Montgomery County Contours

An elevation or topographic contour is a line that connects a series of points of equal elevation and is used to illustrate topography, or relief, on a map. It shows the height of ground above Mean Sea Level (M.S.L.). Numerous contour lines that are close together indicate hilly or mountainous terrain; when far apart, they represent a gentler slope. This layer consists of contours at a five foot interval for Montgomery County. Data was derived from DVRPC and was generated from an aerial topographic survey in 2005.The Delaware Valley Regional Planning Commission's (DVRPC) 9-county region is made up of the following: Bucks, Chester, Delaware, Montgomery, and Philadelphia counties in Pennsylvania; and Burlington, Camden, Gloucester, and Mercer counties in New Jersey. The regional dataset can be be accessed via rest service or downloaded from PASDA地形等高线（topographic contour）是连接一系列海拔相等点的线条，用于在地图上展现地形与地表起伏。它标示了地面相对于平均海平面（Mean Sea Level，M.S.L.）的高度。多条间距较近的等高线代表丘陵或山地地形；而间距较远的等高线则表示坡度较为平缓。本数据集为蒙哥马利县（Montgomery County）采用5英尺间隔生成的等高线图层，数据源自德拉瓦河谷规划委员会（Delaware Valley Regional Planning Commission，简称DVRPC），并基于2005年航空地形测量数据生成。德拉瓦河谷规划委员会（DVRPC）所辖9县区域包括宾夕法尼亚州的巴克斯县、切斯特县、特拉华县、蒙哥马利县与费城县，以及新泽西州的伯灵顿县、卡姆登县、格洛斯特县与默瑟县。该区域数据集可通过REST服务访问，或从宾夕法尼亚空间数据档案馆（Pennsylvania Spatial Data Access，简称PASDA）下载。