There are no author-identified significant results in this report

Ahmed, S.

Azim, A.

Choudhury, A. M.

Hossain, A.

Rahman, S.

English

NASA Technical Reports Server

General Disclaimer 
One or more of the Following Statements may affect this Document 
 
 This document has been reproduced from the best copy furnished by the 
organizational source. It is being released in the interest of making available as 
much information as possible. 
 
 This document may contain data, which exceeds the sheet parameters. It was 
furnished in this condition by the organizational source and is the best copy 
available. 
 
 This document may contain tone-on-tone or color graphs, charts and/or pictures, 
which have been reproduced in black and white. 
 
 This document is paginated as submitted by the original source. 
 
 Portions of this document are not fully legible due to the historical nature of some 
of the material. However, it is the best reproduction available from the original 
submission. 
 
 
 
 
 
 
 
Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19760016571 2020-03-22T15:36:32+00:00Z
T`` Made availab!e under NOA sponsorship	 E 7.6 _ 0,3 3 3.
in the intecast of early and wide dis,^., 
semtnation of Earth,- resources Survey
Program informatic'r__!nd without liability
for any 1^3ES1	 hg Of THE HAOR AREAS OF SYLHET-,MYNENNSING
DISTRICTS WITH ERTS IMAGERIES(,WINTER ;AOP ESTIMATION)
a
i
RECEIVED
NASA STI FACILI^1f
A0 BR,,
JUN 0 81976
f by 	
J
A. M. Choudhury, A. Azim,^^
^-
/i	 S. Ahmed and S. Rahman,	 t
-	 Bangladesh ERT_S Programme.
(E76-10333) A STUDY CF THE HAGR AREAS OF
	 N76-23659
SYyHET-IYMENSING DIST1IC'7S WITH ERTB ,)
IMAGERIES (WINTEF CROP ESTIMATION) kAtomic
Energy Commissic.n) 5 'P HC $3.50	 CSCI 02C	 Unclas
G3/43 00333
Prese.p.ted at the.First Annual Bangladesh Science Conference,.,
March 28 -March 31 , , .Dacca 1976. ti
N
`vy
5
A STUDY OF THE HAOR AREAS OF SYLHET-MYh;ENSING
ll
	 DISTRICTS WITH ERTS IMAGERIES(WINTER-CROP ESTIMST_ION)
The ^aavent of Space Ar?e ha8i
 -^opene4d a new era in the exploratin,
of the earth. In the be-inninm the emp^ sis was...more on the stu vin-
the heaven from above the earth's atgO'sphero. ^Iut it has been found
that we can study-the earth also br^ter from heaven. Since the 1st
Sputnik was launched on 4th October,1957s mor,:y than 1400 spacecrafts
-have  been thrown into space .^L Of all the direct ap licatio.n satellite
systems envisaged, those for,measuring the resources of the earth show
by far the greatest promise of benefit to the world.
t ERTS Programmeamin
The meteorological satellites became . operational in ` eLrly	 \\
sixties. These satellites and the manned space f /igYt prosrammes;f	s
namely Mercury, Gemini and Apollo demonstrated. •chat not only the
weather q+f the earth but various features of the earth can be
detected by means of suitable sensors placed o._,'board the satellite,
r	 {;
To realise this end, NASA launched the first'ERTS (Earth Resources
I
Technology Satellite) later named Landsat on July 23 9 1972. Landsat-2
was launched on 22 January, 1975. The method is often called Remote
Sensing as the information which r is obtainer: about an object or
phenomenon is not in direct contact with the information gathering 	 1)
device. Both these satellites have got seven channels or bands as
k	 -they are called. The frequency ranges areas follows:-
RBV (Return Beam Vidicon)
Wave length in micrometer:
Band 1	 0.475-.575	 t,
Band 2	 0.580-.680
Band 3	 0.690-.830
REPRODUCIBILITY
OORIGINAL PAGE IS I^O TH
E
1
C
J
Id	 r
2
NSS -(14ulti8nectval`S c^ r)'
Band 4	 0.5-0.6
3aii. ,
 5	 0.6-o.7
Bawl 6 	 007 '04
Ban 7 i
uyl a ;lan of participatin^ in, the l' ,5. Prc;;ramme
the following; sectors (1) A-griculture (2) tatEr Resources
jy Forestry ( 4) Fisheries and 'Oceanography ( 55 aeo1QSy (6) Cartp;raphy
(7) Meteorology (8) Interpretation Lhnioues Development. Piesently
the Programme is sponsore:i by the Planning Comrnssio&GI
Data Interpretation	 1
All objects like water, ve !;etation, soil etc radiate electro-
" magnetic energy and receive radiation from their -surroundings. The
electromagnetic energy radiat-ec, depends* on the area, nature' and
f	 {	 %i temperature of the radiating surface. this can be detected by meansi
'k	of suitable sensors on board the satellite an i is called the s3?uctral
f
	
