BASE Temperature Data Record (TDR) from the SSM/I and SSMIS Sensors, CSU Version 1

The BASE Temperature Data Record (TDR) dataset from Colorado State University (CSU) is a collection of the raw unprocessed antenna temperature data that has been written into single orbit granules and reformatted into netCDF-4. The temperature data are from the Special Sensor Microwave Imager (SSM/I) and Special Sensor Microwave Imager Sounder (SSMIS) series of passive microwave radiometers carried onboard the Defense Meteorological Satellite Program (DMSP) satellites. This dataset encompasses data from a total of nine satellites including the SSM/I sensors on board DMSP satellites F08, F10, F11, F13, F14, and F15 as well as the SSMIS sensors on board DMSP satellites F16, F17, and F18. The data record covers the time period from July 1987 through the present with a 7 to 10 day latency. The spatial and temporal resolutions of the BASE files correspond to the original resolution of the raw source TDR observations. There are roughly 15 orbits per day with a swath width of approximately 1400 km resulting in nearly global daily coverage. The spatial resolution of the data is a function of the sensor/channel and varies from approximately ~50 km for the lowest frequency channels to ~15km for the high-frequency channels. These files contain all of the information from the original source TDR files with the following changes/additions. The BASE files have been reorganized into single orbit granules with duplicate scans removed, and spacecraft position and velocity based on the TLE (two line element) data have been added for calculating geolocation. With the exception of duplicate scans, none of data from the original TDR files was changed or removed. This BASE TDR dataset is used by CSU as input for the subsequent processing of the final intercalibrated Fundamental Climate Data Record (FCDR). The file format is netCDF-4 with added metadata that follow the Climate and Forecast (CF) Conventions and Attribute Convention for Dataset Discovery (ACDD).

科罗拉多州立大学（Colorado State University, CSU）的BASE温度数据记录（Temperature Data Record, TDR）数据集，是一组经整理的原始未处理天线温度数据集合。这些数据被封装为单轨道数据块，并重新格式化为netCDF-4格式。该温度数据来源于搭载于国防气象卫星计划（Defense Meteorological Satellite Program, DMSP）卫星的专用传感器微波成像仪（Special Sensor Microwave Imager, SSM/I）与专用传感器微波成像仪/探空仪（Special Sensor Microwave Imager Sounder, SSMIS）系列无源微波辐射计。本数据集涵盖总计9颗卫星的观测数据：包括搭载于DMSP卫星F08、F10、F11、F13、F14及F15的SSM/I传感器数据，以及搭载于DMSP卫星F16、F17及F18的SSMIS传感器数据。该数据记录的时间跨度为1987年7月至今，数据发布延迟为7至10天。BASE文件的时空分辨率与原始TDR观测数据的原生分辨率完全一致。每日约产生15个轨道数据块，单幅幅宽约1400千米，可实现近乎全球的每日覆盖。数据的空间分辨率取决于传感器与通道类型：最低频率通道的空间分辨率约为50千米，高频通道则约为15千米。该数据集文件保留了原始TDR文件的全部信息，仅进行了以下调整与补充：将数据重组为单轨道数据块并移除重复扫描帧；基于两行轨道要素（Two Line Element, TLE）数据添加航天器位置与速度信息，用于地理定位计算。除重复扫描帧外，原始TDR文件中的所有数据均未被修改或删除。该BASE TDR数据集被科罗拉多州立大学用作后续处理最终经过交叉校准的基础气候数据记录（Fundamental Climate Data Record, FCDR）的输入数据源。文件格式为netCDF-4，并添加了遵循《气候与预报（Climate and Forecast, CF）约定》与《数据集发现属性约定（Attribute Convention for Dataset Discovery, ACDD）》标准的元数据。