Full Answer
When would you apply resection method in plane table survey?
Resection is a method of plane table surveying in which the location of the plane table is unknown and it is determined by sighting it to known points or plotted points. It is also called the method of orientation and it can be conducted by two field conditions as follows.
What is the difference between resection and intersection?
In resection, the one point with unknown coordinates is occupied and sightings are taken to the known points; in intersection, the two points with known coordinates are occupied and sightings are taken to the unknown point.
What is 2 point resection?
Traditionally, the two-point resection problem, which is coordinating an unknown station from which lines to two control stations and the included angle are measured without setting up on the control stations (free stationing), is accomplished by solving the triangle formed.
What is 3 point resection surveying?
The three-point resection method (also known as the “three-point problem”) is used to compute the coordinates of an unknown point by occupying the resected point and measuring angles and distance toward three known points, since the angles between three known points are determined at the unknown point (ElHassan, 1986).
How do you perform a resection?
1:473:40Land Navigation: Intersection and Resection - YouTubeYouTubeStart of suggested clipEnd of suggested clipStart by getting the magnetic azimuth to the first object and converting that to a grid asmath. ThenMoreStart by getting the magnetic azimuth to the first object and converting that to a grid asmath. Then convert that to a back Asthma.
What is resection in map reading?
Resection is a method of finding one's own location on a map by sighting two known landmarks. The procedure is as follows: Find at least two landmarks on the map that can be also identified on the ground. With a compass measure an azimuth to each of the landmarks on the ground. Adjust for declination.
How many points is a resection?
As a minimum you need to have two points to resect off. You can shoot the resection point in the direct or reverse face. You can take multiple shots to the same resection point. There is no limit to the amount of points you can resect off.
How do you calculate survey resection?
3:5312:203 Point Resection Calculations - YouTubeYouTubeStart of suggested clipEnd of suggested clipTwo is green to orange. And angle three is orange to blue. So that means that when we add these twoMoreTwo is green to orange. And angle three is orange to blue. So that means that when we add these two angles. Together. We get 72 degrees 10 minutes 34 seconds plus 74 degrees 30 minutes and 21 seconds.
How do you resection a total station?
The Rules for Setting Up a Resection with a Total Station.Use a Methodical numbering system for your Resections.Always use 3 or more control points for the Resection.Don't use small angles for Resections.Try to use control points that give a 90degree angle for the total station.More items...
What is intersection in surveying?
Intersections are the group of planar surveying calculations where we use two control points (three in the case of resection) with known coordinates and certain angle/distance measurements to compute the coordinates of an unknown point.
What is the difference between resection and intersection in surveying?
In resection, the one point with unknown coordinates is occupied and sightings are taken to the known points; in intersection, the two points with known coordinates are occupied and sightings are taken to the unknown point.
What is the meaning of the phrase the intersection?
1 : a place or area where two or more things (such as streets) intersect. 2 : the act or process of intersecting. 3a : the set of elements common to two or more sets especially : the set of points common to two geometric configurations.
What is intersection in surveying?
Intersections are the group of planar surveying calculations where we use two control points (three in the case of resection) with known coordinates and certain angle/distance measurements to compute the coordinates of an unknown point.
What is intersection method of plane table surveying?
2.INTERSECTION METHOD PROCEDURE: 1) Select two points P and Q such that the points (building corners) to be plotted are visible from their stations. 2) Set the table on P and locate on the sheet. 3) Pivot on P bisect Q draw a ray. 4) Measure the distance PQ and locate Q on the sheet to a convenient scale.
What is the characteristic of resection?
The characteristic feature of resection is that the point plotted on plane is the station occupied by the plane table.
What is the process of determining the plotted position of the station occupied by the plane table?
Resection is the process of determining the plotted position of the station occupied by the plane table, by means of sights taken towards known points, locations of which have been plotted.
How does resection work?
Resection simply reverses the intersection process by using crossed back bearings, where the navigator's position is the unknown. Two or more bearings to mapped, known points are taken; their resultant lines of position drawn from those points to where they intersect will reveal the navigator's location.
What is resection in surveying?
Resection and its related method, intersection, are used in surveying as well as in general land navigation (including inshore marine navigation using shore-based landmarks). Both methods involve taking azimuths or bearings to two or more objects, then drawing lines of position along those recorded bearings or azimuths.
