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Assessment of Spatio-temporal Changes of Land Use in Tangail Municipality Using Gis

S. A. Mamun*
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

H. A. Runa
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

M. M. M. Hoque
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

S. Sheikh
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

R. H. Arif
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

Abstract/ Executive Summary:

Tangail district has undergone dramatic changes in its physical form through urbanization. Here, agricultural land and vegetation cover have been transformed into built-up areas; fallow land and water bodies into reclaimed built-up areas. The aim of this research was to develop land use and land cover (LULC) maps of the Tangail Municipality area in 2001, 2011 and 2017. Landsat (TM) Satellite images of the year 2001, 2011, and 2017 were used. On-screen digitization method was applied to prepare the final maps with four classes (water bodies, vegetation, agricultural land, and settlement area) of land use. The study reveals that the settlement area was increasing over the study period, and mainly agricultural land and water body were converted into settlement. It was found that about 48.73% areas were covered with the settlement area in 2017. Similarly, a substantial increase was seen in the areas of vegetation as about 824.49 ha land added to this category throughout the study years. In contrast, the agricultural land (786.30 ha) and water body (114.73 ha) were declined between 2001 and 2017.

Keywords: GIS, Land use, Natural resources, Remote sensing

Location: Tangail District

Start Date: 00-00-2001

End Date: 00-00-2017

Program Area: Knowledge Management

Non-commodity: GIS

Objectives:

The study was conducted-to identify the existing land use of Tangail Municipality using images and to compare the land use changes of Tangail Municipality in 2001, 2011 and 2017 using image.

Methodology:

Study area Tangail District is situated in Dhaka division with an area of 3365.30 hectares, is bounded by Jamalpur district on the North and Dhaka and Manikgonj district on the South, Mymensing and Gazipur district on the East, Sirajgonj district on the West (Tangail Municipality, 2013). Geographically Tangail Municipality lies on 24015 ' North Latitude and 89055 ' East Longitude. It is bounded by Kalihati and Ghatail Upazila on the North, Nagarpur Upazila on the South, Basail Upazila on the East and Sakhipur Upazilas on the West (Wikipedia, 2014). Remote sensing data Landsat TM data of 80 meter resolution of 2011, Landsat OLI data of 30 meter resolution of 2017 covering the study area have been used in the study. TM data were downloaded from U.S. Geological Survey server (http://glovis.usgs.gov). All the captured data had been converted to IMG format. Field survey data GPS data were collected from field for geo-reference as well as field verification of satellite data interpretation. Ancillary data Google imagery of 2017 has been used for small area settlement delineation using on the screen digitization. The aerial photographs have been used for 2001 and 2011 collected from SPARRSO for the same purpose. Statistical data collected from the Bangladesh Bureau of Statistics (BBS) have been used for validation of remote sensing results. Data processing and analysis The data has been analyzed using GIS software (Arc GIS 10.3.1), Google earth and Microsoft Excel. Satellite image were digitized using Arc GIS 10.3.1 image processing techniques to enable the research of land use image classes. The multi-temporal Landsat imagery has been used which helps identification of perennial and seasonally varying features of land-use. The RGB false color composite has been prepared for visualizing the land features. Then the multi-spectral classification using unsupervised (ISODATA) and supervised classification and results have been compared.

Source of Information: J. Environ. Sci. & Natural Resources, 11(1&2):245-252, 2018 ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study demonstrates the usefulness of LAND SAT or similar remote sensing data for country wise land-use mapping and change detection. The land-use maps have been produced for Tangail Municipality for 3 time frames 2001, 2011 and 2017. The broad land-use features identified are settlements, agricultural land, vegetation areas and water bodies. The results show large changes in the settlement areas and agricultural land. The area of agricultural land has decreased and that of settlement area has increased. The Study shows that about 3365 hectares area of land has been converted urban area during the last 17 years (2001-2017). The area of water bodies in 2001 was about 192 hectare and in 2017 it decreased. Vegetation area also decreased during this year. The cause of intensive land use changes of Tangail Municipality may be attributed to rapid increase of population and unplanned land use. As the study area is threatened by decreasing water bodies and vegetation due to unplanned land use, this study might be helpful to prepare an effective land-use plan for Tangail Municipality to make a planned city.

Knowledge Management: Journal