Using Radiance Ratio as a Proxy for Forest Canopy Surface Roughness

8/20/2019 Using Radiance Ratio as a Proxy for Forest Canopy Surface Roughness

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Wsebf ^ljelbkg ^lteo ls lXroxy aor Aorgst Klbopy

[uralkg ^oufdbgss

@lttdgw @kCebbgyWbevgrsety oa @el`e

Jr. [uslb WstebWbevgrsety oa Klieaorbel Jlves

[dlbg FrefsnyWbevgrsety oa Koiorljo Nouijgr


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E. [uralkg ^oufdbgss

! Zdg vlrelteobs eb dgefdt oa suralkgaglturgs ovgr lb lrgl.

! [uralkg roufdbgss es kobbgktgj toe`portlbt vlrelnigs eb aorgst gkoiofy,sukd ls pdotosybtdgtek gaaekegbky lbjdlnetlt typgs.

! ^giltgj to tdg `gtgoroiofekli vlrelnigkliigj roufdbgss igbftd.

©ZdorIlns


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\ulbteayebf [uralkgôufdbgss

!

[dljg arlkteob klb ng usgj ls l proxy to `glsurgsuralkg roufdbgss.

Aefurg < aro` @usdceb & Feiigspeg >887

L roufd suralkgeiiuèbltgj ny subiefdtweii klst òrg sdljowstdlb l sòotd suralkg.

Zdg lòubt oa vesenig

sdljow kdlbfgsjgpgbjebf ob tdg vegwlbfig.

Zdes klb ng usgj to

gste`ltg suralkg roufdbgss.


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Klikuiltg ^ljelbkg ^lteo

Zdg gqulteob rgjukgs to l rlteo oarljelbkg (I) ls l aubkteob oa sgbsoror sub lbfig.

^^

l<

l> ¹

< a sd lø Ò

Zdes rlteo klb liso ng gxprgssgjwetd l rlteo oa sdljg arlkteob ( a sd)

ls l aubkteob oa sgbsor or sublbfig.

^^ l<l>

¹ I

lø Ò

¹<p E soi ò [ ,

^g < a sd lø Ò.

^^ Zl<l>

¹ s

lø Ò

^^ l<l>

@uitepiyebf ^^ ny tdg rlteo oaltòspdgrek trlbsèssevety (ϊ)

aro` notd lbfigs fevgs lb lnsoiutg^^.

;.

•

@usdceb lbj Feiigspeg uteiezgj l rgiltevgiy se`pig rlteo to lpproxe`ltg suralkgroufdbgss, kliigj tdg ^ljelbkg ^lteo, or ^^.

•

Zdes rlteo kouij ng usgj wetdout ltòspdgrek korrgkteob, eb wdekd klsg et wouijobiy ng lb gste`lteob oa rgiltevg roufdbgss.


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EE. @gtdojs

!

Klikuiltebf ^^ rgquergs rljelbkg jltl oa tdg sl`gioklteob aro` two vegw lbfigs (sub lbfigs) wdeig

tdg sub lbfig (vegw lbfig) es kobstlbt.

!

Aor tdes promgkt, tdg rljelbkg jltl wgrg tlcgb aro`

@L[ZG^ aiefdt iebgs > lbj ; ob Mubg >:td

, >8


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@L[ZG^ ^ljelbkg Jltl

! Xexgi [ezg= 7` ny 7`

! Wbets= V/`>/sr/!` (spgktrli rljelbkg)

! Kovgrgj wlvgigbftds aro` :18b` to ,678b` (QE[ to E^).

! Kdosg nlbj ; (778b`) to klikuiltg ^^.

! ^giltevg ^^0Iiebg>/Iiebg;


7/32

Lt`ospdgrekZrlbs`essevety

! Klikuiltgj wetd @OJZ^LB ls l aubkteob oa sgbsorzgbetd lbfig aor iebgs > lbj ;.

! Zlcg tlu rlteo= Z^0ϊ(μiebg>)/ϊ(μiebg;)

!

@uitepiy to ^^= ^^*0Z^*^^

! Fevgs ^^*, or lnsoiutg ^^


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Vdlt jogs ^^ `glb?

!

Otdgr vlrelnigs lrg bggjgj to ko`plrg lflebst tdgklikuiltgj ^^ vliugs. L ̀ uitepig iebglr rgfrgsseob esrgquergj.

!

Zdg sgbsor zgbetd lbfig aor iebgs > lbj ; es ebkiujgjaerst, ls et klb ebaiugbkg rgljebfs jergktiy.

!

Zdg otdgr vlrelnigs rgprgsgbt jeaagrgbtkdlrlktgresteks oa roufdbgss.


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[iopg

!

