PLSS County Boundaries

LANDSURVEY_COUNTY_POLY_IN is a 1:24,000-scale polygon shapefile, originally with a projection of Universal Transverse Mercator (UTM) North American Datum (NAD) 1983 zone 16. After republishing this shapefile by the IGIO, this data is with a projection of WGS84. This shapefile was derived from a predecessor coverage named "IN_LANDSURVEY." IN_LANDSURVEY is a digital representation of land survey features as represented on the USGS 1:24,000 digital raster graphic (DRG) series. ESRI ArcEdit 8.1 and ESRI ArcView 3.2 were used to extract the following shapefiles from IN_LANDSURVEY: LANDSURVEY_COUNTY_LINE_IN, LANDSURVEY_COUNTY_POLY_IN, LANDSURVEY_SECTIONS_LINE_IN, LANDSURVEY_SECTIONS_POLY_IN, LANDSURVEY_STATE_LINE_IN, LANDSURVEY_STATE_POLY_IN, LANDSURVEY_TOWNSHIPS_LINE_IN, and LANDSURVEY_TOWNSHIPS_POLY_IN.`LANDSURVEY_COUNTY_POLY_IN` 是比例尺为1:24000的多边形形状文件（shapefile），初始投影为通用横轴墨卡托（Universal Transverse Mercator, UTM）北美大地基准1983（North American Datum, NAD）1983第16带。经IGIO重新发布该形状文件后，其投影已转换为WGS84。该形状文件源自名为“IN_LANDSURVEY”的前驱覆盖数据集。`IN_LANDSURVEY` 是对美国地质调查局（United States Geological Survey, USGS）1:24000数字栅格图（Digital Raster Graphic, DRG）系列中所呈现的土地测量要素的数字化表达。研究人员使用ESRI ArcEdit 8.1与ESRI ArcView 3.2，从`IN_LANDSURVEY`中提取得到以下形状文件：`LANDSURVEY_COUNTY_LINE_IN`、`LANDSURVEY_COUNTY_POLY_IN`、`LANDSURVEY_SECTIONS_LINE_IN`、`LANDSURVEY_SECTIONS_POLY_IN`、`LANDSURVEY_STATE_LINE_IN`、`LANDSURVEY_STATE_POLY_IN`、`LANDSURVEY_TOWNSHIPS_LINE_IN` 以及 `LANDSURVEY_TOWNSHIPS_POLY_IN`。