Lower Kittanning 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. E, Appendix 2, Disc 1, and used in this study of the Lower Kittanning 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. E, Appendix 3, Disc 1 (please see it for more detailed information on this geochemical dataset). This subset of the geochemical data for the Lower Kittanning 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. E, Appendix 4, 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.

按经纬度定位的本数据集为下基坦宁煤层（Lower Kittanning coal bed）本研究中所用地球化学数据集的子集，该地球化学数据集收录于E章附录2光盘1。该数据集汇编自美国地质调查局（U.S. Geological Survey, USGS）国家煤炭资源数据系统（National Coal Resources Data System, NCRDS）USCHEM（美国地球化学数据集，U.S. geoCHEMical）、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）与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E章附录3光盘1，如需了解该地球化学数据集的更多详细信息，请查阅该元数据文件。本下基坦宁煤层地球化学数据子集包含本数据集收录的各条记录的灰分产率、硫含量、二氧化硫（SO2）值、总热值、砷含量与汞含量，以及上述参数的数值分级规则，该规则将在本元数据文件的「属性」章节中详述。分析技术细节收录于E章附录4光盘1的参考文献中。由于多数参数的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。以下为可能出现的限定符取值列表：L代表小于（less than），G代表大于（greater than），N代表未检出（not detected），H代表无法轻易解析的干扰。本数据库中未必包含全部上述编码。