摘要
详细阐述了应用全国1km土地利用/覆盖25层分层栅格数据合并生成单层土地利用/覆盖图的方法。通过对初始合成结果的归类、合并和空间平滑,有效减少了图像上像元分布零散的情况,突出了土地利用的空间总体分布格局。具体应用表明,这种处理方法得到的土地利用/覆盖图能够满足水文、地学分析的要求。
As one of the most detailed LULC digital maps now available to public, China 1km grid multi-layer LULC digital map has been published in a format containing 25 layers, in which every layer represents a specific area percentage of a certain LULC category in each grid (1 km×1 km) area of the whole territory of China. Such kind of digital map is very useful in rapid investigation of national land resource and environmental component distribution, but may not be practical in distributed hydrological modeling studies. For the purpose of overcoming this knotty problem, an improved method is proposed in this paper, which takes the best use of the original LULC information from China 1km grid multi-layer LULC digital map but makes some modifications to meet the needs of hydrological studies in practice. A single layer gridded LULC digital map is thus generated based on the principle of area-dominant and spatial smoothing techniques in which main LULC classes are well kept and most of the spatial distribution attributes are enhanced. As an example, the map generated for Yingluoxia basin of Heihe area is discussed on the basis of its application to a distributed hydrological simulation. The result demonstrates its practicality in meeting the needs of hydrological modeling purposes.
出处
《国土资源遥感》
CSCD
2004年第2期32-34,38,i003,共5页
Remote Sensing for Land & Resources
基金
国家重点基础研究发展规划项目(2001CB309404)
海外青年学者合作研究基金(40128001)
教育部科学技术重点项目(2001)。
