Unique values of OBSMETHOD
Value | Number of Occurrences |
---|---|
synthesis from multiple sources | 50495 |
indirect method (inferred from regional-scale map) | 33454 |
remotely sensed data | 7120 |
digital conversion from published source | 4310 |
direct observation | 2246 |
outcrop observation | 756 |
synthesis of multiple published descriptions | 617 |
indirect method | 82 |