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					CEGIS

CENTER FOR ENVIRONMENTAL AND GEOGRAPHIC INFORMATION SERVICES

LANDSAT TM IMAGE MOSAIC OF BANGLADESH, 1997
Te est a

Scale
Ri ver

0

100 km

BARIND TRACTS

SYLHET
O ld

The Haor Region
Br ah m ap ut ra

Jam

Ch G an ge s

al

an

una

Be

M AD

Ri

el

v e RAJSHAHI r

Ri ve r

HU

Riv er

R PU A TR S CT

M

li Ri ve r

Ka r

na ph u

The TM sensor of the Landsat satellite images the earth surface in 7 bands. Bands 4, 3, and 2 were used in this mosaic. In this band combination, vegetation including forests, crops and trees around villages appear in different shades of red. Water is shown in shades of blue, but in beel areas it appears greenish because of the presence of vegetation. Bare areas are shown in shades of white and gray.
St. Martin's Island

Go ra r ive iR
KHULNA BARISAL
P ad

e gh

DHAKA
m
R

n a

a R iv er

iv er
A LM LA IH

Megh ive na R r

S ILL

CHI TTA GON G HIL L

CHITTAGONG

e Lak tai Kap

TRA CTS

SUNDARBANS

Bay of Bengal

Moheshkhali Island

The Center for Environmental and Geographic Information Services (CEGIS) is an independent organization for Integrated Environmental Analysis using Geographic Information System (GIS), Remote Sensing, Information Technology and Databases. It is a think tank that provides solutions to stakeholders facing challenges in sectors such as, water resources, agriculture, fisheries, engineering, transportation and environment, and recommends technical options based on local realities that are feasible from the socio-economic and institutional points of view. The services and products of CEGIS relate to advice and consulting, research and development, spatial analysis, information and database, and training. The organization has been set up under the aegis of the Ministry of Water Resources supported by the Government of Netherlands. The clients of CEGIS are the Water Resources Planning Organization (WARPO), the Bangladesh Water Development Board (BWDB), other agencies of the Government of Bangladesh, and private sector organizations. The most notable of CEGIS' strengths is its multidisciplinary group of highly qualified scientists and technical professionals who are skilled in conducting integrated studies of water related problems. Its systematic approach to work, good ties with institutions within and outside the country and easy access to expertise from other countries, all contribute to the success of the organization. CEGIS is structured around its disciplines and services that include Environmental Analysis for integrated environmental studies; Spatial Analysis for interpreting and processing satellite images and GIS; Database and Information Technology for expertise in spatial databases, administration, programming of databases and Web systems; and Training on various courses. The services of the organization are supported by an administration and a finance section along with a well equipped and professional computer system unit. CEGIS has a well stocked library that contains reference materials and project documents related to environment, water resources, forestry, rural and economic development, GIS etc. and pursues communication and outreach activities.

Flood Monitoring 2002
Open water extent map derived from RADARSAT ScanSAR Wide Beam Image, 03 August 2002

Jamun

Ga

er a Riv

ng

es

r

dm

a

Ri

ve

r

Me gh n
gh n Me iver aR

Pa

aR ive r

Ri

ve

Open Water

Others

Time series of classified radar images showing changes in open water extent through 2002 monsoon.

16 June 2002

10 July 2002

03 August 2002

Open Water

Others

Khulna-Jessore Drainage Rehabilitation Project (KJDRP)
The Khulna- Jessore Drainage Rehabilitation Project (KJDRP) was taken up for removing drainage congestion on a sustainable basis in parts of Khulna and Jessore Districts in Southwest region of Bangladesh. Environmental and social impact assessment of KJDRP carried out by , CEGIS, recommended Tidal River Management (TRM) that would maintain the drainage system. Environmental, socio-economic and institutional monitoring of KJDRP by CEGIS reveal that active participation of the stakeholders through Water Management Associations (WMA) has been key to the application of the TRM concept in removing drainage congestion from more than 90% of the project area, thereby bringing down poverty level from 75% during 1993 to 53% during 2002. Change in landuse/landcover in the study area is monitored with the help of satellite images.

Zone - I Zone - H
Beel Bokar Beel Kedaria

per Up a b air Bh

Zone - G Zone - F

Beel Kapalia

Riv er

Beel Khukshia Beel Buruli

Zone - A
Beel Madhugram

Beel Dakatia

Beel Bhaina
iver

ura Riv

Hari R

Sholm ar Upper

i Rive

Zone - D Zone - B
er H am k

r

Zone - C

0

5 km

Landsat TM image March 1997

Zone - I Zone - H
Beel Bokar Beel Kedaria
per Up air Bh ab Riv

Class Name

Area March 1997 April 2001 (%) (%)

Zone - G Zone - F

Beel Kapalia

Zone - A
Beel Dakatia
i Rive r

Water (includes rivers, water-bodies, beels with and without aquatic weeds Agricultural crops Fallow land Settlements Total:

26 32 15 27 100

16 45 12 27 100

er

Beel Khukshia Beel Buruli Beel Madhugram

Beel Bhaina
iver Hari R

Zone - D
ura Rir v e

Sholm ar

Zone - B

Hamk

Zone - C

Green vegetation cover Water Moist soils Fallow lands Water Management Association (WMA) zone boundary

