File:G-F triangulation.jpg
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G-F_triangulation.jpg （272 × 400像素，文件大小：21 KB，MIME类型：image/jpeg）
摘要
| 描述 | Gemma Frisius's 1533 diagram introducing the idea of triangulation into the science of surveying. Having established a baseline, eg the cities of Brussels and Antwerp, the location of other cities, eg Middelburg, can be found by taking its compass direction at each end of the baseline, and plotting where the two directions cross. Note that this was only a theoretical presentation of the concept -- because of hills etc, it is in fact actually impossible to see Middelburg from either Brussels or Antwerp! Nevertheless, the figure soon became well known all across Europe. |
| 日期 | |
| 来源 | Libellus de locorum describendorum ratione. This scan found at [1] |
| 作者 | Gemma Frisius |
![[1]](http://www.math.yorku.ca/SCS/Gallery/images/G-F_triangulation.jpg){kind=link}
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2008年4月30日 (三) 17:46 | | 272 × 400（21 KB） | wikimediacommons>Jheald | {{Information |Description=en:Gemma Frisius's 1533 diagram introducing the idea of en:triangulation into the science of surveying. Having established a baseline, eg the cities of Brussels and Antwerp, the location of other cities, eg Middelberg |
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