Accuracy Assessment of Canadian Digital Elevation Data using ICESat
Accuracy Assessment of Canadian Digital Elevation Data using ICESat
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DOI：
10.14358/pers.75.1.81
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发表时间：
2009
影响因子：
1.3
通讯作者：
A. Beaulieu;D. Clavet
中科院分区：
文献类型：
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作者：
A. Beaulieu;D. Clavet
过去生成的加拿大数字高程数据 (CDED) 的准确性取决于创建数据源的准确性（从等高线或省级数据交换中提取的高程）。没有办法表征绝对垂直精度，特别是在偏远地区。目前，加拿大自然资源部地形信息中心在加拿大航天局的支持下正在北部进行新的 CDED 制作。大约 1,500 个新数据集正在生成中。高度测量数据部分是通过欧洲遥感卫星 (ERS) 通过干涉测量获得的（70%），部分是通过航空摄影的立体编译获得的（30%）。需要评估 CDED 本身的绝对测高精度，而不是源的绝对测高精度。 ICESAT激光雷达数据给了我们这样的机会。使用 ERS 干涉测量法生成的第一个 CDED 数据集获得的结果非常有希望。一组 21 个 CDED 的精度约为 0.34 m – 6.22 m，即 90% 置信水平时为 10 m。准确性记录在每个数据集的元数据中，并且可以在 GEOBASE 门户 (http://www.geobase.ca/) 上免费获取。
The accuracy of the Canadian Digital Elevation Data (CDED) produced over the past was based on the accuracy of the sources used for their creation (elevation extracted form contour lines or provincial data exchange). No means to characterize the absolute vertical precision was available, particularly in remote areas. A new production of CDED in the North is currently carried out by the Centre for Topographic Information, Natural Resources Canada with the support of the Canadian Space Agency. Approximately 1,500 new data sets are being produced. Altimetric data is partly acquired with the European Remote Sensing satellite (ERS) by interferometry (70 percent) and partly by stereo-compilation with aerial photography (30 percent). The assessment of the absolute altimetric accuracy of the CDEDs themselves as opposed from the sources is required. ICESAT lidar data gives us such an opportunity. The results obtained on the first CDED data sets produced with ERS interferometry are very promising. Accuracy for a group of 21 CDED is in the order of 0.34 m 6.22 m, i.e., 10 m at 90 percent confidence level. Accuracy is recorded in the metadata of each data set and is freely available on the GEOBASE portal (http://www.geobase.ca/).