Upper Freeport Coal Bed Point Data (Chemistry) in Pennsylvania, Ohio, West Virginia, and Maryland

This dataset (located by latitude and longitude) is a subset of the
geochemical dataset found in Chap. D, Appendix 8, Disc 1, and used
in this study of the Upper Freeport coal bed. That dataset is a
compilation of data from the U.S. Geological Survey's (USGS) National
Coal Resources Data System (NCRDS) USCHEM (U.S. geoCHEMical), The
Pennsylvania State University (PSU), the West Virginia Economic and
Geological Survey (WVGES), and the Ohio Division of Geological Survey
(OHGS) coal quality databases as well as published U.S. Bureau of Mines
(USBM) data. The metadata file for the complete dataset is found in
Chap. D, Appendix 9, Disc 1 (please see it for more detailed
information on this geochemical dataset). This subset of the geochemical
data for the Upper Freeport coal bed includes ash yield, sulfur content,
SO2 value, gross calorific value, arsenic content and mercury content
for these records, as well as the ranking of these values, which is
described later under the attributes in this metadata file. Analytical
techniques are described in the references in Chap. D, Appendix 10,
Disc 1. The analytical data are stored as text fields because many of
the parameters contain letter qualifiers appearing after the numerical
data values. The following is a list of the possible qualifier values:
L - less than, G - greater than, N - not detected, or H - interference
that cannot be easily resolved. Not all of these codes may be in this
database.

本数据集经经纬度定位，是第D章附录8光盘1中收录的地球化学数据集的子集，被用于本项对上弗里波特（Upper Freeport）煤层的研究中。该完整数据集整合了以下来源的数据：美国地质调查局（U.S. Geological Survey, USGS）国家煤炭资源数据系统（National Coal Resources Data System, NCRDS）USCHEM（美国地球化学数据库）、宾夕法尼亚州立大学（Pennsylvania State University, PSU）、西弗吉尼亚州经济与地质调查局（West Virginia Economic and Geological Survey, WVGES）、俄亥俄州地质调查局分局（Ohio Division of Geological Survey, OHGS）的煤炭质量数据库，以及已发表的美国矿业局（U.S. Bureau of Mines, USBM）数据。完整数据集的元数据文件收录于第D章附录9光盘1中，如需了解该地球化学数据集的详细信息，请查阅该文件。本项上弗里波特煤层地球化学数据子集包含本次记录的灰分产率、硫含量、二氧化硫（SO₂）值、总热值、砷含量与汞含量，以及各指标的数值排序，相关说明将在本元数据文件的“属性”章节后续部分展开。分析技术的相关说明收录于第D章附录10光盘1的参考文献中。由于多数参数在数值后带有字母限定符，本次分析数据以文本字段形式存储。以下为可用的限定符取值列表：L代表小于（less than）、G代表大于（greater than）、N代表未检出（not detected）、H代表存在难以轻易解决的干扰。本数据库并非必然包含全部上述编码。