	
signature' of the body. This property of Physical objects -forms the
basis of muliispectral data analysis in Remote Sensinr. (;LIDFS)
Spectral response -of a particular object is not unique. Thu
there may be an overlap in the spectral siCnature of two bodies. The
measurement vector-corresponding- to a particular ground resolution
element from one part of ,a field will not correspond exa{ `tly to the
measurement vector corresponding to another ground resolution element
from the. same,field.'Vectars from the same class tend to form a cluster
of ` irq:ts. In the multispectral approach, if theme are n channelsf we
get n number of measurements for a particular ground resolution element.
,	 QVA
a
G3 —
They '?efine a mint in n dimensional Euclea ?ean Sl ace calleal Neasurement
apace, rej,resento,	 by a vector. X=(x,x21...xn). 	 This	 n	 'im nsi,.nal
measurement vector is converte<i into an	 n	 1imunsional fcaturo vcctc:r
Y=(y1	o . eyn
 ;.	 This feature vector is then	 aesi-ne	 a cl %so '.)ase^?^y2 ^..
on Statistical Decisicn Theory. Each 1>>int in the feature s.-acs. is assirner
a class Lases?{ on some oriterion 'L, N i^n-`;in7, can tl)e sj)ectral characteristics.
Analysis of the 'SYlhet-T ymensin!7h Haar Vrame j
The satellite takes ;:icture from a hei. °ht of 560 miles. `^G c'i 1
frame covers a listance of 1 1 5x115 miles. Same slot is	 after
every ei-hteen days. Tile • slices show the SYZHET-MYNZNSINGH Haor arca in
Hands 5 and 7
f
We have chosen this area as an experimental site for winter crop
estimation. We have visited a few test sites just to fini? out whet toneJJ
ro-resents what.in the actual fiele. in different bands. This 	 rocess i^&`
called finvinC the ground ,truth. We have selected band 7 and banta 5 for
a	 March, 1975. The born crop was identified in both the bands. kevery
rc:. 0-;h	 estimaterives an acrage of 11.5 acres. The A griculture Department
Figure  fc;,7 1973 is 12.3 acres. Our estimate is about 931 6 of the 1973
fi :uro which is available to us.. Perhaps we have not taken into account
very small fields. .'lots less than five acres canmot be i , entifio	 in
'RTS imageries. Th (s shows the feasibility of obj ectivc cro - estin.,-Aion
with the help of satellites. 'phis has been cone rcu;, hty with th.e unaide;"
aye." With the help of computers, it is possible to f_;et an accuracy of
98%, " or more.
Ittv-ROT)	 POOR
i
i
r	 _	 4 _
J -h in irk=: :r Gr,iv,_r-ity an ' th, ..•:ro ^rcul- ha y .. un .:.rt. L ,n
int	 r	 rri-r— with tl,,- "tivir,n.:ent11 :t:::.arch In.titu	 f
ci.i +n	 fcr ma in	 this r, -i , n wit?: the hul' of tn..ir
c .. ut-r nn ' when wF -, - t t'ic it r .-ulto- , we shall be ubl to c , : _ are
flit. r cults.	 will nlr-, visit th 1 , tc. t -jr(;,o a -ain in	 ril ju:,t
check cur resultrs.
hacr area is c, vary resourc , ^ful -.r,.a but very un •avelL,
.. stu'y of the area with the satullit, '.ata will b. very 'icl; fill f'_r
tlic i_tirral utilizati,-n of this area.
A ckn owle 't,cment:	 The author: are ^rateful t. Lr. ^nw tr i?:- sr.inj
Princi- • al Iizvvctigator, Ban_la:esh 	 tr(> r:rme an ri r'rcf. i^.I.
Chowthury, Chairman, Ge-,-,rai,hy Derartr,cnt, Jahanr , irnar •ar U:,.iver,;i'y
f-jr encuurai;ement and valuable .-Iiscursicn::.
RQf ,__-ences:
1. dilfrel E. scull: The Larth RcF urces Techncl^: y Sat 11ites
ERFr:	 A an-'. H,	 -. SH,	 1972.
2. J11ili H. Swain: Fattern Heco^niti:n 	 B3si^ for ^:c:a: to
Senr.in.- La.a -ina- 1jEis, L,,RS Inf Drrr,_:tion id ,tc 1157'
	
j, A.i•,. Chou'hury:	 intro i r cti ,n z- Mathematical , r. ac, i t
LRrS uata Intt-r--rctatiln: trocce_inr:U cf thz .icmcte "'on.-
Sc*inar, Dacca, 1975.	 '
4. Dr. .,nwzr Hossain: 3an -le, :l. sh N r,ticnal rro:-ramr^e -- f th L
Earth Resources fechnulc .y Satellite 	 1974.
5. 32n ±la lesh ,, , riculture, in Statistics: atatist cal U,:ri es
No.1 9 Ndnistry of .. rioult^r , G-vt. -f the reo lc's
Red ublic of i3anCla4esh, 1973.
1„192G'
	
OF Poo PAGN	 ;^ I ;AY 1976
+^ LN
	
^q r ,,,,	 CEI V ll n^^I r ► m10;	 "`« YI	 VASAF	 E^
STi FACIb y
	 1
"'PUT BRANCH


A study of the Haor areas of Sylhet-Mymensing districts with ERTS imageries (winter crop estimation)

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server