0

5 km

IRS 1D LISS III image April 2001

Upper

Satellite based radar image for mapping and monitoring floods of 1998

Open water extent derived from RADARSAT ScanSAR Wide Beam Image, 10 September 1998
OPEN WATER OTHERS AREA OUTSIDE IMAGE
0 20 km

Flood damage assessment in the South-West Region of Bangladesh for the year 2000

BANGLADESH

Flooded Settlements (all affected settlements could not be detected) Water, Rivers, Beels, Shrimp Ghers on Oct. 14 but not on Oct. 26 Water, Rivers, Beels, Shrimp Ghers on Oct. 26

Apparently Undamaged Aman Aman under floodwaters from Sep. 30 to Oct. 14 but not on Oct. 26 (some may survive with low yield) Aman under floodwaters from Sep. 30 to Oct. 26 (severely damaged) Scale
0 20 km

Radarsat Image of 26 October 2000 showing open water in blue.

Radarsat Image of 30 September 2000 showing open water in blue.

INDIA

Radarsat Image of 06 September 2000 showing open water in blue.

Radarsat Image of 13 August 2000 showing open water in blue.

Satellite images of the Jamuna River 1973 - 2002
Digital image processing and GIS techniques help quantify and map morphological changes from the time series of images.

Te es ta

Ri ve r

Te es ta

Ri ve r

Te es ta

Ri ve r

Te es ta

Ri ve r

Old

Old

Old

Old h Bra iver ra R pu t ma

h Bra

h Bra

h Bra iver ra R pu t ma

pu ma

pu ma er Riv tra
r Rive gali Ban

er Riv tra

r Rive gali Ban

r Rive gali Ban

g i al Ban r Rive

Sirajganj
to Kara ver a Ri

Bhuapur

Sirajganj
to Kara ver a Ri

Bhuapur

Sirajganj
to Kara ver a Ri

Bhuapur

Sirajganj
r t Kaoa ver a Ri

Bhuapur Jamuna Bridge

Aricha

Aricha

Aricha

Aricha

1973

1983

1994

2002

Bank Erosion and Accretion 1973-2000
Erosion Accretion Common Channel

Jamuna River Bank Erosion

Te es ta

Ri ve r

The highly dynamic nature of the Jamuna River causes annual erosion of tens of square kilometers of floodplain along both its banks. Over the last thirty years, this river eroded nearly 820 km2 while accretion was only 120 km2 . During this period, the erosion has made about 0.7 million people landless and homeless. Many agencies are working on protecting the banks of the river including the BWDB and FAP projects. CEGIS provides support to most of these agencies by carrying out morphological analysis and predictions based on remote sensing and other hydromorphological data. This analysis helps to plan, design, and maintain bank protection structures.
Old

Fulchari Ghat
r Rive gali Ban

h Bra pu ma

Tangail
78-80

er Riv tra

Cumulative floodplain loss due to bank erosion 1973-2000
73 within banks 73-76

76-78

80-83

83-84

84-85

Bhuapur Sirajganj
iver toa R Kara
0 10 km 85-87

Jamuna Bridge

87-89

Kalitola

89-92

92-94 94-95

Sariakandi

95-96

Mathurapara
96-97 97-98

98-99

99-2000 River Bank Protection Structure

0

1 km

Aricha

Ecological classification of a coastal area using satellite image of 2001

Mirsharai Fatikchhari

Hills & Foothills

Sitakunda

Hathazari

Agricultural lands

Village groves

Marine Ecosystem Pahartali
Landsat TM 2001

Dike vegetation

Mangroves

Feni

Noakhali
Me gh n aR ive r

Urir Char

Char Gazaria

Sandwip

Bay of Bengal
Bhola

Hatia

Understanding the physical processes of the Meghna Estuary
Monpura The Meghna Estuary is one of the most dynamic estuaries of the world. The annual rate of erosion and accretion is in the range of hundreds of square kilometers. Over the past half a century, the average 2 net accretion has been about 18 km per year. The retreat of the shoreline is in many places found to be in the order of hundreds of meters per year causing enormous suffering to the inhabitants of the estuarine lands. To improve the living conditions of the people and for sustainable development of the estuary, a good understanding of the physical processes of the estuary is a pre-requisite. CEGIS carries out morphological studies using remote sensing and other hydromorphological data in support of various agencies working to develop the estuary.

Nijhum Dwip

Text to go here
Mosaic of Landsat 5 TM Image of 14 January 2001 and Landsat 7 ETM+ image of 28 January 2001 covering part of the Meghna Estuary.

Center for Environmental and Geographic Information Services
House 49, Road 27, Banani, Dhaka-1213, Bangladesh Phone: 8817648-52, 8821570-2 Fax: (880-2)8823128, Email: egis@cegisbd.com Web: www.cegisbd.com

COVER PHOTO: Example of Terra MODIS RGB imagery product acquired on 19 March 2002. Source: NASA website.


				
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posted:5/25/2009
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