Question

Advantages of gis and remote sensing over conventional means of survey:

Answer 1

1) Large area coverage: Remote sensing allows coverage of very large areas which enables regional surveys on a variety of themes and identification of extremely large features.

Remote sensing allows repetitive coverage which comes in handy whencollecting data on dynamic themes such as water, agricultural fields and so on.

Remote sensing allows for easy collection of data over a variety of scales and resolutions.

A single image captured through remote sensing can be analyzed and interpreted for use in various applications and purposes. There is no limitation on the extent of information that can be gathered from a single remotely sensed image.

Remotely sensed data can easily be processed and analyzed fast using a computer and the data utilized for various purposes.

Remote sensing is unobstructive especially if the sensor is passively recording the electromagnetic energy reflected from or emitted by the phenomena of interest. This means that passive remote sensing does not disturb the object or the area of interest.

Data collected through remote sensing is analyzed at the laboratory which minimizes the work that needs to be done on the field.

Remote sensing allows for map revision at a small to medium scale which makes it a bit cheaper and faster.

Color composite can be obtained or produced from three separate band images which ensure the details of the area are far much more defined than when only a single band image or aerial photograph is being reproduced.

It is easier to locate floods or forest fire that has spread over a large region which makes it easier to plan a rescue mission easily and fast.

Remote sensing is a relatively cheap and constructive method reconstructing a base map in the absence of detailed land survey methods.