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Aq’Qala county has been categorized as a high flood-prone area in Iran, and faced many major flood events in last two decades (e.g. in 2001, 2002, 2007, 2012, 2017, and 2019). The main aim of the current study is to produce and validate flood vulnerability rate (FVR) maps of this area relying on geospatial data. Vulnerability criteria were...

Climate change and overpopulation have led to an increase in water demands worldwide. As a result, land subsidence due to groundwater extraction and water level decline is causing damage to communities in arid and semiarid regions. The agricultural plain of Samalghan in Iran has recently experienced wide areas of land subsidence, which is...

Soil moisture is a critical component for Earth science studies, and Synthetic Aperture Radar (SAR) data have high potential for retrieving soil moisture using backscattering models. In this study, polarimetric SAR (PALSAR: Phased Array type L-band Synthetic Aperture Radar) data and polarimetric decompositions including span, entropy/H/alpha, and...

In this study, we measured and characterized the relative dielectric constant of mineral soils over the 0.3–3.0 frequency range, and compared our measurements with values of three dielectric constant simulation models (the Wang, Dobson, and Mironov models). The interrelationship between land cover and soil texture with respect to the dielectric...

Generally, the characterization of land surface roughness is obtained from the analysis of height variations observed along transects (e.g., root mean square (RMS) height, correlation length, and autocorrelation function). These surface roughness measurements are then used as inputs for surface dynamics modeling, e.g., for soil erosion modeling...

This paper presents a collective sensing approach that integrates imperfect Volunteered Geographic Information (VGI) obtained through Citizen Science (CS) tree mapping projects with very high resolution (VHR) optical remotely sensed data for low-cost, fine-scale, and accurate mapping of trees in urban orchards. To this end, an individual tree crown...

アジア太平洋地域の発展途上国で進んでいる森林減少の最大の要因は、違法かつ持続可能でない伐採である。違法伐採によって木材輸入国が安価な木材を大量に輸入できる一方で、輸出国の自然環境、森林の管理・経営（ガバナンス）、そして森林に依存して暮らしている人々の生活が犠牲になっている。木材輸入国においても発展途上国の適正な森林管理を促進する義務があることを認識して、現在多くの政府が合法で持続可能な木材の調達を支援する公共調達政策を導入している。これは、持続可能な開発を進める上で国際貿易を活用する極めて重要な一歩である。 本ポリシー・ブリーフは、日本、英国、オランダ及びフランスで実施されている木材公共調達政策を比較し、各国の手法の共通点と相違点を検証しながら...

This policy brief includes a comparative analysis between Japan's public timber procurement policy and those of several European countries. In addition to identifying a set of elements that public timber procurement policies must include to favour legal and sustainable timber, it provides recommendations for further strengthening Japan's policy on...

This report presents the results of IGES research on public timber procurement policy to date. It includes a comparative analysis between Japan’s policy and those of several European countries. In addition to providing recommendations for further strengthening Japan’s policy, the report identifies a generic set of elements that public timber...

木材の公共調達政策に関する研究成果をまとめた本書では、日欧における政策の比較分析を行い、日本が合法性や持続可能性を満たした木材の調達を優先させるための提言に加え、効果的な調達政策が兼ね備えるべき要素を包括的に示している。 Remarks: English version is available at: http://pub.iges.or.jp/modules/envirolib/view.php?docid=983 If you wish to receive a hardcopy of the report, please contact [email protected].