Individual spatial properties of Linear Features

Linear spatial features such as road, railway and footpath can be represented as the series of single x, y values as a chain in object mode or a series of grid cells with respect to row and columns in image (raster) mode. The length, sinuosity and direction, are some geometric properties of line features.

Some Examples

Representation of line feature in image mode is similar to the structure of representation of point feature in image mode as you can see in the following example:

Example of line feature in object mode

Example of linear feature in image mode

Example of calculating length in image mode

Calculate the length in object mode

Create the line feature using available GIS system, from your lab, based on the following table. Then find out the length of the line feature manually.

Point	X (m)	Y (m)
1	247	133.5
2	251.5	136
3	256	133
4	263	137

Calculate the length in image mode

Calculate the length of the linear feature in image mode based on the following presentation. In this presentation, all the cells that are passed through by the line significantly and insignificantly are considered for calculation of length in image mode.