Klikuiltgj aro` @L[ZG^ gigvlteob lrrly usebf@ltiln ’frljegbt`‐ aubkteob.

!

[iopg Wbets= Jgfrggs Wp aro` Dorezobtli.

!

Xrovejgs ebaor`lteob ob tdg sdlpg oa tdg ilbj.


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Iokli ^ljelbkg ^lbfg lbj [tlbjlrjJgvelteob

!

Zdg iokli (;x;) rlbfg lbj stlbjlrj jgvelteob oarljelbkg vliugs aro` nlbj ; oa @L[ZG^ iebg >.

!

Wbets= V/`>/sr/!`

!

Xrovejg l proxy aor tdg iokli gbtropy oa tdg rljelbkgjltl.


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Xrebkepig Ko`pobgbtLingjo

!

Klikuiltgj eb GBQE aro` @L[ZG^ iebg > rljelbkgjltl.

!

Wbets= Bobg

!

Xrovejgs ebaor`lteob ob jeaagrgbt suralkg typgs lbjtdger jestrenuteob.


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IeJL^ ^gturb Bu`ngr@gtrek

!

@gtrek rgiltebf BGOB IeJL^ outfoebf puisgs toebko`ebf puisgs.

!

^B@0lns(ib(pexgisu`(rgtbu`/bu`rgts)/bu`poebts))

• Ilrfgr vliugs `glb `orgsuralkg errgfuilretegs tdlt

spiet IeJL^ puisgs.

• Xrovejgs lbotdgr proxy aorsuralkg errgfuilretegs.


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IeJL^ Gigvlteob Qlrelbkg

!

Klikuiltgj aro` IeJL^ gigvlteob jltl.

!

Wbets= @gtgrs

!

Xrovejgs ebaor`lteob ob tdg tgrrleb strukturg lbjerrgfuilretegs.


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[e`pig ^lteo ILE

!

Klikuiltgj ls l rlteo oa @L[ZG^ nlbj


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Qgfgtlteob Dgefdt

!

Klikuiltgj aro` tdg sl`g J[@ lbj JZ@ aeigs lsvgfgtlteob jgbsety.

!

Wbets= @gtgrs

!

Xrovejgs ebaor`lteob ob klbopy strukturg lbjjestrenuteob.


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Qgfgtlteob Jgbsety

!

Klikuiltgj aro` tdg vgfgtlteob dgefdt lrrly, trgltebfpexgis wetd dgefdt 28 ls ’pilbts/trggs.‐

!

^gprgsgbts tdg bu`ngr oa pilbts/trggs wetdeb l >8`rljeus oa glkd pexgi.

!

Xrovejgs ebaor`lteob ob klbopy strukturg lbjjestrenuteob.


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EEE. Korrgilteob?

!

Zdg klikuiltgj ^^* wls rgfrgssgj lflebst tdgsgvlrelnigs usebf tdg ’rgfrgss‐ aubkteob eb @ltiln.

!

Zdg ngst ^> vliug lkdegvgj wls 8.>5>>wdgb outiegrs lrg gxkiujgj).

!

Zdes es vgry iow, kobsejgrebf tdg bu`ngr oavlrelnigs ebkiujgj.


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EQ. Kobkiuseobs

! Zdg vlrelnigs tdlt kobtrenutgj `ost to tdg iebglr rgfrgsseobwgrg tdg vgfgtlteob jgbsety, iokli rljelbkg rlbfg, lbj se`pigrlteo ILE. Zdgsg lrg lii kobbgktgj to klbopy strukturg, wdekdsdows pro`esg aor ^^* ls l proxy aor klbopy roufdbgss.

! Zdg iow ^> e`piegs tdlt tdgrg lrg otdgr vlrelnigs kobtrenutebfsefbeaeklbtiy to ^^*, wdekd wgrg bot ebkiujgj eb tdg lbliyses.

! Zdgsg vlrelnigs `ly bot ng rgiltgj to strukturg ls ebtuetevgiy lstdg obgs ebkiujgj dgrg.


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Q. Lkcbowigjfg`gbts

! Jr. [uslb Wsteb

! [dlbg Frefsny

! [glb Argg`lb

! Jr. G`eiy [kdliigr

! Ilbj Froup


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\ugsteobs?

d L d


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Zlstg tdg Lt`ospdgrekKorrgkteob


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GBQE @lscebf

!

@lscgj fgofrlpdek ioocup tlnigs eb GBQE to esoiltgtdg ovgrilp ngtwggb > @L[ZG^ iebgs.

!

+ 0

!

Zdg ovgrilppgj lrgl klb bow ng puiigj out wetdlbotdgr `lsc.

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Using Radiance Ratio as a Proxy for Forest Canopy Surface Roughness