CRBCZO -- Stream Water Chemistry, Stream Suspended Sediment, Stream Water Temperatures, Groundwater Depth -- USGS -- Christina River Basin -- (1985-2007)

The United States Geological Survey has collected continuous instantaneous time-series data, with intervals commonly ranging from 5-60 minutes. Historically, these instantaneous data have been processed into various daily values, such as the daily maximum, minimum and/or mean. This was done primarily to provide concise values for publication in paper reports. In more recent years, and particularly since the USGS began making real-time instantaneous data available on NWISWeb in 1994, more attention has been given to historical instantaneous data and USGS offices have received increasing requests for these data. Some challenges with meeting those requests are:

Most historical instantaneous data are paper based and were never stored on a computer or were deleted from computers after the computation of the daily values in order to save computer storage space. In most cases this data still exists as original field records, but it is a significant effort to create digital data from the paper-based records.

Instantaneous data have not historically received the same level of quality control as the official published daily values. For example, periods of fouling may affect the calculation of daily values for a water-quality parameter. In these situations, daily values are typically not published but erroneous instantaneous data remain in the database.

For more info on accuracy codes etc, see comments/README

Date Range Comments: 30 min to 1 hour intervals

美国地质调查局收集了连续的瞬时时间序列数据，其间隔通常在5至60分钟之间。历史上，这些瞬时数据被加工成各种每日值，如每日最大值、最小值和/或平均值。这一过程主要为了在纸质报告中提供简洁的数值。近年来，尤其是自1994年美国地质调查局开始在NWISWeb上提供实时瞬时数据以来，历史瞬时数据受到了越来越多的关注，美国地质调查局办公室收到了越来越多的对这些数据的请求。满足这些请求面临一些挑战：

大多数历史瞬时数据基于纸质，从未存储在计算机上，或在计算每日值后被从计算机中删除以节省存储空间。在大多数情况下，这些数据仍以原始现场记录的形式存在，但从纸质记录中创建数字数据是一项艰巨的任务。

瞬时数据在历史上并未受到与官方发布的每日值相同级别的质量控制。例如，污染期可能会影响水质参数每日值的计算。在这些情况下，通常不会发布每日值，但错误的数据仍然保留在数据库中。

有关准确性代码等信息，请参阅注释/README。

日期范围注释：每30分钟至1小时的时间间隔。