A contour maps may also referred to as a topological.
The word topography comes from the Greek words topo, meaning a "place," and graphia, which means "writing." Topography is the written or drawn depiction of a place and the study and mapping of the natural and manmade features on the surface of land. A topological is called a contour map. While all contour maps given an accurate representation, there are some differences in the types of contour maps that exist.
Topographic Contour Maps
Topographic Contour Map
A topographic map is a two-dimensional representation of a three-dimensional land surface. This map shows both the horizontal and vertical positions of the terrain. Contour lines, symbols, labels and colors are used to portray shapes and locations of mountains, rivers, lakes and other natural features of the land. Topographic contour maps also depict man-made features like bridges, cities and roads. Valuable reference information is included on the maps for base lines and magnetic declinations. Topographic maps are used in many careers such as environmental fields, urban planners, civil engineers, emergency agencies and historians.
Structure Contour Map
Structure contour map are used in extracting minerals.
A structure contour map shows features produced by deformation of the Earth's crust This type of map shows the subsurface configurations such as a fold or fault, a feature within a rock such as a fracture or bedding surface and/or spatial arrangements of rocks. Information for a structure map is gathered through geological surveys, drilling holes, mining and other geophysical investigations.
The structure-contour lines take into account all the data on the geologic structures of the area. Geologic structure-contour maps are of great importance. They are used in searching and exploring for minerals and in extracting the minerals.
Gross Contour Maps
Gross contour maps are also known as isopachs.
A gross contour map shows variations within a tabular unit or stratum, also called isopachs. Isopachs are contour lines of equal thickness over an area. Isopach maps are utilized in hydrographic survey, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology.
Net Pay Contour Maps
The final and most important map generated is the net pay map. The numbers on the map represent the net pay value for each contour. The net pay map is typically created by overlaying the top of structures with the base of the same structure and using the gross or sand map. Using a mathematical formula, the value of the contour lines is determined with respect to sea level and the contour intervals are set. Intervals are evenly spaced vertical areas between each contour line and are constant for each map. Contour lines depict the elevation at given locations of land features.
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