The versions of the Guide Documents referred to here are:
SeaWinds on ADEOS-II Level 3 Daily Gridded Ocean Wind Vectors (JPL SeaWinds Project) Guide Document, v1.2, October 2003Listed below are the major differences with comments in small italics. Sections 7.* contain information on HDF variables (highlighted in bold) and metadata.
SeaWinds on QuikSCAT Level 3 Daily, Gridded Ocean Wind Vectors (JPL SeaWinds Project) Guide Document, v1.1, October 2001
| Section | SeaWinds on ADEOS-II | SeaWinds on QuikSCAT |
|---|---|---|
| Data Set Overview | ascending and descending equator crossings are at local times of 10:30 PM and 10:30 AM | ascending and descending equator crossings are at local times of 6 AM and 6 PM |
| Data Acquisition Methods | Sections 5.1, 5.2, and 5.3 were completely rewritten to reflect ADEOS-II Data Acquisition and Ground System. | |
| Data Description | rep_wind_speed [1440,720,2] replaces both | asc_avg_wind_speed [1440,720] des_avg_wind_speed [1440,720] |
| Data Description | rep_wind_velocity_u [1440,720,2] replaces both | asc_avg_wind_velocity_u [1440,720] des_avg_wind_velocity_u [1440,720] |
| Data Description | rep_wind_velocity_v [1440,720,2] replaces both | asc_avg_wind_velocity_v [1440,720] des_avg_wind_velocity_v [1440,720] |
| Data Description | eliminated both asc_avg_wind_speed_sq des_avg_wind_speed_sq | |
| Data Description | null_data_indicator indicates whether data at a
Level 3 grid cell location is null. This flag is set to 0 if the
Data Exists Flag (bit 0) is set to 0 in grid_cell_quality_flag.
This flag is set to 1 otherwise. A value of 0 indicates that the
data is usable. A value of 1 indicates that the data is null and
should not be used.
The meaning is reversed from asc_wvc_count, des_wvc_count |
asc_wvc_count: distinguishes NULL values from zero value of wind speed in the ascending pass data. If asc_wvc_count is 0 in a given cell, wind retrieval did not take, and wind speed values are NULL in that cell. If asc_wvc_count is 1, wind retrieval occurred, and a 0 value of wind speed indicates a measurement of 0 m/s. |
| Data Description | null_data_indicator [1440,720,2] replaces both | asc_wvc_count [1440,720] des_wvc_count [1440,720] |
| Data Description | rep_time_of_day [1440,720,2] replaces both | asc_time_frac [1440,720] des_time_frac [1440,720] |
| Data Description | rep_rain_prob [1440,720,2] replaces both | asc_rain_prob [1440,720] des_rain_prob [1440,720] |
| Data Description | rain_flag indicates whether rain was detected at a Level 3 grid cell location. This flag is set to 0 if the Rain Flag Usable (bit 3) and the Rain Flag (bit 4) are set to 0 in grid_cell_quality_flag. This flag is set to 1 otherwise | asc_rain_flag: indicates whether or not the rain flag algorithm detected the presence of rain in an ascending pass wind vector cell. |
| Data Description | rain_flag [1440,720,2] replaces both | asc_rain_flag [1440,720] des_rain_flag [1440,720] |
| Data Description | grid_cell_quality_flag is new | |
| Data Description | rep_amsr_rain_indicator is new | |
| Data Description | rep_atten_cor is new | |
| Data Description | rep_srad_rain_rate is new | |
| Data Description | File Naming Convention: SW_XWGRD3_yyyyddd.* | File Naming Convention: QS_XWGRD3_yyyyddd.* |