* See explanation of attribute values for more information about how attribute values are represented. For example, if contour lines at 50-foot intervals are used, every fifth contour line, starting with the fifth, would be an index contour. Specifically, they mark every fifth contour line that has an elevation label. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. Another crucial feature of index contours is that they represent a significant change in elevation. The intention is to manage these ID’s as persistent, however this is not guaranteed and there will be instances where what appears to be a minor change to a feature may result in a new ID being assigned. Index contours are bold or thicker lines that appear at every fifth contour line. Index contours are commonly used as a cartographic aid to assist in the visualization of contour lines. The position of the object cannot be placed within the usual accuracy toleranceĪ unique identifier for use on Topo50 data in the LINZ Data Service. Create and symbolize index contours in ArcGIS Pro. Definition Every fifth contour shall be drawn with a thicker line. The remaining contours are called intermediate contours. Used to depict depressions in the earth surface. These bolded and labeled contour lines are usually referred to as the index contour lines. Important information: Contours and height_pnts in forest and snow areas may be less accurate.Ĭoastline height_pnt sinkhole_pnt depform_edge Class attributes AttributeĪ contour added extra to the usual contour interval, added usually only over extensive areas of very low relief.
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