantages.