ground-based | visual observation
| visual observation abbr. | |
| nat.sc. earth.sc. agric. | observation visuelle |
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| gb | |||
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ground-based : 37 phrases in 13 subjects |
| Aviation | 6 |
| Communications | 8 |
| Construction | 1 |
| Environment | 2 |
| General | 4 |
| Information technology | 1 |
| Life sciences | 4 |
| Measuring instruments | 1 |
| Natural sciences | 1 |
| Radio | 2 |
| Remote sensing | 1 |
| Transport | 4 |
| United Nations | 2 |