South African Land Cover 1990 Class O Bare Resampled to a 1km Grid

The 1990 South African National land cover dataset produced by (© GEOTERRAIMAGE - 2014) as a commercial data product was generated from digital, multi-seasonal Landsat 4/5 multispectral imagery, acquired between April 1989 and October 1993. In excess of 600 Landsat images were used to generate the land cover information, based on an average of 8 different seasonal image acquisition dates, within each of the 76 x image frames required to cover South Africa. The land cover dataset, which covers the whole of South Africa, is presented in a map-corrected, raster format, based on 30x30m cells equivalent to the image resolution of the source Landsat 4/5 multi-spectral imagery. The dataset contains 72 x land cover / use information classes, covering a wide range of natural and man-made landscape characteristics. The original land cover dataset was processed in UTM (north) / WGS84 map projection format based on the Landsat 4/5 standard map projection format as provided by the USGS. Class 40–41 of the 1990 South African National land cover dataset was clustered to derive South African land cover 1990 Class O Bare for the current product and resampled to a 1000 x 1000m grid resolution Albers Equal Area map projection +proj=aea +lat_1=-22 +lat_2=-38 +lat_0=-30 +lon_0=25 +x_0=1400000 +y_0=1300000 +datum=WGS84 +units=m +no_defs

1990年南非国家土地覆盖数据集由（© GEOTERRAIMAGE - 2014）作为商业数据产品制作，其数据来源于1989年4月至1993年10月获取的数字多季节Landsat 4/5多光谱影像。为生成土地覆盖信息，共使用了超过600幅Landsat影像；在覆盖南非所需的76幅影像帧中，每幅均基于平均8个不同季节的影像采集日期。该覆盖南非全境的土地覆盖数据集采用地图校正后的栅格格式呈现，基于30×30米的像元，其分辨率与源Landsat 4/5多光谱影像一致。数据集包含72类土地覆盖/利用信息，涵盖自然与人为景观特征的广泛范围。原始土地覆盖数据集采用UTM（北）/WGS84地图投影格式处理，该格式基于美国地质调查局（USGS）提供的Landsat 4/5标准地图投影格式。1990年南非国家土地覆盖数据集的40–41类经过聚类，衍生出当前产品中的‘1990年南非土地覆盖O类：裸地’，并被重采样至1000×1000米网格分辨率，采用阿尔伯斯等积投影（+proj=aea +lat_1=-22 +lat_2=-38 +lat_0=-30 +lon_0=25 +x_0=1400000 +y_0=1300000 +datum=WGS84 +units=m +no_defs）。