IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| Southern Tibet : vol.4 | |
| 南チベット : vol.4 |
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引用情報
428
SOME REMARKS TO THE HEIGHTS AND DISTANCES.
Length-error. Cross-error.
Plateau-land of Eastern Tibet all directions, summer and
autumn . I.8 t 0.54
N. E. Tibet and Eastern Turkestan , very comfortable
ground, winter . o.2058 o.og
On my journey through Eastern Persia, winter and spring 1906 I had, on a distance of 1,980 km. a length-error of 0.4053, a result which would have become much finer had I not had to cross the Great desert of Kevir twice in rain.
One of the most difficult stretches of ground I ever had to pass was in the Shayok valley, and there the result proves to be miserable. I have accomplished the same route twice in this valley, both times during the cold season, when the river ' was partly frozen, and the road had to cross it on the ice and in the water several times, the rest of the valley being covered with gravel and stones and snow. In April 1902 I got, from the village of Shayok to the entrance of the Murglro-valley a distance of 178 km., and in December 1907 151 km. The two values obtained cannot, however, be compared with one another, as only the second route has been forced into the net of co-ordinates, whilst the first has been left as it was found from my fieldbooks.
The distance between Tankse and the west-end of Lake Panggong, on the other hand, proved to be the same in both cases. I travelled this road the first time in December 1901, and found the distance to be 3 3.6 km., and the second time in August 1906 and found the same distance to be 33.7 km., which was a surprisingly good result.
A very detailed description of the method I have used for arriving at the most accurate results in field-survey which possibly can be obtained, is to be found in Vol. II of my work: Eine Routenaufnahme durch OstJersien, Stockholm . 1922.
iwa
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