Triangulation Method Crime Scene . Measurements are taken from two fixed areas at right angles of each other. In most cases, indoor scenes are shot using a variation of the baseline method, known as the 90 degree method. PPT THE CRIME SCENE PowerPoint Presentation, free download ID4047902 from www.slideserve.com The crime scene sketch is a simple line drawing that indicates the position of the body in relation to fixed and significant items in the scene (ex: The method requires two fixed reference points to locate the position of objects. Measurements are recorded from each reference point to the evidence location.
Rise And Fall Method. In an hi method less calculation is required. Consider the previous example, the determination of reduced levels for points b to e are independent calculations and do not come within the arithmetic check.
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Reduction of levels takes more time. Rise and fall method is more tedious. Levelling staff to measure vertical distances tripod the support dumpy level.
I Assume You Have The Basic Knowledge Of Various Terms Related To Leveling Like Fore Sight , Back Sight ,Reduced Level , Height Of Instrument , Etc To Obtain The Reduced Level Of A Point In The Field From Staff Readings , We Have 2 Methods :
Levelling staff to measure vertical distances tripod the support dumpy level. It is commonly used for differential. This procedure is repeated till the last.
It Is The Method Which Gives The Difference Of Elevation Between Consecutive Points By Comparing Each Point After The First That Immediately Preceding It.
The rise and fall method is the method of calculating the difference in elevation between consecutive points in levelling work. Height of instrument or collimati. Rise and fall method is more accurate.
Rise And Fall Method More Calculation Is Required.
Rise & fall method : Is not suitable for levelling with tilting levels. The reduced level (r.l.) is found by adding rise of subtracting fall to or from the preceding reduced level itself (r.l.).
Quicker And Less Tedious For Large Number Of Intermediate Sights.
Our first reading taken is our back sight, this is 2.596m, and is noted in the back sight column of the book. Surveyingthe rise and fall method. After that rl is found by adding the rise to or subtracting the fall from the reduced level of the.
Some Of The Points You Have To Know Before.
To calculate the rl of the 2nd station, you have to add or subtract the rise or fall from the given benchmark rl. Is less accurate than height of instrument method. Is negative then it is fall.
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