Qudn Iy tai nguyen rin*^ & Moi truamg^
^ THU" NGHIEM PHU'ONG PHAP LAM TRON DU'CJNG LO SAU GIAI DOAN TlT ANH VE TINH
Pham Vdn Duan, Vu Thi Thm, Nguyin Quang Gidp 77i5. Trudng Dai hpc Ldm nghiep
T O M T A T
Cong ngh? viln tham dugc chiing minh co nhiSu im diSm va trien vong trong A\h\x tra rimg, nhSt la trong viec xay dung ban do hien trang rimg va theo doi diln biln di?n tich cac trang thai va chit luong rimg 6 nuoc ta.
M9t trong nhung buoc cong viec mk nhilu then gian sau giAi doan la lam tron duong 16 dS bien tap ban do hi?n trang rimg. Bai bao sit dung m^t so phSn mgm chuyen dung, lop ban d6 sau giai doan tir anh v? tinh SP0T6 tai xa Quang Thanh, thi xa Gia NghTa, tinh Dik Nong, cac ban d6 va tai lieu phii tn?... de lam tron duong bao 16 bang 3 phuong phap: 1) BSng cong cu co sin tren phSn m i m eCogration; 2) BSng c6ng cu co san tren phan mim ArcGIS; 3) B5ng to hgp cac cong cu tren phSn m i m ArcGIS. Kit qua cho thiy sai so ve di?n tich xac dinh theo phuong phap binh phuong nho nhit ciia lop ban do lam tron theo phuong phap 3 so voi 1<^ ban do sau giai doan 6 d p 16 rung la 9,4 va 6 cip trang thai rimg la 0,03. Cac gia tri nay nho hon so voi sai so khi lam tron bing phuong phap 1 (Sai s6 cdp Id: 665,8; cdp trgng thdi: 0.11) hoac phuong phap 2 (Sai so cdp 16:J2.9;
cap trgng thdi: 0,06). Tir kit qua nghien ciiu da xac dmh cac budc ky thuat lam tron duong 16- 1) Chuyin lop ban d6 sau giai doan tir dang viing thanh dang duimg; 2) Lam tron lop ban d6 dang duong; 3) Chuyen lop duong sau lam tron thanh lop viing va cap nhat dii lieu de su dung.
Tu khoi: Hipt trgng rimg, phan mem ArcGIS, sau gidi dodn, SP0T6, tran du&ng Id.
I. DAT VAN DE
Ban dd hi^n trang rimg Id rapt trong nhiing cdng cu quan trong cho qudn ly tai nguyen riing. Mot trong nhiing phuang phdp trifin vong nhat hifin nay de xay dirag ban do bien trang rimg ddra bdo khoa hpc, chi phi hop ly vdi dp chinh xac can thiet vd du(?c cdp nhat thudng xuyen cbinh la ung dyng cdng nghfi vifin thara vd he thfing thdng tin dia ly de giai dodn trang thai, trii luong cua cac khu rimg.
Cong tac xay dung ban dd hi?n tr^ng rirag tir anh vfi tinh va sd lieu thuc dia gdm 2 budc chinh: 1) Giai dodn dnh va; 2) Bien tap ban do hifin tr^ng. Trudc ddy viec gidi doan anh chit yfiu Id khoanh ve true tifip trfin nfin dnh bdi cdc ky thudt vifin dodn doc thong qua cac phan mfim chuyen dung. Cach gidi doan ndy phy thupc vdo kinh nghifim cua ngudi gjdi doan, thuimg cd sy khong ddng nhdt ve kfit qua giiia nhung can bp gidi dodn khdc nhau, radt nhieu thdi gian, nhung dudng Id trfin ldp ban do kfit qua gidi dodn tron va cd thfi sii dung ngay dfi
bifin tap bdn dd hien trang. Hifin nay, vific gidi doan chu yfiu dupc thuc hifin tu dpng bdng cac phdn mfim chuyfin dyng. Vdi phuang phap nay vira tifit kifim dupc thdi gian lai it bj dnh hudng cua yfiu to kinh nghiem ciia nguoi giai doan nhung dudng Id tren bdn dd kfit qud gidi doan khdng tron md dich ddc theo do phan gidi cua dnh ve tinh, nfin sau gidi doan phai mat nbifiu cdng de lam tron dudng bao Id.
