X-TRACK, Along track Sea Level Anomalies (2017_02)

X-TRACK, is a regional altimeter products for coastal applications. It has been developed in order to optimize the completeness and the accuracy of the sea surface height information derived from satellite altimetry in coastal ocean areas. 1hz alongtrack SLA are available in 23 regions for different altimetric missions (Topex, Jason-1&2, Geosat, Ers2, Envisat). SLA is computed on a reference track. X-TRACK SLA files hold alongtrack SLA data together with MSSH, FES2012 tide, Dynamic Atmospheric Corrections and distance to coast parameters. Users can both retrieve filtered and non-filtered data.

X-TRACK areas :

+-------------+---------------------------------+
| short name | long name |
+------------+---------------------------------+
| adelie | Adelie-Mertz |
| amazon | Amazon |
| asa | Atlantic South America |
| chinasea | China Sea |
| drake | Drake passage |
| eaustralia | East Australia |
| gom | Gulf of Mexico - Caribbean Sea |
| gulfstream | Gulf Stream |
| hudson | Hudson Bay |
| humboldt | Humboldt current |
| kerguelen | Kerguelen Islands |
| labrador | Labrador Sea |
| medsea | Mediterranean Sea |
| nea | North East Atlantic |
| nindian | North Indian Ocean |
| norway | Norway |
| nwa | North West America |
| nwp | North West Pacific |
| sea | South and East Africa |
| wafrica | West Africa |
| waustralia | West Australia |
| wla | West Latin America - California |
| wtp | West Tropical Pacific |
+------------+---------------------------------+

X-TRACK是一款面向海岸带应用的区域高度计产品。该产品旨在优化从海岸带区域卫星高度计数据中获取的海面高度信息的完整性与准确性。针对不同的高度计任务（Topex、Jason-1&2、Geosat、Ers2、Envisat），23个区域均提供1赫兹沿轨海平面异常（Sea Level Anomaly，SLA）数据。

SLA基于参考轨道计算得出。X-TRACK的SLA文件包含沿轨SLA数据，以及平均海面高度（Mean Sea Surface Height，MSSH）、FES2012潮汐数据、动态大气校正值和离岸距离参数。用户可获取经过滤波和未滤波的数据。

X-TRACK区域：

+------------+---------------------------------+
| 简称 | 全称 |
+------------+---------------------------------+
| adelie | 阿德利-默茨 |
| amazon | 亚马逊 |
| asa | 南美大西洋区域 |
| chinasea | 中国海 |
| drake | 德雷克海峡 |
| eaustralia | 东澳大利亚 |
| gom | 墨西哥湾-加勒比海 |
| gulfstream | 墨西哥湾流 |
| hudson | 哈得逊湾 |
| humboldt | 洪堡洋流 |
| kerguelen | 克尔格伦群岛 |
| labrador | 拉布拉多海 |
| medsea | 地中海 |
| nea | 东北大西洋 |
| nindian | 北印度洋 |
| norway | 挪威 |
| nwa | 北美西北部 |
| nwp | 西北太平洋 |
| sea | 南非与东非 |
| wafrica | 西非 |
| waustralia | 西澳大利亚 |
| wla | 拉丁美洲西部-加利福尼亚 |
| wtp | 热带西太平洋 |
+------------+---------------------------------+