9-second gridded continental Australia revegetation benefit (cleared natural areas) for Amphibians 1990:2050 MIROC5 RCP 8.5 (CMIP5) (GDM: AMP_r2_PTS1)

Benefits of revegetation index for Amphibians as a function of land clearing within the present long term (30 year average) climate (1990 centred) based on Generalised Dissimilarity Modelling (GDM) of compositional turnover.
This metric represents the marginal benefit from a unit increase of vegetation at the site, which is a direct function of the slope of the species area curve at the test state of the site. In practice, revegetation of the whole cell is likely to be impractical due to the availability of cleared land within the cell, and practical limitations such as land ownership and revegetation cost. The metric therefore excludes these factors from the analysis, allowing direct comparison of the relative benefit of a given area of revegetation between cells. The values of the index generated according to the above formula are generally low (since a significant area is required to support additional species) and the index is rescaled by multiplying by 1000 to bring it into an approximate 0-1 range.
This metric was developed along with others for use in an assessment of the efficacy of the protected area system for biodiversity under climate change at continental and global scales, presented at the IUCN World Parks Congress 2014. It is described in the AdaptNRM Guide “Helping Biodiversity Adapt: Supporting climate adaptation planning using a community-level modelling approach”, available online at: www.adaptnrm.org.
Data are provided in two forms:
1. Zipped ESRI float grids: Binary float grids (*.flt) with associated ESRI header files (*.hdr) and projection files (*.prj). After extracting from the zip archive, these files can be imported into most GIS software packages, and can be used as other binary file formats by substituting the appropriate header file.
2. ArcGIS layer package (*.lpk): These packages contain can be unpacked by ArcGIS as a raster with associated legend.
Additionally a short methods summary is provided in the file BiodiversityModellingMethodsSummary.pdf for further information.
Layers in this 9s series use a consistent naming convention:
BIOLOGICAL GROUP _ FROM BASE_ TO SCENARIO_ ANALYSIS
e.g. A_90_CAN85_S or R_90_MIR85_L
where BIOLOGICAL GROUP is A: amphibians, M: mammals, R: reptiles and V: vascular plants

基于物种组成周转的广义非相似性模型（Generalised Dissimilarity Modelling, GDM），本研究分析了以1990年为中心的长期（30年平均）气候背景下，土地清理对两栖动物植被恢复指数的效益影响。
该指标表征了样地植被每增加1单位所带来的边际效益，其直接取决于样地测试状态下的物种-面积曲线斜率。实际应用中，由于样地内已清理土地的可获取性、土地所有权及植被恢复成本等现实限制，对整个网格单元开展全面植被恢复往往不具备可行性。因此，本指标未纳入上述因素，可实现不同网格单元间特定面积植被恢复的相对效益直接对比。按上述公式生成的指数数值普遍偏低（因支撑新增物种需要较大面积的植被），故通过乘以1000对指数进行重新标度，使其大致处于0-1区间内。
该指标与其他指标一同被开发，用于评估气候变化背景下大陆及全球尺度保护区系统的生物多样性保护效能，相关成果已在2014年国际自然保护联盟（International Union for Conservation of Nature, IUCN）世界公园大会上展示。其详细说明见于《AdaptNRM指南：助力生物多样性适应：基于群落级建模方法支撑气候适应规划》，可通过在线链接www.adaptnrm.org获取。
本数据集提供两种格式的数据：
1. 压缩的ESRI浮点栅格文件：包含二进制浮点栅格（*.flt）、配套的ESRI头文件（*.hdr）及投影文件（*.prj）。从压缩包解压后，这些文件可导入绝大多数地理信息系统（Geographic Information System, GIS）软件，通过替换对应头文件的方式，亦可作为其他二进制文件格式使用。
2. ArcGIS图层包（*.lpk）：该类文件可由ArcGIS解压为带配套图例的栅格图层。
此外，数据集附带《BiodiversityModellingMethodsSummary.pdf》文件，其中提供了简要的方法学概述以供进一步参考。
本9秒分辨率系列栅格图层采用统一命名规范：
BIOLOGICAL_GROUP _ FROM_BASE _ TO_SCENARIO _ ANALYSIS
示例：A_90_CAN85_S 或 R_90_MIR85_L
其中，生物类群（BIOLOGICAL GROUP）的对应缩写为：A=两栖动物（amphibians）、M=哺乳动物（mammals）、R=爬行动物（reptiles）、V=维管植物（vascular plants）