|
GPS & GIS in Land Information System
What is LIS?
Land Information System (LIS) can be an alternative, which can provide us a better and more efficient system for Land Management. A LIS is a digital system having spatial (graphical) and non-spatial data for each land holding. Since the two are maintained in digital form it is possible to edit, maintain, rectify and keep the record up-to-date with least efforts.
It is useful for both the landowners as well as the institutions of Government, which require information for planning and implementation. Whereas people will have access to the information regarding their own holdings, institutions will be able to extract information for the entire area of their interest. It will be able to maintain and track changes, detect errors, carry out on-line corrections, and make Land Management an automated process. In order to have the accurate positional data and track the errors GPS plays a pivotal role in LIS.
Why GPS in LIS?
Global Positioning System (GPS) as the name stands can give position of a point anywhere on the globe with high accuracy. However GPS cannot be used in an area with lot of trees, high-rise buildings etc because of satellite signal interference. Conventional surveying methods for collection of Land based information, which is an input to LIS gives horizontal and vertical measurements along with relative positional value. The relative positional value from the conventional method is given with respect to local frame of reference. In order to obtain an accurate positional value at a global reference GPS technology can be the best alternative. GPS gives the precise positional coordinates where as Total Stations is used to derive the vertical and horizontal measurements. Combination of these two gives rise to the most precise and accurate Land surveys. The different utilities of using GPS and Total Stations are as mentioned below
- Finding a location. Ex. In which survey am I?
- Differential GPS for control point establishment to establish unknown coordinates
- Real Time GPS for Cadastral mapping with limited obstructions like trees, buildings etc.
- More Speed (outperforms conventional approaches)
- Lesser Cost
- Realistic accuracy
- Simple field operation (data collection is simpler over conventional methods).
|
|
