 In cartography the manmade features are very important which are in the form of buildings or built up areas. So these are actually the areas where you have the human inputs over the surface. But those are actually also truly represented by certain symbols which are actually we can see in the form of heights here. In highlighting the heights of the area the benchmarks are very important. These are marks places on building or on other places indicating the height above sea level determined by actual service. So all these heights are determined by the service ground service which are conducted by the by the certain techniques recent techniques like total station at Pheudo light and automatic level or even GPS. So on map these are indicated by the letters benchmark followed by the heights in feet or meter above sea level. Here we have the height of the place which is written on the building side which is 348 feet above sea level. Form lines resembles contour but represents no actual elevation. Stretch from visual observation or from unreliable map source to show collectively the configuration of the terrain. These are approximately contours they are interpolated by eye sketching in between the instrumentally fixed contour. These are shown by broken lines they are easily distinguished from contour. Form lines help especially to bring out the minor details of the topography which are not easily shown by contour in an area of low relief and with large contour intervals. The next important method for representation of the relief feature when we are dealing with elevation is trigonometrical stations. These are points on the surface of the earth which were used as stations for triangulation surveys. The triangulation surveys are done by certain techniques. The older techniques are chain survey, plane table survey, Pheudo light survey, prismatic surveys and the recent tools are used in triangulation surveys which are the total station with the help of automatic level we can check the elevation of the area. Today most of the GPS are used which not only dealing with the height of the area but also it gives us the lengths and longitudes of the area. In trigonometrical stations the map is actually done by or map is made by the process of certain surveys and these surveys are actually links with the height of the region.