FRSC 3010 MIDTERM REVIEW, CSI FINAL EXAM QUESTIONS
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
GRADED A++
Types of measurements used in sketching (there are 3)
1. Triangulation (most common)
2. Rectangular Co-ordinate method (useful for indoor scenes)
3. Baseline method (least accurate)
What is forensic mapping?
- measuring crime scenes with new technology like laser scanners/measurers that offer
very detailed sketches that can utilize 3D technology and incorporate photos to provide
multiple perspectives
what are the main purposes of a crime scene sketch?
- A record of the size and distance relationship of the crime scene and the evidence
found within it
- Clarifies information from photos and video , allows the viewer to easily gauge
distances and dimensions
- The easiest way to clearly present the crime scene layout and associated
measurements
when is a rough sketch drawn?
after the scene has been photographed
What is included in a rough sketch?
,- An accurate depiction of the scene including important features and objects
- Title block with date, location, name of person creating sketch
- Legend with identity and dimensions of objects in sketch
- Compass showing North direction
- Measurements must be accurate
- Sketch does not need to be to scale but proportional
what is a final diagram?
- precise rendering of the crime scene completed after visiting the crime scene created
from information in the rough crime scene sketch
-Drawn, in ink, to scale
- Neat and organized diagram
- Utilize computer aided drafting (CAD) programs to create the finished diagram
-Used primarily for court purposes
- Helps to visualize crime scene
What is included in a final diagram?
- Title Block with Date, location (address), Case #, name of person who drew diagram
and directional North arrow
- Legend (with evidence listed)
- Scale
- Body of sketch (drawn to scale)
- Labels where helpful
what kind of camera do forensic scientists use?
DSLR (digital single lens reflex)
,Why do we need photography at a crime scene?
- The scene is photographed from many different directions and angles to show the
layout of the scene,capture the position of the evidence to be collected and show spatial
relationships between items
- Ultimately they may end up being shown in court or inquests where they will be viewed
by lawyers, jurors,witnesses and the public
-Photos should be taken before the scene is processed (altered)
-The sequence will show the overall scene first, then work down to individual pieces of
evidence that can easily be related back to the larger scene
4 types of crime scene photographs
1.Overall - whole area where evidence is found
2.Midrange - specific area where evidence is found
3.Close-up - the evidence/object itself
4.Close-up with scale - evidence with scale to acquire a general size comparison
Types of file formats for pictures
- JPEG-Joint Photographic Experts Group
is the most common image format used in digital cameras
You lose some quality each time you open/close file
- TIFF-Tagged Image File Format
(high quality, large files, lossless compression)
- RAW-proprietary format
(original data, no standards)
ie: This means that Nikon has their format and Cannon has their own.
, Stores the highest quality image.
Has been called the digital "negative"
what is exposure?
The amount of light that reaches the camera sensor (CCD)
what affects exposure on camera settings
Camera settings that affect the exposure of an image are:
1) aperture 2) shutter speed and 3) camera ISO film speed*
What is aperture?
- The size of the opening in the camera lens through which light passes written as an F-
stop
- The bigger the opening the more light that passes through F4 and the smaller the
opening the less light that passes through the lens F32
What is shutter speed?
- Shutter speed is the length of time the camera shutter stays open exposing light onto
the camera sensor
- The longer the shutter is open the more light that will reach the sensor The faster the
shutter speed, the shorter the time the image sensor is exposed to light
What is ISO film speed?
A numerical rating that describes the sensitivity to light of CCD/film It brightens a photo
after the sensor has been exposed to light
- As you raise the number, the picture will get brighter but will also start to get grainier
What is Depth of field?
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
GRADED A++
Types of measurements used in sketching (there are 3)
1. Triangulation (most common)
2. Rectangular Co-ordinate method (useful for indoor scenes)
3. Baseline method (least accurate)
What is forensic mapping?
- measuring crime scenes with new technology like laser scanners/measurers that offer
very detailed sketches that can utilize 3D technology and incorporate photos to provide
multiple perspectives
what are the main purposes of a crime scene sketch?
- A record of the size and distance relationship of the crime scene and the evidence
found within it
- Clarifies information from photos and video , allows the viewer to easily gauge
distances and dimensions
- The easiest way to clearly present the crime scene layout and associated
measurements
when is a rough sketch drawn?
after the scene has been photographed
What is included in a rough sketch?
,- An accurate depiction of the scene including important features and objects
- Title block with date, location, name of person creating sketch
- Legend with identity and dimensions of objects in sketch
- Compass showing North direction
- Measurements must be accurate
- Sketch does not need to be to scale but proportional
what is a final diagram?
- precise rendering of the crime scene completed after visiting the crime scene created
from information in the rough crime scene sketch
-Drawn, in ink, to scale
- Neat and organized diagram
- Utilize computer aided drafting (CAD) programs to create the finished diagram
-Used primarily for court purposes
- Helps to visualize crime scene
What is included in a final diagram?
- Title Block with Date, location (address), Case #, name of person who drew diagram
and directional North arrow
- Legend (with evidence listed)
- Scale
- Body of sketch (drawn to scale)
- Labels where helpful
what kind of camera do forensic scientists use?
DSLR (digital single lens reflex)
,Why do we need photography at a crime scene?
- The scene is photographed from many different directions and angles to show the
layout of the scene,capture the position of the evidence to be collected and show spatial
relationships between items
- Ultimately they may end up being shown in court or inquests where they will be viewed
by lawyers, jurors,witnesses and the public
-Photos should be taken before the scene is processed (altered)
-The sequence will show the overall scene first, then work down to individual pieces of
evidence that can easily be related back to the larger scene
4 types of crime scene photographs
1.Overall - whole area where evidence is found
2.Midrange - specific area where evidence is found
3.Close-up - the evidence/object itself
4.Close-up with scale - evidence with scale to acquire a general size comparison
Types of file formats for pictures
- JPEG-Joint Photographic Experts Group
is the most common image format used in digital cameras
You lose some quality each time you open/close file
- TIFF-Tagged Image File Format
(high quality, large files, lossless compression)
- RAW-proprietary format
(original data, no standards)
ie: This means that Nikon has their format and Cannon has their own.
, Stores the highest quality image.
Has been called the digital "negative"
what is exposure?
The amount of light that reaches the camera sensor (CCD)
what affects exposure on camera settings
Camera settings that affect the exposure of an image are:
1) aperture 2) shutter speed and 3) camera ISO film speed*
What is aperture?
- The size of the opening in the camera lens through which light passes written as an F-
stop
- The bigger the opening the more light that passes through F4 and the smaller the
opening the less light that passes through the lens F32
What is shutter speed?
- Shutter speed is the length of time the camera shutter stays open exposing light onto
the camera sensor
- The longer the shutter is open the more light that will reach the sensor The faster the
shutter speed, the shorter the time the image sensor is exposed to light
What is ISO film speed?
A numerical rating that describes the sensitivity to light of CCD/film It brightens a photo
after the sensor has been exposed to light
- As you raise the number, the picture will get brighter but will also start to get grainier
What is Depth of field?
