1. Why is it common practice to store and exchange GIS data in a geographic coor

Question

1. Why is it common practice to store and exchange GIS data in a geographic coordinate system?

2. How you would create a buffer around roads in a map file where the length of the buffer varied according to road type, and what would be the most efficient way to organize your data so that the buffer lengths for each road could be easily changed.

3. Explain why selecting the map document properties option to "store relative pathnames to data sources" should help avoid seeing red exclamation marks beside feature class names in the ArcMap table of contents.

Explanation / Answer

1.GIS enables users to do their work without needing continuous assistance.All the calculations can be calculated easily. spatial analysis is carried out using a GIS Application

Map data used is of larger scale, therefore it is common practise to store and exchange GIS data in a geographic coordinate system.

2.The buffer distance or buffer size can vary according to numerical values provided in the vector layer attribute table for each road.Buffers around polyline features, like roads, do not have to be on both sides of the lines. They can be on either the left side or the right side of the line feature. In these cases the left or right side is determined by the direction from the starting point to the end point of line during digitising.

Spatial overlay is a process that allows you to identify the relationships. The output vector layer is a combination of the input features information.

3.As it relocate the file location where the corresponding data are now stored and your map will display correctly again.

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