Mat khac, trfin cdc phdn mfim giai doan anh chuyen dung nhu: Erdas, Ecognition, ArcGIS...
deu cd sdn cdng cu dfi lam tron dudng Id sau giai doan. Tuy nhifin, theo danh gid thi cdc cdng cu nay cho hinh dnh dudng Id lam tron thudng khdng phii hgp vdi nfin dnh ve tinh theo mong mudn.
Vi vay,"Thu nghiem phuang phdp ldm tran du&ng Id sau gidi dodn tie dnh vf tinh'*
dupc thuc hifin nham de xuat cdc budc ky thudt Iam tron dudng bao Id rimg va dat khdng cd rimg sau gidi dodn, nang cao hifiu suat cua cdng tdc xdy dung bdn do hien trang tir kfit qud giai doan anh v? tinh.
38 TAP C H i KHOA HQC VA CONG N G H $ LAM NGHIEP S 6 2-2015
Qudn ly tdi nguyen rung & Mdi trucmg
U- PHirONG PHAP NGHIEN ClJtJ 2.1. Mijc tieu nghi&n cun
Xdc dinh cdc budc ky thugt lam tron duong bao Id rimg va dat khdng cd rirag nbdm ndng cao hifiu qua cdng tdc xdy dung ban dd hifin trang rimg tir kfit qua giai doan anh ve tinh.
2.2. N§i dung nghien cmi
- Nghien ctiu hifiu qua Iam tron dudng 16 sau gidi doan tren mpt sd phdn mfim thdng dung.
- Nghifin CIIU ky thudt lara tron dudng 16 bang to hop cdng cu trfin phdn mfim ArcGIS.
2 3 . \%i lieu nghien cihi
De thuc hifin cac ndi dung nghien cuu trfin, vat lieu nghifin cuu nhu sau:
- Ldp ban d6 sau gidi doan tir dnh SP0T6 tai xd Qudng Thanh, Thi xd Gia Nghta, tinh Dak Ndng.
- Bdn dd rd sodt quy hoach ba loai rung xa Qudng Thanh, Thi xa Gia NghTa, tinh Ddk Nong nam 2013.
Cac phdn mfim; eCognition, ArcGIS, Mapinfo, Excel.
2.4. Phirong phap nghien cihi
2.4.L Phuang phdp nghien cuu hieu qud ldm tron du&ng Id sau gidi dodn tren mpt so phan mem thong dung
Trfin cac phan mem gidi doan dnh ciing nhu cdc phdn rafim thupc he thdng thdng tin dia ly deu cd chiic nang ldm tron dudng bao Id.
Trong npi dung ndy, bdi bao nghifin ciiu hifiu qua ldm tron duong bao Id sau giai doan tai xa Quang Thanh, Thi xa Gia NghTa, tinh Ddk Ndng trfin 2 phdn mem hay dupc su dyng trong gidi dodn vd bifin tap ban dd thanh qud sau gidi dodn: 1) Phdn mem Ecognition; 2) Phdn mem ArcGIS. Cu thfi:
- Su dyng ldp bdn dd sau giai dodn chua ldm tron dudng bao Id ciia xa Qudng Thdnh, Thi xd Gia NghTa, tinh Ddk Ndng (Ldp ban dd 1).
- Sii dyng chtie nang Export results/Polygon smoothed trfin phdn mfim Ecognition dfi lam
tron dudng bao Id ciia Idp bdn dd 1 dupc idp bdn do lam tron bang cdng cy cd sdn trfin phdn mfim eCognition (Ldp bdn dd 2).
- Sti dung cdng cu ArcToolbox/Cartography Tools/Generalization/Smooth Polygon trfin phdn mem ArcGIS dfi Idm tron dudng bao Id ciia ldp bdn do 1 dupc ldp ban do lam tran bang cdng cy cd san trfin phan mfim ArcGIS (Ldp ban dd 3).
Hai ldp bdn do (Ldp bdn do 2 va ldp ban dd 3) tao ra sau khi lam tron dudng bao Id dupc sii dyng de so sanh vdi Idp ban dd chua lam tran ban ddu (Ldp ban dd 1) dfi ddnh gid hifiu qua thdng qua 2 loai sai so: 1) Sai s6 di|n tich theo Id; 2) Sai s6 difin tich theo trang thai.
- Sai sd difin tich theo Id
Tinh difin tich cho tirag 16 trfin 3 ldp bdn d6 (1,2,3) bang ham CartesianArea(obj, "sq m") trfin phdn mfim Mapinfo.
