PAC_CLC: Calculated seabed data for the continental margin of the U.S. Pacific Coast (California, Oregon, Washington) from usSEABED (pac_clc.txt)

This data layer (PAC_CLC.txt) is one of five point coverages of known sediment samples, inspections, and probes from the usSEABED data collection for the U.S Pacific continental margin integrated using the software system dbSEABED. This data layer represents the calculated (CLC) output of the dbSEABED mining software. Data in this file extend variables determined through the data extraction (EXT) and data parsing (PRS) processes of dbSEABED, calculated using empirical relations or known functions. The CLC data is the most derivative and least accurate of the usSEABED data files and should be used with caution; however, many users may appreciate that it extends the coverage of map areas with attributes, especially physical properties attributes. Please refer to the dbSEABED page (http://pubs.usgs.gov/ds/2006/182/dbseabed.html), and the Frequently Asked Questions (http://pubs.usgs.gov/ds/2006/182/faq.html) pages for more information on the calculation process. This file contains the same data fields as the extracted (PAC_EXT) and parsed (PAC_PRS) data files, and the three files may be combined.此数据图层（PAC_CLC.txt）为美国太平洋大陆边缘usSEABED数据集中的5个点位覆盖图层之一，该数据集涵盖已知沉积物样本、勘查结果与探测数据，依托dbSEABED软件系统整合完成。此数据图层代表dbSEABED采矿软件的计算型（CLC）输出结果。本文件中的数据拓展了通过dbSEABED的数据提取（EXT）与数据解析（PRS）流程所确定的变量集，这些变量通过经验关系式或已知函数计算得到。在usSEABED的全部数据文件中，CLC类数据的衍生层级最高且精度最低，使用时需谨慎；不过，该数据集可为地图区域补充属性信息（尤其是物理属性信息），这一特性可为众多用户所青睐。如需了解更多关于该计算流程的细节，请参阅dbSEABED官方页面（http://pubs.usgs.gov/ds/2006/182/dbseabed.html）与常见问题解答页面（http://pubs.usgs.gov/ds/2006/182/faq.html）。本文件与提取型（PAC_EXT）及解析型（PAC_PRS）数据文件的数据字段完全一致，三者可合并使用。