Dataset: spatial variables for describing and mapping ecotone forests associated to the Maracá Island region, State of Roraima, northern Brazilian Amazon

The dataset provides information on spatial variables (altitude, slope, drainage distance, Normalized Difference Vegetation Index - NDVI) that are useful for describing and mapping the ecotone forest zones that occur on the Maracá Island and its surroundings, State of Roraima, northern Brazilian Amazon. The study area is ~450,000 ha, with its geographic center located in Maracá Island. The altitude, slope and drainage distance maps are derived from the TOPODATA Project (http://www.dsr.inpe.br/topodata/). The NDVI (Normalized Difference Vegetation Index) map was obtained from Landsat TM5 images: (i) orbit 232: points 57 (03/20/2007) and 58 (03/04/2007) and (ii) orbit 233: points 57 and 58 (11/03/2007). All maps were produced in a raster format with 30 m of spatial resolution and designed for UTM / Zone 20 N, WGS 84, using the ArcGis 10.0 software (http://www.esri.com/software/arcgis/index.html; licensed by Federal University of Roraima - UFRR). The maps were used to extract samples (pixel values) of each variable (altitude, slope, drainage distance, NDVI) from 129 permanent plots (50 mx 10 m; 6.45 ha) dispersed in the six East-West walking trails from the research grid of the Biodiversity Research Program (PPBio) (see Santos et al., 2020 - https://data.mendeley.com/datasets/2j354jtddx/2). The dataset consists of three files: (i) study_site - a figure indicating the location of the study area; (ii) maps - altitude (m), slope (°), drainage distance (m), NDVI (-1: 1); (iii) environmental_variables - altitude (m), slope (°), drainage_distance (m) and NDVI (-1: 1) related to the 129 permanent plots used in the dataset. The current dataset was supported by the projects (i) SavFloRR - Ecologia e manejo dos recursos naturais de ecossistemas de savanas e florestas de Roraima (PPI INPA 015/122), and (ii) Crescimento e mortalidade de árvores em florestas ecotonais de Roraima: efeito das condicionantes ambientais e da variabilidade climática (Proc. CNPq n. 403591 / 2016-3). The Coordination for the Improvement of Higher Education Personnel (CAPES) supported E.H.S. The PELD Program provide a scholarship to W.R.S. (CNPq / CAPES / FAPs / BC-Fundo Newton; Proc. N. 441575 / 2016-1). The National Council for Scientific and Technological Development (CNPq) provided a grant to R.I. Barbosa (CNPq 304204 / 2015-3). The Chico Mendes Institute for Biodiversity Conservation (ICMBio) authorized the study (SISBIO nº 52071).

本数据集提供了有关空间变量（海拔、坡度、排水距离、归一化植被指数——NDVI）的信息，这些变量对于描述和绘制马拉卡岛及其周边地区生态过渡森林区具有重要价值。研究区域面积约为45万公顷，地理中心位于马拉卡岛。海拔、坡度和排水距离地图来源于TOPODATA项目（http://www.dsr.inpe.br/topodata/）。NDVI地图是通过Landsat TM5图像获取的：（i）轨道232：点57（2007年3月20日）和58（2007年3月4日），以及（ii）轨道233：点57和58（2007年11月3日）。所有地图均以30米的空间分辨率以栅格格式制作，适用于UTM / 区20 N，WGS 84，并使用ArcGis 10.0软件（http://www.esri.com/software/arcgis/index.html；由罗赖马联邦大学UFRR授权）。这些地图被用于从129个永久样地（50 mx 10 m；6.45 ha）中提取每个变量（海拔、坡度、排水距离、NDVI）的样本（像素值），这些样地分布在生物多样性研究计划（PPBio）的六条东西向步行小径上（参见Santos等人，2020年——https://data.mendeley.com/datasets/2j354jtddx/2）。数据集包含三个文件：（i）研究区域——指示研究区域位置的图形；（ii）地图——海拔（m）、坡度（°）、排水距离（m）、NDVI（-1：1）；（iii）环境变量——与数据集中使用的129个永久样地相关的海拔（m）、坡度（°）、排水距离（m）和NDVI（-1：1）。当前数据集得到了以下项目支持：（i）SavFloRR——马拉卡生态系统的自然资源生态学与经营管理（PPI INPA 015/122），以及（ii）罗赖马生态过渡森林的树木生长与死亡率：环境条件和气候变化的影响（CNPq n. 403591 / 2016-3）。高等教育人员能力提升协调办公室（CAPES）支持E.H.S.。PELD项目为W.R.S.（CNPq / CAPES / FAPs / BC-Fundo Newton；编号N. 441575 / 2016-1）提供奖学金。国家科学技术发展理事会（CNPq）为R.I. Barbosa（CNPq 304204 / 2015-3）提供了资助。奇科·门德斯生物多样性保护研究所（ICMBio）授权了本研究（SISBIO nº 52071）。