South African Land Cover 1990 Class C Indigenous Forest Resampled to a 1km Grid
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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 4 of the 1990 South African National land cover dataset was used to derive South African land cover 1990 Class C Indigenous Forest 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
由GEOTERRAIMAGE公司2014年发布的商用数据产品——1990年南非全国土地覆盖数据集，基于1989年4月至1993年10月间获取的多季相陆地卫星4/5（Landsat 4/5）数字多光谱影像生成。为覆盖南非全境，共使用76幅影像幅面，每幅幅面平均采用8个不同季相的影像获取日期，累计调用超过600景Landsat影像以解译生成土地覆盖信息。该数据集覆盖南非全域，采用经过地图几何校正的栅格格式存储，栅格单元尺寸为30×30米，与源Landsat 4/5多光谱影像的分辨率保持一致。数据集包含72类土地覆盖/利用信息类别，涵盖丰富的自然与人工地表景观特征。原始土地覆盖数据集采用美国地质调查局（USGS）提供的Landsat 4/5标准地图投影格式，即北通用横轴墨卡托（UTM）/世界大地测量系统1984（WGS84）地图投影进行处理。本产品从1990年南非全国土地覆盖数据集的第4类中提取得到1990年南非C类本土森林土地覆盖数据，并将其重采样至1000×1000米网格分辨率的阿尔伯斯等面积投影（Albers Equal Area），其投影参数为：+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