How does resection affect accuracy?
When resecting or fixing a position, the geometric strength (angular disparity) of the mapped points affects the precision and accuracy of the outcome. Accuracy increases as the angle between the two position lines approaches 90 degrees. Magnetic bearings are observed on the ground from the point under location to two or more features shown on a map of the area. Lines of reverse bearings, or lines of position, are then drawn on the map from the known features; two and more lines provide the resection point (the navigator's location). When three or more lines of position are utilized, the method is often popularly (though erroneously) referred to as triangulation (in precise terms, using three or more lines of position is still correctly called resection, as angular law of tangents (cot) calculations are not performed). When using a map and compass to perform resection, it is important to allow for the difference between the magnetic bearings observed and grid north (or true north) bearings ( magnetic declination) of the map or chart.
What is resection in nautical?
Resection is a method for determining a position (position finding) using a compass and topographic map (or nautical chart ).
What is the reverse of the intersection method?
The reverse of the intersection technique is appropriately termed resection.
Is resection still used today?
Resection continues to be employed in land and inshore navigation today, as it is a simple and quick method requiring only an inexpensive magnetic compass and map/chart.
What is resection in surveying?
Added an answer on November 23, 2020 at 2:12 pm. Resection is also known as free stationing in surveying which is a method of determining a location of one unknown point in relation to know points. In resection, the one point with unknown coordinates is occupied and sightings are taken to the known points; in intersection, ...
What is the process by which the position of an unknown points at which plane table is set is determined and plotted answer?
The process by which the position of an unknown points at which plane table is set is determined & plotted o the plan with the help of two or more well-defined station whose position are already plotted on the plan. In this method, the line of sight passes from unknown points to known points & the ray drawn is called as resector.
What is resection in physics?from land-navigation.com
Resection involves identifying on the terrain at least two mapped features--for example, a mountain top and a radio tower--and determining the direction of each relative to you.
How far apart should you shoot resection?from land-navigation.com
When using resection, try to have at least 45 degrees difference between the way the distance terrain features line up. With two terrain features, ideally they would be 90 degrees apart. With three terrain features, ideally they would be 60 degrees apart from one another. Of course, ideal situations seldom occur, so 45 degrees is a good number to shoot for. If your terrain features line up too closely, you lose accuracy in fixing your position. If they line up perfectly--that is the are exactly 180 degrees apart--you can't fix your position at all.
Which method is the least accurate?from sofrep.com
The modified method is the least preferred and the least accurate method but is useful in certain situations. If you’re not certain of your exact location but are located on a linear terrain feature such as a road, creek or similar body of water, this can pinpoint your position.
Why do we need resection?from verywellhealth.com
Resection may be performed for a wide variety of reasons. A resection may remove a tissue that is known to be cancerous or diseased, and the surgery may treat or cure a disease process. Depending on the tissue or organ, resection surgery may be an open surgery or may be done with a scope through a small incision or a natural entry point, ...
How is a small bowel resection done?from verywellhealth.com
The surgery can be done through an open incision or through small incisions using a laparoscope .
What are the types of ostomy surgery of the bowel?from niddk.nih.gov
The most common types of ostomy surgery of the bowel include ileostomy, colostomy, and continent ileostomy. Ileoanal pouch surgery is another type of bowel surgery that usually requires a temporary ileostomy . The type of surgery your doctor recommends may depend on why you need surgery and other factors.
What Happens During a Bowel Resection?from webmd.com
You’ll need to check into a hospital. On the day of your surgery, you’ll get general anesthesia. That means you’ll go into an unconscious, sleep-like state so you don’t feel anything during surgery.
What is a TURP surgery?from verywellhealth.com
The TURP surgery is transurethral resection of the prostate. Gastrectomy: Removal of the stomach, either full or partial, can be done for stomach cancer, ulcers, or bleeding. Lung Resection: A pneumonectomy is the removal of an entire lung. A lobectomy is the removal of one lobe of a lung. A sleeve lobectomy removes a lung and part ...
