The elevation of the Coquille subbasin ranges from near sea level feet at the mouth of the Coquille River where it meets the Pacific Ocean, to 4,075 feet at Ophir Mountain in the southern end of the subbasin at the headwaters of Rock Creek. Each cell is assigned an elevation value which represents an approximation of the average elevation for that area. Shades of gray have been assigned to ranges of elevation values in this terrain model to illustrate the variation in terrain.
Dark shades depict the lower elevations.
Mid to high elevations are represented in increasingly darker shades. The accuracy of any elevation model is limited by the resolution of the source data which restricts the scale at which it can be accurately displayed and analyzed. No single source of data covers the entire Coquille subbasin. Higher resolution data is more accurate and can be used at larger scales of analysis. Twenty meter data has over 12 times the resolution of 70 meter data, with each cell representing about one tenth of an acre versus approximately one and one fifth acres.