Chon ngdu nhien 10 Id rirag trfin Idp bdn dd 1 va ghi thdnh ldp rifing theo cdc budc: 1) Ddnh sd thii tu Id ctia ldp ban dd 1 tir 1 dfin het trong tdng sd 11.503 Id bdng hdm Rowid tren phdn mfira Mapinfo; 2) Chpn ngau nhifin 1 16 trong 11.503 Id tren ldp ban dd 1 bang ham ngau nhifin Random trfin phdn mfira Excel; 3) Chpn 9 Id cdn lai theo phuang phq) he thong, Cli 900 difim Idy 1 difim, trong trudng hpp chpn dfin cudi danh sdch vdn chua dii sd difim thi tien hanh chpn ngugc lai tii difim cd sd thii tu 1; 4) Cdc Id rirag lua chpn dugc ghi thdnh ldp rifing.
Chpn 10 Id riing tuang ung trfin ldp bdn dd 2 va 10 Id rirag tuong ling trfin ldp ban dd 3
Xac dinh sai sd theo 16 ciia Idp bdn do 2 vdi ldp ban dd 1, cua ldp bdn dd 3 vdi ldp bdn dd 1 bdng pbuong phap binh phuang nhd nhat.
r = ^E(y<-/(^0)^
(2.1)Trong dd: X la sai s6; n Id sd cap Id so sanh (10 cap); yi la dien tich Id i trfin ldp bdn do 1;
f(x,) la difin tich Id tuong iing trfin ldp ban dd 2 hoac 3.
TAP CHI KHOA HQC VA CONG NGHE LAM NGHIEP SO 2-2015
Qudn ly tdi nguyen runs & Moi trudng - Sai sd dien tich theo trang thai rirag va dat
khdng cd rimg.
Tmh difin tich cho tirag Id tren 3 ldp bdn dd (1,2,3) bdng ham CartesianAiea(obj, "hectare") trfin phan mfim Mapinfo.
Xac dinh tdng dien tich cua timg trang thai rung va dat khdng cd rirag trfin ldp bdn dd 1.
Xac dinh tdng difin tich cua tirag Irang thai rimg va dat khdng cd rirag tuong ting tren ldp ban dd 2 va 3.
Xdc dinh sai sd difin tich theo trang thai cua ldp ban dd 2 vdi ldp bdn dd 1, cua ldp bdn dd 3 vdi ldp bdn dd 1 bang phuong phap binh phuang nhd nhdt thdng qua cdng thiic (2.1).
Trong dd: X^ la sai sd; n la s6 c^p tr^ng thai so sdnh; y, la difin tich trang thai rimg hoac dat khdng cd rimg tren ldp ban dd 1; fljx,) la difin tich trang thai tuong iing tren Idp bdn dd 2 hoac 3.
2.4.2. Phuang phdp nghiin cuv ky thuat ldm tran du&ng Id bang td hpp cdng cu trin phhn mim ArcGIS
Tir ket qud nghifin ciiu d npi dung thii nhat ket hpp vdi phuang phdp chuyfin gia tim hifiu cac cdng cu trfin phdn mem ArcGIS dfi thuc hi?n ldm tron dudng bao Id.
Danh gid hifiu qud Idra tron dudng bao Id theo ky thu|t radi tao ra.
Ldp ban do tao ra sau khi lara tron dudng bao Id theo ky thuat mdi (Ldp bdn do 4) dugc sii dyng dfi so sanh vdi ldp bdn dd chua lara tron ban ddu (Ldp bdn dd 1) dfi ddnh gid hifiu qua thdng qua 2 loai sai so: 1) Sai sd di?n tich theo 16; 2) Sai so difin tich theo trang thai.
- Sai s6 difin tich theo Id
Tinh di?n tich cho timg Id hfin ldp bdn do 4 bdng hdm CartesianArea(obj, "sq m") trfin phan mfim Mapinfo.
Chpn 10 Id rimg tuong iing trfin ldp bdn dd
4 theo 10 Id rirag da chpn trfin ldp ban d6 1 6 n^i dung nghifin ciiu tren.
Xac dinh sai so theo Id ciia ldp ban dd 4 vdi ldp bdn do 1 bdng phuong phap binh phuang nhd nhdt theo cdng thiic (2.1).
Trong do: X^ la sai so; n la so cdp Id so sdnh (10 cap); yi la difin tich Id tren ldp ban dd 1;
f(xi) la difin tich Id tuong iing trfin Idp ban dd 4.
- Sai so theo trang thdi rimg vd dat khdng cd rimg.
