Data for geodiv vignette

Data for the vignette associated with the geodiv R package. Data may be used to analyze patterns in landscape heterogeneity over Oregon, USA. Data included are as follows: (var)_img_450m.tif: texture images (gradient metric applied over moving windows), for the specified metric, applied over a small portion of southwestern Oregon state. The window size used is 450x450m. oregon_elevation_SRTM_2000.tif: Shuttle Radar Topography Mission (SRTM) elevation data covering Oregon state for the year 2000. Data were prepared and downloaded in Google Earth Engine in Fall 2019, and are at 30m resolution. oregon_max_growing_season_EVI_2000_2019.tif: Mean maximum growing season MODIS Enhanced Vegetation Index (EVI) data from 2000-2019. Data were prepared and exported from Google Earth Engine in Fall 2019, and are at 250m resolution. elevation_variables.csv: All gradient surface metrics included in the geodiv R package, calculated for 30km moving windows over Oregon state, using a raster of SRTM elevation (above) aggregated to ~2km resolution. evi_variables.csv: All gradient surface metrics included in the geodiv R package, calculated for 30km moving windows over Oregon state, using a raster of MODIS EVI (above) aggregated to 2km resolution.本数据集为geodiv R包配套的vignette（R包辅助文档）所用数据，可用于分析美国俄勒冈州的景观异质性分布模式。所包含的数据如下： 1. (var)_img_450m.tif：针对指定指标、以450×450米为移动窗口计算得到的纹理影像（应用了梯度度量），覆盖俄勒冈州西南部小范围区域。 2. oregon_elevation_SRTM_2000.tif：Shuttle Radar Topography Mission（SRTM，航天雷达地形测绘任务）2000年俄勒冈州高程数据。该数据于2019年秋季通过Google Earth Engine（谷歌地球引擎）制备并下载，空间分辨率为30米。 3. oregon_max_growing_season_EVI_2000_2019.tif：2000-2019年生长季最大MODIS增强型植被指数（Enhanced Vegetation Index, EVI）均值数据。该数据于2019年秋季通过谷歌地球引擎制备并导出，空间分辨率为250米。 4. elevation_variables.csv：geodiv R包辅助文档中包含的所有梯度表面指标数据集，基于前述SRTM高程栅格（聚合至约2千米分辨率），在俄勒冈州范围内以30千米移动窗口计算得到。 5. evi_variables.csv：geodiv R包辅助文档中包含的所有梯度表面指标数据集，基于前述MODIS EVI栅格（聚合至2千米分辨率），在俄勒冈州范围内以30千米移动窗口计算得到。