Introduction to Topo Maps
Introduction to Topo Maps
A topographical map is a type of map that shows the natural and man-made features of an area in great detail. The map is typically based on detailed surveys of the area, and it is designed to show the shape and elevation of the land, as well as the location of features like rivers, lakes, roads, and buildings.
To read a topographical map, the first thing you need to do is identify the various features that are shown on the map. This can typically be done by looking at the map's legend, which is a small box that is usually located in the bottom right corner of the map. The legend will show you what each symbol on the map represents, and it will also tell you the colors that are used to represent different types of features.
Once you know what the various symbols on the map represent, you can start to interpret the map. To do this, you will need to look at the contour lines that are shown on the map. These lines are used to show the elevation of the land, and they are drawn at regular intervals, typically every 10 or 20 feet.
The contour lines on a topographical map will form a series of concentric circles around hills and mountains, and they will form a series of V-shaped patterns around valleys. The closer the contour lines are to each other, the steeper the slope of the land is.
In addition to the contour lines, a topographical map will also show the location of natural features like rivers, lakes, and forests. These features are typically shown using different colors or symbols, depending on the type of feature. For example, rivers are usually shown in blue, while forests are typically shown in green.
Another important feature of a topographical map is the grid system that is used to show the location of different points on the map. This grid is typically based on the township, section, and range system, which is used to divide land into small, easy-to-manage units.
The township, section, and range system is based on a grid of horizontal and vertical lines that are used to divide the land into a series of squares. Each square is divided into 36 smaller squares, called sections, and each section is further divided into quarter-sections.
To read a topographical map using the township, section, and range system, you will need to locate the horizontal and vertical lines that form the grid on the map. Once you have found these lines, you can use them to determine the location of any point on the map.
For example, if you want to find the location of a particular river on the map, you can use the grid lines to determine the township, section, and range where the river is located. This will give you a precise location for the river, and it will allow you to navigate to the river using the grid system.
In summary, reading a topographical map is a skill that takes practice and patience. By familiarizing yourself with the various symbols and features that are shown on the map, and by learning how to use the grid system to locate points on the map, you can quickly become proficient at reading topographical maps.