Tinh dien tich cho timg Id trfin ldp ban do 4 bdng hdm CartesianArea(obj, "hectare") trfin phdn mfim Mapinfo.
Xdc dinh tdng difin tich ciia tirag trang thai rimg va dat khdng cd rimg drfin ldp ban do 4.
Xdc djnh sai sd theo trang thai ciia ldp ban dd 4 vdi ldp bdn dd 1 bdng phuang phap bmh phuong nhd nhat theo cong thiic (2.1).
Trong dd: X^ Id sai s6; n Id sd cap trang thai so sanh; yi la difin tich trang thai rimg hoac dat khdng cd rimg trfin ldp ban do 1; ffxj) la difin tich t r ^ g thai tuong iing trfin Idp ban dd 4.
UI. K£T QUANGHIEN CUtJ V A T H A O L U A N 3.1. Hi^u quS Iam trom dirdng Id sau gidi dodn tren mdt so phan m i m thong dung
Trfin cac phan mfira gidi doan dnh thdng dyng dfiu cd chiic nang ldm mfim dudng 16 sau giai dodn nhdm muc dich ho trg cdng tdc xdy dung bdn do hifin trang sau giai doan. Nhimg tren tirng phan mfira giai doan dnh khdc nhau, chiic nang ldm tron cd su khac nhau nhat dinh.
Trong npi dung nay, bai bao trinh bay hieu qua Iam tron dudng 16 bdng cdng cy cd sdn trfin 2 phan mem thong dyng Id: eCognition va ArcGIS vdi ldp ban do sau gidi doan tu phan mfim eCognition chua lam tron tai xa Qudng Tbanh, Thi xd Gia NghTa, tmh D&k Ndng. Hifin trang rirag va dat chua cd rimg trfin dia ban xa dugc tap hpp d bdng 3.1
T ^ P CHI KHOA HQC VA CONG N G H $ LAM NGHIEP SO 2-2015
Qudn ly tdi nguyen rOmg & Moi trudrng
Bang 3.1. Set qud gidi dodn hien trang rimg vd dot chua cd rirng xd Qudng Thdnh TT Maldir Ldir ' • lYiaiair LQir i en lair Ten Idir
I Dien tich rung va d4t chira co rimg trong quy hoach ba Ioai rmig T TA z n n.' - .. L : - •: ii... i ' _ i ...1 ;! v, ^k..
Dign tich (ha) 3.565,3
txg Rimg gd ty nhifin mii dat id rdng thuorng xanh gidu 3,9 txb Rirag gd ty nhifin ntii dat la rdng thudng xanh trung binh 1.449,9 txn Rimg go tu nhien ntii dat la rdng thudng xanh ngheo 64,2 txk Rimg go tu nhifin niii ddt la rdng thudng xanh ngheo kiet 10,6
tnk Rirag tre niia khdc niii ddt 4,2 Rimg trdng gd niii ddt 55,6 Dat da trdng trfin niii dat 0,3 Dat trdng cd cay go tai sinh 62,8 Ddt trdng khdng cd cay gd tai sinh 61,4 rtg
dtr dt2 dti 10
II
88 nn Dat nong nghiep nui dat Dien tfch dSt ngo^i quy hoach ba lo^i rirng
T6ng
1.852,4 4.205,3 7.770,6 Hinh dnh cdc 16 rirag vd ddt chua cd rimg
sau gidi doan trfin nen dnh ve tinh SPOT6 dupc
minh hga tai hinh 3.1.
Hinh 3.1. Hinh dnh Id rung vd ddt chua cd rimg sau gidi dodn
Ket qud sti dyng cong cy Polygon smoothed dfi trfin phdn mem eCognition vd chong xep trfin anh ldm tron dirdng bao 16 rimg va dat khdng cd rimg ve tinh SPOT6 dugc minh hpa tai hinh 3.2.
T ^ CHI KHOA HOC VA CONG NGHE LAM NGHIEP SO 2-2015
Qudn ly tdi nguyen rim^ & Mdi tru&ng
Hinh 3.2. Uinh dnh Id rimg vd dat chua co rung ldm tran bdng phan mim eCognition Tir lunh 3.2 thay: ve mat hinh dnh dudng Id vdi nfin anh bfin dudi.
sau lam tron da hdu nhu loai bd dupc hi^n tugng dich dac so vdi dudng 16 sau gidi dodn.
