Land Cover Map 1990 (25m raster, GB)

This dataset consists of the 25m raster version of the Land Cover Map 1990 (LCM1990) for Great Britain. The 25m raster product consists of three bands: Band 1 - raster representation of the majority (dominant) class per polygon for 21 target classes; Band 2 - mean per polygon probability as reported by the Random Forest classifier (see supporting information); Band 3 - percentage of the polygon covered by the majority class. The 21 target classes are based on the Joint Nature Conservation Committee (JNCC) Broad Habitats, which encompass the entire range of UK habitats. This dataset is derived from the vector version of the Land Cover Map, which contains individual parcels of land cover and is the highest available spatial resolution. The 25m raster is the most detailed of the LCM1990 raster products both thematically and spatially, and it is used to derive the 1km products.

LCM1990 is a land cover map of the UK which was produced at the Centre for Ecology & Hydrology by classifying satellite images (mainly from 1989 and 1990) into 21 Broad Habitat-based classes. It is the first in a series of land cover maps for the UK, which also includes maps for 2000, 2007, 2015, 2017, 2018 and 2019.

LCM1990 consists of a range of raster and vector products and users should familiarise themselves with the full range (see related records, the CEH web site and the LCM1990 Dataset documentation) to select the product most suited to their needs.

本数据集包含大不列颠地区1990年土地覆盖图（Land Cover Map 1990, LCM1990）的25米栅格版本。该25米栅格产品包含三个波段：波段1——针对21个目标类别的每个多边形的优势（主导）类栅格表征；波段2——由随机森林分类器（Random Forest classifier，见补充材料）给出的每个多边形的平均概率值；波段3——多边形中优势类所占的百分比。21个目标类别基于联合自然保育委员会（Joint Nature Conservation Committee, JNCC）的宽泛生境分类体系，该体系涵盖了英国所有生境类型。本数据集源自土地覆盖图的矢量版本，该矢量版本包含独立的土地覆盖地块，且拥有当前可获得的最高空间分辨率。该25米栅格产品是LCM1990所有栅格产品中在专题内容与空间分辨率两方面均最为精细的版本，且被用于生成1千米分辨率的产品。

LCM1990是英国的土地覆盖图，由生态与水文中心（Centre for Ecology & Hydrology）通过将卫星影像（主要采集于1989年和1990年）分类为21个基于宽泛生境的类别而生成。它是英国系列土地覆盖图的首版，该系列还包含2000年、2007年、2015年、2017年、2018年及2019年的土地覆盖图。

LCM1990包含多种栅格与矢量产品，用户应全面了解其全部产品类型（详见相关记录、生态与水文中心（CEH）官网及LCM1990数据集文档），以选择最贴合自身需求的产品。

搜集汇总

背景与挑战

背景概述

该数据集是1990年英国土地覆盖图的25米栅格版本，包含三个波段，分别表示主要土地覆盖类别、分类概率和覆盖百分比，基于21个JNCC Broad Habitats类别进行分类。作为英国土地覆盖图系列的首个产品，它源自高分辨率矢量数据，是空间和主题上最详细的栅格产品，用于生成其他低分辨率产品。