Question

Understanding the distinction between the vector and raster data representations is fundamental to the use of GIS. What are both the pros and cons of vector and raster datasets?

Answer 1

ANSWERS :

ANS 1.Difference between Vector and Raster :

VECTOR	RASTER
1. There is no need of scan conversion.	1. Scan conversion is required to convert the end points into the pixel.
2. They are made up of composed paths.	2. They are made up of pixels.
3. They cost more in comparison to the raster.	3. They cost less in comparison to the vector.
4. It creates smooth and continuos lines.	4. It can draw using pixel approximation mathematical curves etc.

VECTOR :

--- PROS :

- In some cases the data conversion is not required.

- They are much smaller in size than the other so provides a benifit while formating the image, which means it will be easy to update such small files.

- The objects can be edited as many times as one wants.

- The graphical ouput are more creative and eye catching.

- It has high scalibility.

--- CONS :

- If one reduces the size of image there is chance of disapperence of thin lines of the vector image.

- They are not cost effective.

- The algorithms which are used in this are complex.

- It is time consuming and not all can understand this complex theory.

- It is not possible to take photos as a vector image.

* RASTOR :

--- PROS :

- It is less costly in comparison to other.

- In this the cells have same size thus making the simulation easy.

- It uses less comlex data structures.

- The process of combining images is very easy to perform.

- The analysis method namely spatail analysis is very simple.

--- CONS :

- They are comparitvely less eye catching.

- The linkage between network is tough to establish.

- The process is time consuming if done without algorithms.

- There can ne loss of information in some cases.