High Resolution Layer: Imperviousness Density 2006 (raster 100m) accounting layer, Jan. 2019

The current resource was derived from original Copernicus High Resolution Layer Imperviousness Density 2006 product for the purposes of imperviousness indicator (LSI002) calculations within the EEA LEAC CUBE environment. The dataset is also input to the imperviousness indicator itself.

The high resolution imperviousness products capture the percentage and change of soil sealing. Built-up areas are characterized by the substitution of the original (semi-) natural land cover or water surface with an artificial, often impervious cover. These artificial surfaces are usually maintained over long periods of time. A series of high resolution imperviousness datasets (for the 2006, 2009, 2012 and 2015 reference years) with all artificially sealed areas was produced using automatic derivation based on calibrated Normalized Difference Vegetation Index (NDVI).
This series of imperviousness layers constitutes the main status layers. They are per-pixel estimates of impermeable cover of soil (soil sealing) and are mapped as the degree of imperviousness (0-100%). Imperviousness change layers were produced as a difference between the reference years (2006-2009, 2009-2012, 2012-2015 and additionally 2006-2012, to fully match the CORINE Land Cover production cycle) and are presented 1) as degree of imperviousness change (100% - +100%), in 20m and 100m pixel size, and 2) a classified (categorical) 20m change product. The latest version (published: 15/01/2019) of 100m resolution imperviousness status layers represents a time series consistent with 100m resolution imperviousness change layers - the cell by cell difference of the degree of imperviousness status corresponds to the degree of imperviousness change. The production of the High Resolution Imperviousness products was coordinated by the European Environment Agency in the frame of the EU Copernicus programme.

本数据集源自原始的2006年哥白尼高分辨率层不透水面密度产品，用于在欧洲环境署（European Environment Agency, EEA）LEAC CUBE环境中开展不透水面指标（LSI002）的计算工作，同时本数据集也作为该不透水面指标的输入数据。

高分辨率不透水面产品可反映土壤密封的占比与变化情况。建成区的典型特征为：原有的（半）自然土地覆被或水面被人工覆被（通常为不透水覆被）所替代，这类人工地表通常会长期留存。本系列高分辨率不透水面数据集覆盖2006、2009、2012及2015四个参考年份的全部人工密封区域，基于校正后的归一化差异植被指数（Normalized Difference Vegetation Index, NDVI）通过自动提取方式生成。

该系列不透水面图层构成了核心状态图层，为逐像素估算的土壤不透水覆被程度（即土壤密封程度），并以不透水面占比（0-100%）进行制图。不透水面变化图层由不同参考年份的状态图层差值生成，涵盖2006-2009、2009-2012、2012-2015三组时段，另补充2006-2012时段以完全匹配CORINE土地覆被产品的生产周期。变化图层以两种形式呈现：1）以不透水面变化幅度（-100% ~ +100%）表示，像素分辨率包含20m和100m；2）分类（类别型）20m变化产品。最新版本（发布日期：2019年1月15日）的100m分辨率不透水面状态图层，构建了与100m分辨率不透水面变化图层一致的时间序列——状态图层的逐像素不透水面占比差值，与变化图层的不透水面变化幅度一一对应。本系列高分辨率不透水面产品由欧洲环境署在欧盟哥白尼计划框架下协调生产。