Application of High-resolution Satellite Imagery to the Study of Tropical Infectious Diseases in Africa

高分辨率卫星图像在非洲热带传染病研究中的应用

基本信息

批准号：
14406016
负责人：
ATAKA Yuji
金额：
$ 3.71万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

This study evaluated potentials of high-resolution satellite imagery applied to the study of tropical infectious diseases. The prevalence of Schistosoma haematobium infection in Bandamaji, Zanzibar, was 50.3% (males:62.6%, females:39.4%), and egg-positive rates decreased with increasing age groups, with its peak at 70.7% (males:83.3%, females:58.2) for the 6-18 age group. High mean score for the knowledge of schistosomiasis etiology implied that the villagers understood considerably about the infection risk of the river/pond water. The questionnaire and direct observation on water exposures also clearly indicated that the villagers contacted risk water frequently in spite of their awareness of infection risk. "Washing utensils/tools/bicycle" and "fishing" were significant factors related to infection for males and "washing clothes" for females. These results corresponded with the percentage and intensity of egg positives, and with villagers' answers to the questionnaire.We concluded th … More at the applicability of high-resolution satellite imagery were as follows ; (1)the combination of supervised classification and NDVI values detected water exposure sites with reasonable accuracy. (2)Pan-sharpened QuickBird multi-spectral image is useful in discriminating the land cover, and in collecting information, e.g. estimation of population size. (3)It allows villagers' behaviors to be associated with the location of exposure sites on the image, and to be analyzed by the actual distance, not by the slant distance. (4)It is possible to replace detailed maps for most purposes, and to estimate possible flood area through the use of DEM. However, (5)obtaining high-resolution satellite imagery may take long, possibly more than a year, for the tropical region in particular. This implies that the failure of obtention would be crucial for the prospective epidemiological study in the field. The high-resolution satellite imagery is useful especially during initial phase of field research in the unknown area, unless the acquisition of image take time. Less

这项研究评估了应用于热带感染研究的高分辨率卫星图像的潜力。桑给巴尔Bandamaji的血吸虫感染的患病率为50.3％（男性：62.6％：62.6％，女性：39.4％），卵阳性率随着年龄的增长而降低，其峰值为70.7％（男性：83.3％，女性：58.3.3％，女性：58.2岁）。血吸虫病病因学知识的高平均得分暗示，可以理解的是，村民可以理解河流/池塘水的感染风险。问卷和对水暴露的直接观察也清楚地表明，尽管人们对感染风险的意识，村民经常接触风险水。 “洗手器物/工具/自行车”和“钓鱼”是与男性感染和女性“洗衣服”有关的重要因素。这些结果与鸡蛋阳性的百分比和强度相对应，以及村民对问卷的回答。我们得出的结论是……高分辨率卫星图像的适用性如下；（1）具有合理准确性的监督分类和NDVI值的结合。（2）泛使用的Quickbird多光谱图像可用于区分土地覆盖，并在收集信息中，例如估计人口规模。（3）它允许村民的行为与图像上的曝光地点的位置相关联，并通过实际距离进行分析，而不是通过倾斜距离进行分析。（4）出于大多数目的，可以替换详细的地图，并通过使用DEM估算可能的洪水区域。但是，（5）特别是对于热带地区而言，获得高分辨率卫星图像可能需要很长时间，可能需要一年多。这意味着观察失败对于该领域的前瞻性流行病学研究至关重要。高分辨率卫星图像很有用，尤其是在未知区域的现场研究初始阶段，除非获得图像需要时间。较少的