Tuy nhifin, dudng Id tao ra vdn cdn nhieu do^n gap khiic dpt ngpt ddn den su khdng phu hpp
Kfit qua su dyng cdng cy Smooth Polygon trfin phan mem ArcGIS dfi Iam tron dudng bao 16 rimg vd dat kh6ng cd rimg va ch6ng xfip tren dnh vfi tinh SP0T6 duoc minh hpa tai hinh 3.3.
Hinh 3.3. Hinh dnh Id rimg vd dat chua co rung ldm tran bdng cong cu Smooth Polygon tren phan mim ArcGIS
lix hinh 3.3 th^y: vfi radt hinh dnh dudng 16 sau ldm tron da Ioai bd dupc hi^n tugng di'ch ddc so vdi dudng 16 sau gidi dodn, dudng 16 bam sat vdi ranh gidi hifn tr?ng trfin dnh ve tmh. Tuy nhien, khu vuc tifip giap giiia 2 Id rimg Iai b} hd ho$c chong de nhdt la khu vyc tiep giap giiia 3 16 trd Ifin, dfi khdc phuc hien
tupng ndy ddi hdi phai mdt nhifiu cdng siic trong qud trinh bien tap bdn do sau ndy.
Dfi ddnh gia hifiu qua lara tron dudng Id bang 2 phuang phdp nfiu h-fin, tdc gid sir dung 2 Ioai sai so: 1) Sai sd difin tich theo 16; 2) Sai so difin tich theo trang thai. Kfit qud dugc t?p hgp d bdng 3.2 va bdng 3.3
TAP CHI KHOA HQC VA CONG NGHE LAM NGHIEP S 6 2-2015
Qudn ly tdi nguyen rirng & Moi tru&ng
Bang 3.2. Sai so dien tich theo Id khi Idm tnfn bang cdc phan mem thdng dung DiSn tich . * _ Dien tich 16 lam tron bang
ldm tron tren ; „ . . . . „ , lo 1 1 , „ , -, ,.z cong cu Smooth Polygon . , . ^ . phan mem ((Yi-f(Xi))' ^ . •» x . ' ^ , „ giai doan tren phan mem ArcGIS
Difn tich 18 liim tr(m tren
phan mem ecognition (f(iO)-(m')
4.409,9 6.138,5 13.206,9 16.003,5 19.662,2 7.281,6 1.0811 7.781,2 7610,5 8.116,5
((Yi-f(ii))'
70,56 702,25 702,25 324,00 282,24 462,25 979,69 466,56 324,00 635,04 1 4.418,3
2 6.112,0 3 13.233,4 4 15.985,5 5 19.679,0 6 7.303,1 7 10.842,3 8 7.759,6
4.417,7 6.111,7 13.232,5 15.984,1 19.678,5 7.299,1 10.841,3 7.759,0 7,627,5 8.140,6
0,36 0,09 0,81 1,96 0,25 16,00 1,00 0,36 1,00 1,21 9 7.628,5 7610,5
10 8.141,7 8.116,5 Tdng 101.103,4 101.021,8 Sai so
324,00 635,04 6.65836 6«5,8 Bang 3.3. Sai so di^n tich theo tr^ng thdi khi lam trtm bang'
7,627,5 8.140,6 101.092,0
cdc phan mem thong dung 1,00 1,21 129,96 12,9
Di^n ti'ch l^m Dien tich lam tron Di|ntich tro'n bdng cong cu _ _ maid trang thai tr§n p h k irv: tt^wi Smooth Polygon ((Yi-
I t . luir . , . . . , 1 t t i l-linnz 1 1 ri ...
Ir giai doan mem fren phan mem f(Kj))Z (Yi) (ni2) ecognition ArcGIS
(f(xi))-(ha) (f(q))-(ha) 1 14 txg 3,90 4,20 0,09 3,90 0,00 2 15 txb 1.449,90 1.449,00 0,81 1.449,90 0,00 3 16 txn 64,20 64,20 0,00 64,20 0,00 4 17 txk 10,60 10,50 0,01 10,70 0,01 5 52 tnk 4,20 4,20 0,00 4,20 0,00 6 60 rtg 55,60 55,90 0,09 55,60 0,00 7 72 dtr 0,30 0,30 0,00 0,30 0,00 8 78 dt2 62,80 62,60 0,04 62,80 0,00 9 82 dti 61,40 61,70 0,09 61,90 0,25 10 88 nn 1.852,40 1.852,70 0,09 1.851,80 0,36 11
Ting Sai so
Ngoai
LN 4205,30 7.770,60
4.205,30 7.770,60
0,00 1,22 0,11
4205,30 7.770,60
0,00 0,62 0,06 Tir ket qud xdc dinh sai sd di?n tich theo 16 qua sii dung c6ng cu Smooth Polygon trfin va theo trang thdi khi Iam tron dudng 16 bdng phdn mfim ArcGIS dfiu nhd hon so vdi phucmg mgt s6 phdn mfim th6ng dyng thdy: Sai sd difin phap Idm tron dudng bao 16 sir dung phdn mfira tich theo Id va sai sd difin tich theo trang thdi eCognition.
