GRSM_GEOLOGY

The Digital Geologic Units of Great Smoky Mountains National Park and Vicinity, Tennessee and North Carolina consists of geologic units mapped as area (polygon) features. The data were completed as a component of the Geologic Resources Evaluation (GRE) program, a National Park Service (NPS) Inventory and Monitoring (I&M) funded program that is administered by the NPS Geologic Resources Division (GRD). The data were captured, grouped and attributed as per the NPS GRE Geology-GIS Geodatabase Data Model v. 1.3.1. (available at: https://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm). The data layer is available as a feature class in a 9.1 personal geodatabase (grsm_geology.mdb). Attributed geologic contact lines that define the geologic unit polygons are present within the Geologic Contacts (GRSMGLGA) data layer. The Geologic Units (GRSMGLG) GIS data layer is also available as a coverage export (.E00) file (GRSMGLG.E00), and as a shapefile (.SHP) file (GRSMGLG.SHP). Each GIS data format has an ArcGIS 9.1 layer (.LYR) file (GRSMGLG_GDB.LYR (geodatabase feature class), GRSMGLG_COV.LYR (coverage), GRSMGLG_SHP.LYR (shapefile) with map symbology that is included with the GIS data. See the Distribution Information section for additional information on data acquisition. The GIS data projection is NAD83, UTM Zone 17N. That data is within the area of interest of Great Smoky Mountains National Park. This dataset is just one component of the Digital Geologic Map of Great Smoky Mountains National Park and Vicinity, Tennessee and North Carolina. The data layers (feature classes) that comprise the Digital Geologic Map of Great Smoky Mountains National Park and Vicinity, Tennessee and North Carolina include: GRSMAML (Alteration and Metamorphic Lines), GRSMATD (Geologic Attitude and Observation Points), GRSMFLD (Folds), GRSMFLT (Faults), GRSMGLG (Geologic Units), GRSMGLGA (Geologic Contacts), GRSMGPT (Point Geologic Features), GRSMGSL (Geologic Sample Localities), GRSMMIN (Mine Point Features), GRSMSEC (Cross Section Lines), GRSMSUR (Surficial Geologic Units), GRSMSURA (Surficial Contacts) and GRSMSYM (Fault Symbology). There are three additional ancillary map components, the Geologic Unit Information (GRSMGLG1) Table, the Source Map Information (GRSMMAP) Table and the Map Help File (GRSM_GEOLOGY.HLP). Refer to the NPS GRE Geology-GIS Geodatabase Data Model v. 1.3.1 (available at: https://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm) for detailed data layer (feature class) and table specifications including attribute field parameters, definitions and domains, and implemented topology rules and relationship classes. The corresponding Integration of Resource Management Applications (IRMA) NPS Data Store reference is Great Smoky Mountains National Park Geology.田纳西州与北卡罗来纳州大烟山国家公园及周边区域数字地质单元数据集，以面（多边形）要素形式映射地质单元。 本数据集作为地质资源评估（Geologic Resources Evaluation, GRE）项目的组成部分完成，该项目由美国国家公园管理局（National Park Service, NPS）清查与监测（Inventory and Monitoring, I&M）计划资助，由NPS地质资源司（Geologic Resources Division, GRD）负责管理。 数据按照NPS GRE地质-GIS地理数据库数据模型v1.3.1进行采集、分组与属性赋值，相关规范可通过以下链接获取：https://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm。 该数据图层以ArcGIS 9.1个人地理数据库（grsm_geology.mdb）中的要素类形式提供。用于界定地质单元多边形的带属性地质界线，存储于地质界线（Geologic Contacts, GRSMGLGA）数据图层中。 地质单元（Geologic Units, GRSMGLG）GIS数据图层同时提供Coverage导出格式（.E00文件，GRSMGLG.E00）以及形状文件（SHP格式，GRSMGLG.SHP）。 每种GIS数据格式均附带ArcGIS 9.1图层文件（.LYR）：对应地理数据库要素类的GRSMGLG_GDB.LYR、对应Coverage的GRSMGLG_COV.LYR以及对应形状文件的GRSMGLG_SHP.LYR，其中包含配套的地图符号系统。 有关数据获取的更多详细信息，请参阅「分发信息」章节。 本GIS数据采用NAD83坐标系下UTM第17北带（UTM Zone 17N）投影，覆盖范围涵盖大烟山国家公园及其研究区域。 本数据集仅为田纳西州与北卡罗来纳州大烟山国家公园及周边区域数字地质图的组成部分之一。 构成田纳西州与北卡罗来纳州大烟山国家公园及周边区域数字地质图的数据图层（要素类）包括：GRSMAML（蚀变与变质界线，Alteration and Metamorphic Lines）、GRSMATD（地质产状与观测点，Geologic Attitude and Observation Points）、GRSMFLD（褶皱，Folds）、GRSMFLT（断层，Faults）、GRSMGLG（地质单元，Geologic Units）、GRSMGLGA（地质界线，Geologic Contacts）、GRSMGPT（点状地质要素，Point Geologic Features）、GRSMGSL（地质采样点，Geologic Sample Localities）、GRSMMIN（矿山点要素，Mine Point Features）、GRSMSEC（剖面线，Cross Section Lines）、GRSMSUR（表层地质单元，Surficial Geologic Units）、GRSMSURA（表层界线，Surficial Contacts）以及GRSMSYM（断层符号，Fault Symbology）。 此外还包含三类辅助地图组件：地质单元信息（GRSMGLG1）表、源地图信息（GRSMMAP）表以及地图帮助文件（GRSM_GEOLOGY.HLP）。 有关数据图层（要素类）与表的详细规范（包括属性字段参数、定义与值域，以及已实现的拓扑规则和关系类），请参阅NPS GRE地质-GIS地理数据库数据模型v1.3.1，相关规范可通过以下链接获取：https://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm。 对应的资源管理应用集成（Integration of Resource Management Applications, IRMA）NPS数据存储引用为「大烟山国家公园地质数据」。