How do you draw a geological cross section?
- Select a section line.
- Construct a topographic profile along the line of section.
- Transfer contacts from the map to the topographic profile.
- Project dip data into the cross section line.
- Calculate and plot apparent dips on the topographic profile.
- Construct the subsurface interpretation.
What is a contour cross section?
A topographic map is a flat map representing elevations with contour lines. These contour lines connect locations with the same altitude above sea level. A cross-section is a side-on profile of a specific line that we want to draw on the map.
What is a cross section line?
In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross-sections.
What is cross section drawing in geography?
Cross sections are line graphs that show a sideways view of a landscape. They can show features such as hills and valleys, or depths, such as the depth of a river. Cross sections of hills use contour lines to determine the height of the land.
What is cross contour drawing?
Cross Contour Drawing. Definition. Essentially, Cross contour lines are drawn lines which travel, as the name suggests, across the form. Cross contour lines may be horizontal or vertical, or both, but always describe the form (three-dimensionality of an object or surface).
What is contour line method?
In cartography, a contour line (often just called a “contour”) joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.
What is a cross-section on a map?
A cross-section is a side-on profile of a specific line that we want to draw on the map. We usually represent this cross-section line starting at A and ending at A’ (A-prime). There are four steps when drawing a cross-section.
What is a line of cross-section?
A cross section or cross-section, in geology, is a diagram representing the geologic features intersecting a vertical plane, and is used to illustrate an area’s structure and stratigraphy that would otherwise be hidden underground.
What does cross-section mean in geography?
Definition: Cross-sections are represented on a map by a line which will often be labelled A at one end and B at the other. If you were to slice through the map along this line, and look back, you would be able to see what is happening underneath the ground.
How do you describe a cross-section?
Cross-section Definition In Geometry, the cross-section is defined as the shape obtained by the intersection of solid by a plane. The cross-section of three-dimensional shape is a two-dimensional geometric shape. In other words, the shape obtained by cutting a solid parallel to the base is known as a cross-section.
What is a cross-section of a river?
What is a cross-profile? River cross profiles show you a cross-section, taken sideways, of a river’s channel and/or valley at certain points in the river’s course. A channel cross-profile only includes the river whereas a valley cross-profile includes the channel, the valley floor and the sides of the valley.
What are 4 types of contour lines?
There are several different types of contour line drawings:
- Blind Contour. ‘Blind contour drawing’ is when contour drawing is done without looking at the paper AT ALL.
- Continuous Line Contour.
- Modified Contour.
- cross-contour.
- YOUR ASSIGNMENTS:
How do you use contour lines?
Put simply, contour lines mark points of equal elevation on a map. If you trace the length of a line with your finger, each point you touch is the same height above sea level. If you were to walk the path of a contour line in real life, you would remain at the same elevation the whole hike, never traveling up or down.
What are contour lines?
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.