ciia phuang phdp Iam tron dudng bao Id thdng
T ^ CHI KHOA HQC VA CONG NGHE LAM NGHIEP SO 2-2015 43
Qudn ly tdi nguyen rihi^ & Moi tru&ng 3.2. Ky thuat I^m trom dirfrng 16 bSng to hop
cong cu tren phan mem ArcGIS
Tir kfit qud nghifin ciiu tai ndi dung 3.1 thay:
lara tron dudng 16 bdng cdng cy Smooth Polygon tifin phdn mfim ArcGIS cho kfit qud dudi^ Id sau lam fron bam sdt hifin trang trfin anh va sai sd nhd hon so vdi thuc hifin trfin phdn mem eCognition. Tuy nhifin, lam tron bang cdng cy nay cd nhuge diem Id 2 Id c^nh nhau khdng triing khit ve dudng bifin chung. Nguyfin nhdn ciia hifin tugng nay Id do each qudn ly du li^u do hpa trfin phan mfim ArcGIS tao ra. Cdch qudn ly dii lieu dd hga dang vung va diaig dudng trfin phdn mfim ArcGIS ndi rifing va tren cdc phdn mfim thugc he thdng thdng tin dia Iy ndi ehung dupc minh hpa tai hinh 3.4. Trfin hinh 3.4 the hien 2 Id canh nhau la: Id 1 (ACBEA) vd Id 2 (ADBFA), cdch qudn ly dii li$u do hpa trfin ph4n mfim ArcGIS nhu sau:
- Dang vimg: mdi Id la mot doi tugng rifing bifit. Nhu vdy khi Iam tron, khu vuc t i ^ ^ d p gifta 2 Id (AEB ctia Id 1 va AFB cua 16 2) dupe nh$n dang thupc 2 ddi tugng nfin se Iam tron khac nhau, dan dfin 16 sau lam tran khdng cd su phii hgp (trimg nhau) d khu vye tiep bien.
- Dang dudng: moi Polyline la mgt doi tugng dugc chia tdch d khu vyc giao nhau, Id 1 va 2 tren hinh 3.4 neu d dang dudng se gdm 3 ddi tugng: Polylme 1 (ACB), Polylme 2 (ADB) va Polyline 3 (AEB ho|c AFB dupc quan Iy Id 1 doi tugng). Nhu vay khi Iam tron, khu vuc tifip gidp giiia 2 Id (AEB ciia Id 1 va AFB eiia Id 2) dupc nhan d ^ g Id 1 doi tugng nfin duong bao 16 sau Iam tron trimg nhau d khu vuc tiep bifin.
Do dd, tac gid nhdn thdy csin phdi ehuydn Idp Id dang vung thanh ldp Id dang dudng sau dd lam tron ldp 16 dang dudng tao ra vd chuyen lai thdnh dang viing dfi sii dyng.
Hinh 3.4. Cdch qudn ly dit lif u dang viing vd dgng ducmg trin phan mem ArcGIS 44 TAP CHI KHOA HQC VA CONG NGHE LAM NGHIfP SO 2-2015
. Qudn ly tdi nguyen rirng & Moi tru&ng Dfi chuyfin ldp ranh gidi Id sau gidi doan tu dang vimg thanh dang duang trfin phdn mfim ArcGIS cd the sii dung rapt so eong eu sau:
QTI) Su dyng cdng cy Feature To Line (ArcToobox\Data
Management Tools\Features\Feahire To Line);
QT2) Su dung cdng cu Polygon To Line (ArcToobox\Data
Management Tools\Features\Polygon To Line);
QT3) Sii dyng edng cy Feature Class To Coverage
(ArcToobox\Conversion
TooIsXTo Coverage\Feature Class To Coverage).