How to remove a tumor?from templehealth.org
Tumor resection surgery can be used: 1 Before chemotherapy or radiation. The goal of surgery is to fully remove a tumor. In cases where most — but not all — of a tumor can be resected, a surgeon might recommend surgical tumor resection before chemotherapy or radiation treatment so there is a smaller area to treat. 2 After chemotherapy or radiation. If the tumor is deeply embedded in critical tissues or structures in the body, doctors may recommend chemotherapy or radiation first before surgery to shrink the tumor. An initial treatment prior to surgery may also make tumor resection surgery easier and often reduces the chance of tumor recurrence after surgery. 3 As the only treatment. When the tumor hasn’t spread from its original location, the surgeon can sometimes remove the entire tumor and additional treatment isn’t necessary.
What happens when you have a bowel surgery?from healthline.com
During this surgery, your surgeon removes the diseased parts of your bowel and then reconnects the healthy parts. Your surgeon may remove all or part of your bowel.
How many points do you need to resection?
For the purposes of doing it correctly you’ll need at least two known points but obviously, three or more is ideal. There are three methods of using resection, using the map and compass method, the straightedge method and the modified method. In a perfect world, the map and compass method is the way to go.
Which method is the least accurate?
Modified Resection Method: The modified method is the least preferred and the least accurate method but is useful in certain situations. If you’re not certain of your exact location but are located on a linear terrain feature such as a road, creek or along a similar body of water, this can pinpoint your position.
When setting out or surveying from a resection or free-station setup, it is best practice to keep?
When setting out or surveying from a resection or free-station setup it is best practice to keep all the measurements or observations within the area of the resection setup. By doing this any errors that might be present in the resection or free-station setup will be contained within the area of work.
Why shouldn't you have small angles for resection?
Why you shouldn’t have small angles for resections. The best way to prove that small angles for resections can lead to large errors is by way of example. I have purposefully done a resection twice with small angles and a third time with more control stations used to provide a more robust resection.
How to set up a total station?
The Rules for Setting Up a Resection with a Total Station. 1 Use a Methodical numbering system for your Resections. 2 Always use 3 or more control points for the Resection. 3 Don’t use small angles for Resections. 4 Try to use control points that give a 90degree angle for the total station. 5 Use control points outside of the work area to mitigate errors.
What is the procedure to be unconscious before surgery?
Before surgery you'll be given either general anesthesia — which means you'll be unconscious during the procedure — or spinal anesthesia, which means you'll remain conscious. You might also be given a dose of antibiotics to prevent infection.
Where is the resectoscope inserted?
The resectoscope is inserted into the tip of your penis and extended through your urethra and into the prostate area . Your doctor won't need to make any cuts (incisions) on the outside of your body. Your doctor will use the resectoscope to trim tissue from the inside of your prostate gland, one small piece at a time.
How long do you stay in the hospital for prostate surgery?
An electrical loop cuts away excess prostate tissue to improve urine flow. You'll likely stay in the hospital for one to two days.
Why do men need re-treatment after a turp?
Need for re-treatment. Some men require follow-up treatment after TURP because symptoms don't improve or they return over time. Sometimes, re-treatment is needed because TURP causes narrowing (stricture) of the urethra or the bladder neck.
How to stop bowel movement?
Drink plenty of water to flush out the bladder. Eat high-fiber foods, to avoid constipation and straining during a bowel movement. Your doctor also might recommend a stool softener. Wait to resume taking any blood-thinning medications until your doctor says it's OK.
How long after a syringe surgery can you work?
You might not be able to work or do strenuous activity for up to six weeks after surgery. Ask your doctor how much recovery time you might need.
Resection Versus Intersection
- Resection and its related method, intersection, are used in surveying as well as in general land navigation (including inshore marine navigation using shore-based landmarks). Both methods involve taking azimuths or bearings to two or more objects, then drawing lines of positionalong those recorded bearings or azimuths. When intersecting lines of po...
Fixing A Position
- When resecting or fixing a position, the geometric strength (angular disparity) of the mapped points affects the precision and accuracy of the outcome. Accuracy increases as the angle between the two position lines approaches 90 degrees. Magnetic bearings are observed on the ground from the point under location to two or more features shown on a map of the area. Line…
References
- Mooers Jr., Robert L., Finding Your Way In The Outdoors, Outdoor Life Press (1972), ISBN 0943822416
- Kals, W.S., Practical Navigation, New York: Doubleday & Co. (1972), ISBN 0385002467
- Seidman, David, and Cleveland, Paul, The Essential Wilderness Navigator, Ragged Mountain Press (2001), ISBN 0071361103
See Also
External Links