|
| Observing Platform | Observation Type | Average Frequency of Data
(varies by individual platform ID and data type) | Temporal/Geographical Coverage
(each dot represents a 3° box containing one or more observations) |
|---|
| Aircraft | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 2 - Temperature/dewpoint depression at variable pressure
- Category 3 - Wind at variable pressure
- Category 4 - Wind at variable height
- Category 5 - Tropopause data
- Category 6 - Aircraft report or satellite estimate
- Category 7 - Cloud cover
- Category 8 - Additional data
| - 1 to 6 per minute
- 1 to 43 per hour
- 1 to 20 per day
- 1 to 6 per week
- 1 to 4 per month
- 2 to 10 per year
| 1972-12-31 to 2007-02-28
 |
| Balloon | Upper Air- Category 6 - Aircraft report or satellite estimate
- Category 8 - Additional data
| - 1 to 17 per day
- 4 to 5 per week
| 1979-01-06 to 1980-01-05
 |
| Bogus | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 8 - Additional data
| - 1 to 2 per day
- 1 to 6 per week
- 1 to 4 per month
- 3 to 10 per year
| 1972-12-20 to 1986-03-11
 |
| Fixed Ship | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 2 - Temperature/dewpoint depression at variable pressure
- Category 3 - Wind at variable pressure
- Category 4 - Wind at variable height
- Category 5 - Tropopause data
- Category 8 - Additional data
| - 1 to 6 per day
- 1 to 6 per week
- 1 to 4 per month
| 1972-12-31 to 1990-04-12
 |
| Land Station | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 2 - Temperature/dewpoint depression at variable pressure
- Category 3 - Wind at variable pressure
- Category 4 - Wind at variable height
- Category 5 - Tropopause data
- Category 7 - Cloud cover
- Category 8 - Additional data
| - 1 per hour
- 1 to 20 per day
- 1 to 6 per week
- 1 to 4 per month
- 9 to 10 per year
| 1972-12-31 to 2007-02-28
 |
| Roving Ship | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 2 - Temperature/dewpoint depression at variable pressure
- Category 3 - Wind at variable pressure
- Category 4 - Wind at variable height
- Category 5 - Tropopause data
- Category 7 - Cloud cover
- Category 8 - Additional data
| - 1 to 17 per day
- 1 to 6 per week
- 1 to 4 per month
| 1972-12-31 to 2007-02-28
 |
| Satellite | Upper Air- Category 1 - Mandatory constant-pressure data
- Category 6 - Aircraft report or satellite estimate
- Category 7 - Cloud cover
- Category 8 - Additional data
| - 1 to 47 per minute
- 1 to 32 per hour
- 1 to 20 per day
- 1 to 6 per week
- 1 to 4 per month
- 4 to 10 per year
| 1972-12-20 to 2007-02-28
 |
