ORWA98_750UTM: Oregon/Washington 750 meter, 1926/1998 Bathymetry Grid; UTM Projection

ORWA98_750UTM is a digital bathymetric surface grid of the seafloor off the coast of Washington and Oregon. Grid cell spacing is 750m and the projection is UTM Zone 10. The surface grid was produced by merging National Ocean Service (NOS) Hydrographic Surveys conducted between 1926 and 1974 (primarily 1926 to 1930) with recent surveys conducted by the U.S. Army Corps of Engineers (USACE) in 1998 around the entrances to Grays Harbor, Willapa Bay, and the Columbia River. The results of this work represent the best available estimate of the seafloor morphology for the time period circa 1998. The user is cautioned, however, to use this data set with full knowledge of the original intent, the limitations, and assumptions used to generate it.ORWA98_750UTM 是华盛顿州与俄勒冈州沿岸海域的海底数字水深表面栅格（digital bathymetric surface grid）。该栅格的格网间距为750米，投影坐标系为UTM 10带（UTM Zone 10）。 该表面栅格通过融合两类测量数据生成：一类是1926年至1974年间（主要为1926至1930年）开展的美国国家海洋服务局（National Ocean Service, NOS）水文测量数据，另一类是1998年由美国陆军工程兵团（U.S. Army Corps of Engineers, USACE）在格雷兹港（Grays Harbor）、威拉帕湾（Willapa Bay）以及哥伦比亚河（Columbia River）入海口周边开展的最新测量数据。本数据集的成果代表了1998年前后该区域海底地貌的最优现有估算结果。但请注意，使用者在使用本数据集时，应充分了解其原始应用意图、存在的局限性及生成过程中所采用的各项假设前提。