tong quat vien tham ppt 068

8/3/2019 Tong Quat Vien Tham Ppt 068

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TR NG I H C C N TH

KHOA MT-TNTN


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VI N THM 1

1. nh Ngha vi n thm v ngu n g c. 2. Nguyn l ho t ng vi n thm.

3. Cc b c sng. 4. S ph n x c a cc s v t. 5. Ti li u tham kh o.


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1. NH NGHA VI N THM

Vi n thm (Remote sensing) l mn khoa h c thu nh n thng tin v hnh dng, kch th c v tnh ch t c a m t v t th , m t i t ng t m t kho ng cch c nh, khng c s ti p xc tr c ti p n chng. i u ny c th c hi n nh vo vi c quan st v thu nh n nng l ng ph n x , b c x t i t ng v sau phn tch, x l, ng d ng nh ng thng tin ni trn.(Theo CCRS)


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Ch p nh my

bay k t ng Anh x quang


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Anh ch p t kinh kh c u

Anh ch p khu v c qu ng tr ng ba nh


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Anh ch p t v tinh


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Anh ch p t v tinh


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Vinasat-1 c khai thc 80%. nh: TPO


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Ngu n g c

L ch s

Pht tri nngnh vi nthm

Vi n thmvi t

nam

L ch s pht

tri n ngnhch p nh


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nh: VNN


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S h th ng v tinh, tr m nh n hnh nh, tr m x l d li u v ng i s d ng


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Ngu n nng l ng

S t ng tc v i i t ng

Nh ng tia pht x v kh quy n

Thu nh n nng l ng b ng b c m

S truy n t i, thu nh n v x l

Gi i onv phn tch nh

ng d ng

Nguyn l


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Tt ca cac song in t c truyn cung mt tc .

Tnh ch t

dy sng i n t Trong mi tr ng chn khng, tc song in t la C = 299.973 km/s. i v i mt ich ng dung, C = 3.10 8 m/s.


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S t ng tc gi a b c x sng i n t v v t th c th c k t qu l: c truy n qua mi tr ng v t ch t: d n n b c

x i n t b bi n i v t c . n= Ca/Cs +n: ch s khc x .

+ Ca: t c trong chn khng.

+Cs: t c trong v t ch t.


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B h p th : t o nng l ng lm nng v t ch t.Pht x b i v t ch t

B tn x :khi cc ph n t v cc h t trong kh quy n c kch th c t ng t kch th c b c sng.

B ph n x : khi b m t nh n so v i nng l ng t i.


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Cc b c sng ng n h n 0.3 micromet hon ton b h p th b i t ng ozon.

Cc lo i my + h t n c h p th ho c lm tn x cc b c sng nh h n 0.3 cm nh sng khi i qua kh quy n c m t khc

nhau b khc x , ph n x , tn x nh h ng l n

i v i vi c ch p nh hnh khng. Cc vng ph khng b nh h ng m nh b i mi tr ng kh quy n s c s d ng thu nh n

nh vi n thm.


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3.3. c i m d i ph dng trong vi n thm

Tia c c tm (0.3-0.4 micromet): b h p th b i l p ozon.

nh sng nhn th y (0.4-0.76 micromet): t b h p th v v y nng l ng d i sng ny cung c p gi vai tr quan tr ng trong vi n thm.

Tia h ng ngo i (0.77-22 micromet): c s d ng trong ch p nh h ng ngo i theo di s bi n i c a th c v t, pht hi n chy r ng v ho t ng c a ni

l a. V tuy n (1mm-30cm): kh quy n khng h p th m nh, cho php thu nh n nng l ng trong cc i u ki n th i ti t.


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3.4. Dy ph i n T

L s lin t c c a nng l ng trong d i b c sng t met n nanomet truy n

i v i t c nh sng i qua chn khng, gi ng nh v tr bn ngoi.


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Tia gamma, vng tia X, vng tia c c tm(


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Vng h ng ngo i nhi t : 3-5 m;8-14 mph i c my qut c quang h c v h th ng my thu c bi t

Vng c c ng n: 0.1-30cm Cc b c sng di h n c th xuyn qua my, x ng m v m a

Vng radar :1-30cmD ng ch ng c a vi n thm sng

c c ng n.

Vng radio >30cm t b c sng di nh t c a quang ph i n t .

M t vi sng radar c phn ra v i b c sng r t di c s d ng trong vng sng ny

Dy

Ph

i

nT


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Figure Source: http://observe.ivv.nasa.gov/nasa/education/reference/reflect/ir.html


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B ng phn lo i sng i n t v knh ph s d ng trong vi n thm

L p di sng T n s

T ngo i 100A0-0.4m 750-3000 THzNhn th y 0.4-0.7m 430-750 THz

H ngngo i

C n h ng ngo i 0.7-1.3m 230-430 THz

H ng ngo i ng n 1.3-3m 100-230 THz

Gi a h ng ngo i 3-8 m 38-100 THz

H ng ngo i nhi t 8-14m 22-38 THz

H ng ngo i xa 14-1mm 0.3-22 THz

Sng radio

0.1-1mm 0.3-3 THz

Sng micro 0.1-1cm 30-300 GHz

1-10cm 3-30 GHz

0.1-1m 0.3-3GHz

Sng c c ng n 1-10m 30-300 MHz

Sng ng n 10-100m 3-30 MHz

Sng trung 0.1-1 km 0.3-3 MHz

Sng di 1-10 km 30-300 KHz

Sng r t di 10-100 km 3-30 KHz


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Cc b c sng th ng c s d ng trong khng nh

0.0-0.4 m: tia t ngo i(ultra- violet) 0.4-0.7 m: nh sng nhn th y(visble light)0.7-0.3 m: tia h ng ngo i( infra red) 3-15 m: nhi t h ng ngo i( therme ifra-red)


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B c sng m t th ng c th nhn th y :0.4-0.5m: mu xanh d ng( da tr i) 0.5-0.6m: xanh l cy

0.6-0.7m: B c sng c a tia h ng ngo i :

B c sng ny bi n ng 0.7-3 m0.7-1.25m: tia h ng ngo i g n 1.25-3m: tia h ng ngo i trung v h ng ngo i xa


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S ph n x l ph n trm cc b c ph n x i n m t s v t v c ph n chi u ln. Ph n trm s ph n x ny thay i theo di sng khc nhau v ty theo t ng lo i s

v t khc nhau m s ph n x ny cng khc nhau (Nguy n Ng c Th ch,1997). Th ng c 3 lo i s v t chnh trong ph n x l: th c v t, t v n c


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Th c v t t N c

3 lo i s v t chnh


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3.1. c tnh ph n x ph c a th c v t


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3.2. c tnh ph n x ph c a t


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3.3. c tnh ph n x ph c a n c


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5. TI LI U THAM KH O

1. Xiuying Zhang v Xuezhi Feng, Detecting urbanvegetation from IKONOS data using an object-orientedapproach, bi tham kh o t internet 2. C.Small, Estimation of urban vegetation abundance by

spectral mixture analysis, International journal of remotesensing, Vol22 (2001)3. TS. L Vn Trung Gio trnh Vi n thm, NXB i h c Qu c gia TP. H Ch Minh (2005) 4. TS. V Quang Minh Vi n Thm 1, Khoa Nng Nghi p

HCT (2006)5. Nguy n Ng c Th ch C s Vi n Thm, i H c Qu c Gia H N i (2005) 6. http://www.rsc.gov.vn

7. http:// www.ipsard.gov.vn


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tong quat vien tham ppt 068

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