Soil Stability from Deeter Survey

"Quaternary Geology and Stratigraphy of Kitsap County", - Jerald Deeter 1979 thesis (WWU). The original slope stability coverage was obtained by digitizing the "Slope Stability Map of Kitsap County" from the Deeter 1979 thesis. This work was performed by Kitsap County GIS. Accuracy and precision standards used for digitizing are unknown. Spatial accuracy is fairly good at small scales, however, accuracy diminishes as the scale increases. Horizontal displacement is quite noticeable along shorelines when comparison of physical features such as estuaries and peninsulas are observed along side imagery. Displacement ranges between 60 to 200 feet at different locations. Limitations of this data set are multiplied due to the spatial accuracy and constrains of the originating data and the digitizing process. This data set is useful for general area characteristics at medium to small scales (on large geographical areas), but not for characteristic determinations at large scales (on small and site specific geographical areas). **This data cannot and may not be used for or relied upon for site-specific evaluations, nor as a substitute for a field survey. - NOTE: The original Deeter work contained an "Io" stability value, which was a subcategory of Intermediate slopes. This subcategory was created and used by Deeter for those Intermediate slopes that were in excess of 30 percent grade which, at the time, had applicable on-site sewage disposal system restrictions per WAC 248-96 (Deeter). As these regulations no longer apply, the "Io" subcategory was removed, leaving all Intermediate slopes under the Intermediate (I) stability value. -《基特萨普县第四纪地质与地层学》（Quaternary Geology and Stratigraphy of Kitsap County）——杰拉尔德·迪特（Jerald Deeter）1979年于西华盛顿大学（Western Washington University，简称WWU）完成的学位论文。本数据集的原始边坡稳定性图层源自对迪特1979年学位论文中《基特萨普县边坡稳定性图》的数字化处理，该项数字化工作由基特萨普县地理信息系统（Kitsap County GIS）完成。本次数字化所采用的准确度与精密度标准尚未明确。该数据集在小比例尺下具备较好的空间精度，但随着比例尺增大，空间精度逐渐下降。将河口、半岛等自然地貌与对应影像进行比对时，可明显观察到海岸线处存在水平偏移，不同点位的偏移量介于60至200英尺之间。由于原始数据的空间精度、约束条件以及数字化流程本身的局限，本数据集的局限性被进一步放大。本数据集适用于较大地理范围内中、小比例尺的通用区域特征分析，但无法用于小范围或特定场地的特征判定。**本数据集不得用于或依赖其开展特定场地评估，亦不可替代野外实地勘测。**——注：迪特的原始研究中包含“Io”稳定性分级，该分级属于中等坡度（Intermediate slopes）的子类别。该子类别由迪特设立，用于指代坡度超过30%的中等坡度区域——彼时此类区域需遵循华盛顿州行政法典（WAC）第248-96条规定的现场污水处理系统限制要求。由于该法规现已失效，“Io”子类别已被移除，所有中等坡度区域统一归入中等（I）稳定性分级项下。