Silty clay was obtained from the experimental road (Figure 1), at which locates latitude 44.896407° N, and longitude 126.559129° E, and elevation 207.51m.

网友这个句子，主句部分很好（红色部分），但定语从句（蓝色部分）有问题。

这句话包含两层意思：

主句：黏土取自于试验路。

从句：试验路所处的位置。

网友注意：如果表达某条路所处的位置，要用：the road is located in/at/near/by...

The road is located in north latitude 44.896407° ,126.559129 ° east longitude, and at an altitude of 207.51 m.

网友的句子，at which locates 错在把road 当成地点，导致定语从句缺少主语。本来the road 就是定语从句的主语。

原句改为：

1. 用定语从句翻译：

Silty clay was obtained from the experimental road (Figure 1)，which is located in north latitude 44.896407° ,126.559129 ° east longitude, and at an altitude of 207.51 m.

2. 用过去分词短语翻译：

Silty clay was obtained from the experimental road (Figure 1)，(which is) located in north latitude 44.896407° ,126.559129 ° east longitude, and at an altitude of 207.51 m.