Contour line, Topography, Mapping, Surveying
![](https://cdn.britannica.com/94/64894-050-5B0EC4AA/diagram-contour-lines-elevation-relief-points.jpg)
Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. Imagine a land surface inundated by the sea to a depth of 100 feet (30.5 metres)—that is, the intersection of a horizontal
![](https://cdn.hswstatic.com/gif/topographic-map-colors_v2.jpg)
How to Read a Topographic Map
![](http://www.land-marksurvey.com/wp-content/uploads/2019/09/AdobeStock_117782515.jpeg)
Topographic Mapping Basics Land-Mark Professional SurveyingLand-Mark Professional Surveying
Contour Interval
How to Read a Topographic Map
![](https://evstudio.com/wp-content/uploads/2015/03/03_Imported-CAD-in-Revit.jpg)
Index Map Of Trenches And Contour Lines Are Shown Download, 55% OFF
![](https://carrollengineering.com/wp-content/uploads/2019/06/Topographic_Map-618066732_size.jpg)
Topographic Surveys: What You Need to Know
![](http://hosting.uaa.alaska.edu/afbeb/AET101/AET101_topography_files/image002.gif)
TOPOGRAPHY
![](https://i0.wp.com/i.pinimg.com/originals/67/1e/47/671e47898d707b989d98929c9a35e45a.png?resize=160,120)
Topo Maps Highest Possible Elevation – Otoelections
![](https://www.researchgate.net/publication/233557653/figure/fig3/AS:370959900004355@1465455140354/Topographic-map-showing-survey-fields.png)
Topographic map showing survey fields.