Ldp 16 dang dudng tao ra se dupc lam tron bdng:
QT4) Sii dung cdng cu Smooth Lme (ArcToobox\Cartography Tools\Generalization\Smooth Line)
Thuc hifin hfit QT4, duorng bao 16 da dugc lam tron, tuy nhifin ldp ban do nay van d dang duoTig, cdn phdi chuyfin thdnh dang vimg dfi sii dyng. De chuyfin ldp bdn dd dang dudng thanh dang vimg trfin ArcGIS su dyng cdng cy:
Feature To Polygon (QT5) (ATcToobox\Data
Management Tools\Features\Featiire To Polygon) Ket qud thuc hifin dupc minh hga tai hinh 3.5.
Hinh 3.5. Hinh dnh Id rung vd ddt chua cd rimg sau ldm tran bdng to hpp cdc cdng ci} ti'en phan mem ArcGIS
T4.P CHI KHOA HQC VA CONG NGHE LAM NGHIEP SO 2-2015
Quin ly tai nguyen rime & Mol tnrcmg Til hinh 3.5 thiy: vS mjt hinh anh duong Id De danh gia hiSu qua lam trom ducmg 16 sau lam tron da loai bo du<?c hien tugng dfch bang to h((p cac cong cu tren phan mem die so voi duong 16 sau giai doan, duong 16 ArcGIS, tac gia su dung 2 loai sai so: 1) Sai bam sat voi ranh gioi hi^n tr^g tren anh ve so dien tich theo 16; 2) Sai s6 dien tich theo tinh, khong con hien tudrng Ir6ng de hoac ho trang thai. Ket qua dugc tap hgp 6 bang 3.4 va tai khu vuc tiSp giap giua cac 16 rimg. bang 3.5.
Bang 3.4. Sai si dien tich theo lo khi lam trim bang td hfp cong ctf Irln phdn mim ArcGIS TT
1 2 3 4 5 6 7 8 9 10 Tong Sai so
TT 1 2 3 4 5 6 7 8 9 10 11 Tong Sai so
Dien tich 16 giai doan (Y,)(m')
4.418,3 6.112,0 13.233,4 15.985,5 19.679,0 7.303,1 10.842,3 7.759,6 7.628,5 8.141,7 101.103,4
Dien tich lo lam tron b i n g to hop cong cu tren phan mem ArcGIS (,i{%ff) - (m^)
Bang 3.5. Sai so difn tich theo tr^ng thdi khi Idm tran bdng maldir
14 15 16 17 52 60 72 78 82 88
Dien tich trang thai Idlr
txg txb txn txk Ink ng dtr dt2 dti nn Ngoai LN
giai doan (Yi) (m2)
3,90 1.449,90 64,20 10,60 4,20 55,60 0,30 62,80 61,40 1.852,40 4.205,30 7.770,60
Di|n toh9p
r to hffp 1 4.418,3 6.114,2 13.233,9 15.987,1 19.678,5 7.303,7 10.844,7 7.760,7 7.630,5 8.141,5 101.113,1
((Yl-fW)'
cong cu tren ArcGIS tich lam tron bang cong cu trin ArcGIS
(ha) 3,9 1.450,3 64,2 10,6 4,2 55,6 0,3 62,8 61,4 1852 4.205,3 7.770,6
((Yi 0 4,84 0,25 2,56 0,25 0,36 5,76 1,21 4 0,04 94,09 9,4
-f(ri))2 0 0,16 0 0 0 0 0 0 0 0,16 0 0,32 0,03 Nhu vjy, ket hgp cac cong cu tren phjn phuong phap lam tron duong 16 bSng cong cy mem ArcGIS Ai lam tron duong 16 sau giai Smooth Polygon tren phin mSm ArcGIS hoac doan cho ket qua sai so di?n tich theo 16 va sai phuong phdp lam tron duong bao 16 su dung so dien tich theo (rang thai nho hon so voi phdn m6m eCognition.
46 T ; ^ CHi KHOA HQC VA CONG NGHE LAM NGHIEP SO 2-2015
Qudn ly tdi nguyen rirng & Moi tru&ng
TEST METHOD SMOOTHING ROAD OF PLOTS AFTER INTERPRETATION FROM IMAGE SATELLITE
Pham Van Duan, Vu Thi Thin SUMMARY
Remote sensing technology has proven advantages and prospects for forest inventory, especially mapping and monitoring of the quality finest in our country. One of the jobs lost time after interpretation is smooth plots to editw mapping the status of the forest. The article uses some specialized sofiwaFe, nuqi layer after mterpreted from satellite imagery SP0T6 in Quang Thanh commune , Gia Nghia town, Dak Nong province, maps and suppralmg documents... the plots smoothed by three methods: 1) By tool available o i eCognition software; 2) By tool available on ArcGIS software; 3) By combining tools in ArcGIS software. The results show the wrong number ofidentified by the method ofleast squares ofmapping method 3 with the after map interpreted at 9.4 for fOTCst plots and 0.03 at the status forest . These values are smaller than the wrong number when using method 1 (wrong number plot: 665.8; wrong number status of forest: 0.11) or method 2 (wrong number plot:
12.9; wrong number status of forest: 0,06). From the research results have identified the technical steps smoothing plots: 1) Moving map layer after interpretation from regions to lines ; 2) To smoothing lines; 3) Move the line layer after smoothed into region and update the data to use.
