otherwise, the general appearance of the map will be misleading. The contour interval is kept constant for the contour plan. or It is the difference of elevations between two successive contours. 2: Index contours are bold or thicker lines that appear at every. Index contours are bold or thicker lines that appear at every fifth contour line. A contour interval is the vertical distance or difference in elevation between contour lines. * See explanation of attribute values for more information about how attribute values are represented. Definition of Contour Interval is defined as verticle distance between any two consecutive Contours. Answer 1:A contour line is a line drawn on a topographic map to indicate ground elevation or depression. 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. Supplementary contour lines are placed between regular contour lines to visualize small but important forms that regular contour lines are unable to show. 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. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. Used to depict depressions in the earth surface. Index contours are bold or thicker lines that appear at every fifth contour line. This is added to the IMW zone number and another unique number is created. These are each numbered 112 in a regular pattern. The next step in the numbering system is easy based on convention, there are 12 individual 1:250,000 scale maps in an IMW zone. 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. Numbering 1:250,000 Scale Topographic Maps.
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