| 1. Identity statement | |
| Reference Type | Journal Article |
| Site | mtc-m12.sid.inpe.br |
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identifier | 6qtX3pFwXQZ3r59YD6/GPb4e |
| Repository | sid.inpe.br/iris@1912/2005/07.20.05.35 |
| Last Update | 2011:08.31.14.40.39 (UTC) marciana |
| Metadata Repository | sid.inpe.br/iris@1912/2005/07.20.05.35.40 |
| Metadata Last Update | 2018:06.05.00.52.39 (UTC) administrator |
| Secondary Key | INPE-9065-PRE/4741 |
| DOI | 10.2307/2269350 |
| ISSN | 1051-0761 |
| Label | 6146 |
| Citation Key | HallShimHuem:1995:ReSeFo |
| Title | Remote sensing of forest biophysical structure using mixture de composition and geometric reflectance models  |
| Year | 1995 |
| Month | Nov. |
| Access Date | 2024, May 18 |
| Type of Work | journal article |
| Secondary Type | PRE PI |
| Number of Files | 1 |
| Size | 3086 KiB |
| 2. Context | |
| Author | 1 Hall, F. G. 2 Shimabukuro, Yosio Edemir 3 Huemmrich, K. F |
| Resume Identifier | 1 2 8JMKD3MGP5W/3C9JJCQ |
| Group | 1 2 DSR-INPE-MCT-BR |
| Affiliation | 1 Goddard Space Flight Ctr, Greenbelt, MD 20771, United States 2 3 GODDARD SPACE FLIGHT CTR, GREENBELT |
| Journal | Ecological Applications |
| Volume | 5 |
| Number | 4 |
| Pages | 993-1013 |
| History (UTC) | 2005-07-20 05:35:41 :: administrator -> jefferson :: 2007-10-10 19:29:35 :: jefferson -> administrator :: 2008-06-09 19:16:15 :: administrator -> jefferson :: 2010-07-07 18:51:45 :: jefferson -> marciana :: 2011-12-05 12:09:16 :: marciana -> administrator :: 1995 2016-06-04 23:29:31 :: administrator -> marciana :: 1995 2016-09-09 18:48:38 :: marciana -> administrator :: 1995 2018-06-05 00:52:39 :: administrator -> marciana :: 1995 |
| 3. Content and structure | |
| Is the master or a copy? | is the master |
| Content Stage | completed |
| Transferable | 1 |
| Content Type | External Contribution |
| Version Type | publisher |
| Keywords | LEAF AREA INDEX RED-INFRARED SCATTERGRAMS CANOPY REFLECTA VEGETATION PARAMETERS LEAVES |
| Abstract | Using geometric shadow and linear mixture models we develop and evaluate an algorithm to infer several important structural parameters of stands of black spruce (Picea mariana), the most common boreal forest dominant. We show, first, that stand eflectances for this species can be represented as linear combinations of the reflectances of more elemental radiometric components: sunlit crowns, sunlit background, and shadow. Secondly, using a geometric model, we calculate how the fractions of these radiometric elements covary with each other. Then, using hand-held measurements of the reflectances of the sunlit background, sphagnum moss (Sphagnum spp.), and assuming shadow reflectance to be that of deep, clear lakes, we infer the reflectance of sunlit crowns from the geometric shadow model and low-altitude reflectance measurements acquired by a helicopter-mounted radiometer. Next, we assume that the reflectance for all black spruce stands is simply a linear combination of shadow, sunlit crown, and sunlit background reflectance, weighted in proportion to the relative areal fractions of these pixel elements. We then solve a set of Linear equations for the areal fractions of these elements using as input helicopter observations of total stand reflectance. Using this algorithm, we infer the values for the areal proportions of sunlit canopy, sunlit background, and shadow for 31 black spruce stands of varying biomass density, net primary productivity, etc. We show empirically and theoretically that the areal proportions of these radiometric elements are related to a number of stand biophysical characteristics. Specifically, the shadow fraction is increasing with increasing biomass density, average diameter at breast height, leaf area index (LAI), and aboveground net primary productivity (NPP), while sunlit background fraction is decreasing. We show that the end member fractions can be used to estimate biomass with a standard error of approximate to 2 kg/m(2), LAT with a standard error of 0.58, dbh with a standard error of approximate to 2 cm, and aboveground NPP with a standard error of 0.07 kg . m(-2). yr(-1). We. also show that the fraction of sunlit canopy is only weakly correlated with the biophysical variables and are thus able to show why a popular vegetation index, Normalized Difference Vegetation Index (NDVI), does not provide a useful measure of these biophysical characteristics. We do show, however, that NDVI should be related to the fraction of photosynthetically active radiation incident upon and absorbed by the canopy. This work has convinced us that a paradigm shift in the remote sensing of biophysical characteristics is in order-a shift away from direct inference of biophysical characteristics from vegetation indices and toward a two-step process, in which (1)stand-level reflectance is approximated in terms of linear combinations of reflectance-invariant, spectrally distinct components (spectral end members)and mixture decomposition used to infer the areal fractions of these components, e.g., shadow, sunlit crown, and sunlit background, followed by (2)the use of radiative transfer models to compute biophysical characteristic values as a function of the end member fractions. |
| Area | SRE |
| Arrangement | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSR > Remote sensing of... |
| doc Directory Content | access |
| source Directory Content | there are no files |
| agreement Directory Content | there are no files |
| 4. Conditions of access and use | |
| data URL | http://urlib.net/ibi/6qtX3pFwXQZ3r59YD6/GPb4e |
| zipped data URL | http://urlib.net/zip/6qtX3pFwXQZ3r59YD6/GPb4e |
| Language | en |
| Target File | 2269350.pdf |
| User Group | administrator jefferson marciana |
| Reader Group | administrator marciana |
| Visibility | shown |
| Copy Holder | SID/SCD |
| Archiving Policy | allowpublisher allowfinaldraft |
| Read Permission | allow from all |
| Update Permission | not transferred |
| 5. Allied materials | |
| Next Higher Units | 8JMKD3MGPCW/3ER446E |
| Dissemination | WEBSCI; PORTALCAPES. |
| Host Collection | sid.inpe.br/banon/2001/04.06.10.52 |
| 6. Notes | |
| Empty Fields | alternatejournal archivist callnumber copyright creatorhistory descriptionlevel e-mailaddress electronicmailaddress format isbn lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project rightsholder schedulinginformation secondarydate secondarymark session shorttitle sponsor subject tertiarymark tertiarytype url |
| 7. Description control | |
| e-Mail (login) | marciana |
| update | |