Ch 6 collecting your data


Published on

Published in: Education
  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Ch 6 collecting your data

  1. 1. 1 Collecting your data Chapter no 6
  2. 2. 2 Form design  Design of form is very important as most of information from forms will be placed on computer system  Relevant information is included  For good design of form following information are needed  Who will be using the form ?  Headings  Instructions  Layouts  Sections  Testing
  3. 3. 3 Coding data  Codes are used to represent information  There are following reasons for using codes  Are quicker to type  Reduces the size of files  Increased the speed of searching  Codes are often be unique
  4. 4. 4 Designing codes  There are certain points are remember for designing a coding system  Codes should have same length  Codes must be easy to use  Codes must not be too short
  5. 5. 5 Data Capture ( Putting detail into computer  Getting the information into a structure in which it can be processed by the computer is called data capture.  Method 1. Key to disk is suited for small amount of data ,in this typing is involve and there is much error in code and takes lot of time to put information by keyboard 2. Automatic reading data from the form
  6. 6. 6 Methods  Magnetic ink character recognition (MICR)  Optical Mark reader (OMR)  Bar code Reader (BCR)  Optical character Recognition (OCR)  Speech recognition
  7. 7. 7 Examples of automatic data Flood Warning  It is not feasible for a river’s water level to be constantly monitored by human staff.  Instead sensors are used to measure the water level  Radio links sends the data from the sensors to the main computer and if there is danger of flooding  So in this way emergency services can be altered and flood warning issued.
  8. 8. 8 Automatic data capture using signals  Not all data to be entered using a keyboard or special forms.  Some data can be entered directly into a computer in the form of electronic signals  This data comes from sensors detects which produce signals that depends on physical quantities.  Examples: components passing along a production line could break the light beam as they pass  The traffic flow along a certain road is measured by pressure sensors which records a pulse every time a vehicle passes over them.
  9. 9. 9 Remote Sensing  Sensing at a distance  Electronic signals from remote sensors can be sent through telephone wires  Such a system is ideal for remote weather stations which send the data to a central computer  Example: to detect when a river is likely to burst its banks, river authorities also use sensors to monitor the water quality to our rivers and to give pollution alert.