NAD27s axis along the equatorial plane is 69.4 meters wider. WGS-84 semi-minor axis has 168.514 meters in height over NAD27. This means that NAD27 is shorter in height, but wider in width than WGS-84. Ellipsoid Semi-Major Axis Axis Flattening WGS-84 6,378,137.0 m 6,356,752.314 m 1/298.257223563 NAD27 (Clarke 6,378,206.4 m 6,356,583.8 m 1/294.9786982 1866) Comparison is 69 m wider at WGS-84 is 168.514m equatorial plane taller between poles Table showing the differences of reference ellipsoid definitions of WGS-84 and Table 1- NAD27. Step 6: The topographic distance results of all six routes were compared to the geodetic distances. Additionally, the topographic distance data gathered using the WGS-84 ellipsoid was compared to the topographic distance data gathered using the NAD27 ellipsoid as shown in Table 2. Additional Surface Dist. Geodetic Dist. Dataset Spatial Dist. (m) Topographic (m) (m) Dist. (m) Site 3228.083
NAD27s axis along the equatorial plane is 69.4 meters wider. WGS-84 semi-minor axis has 168.514 meters in height over NAD27. This means that NAD27 is shorter in height, but wider in width than WGS-84. Ellipsoid Semi-Major Axis Axis Flattening WGS-84 6,378,137.0 m 6,356,752.314 m 1/298.257223563 NAD27 (Clarke 1866) 6,378,206.4 m 6,356,583.8 m 1/294.9786982 Comparison is 69 m wider at equatorial plane WGS-84 is 168.514m taller between poles Table 1- Table showing the differences of reference ellipsoid definitions of WGS-84 and NAD27. Step 6: The topographic distance results of all six routes were compared to the geodetic distances. Additionally, the topographic distance data gathered using the WGS-84 ellipsoid was compared to the topographic distance data gathered using the NAD27 ellipsoid as shown in Table 2. Dataset Surface Dist. (m) Spatial Dist. (m) Geodetic Dist. (m) Additional Topographic Dist. (m) Site 3228.083
Bradshaw_596B_20131201.docx