The book focuses on the basics of GIS without which the core
understanding about GIS is not possible. It helps the reader how to carefully
analyse and decide about placing a real world entity either as a raster or as a
vector (point, line or polygon). The book discusses the projection system which
helps the reader to understand the pros and cons associated in data conversion
from a 3D environment to a 2D environment and how the authenticity of the data
is hampered. The reader get an understanding about the characteristic features
of an ideal data to attain a quality output and points to be considered while
collecting data, reasons or sources causing the inaccuracy of data with special
reference to the vector data.
In GIS topology and associated errors is the biggest
challenge the text explains the ways and means to fix them. Further, the text
explains non topological editing and juggling the data to create a new data set
from the existing data, the way to deal with the bulky data in small segments
which are presented as a single file with no ambiguities related to feature
geometry and the mechanism to produce smooth looking features that looks visually
more appealing along with the bulky data compression with almost zero
compromise over data quality.
The reader gets the understanding of data retrieval through
query which is factor of data structuring in the database management system
which is the base for setting up a vector data model.
The most important functionality of an efficient GIS model
is presenting the data as a map (cartography) such that even a layman can
understand it with least training; this aim is achieved by discussing map
making and its important elements along with the different types of maps with
significant applications which is possible through data manipulation which is
usually addressed as data classification in more refined terms.
The book helps the reader to understand the benefits of data
exploration in GIS over statistics. Reading a tabulated or document data seems
to be less interpretable and requires a sincere attention this issue can be
resolved by representing the data in a pictorial manner which provides at a
glance view and easy understanding of any analysis. Reading this chapter one
will get to know the application of data analysis and statics analysis in GIS
environment that help in understanding the trends and changes in a geographical
vicinity along with this reader will also get to know about the different types
of queries that can be performed to analyse the data as per different user
requirements.
The content focuses on vector data analysis and simple
operations such as buffering, geometry of the entities and associated buffer,
variations in buffering, applications of buffering, basic operations of vector
data analysis such as overlay operation, its important factors and methods;
distance analysis and its applications; pattern analysis and its
interpretation; and hot spot determination. Further the content also discusses
simple feature manipulation operations such as dissolve, clip, append, select,
eliminate, update, erase and split. These geospatial analytical operations help
the user in planning projects, exploration projects and many other studies that
would have been more expensive and time consuming with less productive results
if directly performed in fields.
GIS offers a platform to study different contributing
factors for a phenomenon and attain a solution to a problem by the compilation
of the different contributing factors as per there degree of influence. Further
the reader can study and understand complex phenomenon such as trend analysis,
basics of hill shed, view shed and watershed analysis.
By the end of the book one gets the understanding about the
step by step process of GIS data modelling, the process of data validation and
what are the benefits of modelling? Ideally by the end of the chapter the
reader will have through understanding of all the concepts of GIS data
modelling such that one can handle complex problems with ease and produce the
results that are easy to understand by a layman since the end products of a GIS
models are simple charts, maps, database sheets or even the animated map and models
that require lesser fine visualization skill and provides at a glance view of
the complete analysis in a more interpretable manner.
Author(s) Details:
Varsha Waikar,
Flat No. 507 C, Wing Raj Paradise Marol Military Road, Andheri, East
Mumbai-200059, India.
Mithilesh
Atulkar,
Department of Computer Application, National
Institute of Technology, Raipur, India.
Mitul
Kumar Ahirwal,
Department of Computer Science and Engineering,
Maulana Azad National Institute of Technology, Bhopal, India.
Please see the link here: https://stm.bookpi.org/BGIS/article/view/14149
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