Abstract:
In the present day web applications, location
based interactive requirements are increasing. WebGIS applications
are moving towards applications that have many
user levels incorporating data entry, verification and decision
making. Coordinates of a location are the most important
data for such applications. Boundary determination,
decision making, area calculation, distance measurement,
comparison of land parcels etc, are some of the functions
that need to be done for land management and assessment
process. Way points collected from Global positioning System
(GPS) units should be converted to information that can
be analyzed for land management. A reliable, efficient and
accurate GIS embedded Web application was designed by
using crop damage assessment as a case study. HTML, Javascript
and PHP were used for the development. Web
Component, GIS Component and Database Component are
the three main components of the application. Accuracy of
data were verified by using four methods. The developed
damage assessment tool was designed to store and process
field data related to crop damage and to visualize map information
to evaluate a crop damage. Incorporation of layers
include both raster and vector data. Main functions of
the applications are I. Upload coordinates and relevant photographs
II. Convert polygons into polygons III. Browse for
maps and photographs IV. Visual and value comparison of
polygons of pre and post damage extent. Higher accuracy
level of locating, efficiency and accuracy of data entering
through direct capture, remote access facilities, and easy to
use functions are the benefits of using this application.
