RASTER AND VECTOR CHARTS - Abhishek Sabharwal

DIFFERENCES BETWEEN RASTER AND VECTOR CHARTS

                           RASTER                                                                          VECTOR
- Entire chart is stored as one single layer i.e        - Information is stored in layers and hence can be
  information stored cannot be displayed                 displayed selectively.
  selectively.
- Customization is not possible.                            - Chart can be designed as per the request of the user i.e
                                                                              customization is possible.
- Direct copy of a paper chart.                             - Computer generated chart.
- Chart appers cluttered.                                      - Cluttering of chart can be avoided.
- Information can only be added.                          - Information canm be added and subtracted.
- Interrogation for more information is not             - Interrogation for more information is possible.
   possible.
- Seamless charts not possible.                              - Seamless chart is a feature.
- Sensible rotation to any angle, like head up          - Possible.
   is not possible.
- Display generation takes time.                             - Faster.
- Safety departments , entering TSS etc.                - Possible.
   alarms not possible.
- Symbols and colours as that of a paper chart.      - As per IHO publication.
- Scale cannot be changed.                                    - Different scales possible.
- Zooming facility not possible.                               - Possible.
- Cheaper to produce.                                            - Costly / time consuming.
- Worldwide coverage available.                           - Coverage for all trading routes achieved.
- Memory required is higher.                                   - Memory required is comparatively less.
- This is used an interim to vector charts and           - With developement of ENC , charts will be phased
   only when ENC is not available.                                out very soon.
- Since chart is in a single layer ,no information         - Loss of information is possible and a visual indication    can be lost.                                                               is given.