Keywords: After interpraation, ArcGIS software, Smooth plot line, SP0T6, State Forest Ngu-ol phdn bi^n
Ngay nh^n bai Ngdy phdn bien Ngdy quylt dinh ddng
PGS.TS. Tran Quang Bdo 18/3/2015
17/4/2015 09/6/2015
48 TAP CHi KHOA HQC VA CONG NGHf LAM NGHIEP SO 2-2015
. Qudn ly tdi nguyen rung & Mdi tnr&ng
IV. KET L U ^
Sii dyng phdn mem eCognition de Iam tron dudng Id sau gidi dodn cho kfit qua khdng tot ve mat dd hga vi dudng Id sau Iam tron khong bam sat vdi hifin trang ciia anh.
- Su dyng cdng cu Smooth Polygon tren phan mfim ArcGIS dfi lam tron dudng 16 sau gidi doan se xuat hifin hifin tupng chdng de vd h o giiia cac Id gdn nhau cd chung dudng bifin.
- Kfit hgp cac cdng cy trfin phdn mfim ArcGIS dfi lam tron dudng Id sau giai doan eho k^t qud sai sd difin tich theo 16 (9,4) va sai sd di$n tich theo trang thai (0,03) nhd hon so vdi vific sii dyng cdng ey cd sdn tren eCognition hoae ArcGIS vd dudng 16 sau lam tran bdm sdt vdi hien trang ciia anh.
- Quy trinh ldm tran dudng bao Id bang td hgp cdng cy trfin phdn mem ArcGIS.
+ Chuyen ldp bdn dd sau gidi dodn tir d^ng vung thanh dang dudng bang mpt trong cac cong cu: Feature To Line ( Q T I ) ; Polygon To Line (QT2) hodc; Feature Class To Coverage (QT3).
+ Ldm mfim ldp bdn dd dang dudng bang cdng cy Smooth Line (QT4)
+ Chuyfin ldp dudng thdnh ldp viing bdng cdng cy Feature To Polygon (QT5) TAI LIEU THAM KHAO
1. Tran Quang Bao, Nguyin Van Thi, Pham Van Duin (2014), ifng dung GIS trong qudn ly tdi nguyen thin nhin, Nha xuat ban Nong n ^ g ) . Ha Ngi.
2. Pham Van Duin, Phung Van Khoa (2013), Thit nghiem phuang phdp xdy dimg ban do kiem ki rimg trong luu vuc tie dnh ve tinh SPOTS, Tap chi Khoa hpc Lam nghiep so 1, nam 2013, trang 2 6 1 9 - 2 6 3 0 .
3. Luciana F. Alves, Simone A. Vieira, Marcos A.
Scaranello, Plinio B. Camargo, Flavio A.M. Santos, Carlos A. Joly, Luiz A. MartineUi (2010). Forest structure and live aboveground biomass variation along an elevalional gradient of tropical Atlantic moist forest (Brazil). Forest Ecology and Management, pp 679-691.
4. R.J. Hall, R.S. Skakun, E.J. Arsenault, B.S. Case (2006), Modeling forest stand structure allnbutes using Landsat ETM+ data: Application to mapping of aboveground biomass and stand volume. Forest Ecology and Management, No 225, pp 378-390.
J. Peter T. Wolter, Philip A. Townsend, Brian P.. Sturtevant (2009), Estimation of forest structural parameters using 5 and 10 meter SPOT- 5 satellite data. Remote Sensing of Environment, No 113, pp 2019-2036.
6. Foody, G.M., Boyd, D.S. and Cutler, M.E.J.
(2003), Predictive relation of tropical forest biomass from Landsat TM data and their transferability between
regions. Remote Sensing of Environment, No 85, pp 463-474.
TAP CHI KHOA HQC VA CONG NGHE LAM NGHIEP SO 2-2015
