Posts

How Remote Sensing and GIS used for Urban Sprawl/Growth Studies

Image
Landscape metrics analysis using classified satellite images to ascertain the urban growth/change pattern…

Urban sprawl is the social process whereby cities grow and societies become more urban. Urbanization is significant all over the world. There are many factors which influence the urbanization like population growth, good prospects for livelihood, good availability of facilities etc.  Mapping from remote sensing techniques has several advantage because it is synoptic, repetitive and multi temporal. Remote sensing technique is also cost effective. Remote sensing images also provides information of change in magnitude, direction and pattern in the urban sprawl. It is a versatile tool for mapping and monitoring of natural features as well as manmade features. Because of it there is increase in research interest towards the use of remote sensing techniques for urban studies. Landscape is comprised of spatial patches categorized in different patch classes used for spatial metric calculat…

Remote Sensing Analysis for Urban Sprawl Monitoring

Image
How GIS and remote sensing can be used to monitor urban growth or land use changesUrban sprawl detection at zones level of Jaipur city for better monitoring and planning (2008-2013)
Urban Growth estimation and monitoring is important process for urban planning for future development. The current growth and past trends can help to predict future demand for urban planning. The urban growth can be assessed using data created through satellite images. Satellite data cover important aspect that is temporal information, one can map urban growth of current as well past. GIS is a versatile tool, in which mathematical and statistical concepts can be integrated very easily. Therefore, GIS tool can be used for simulation and prediction of urban patterns for future. 
To assess the urban sprawl, built-up area is quantified using temporal satellite data for 2008, 2011 and 2013. Built-up area, which refers to the residential and commercial areas, industrial complexes, roads and paved ways etc., is cap…

How Geo-Spatial Technology Used for Urban Population Analysis

Image
GIS Application for Urban Population AnalysisPopulation density change estimation in Jaipur city (2008-2013)GIS is used to map population of Jaipur city. Zone wise GIS data have been created to prepare population map. This map can be used to show the change in population as well as for further GIS based analysis such as water supply demand, public transportation demand and many more policy planning and monitoring for specific area. There are many GIS software including open source and paid available for GIS database creation and analysis. GIS database- spatial and non-spatial database created in GIS environment for this analysis. 
This population analysis start with population data collection. Population data can be collected at different levels such as state level, district level, ward level and also at village level. Initially ward wise census data collected for Jaipur city and different GIS layers created such as ward boundary, zone wise boundary etc. Attribute information assigned …

Satellite Image Information- Details of Spatial and Spectral Resolution

Satellite Image Information:There are many types of satellite images available through download and purchase options, one can select from them as per need of their project. These satellite image can be selected based on different properties of satellite image such as Spatial resolution, spectral resolution, temporal resolution and swath of satellite image (that describe the scene size or coverage area). 
A satellite can use only visible part of electromagnetic energy and some satellite use both visible and infrared part of electromagnetic energy. This is usually referred by spectral resolutions or number of band recorded in particular satellite image. 
The list is provided to understand the satellite information and use in specific need as per satellite image specification. It has information of different satellite mission details with their properties such as bands, resolution and scene size. This information can be used to acquire satellite image as per your need of project or researc…

What are the Application of Remote Sensing

Applications of Remote SensingThere are probably endless applications of remote sensing to tackle problems related to land, sea and atmospheric processes. Some of these applications are explained below- 
Land use/land cover change- monitoring of land use change from rural to urban, direction of urban sprawl, reduction in valuable agriculture land, monitoring of environmentally sensitive areas etc. High resolution images can be used to identify parking problems in city, traffic flows estimation and for various transportation studies.Agriculture- classification of crop type, examine the crop health, estimation of crop yield and forecasting crop yield, mapping of soil characteristics and soil moisture, monitoring of farming practices etc.
Forest-Forest cover type discrimination, forest inventory, biomass estimation, detect and monitor forest fires, burn delineation, monitoring the quantity and health of forests, mapping and monitoring the rate and extent of deforestation, rainforest deplet…

How Geo-Spatial Technology used for Spatial and Temporal Analysis

Image
Spatial and Temporal Analysis Jaipur & Kota city, IndiaImage processing and image interpretation for the development of land use/land cover maps was done in ERDAS Imagine software. The classified outputs were studied and analyzed to detect the change in urban sprawl. The district boundary and city boundary can be created in GIS environment using GIS software. 
Process for Spatial Analysis and Temporal Analysis using Remote Sensing DataSatellite imagery was stacked into different bands to produce a false color composite; the area of interest (study area) was extracted by sub-setting of the image
Image enhancement techniques like histogram equalization were performed on each image for improving the quality of the image. With the help of Survey of India topographic-sheets of 1:50,000 and city boundary map, the study area has been delineated. 
The pre-processed images were then classified using hybrid classification approach i.e. combination of supervised and unsupervised algorithm fol…

What is Remote Sensing

Image
Remote Sensing
Introduction The term "remote sensing," first used in the United States in the 1950s by Ms. Evelyn Pruitt of the U.S. Office of Naval Research.‘Remote’ means far away and ‘sensing’ means observing or acquiring some information. Therefore, remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object.
In our everyday living, one employ remote sensing to view different objects. Our eyes can be considered as sensors that respond to the light reflected from various objects. The data acquired by our eyes are the impulses corresponding to the amount of light reflected from light and dark areas of the object.This data is analyzed and interpreted by our brain which works like computer, to enable us to recognize the object.
Remote sensing is a tool/technique that use sensors to measure the amount of electromagnetic energy emitting an object or geographic area from a distance and then extracting the informatio…