L Nha chung cu kieu C O/ M6i dien tfch: m^
achpn 3 bnd d xii 1^ thnh phdn chfnh (PCA) v mdt bnd SAVI, dd chfnh xc dt td
J,20%. Dat dd chinh xac nhu vdy khdng nhCng do su lua chon lai cac band tham gia phdn
ai ma cdn bi anh hudng bdi cac mdu da chon.
Avings5(9pat^ 1.^96051?^ HnminSepafaiSE^ 0.910^7: Mamm Scpafibiy. ZQOQOOQ rgia^pair'wlh *""-^ /
MralmSeparab^^ {LuaxarKnha nong th
- ^^^..^^^.r.r^-5^^1^;-.-.^^;^ .tJi/^r.^;--..--.-^- -
^•..
• ' • - . - < ;
^p.:,ic;;-;a^ J^. Name llua Nuoc bong
Nuocbong | 2000000 | Luaxar^ | 1.626338 | 1.999917 Luadalbon | 1.749138 I 1.339398 rhanongho | 1.772077
Nuoc due hon | 1.997545 Duong | 1.294858 datdotN 1 1.908097 2000000 1.803266 2000000 2000000 Lua xanh 1.803884 Q910897 1.333290 1.984775 1.751G91 Luadalbon 1.807724 1990060 1.993319 1.390747 rhanongh) 1.976698 1.996629 1.936880
Nuoc dje hon
1.999646 1.872533 1.872533
Duong
1
ti93B74 1
Hinh 1. Khd ndng phdn biet giua cdc mdu khi chpn 3 band gdc vd mot band SAVI
Bhatochaiya Distance Tfantfoimed Divergence
.i^.••v;y•..7 a r Sated Lid l - . v t':' SepaiafcltyMAMua: T'ansfofmedDivetgence AvnageSepiabtl/. 1.952114 M n t n j i a S e f M i a b i ( y : U O ^ ' , . '..v- — MamuaSepvabity:2000000 ''. ^•-• Signature paiiMh
Mirinun SeparabA/ (lua sanKnha rang thonl
•M
^'i:^ -'-- ^
ifj:
Ii_,jj^»H,on Irhinorqfho [Nuocduchon |Ou>ng
Lua xanh 1.931784 2000000
Lua dai bon 1.980294 2000000 — 1.^ 1962308 rfanaiglho | 1998728 NuocdLchon I 1.399533 Duong 1.730406 dat doth 1999518 2000000 1.1W581 1.339621 2000000 V383226 1971723 1.398649 1.997236 2000000 1.999985 1993971 2000000 1953866 2000000 19B4663 1937453 1.999632
Hinh 2. Khd ndng phdn biet giila cdc mdu khi chpn 3 band PCA vd mot band SAVI
Xet theo dudng cheo cua ma tran sai lln, do chinh xac phan loai cua cac Idp theo m5u chon the hien nhu sau: Dd chinh xac cua cac Idp nudc trong, lua xanh, nudc due va dat dd deu tang Nudc trong tang tu 98,54% len 99,78%, lua xanh tang tu 72,75% len 95,38%, dc due tir 94 37% len 94,65%, dat do thi tu 96,20% len 97,47%. Dac biet do chinh xac tang inh nhd't la lua xanh. Xet theo hang ngang cua ma tran sai lan, lua xanh, sau khi ph^n loai 1 mdt bi Idn nhiau vdi nha ndng thon (23,84%). Do chinh xac nay da tang len dang ke sau i thuc hien phan loai lan hai.
Xet cac band goc ciia Landsat tham gia phan loa.. tang so luang band tham gia phan loai se .g do chfnh xac tu 69,9% len 87,75% (bang 1). Tuy vay, so luang band tham gia phan loai se 5ng quyet dinh hoan toan tdi do chinh xac phan loai vl neu sap xep dp chinh xac phan loai theo luang band! chung toi thay rang 4 band cua truang hap 5 co do chinh xac cao nhat, dac biet