Horizon obstruction computed from a digital elevation model
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/11131 |
Resumo: | The objective of this work was to evaluate the accuracy of the horizon obstruction calculation, from a digital elevation model (DEM), at different topographic situations. The material used included an available DEM for the Serra Gaúcha region, RS, Brazil, GPS receivers, a digital camera, wide angle lens, and Idrisi, Arcview/ArcGIS and Solar Analyst softwares. For 16 locations in the study area, hemispherical photographs were acquired and coordinates were collected. Coordinates and DEM were used to calculate the horizon obstruction using the Solar Analyst algorithm. The open sky fraction computed from the DEM and obtained by hemispherical photograph were compared. Determination coefficient was 0.8428, and an average overestimation of 5.53% of the open sky fraction was observed. Errors are mainly attributed to obstruction caused by vegetation, which cannot be identified by the DEM. The horizon obstruction caused by relief in Serra Gaúcha can be computed satisfactorily by the Solar Analyst, from a DEM interpolated from topographical charts at 1:50,000 scale. |
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Horizon obstruction computed from a digital elevation modelObstrução do horizonte calculada a partir de modelo digital de elevaçãosky view factor; topography; GIS; solar radiation; Solar Analyst; vegetationfração aberta do céu; topografia; SIG; radiação solar; Solar Analyst; vegetaçãoThe objective of this work was to evaluate the accuracy of the horizon obstruction calculation, from a digital elevation model (DEM), at different topographic situations. The material used included an available DEM for the Serra Gaúcha region, RS, Brazil, GPS receivers, a digital camera, wide angle lens, and Idrisi, Arcview/ArcGIS and Solar Analyst softwares. For 16 locations in the study area, hemispherical photographs were acquired and coordinates were collected. Coordinates and DEM were used to calculate the horizon obstruction using the Solar Analyst algorithm. The open sky fraction computed from the DEM and obtained by hemispherical photograph were compared. Determination coefficient was 0.8428, and an average overestimation of 5.53% of the open sky fraction was observed. Errors are mainly attributed to obstruction caused by vegetation, which cannot be identified by the DEM. The horizon obstruction caused by relief in Serra Gaúcha can be computed satisfactorily by the Solar Analyst, from a DEM interpolated from topographical charts at 1:50,000 scale.O objetivo deste trabalho foi avaliar a exatidão do cálculo da obstrução do horizonte, a partir de um modelo digital de elevação (MDE), em diferentes situações topográficas. O material utilizado incluiu um MDE disponível para a região da Serra Gaúcha, RS, receptores GPS, câmera digital, lente grande‑angular e os programas Idrisi, Arcview/ArcGIS e Solar Analyst. Foram adquiridas fotografias hemisféricas, e coletadas as coordenadas de 16 locais na área de estudo. As coordenadas e o MDE foram utilizados para calcular a obstrução do horizonte com uso do algoritmo Solar Analyst. Foram comparadas a fração aberta do céu calculada e a obtida pelas fotografias hemisféricas. O coeficiente de determinação foi de 0,8428, tendo-se observado superestimativa média de 5,53% da fração aberta do céu. Os erros são atribuídos principalmente à obstrução pela vegetação, que não pode ser identificada pelo MDE. A obstrução do horizonte, causada pelo relevo na Serra Gaúcha, pode ser calculada satisfatoriamente pelo Solar Analyst, a partir de um MDE interpolado de cartas topográficas na escala 1:50.000.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraWeber, Eliseu JoséFontana, Denise Cybis2012-11-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/11131Pesquisa Agropecuaria Brasileira; v.47, n.9, set. 2012: Número Temático Geotecnologias; 1327-1336Pesquisa Agropecuária Brasileira; v.47, n.9, set. 2012: Número Temático Geotecnologias; 1327-13361678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/11131/7995https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/11131/6558https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/11131/6559info:eu-repo/semantics/openAccess2012-11-13T21:40:09Zoai:ojs.seer.sct.embrapa.br:article/11131Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2012-11-13T21:40:09Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Horizon obstruction computed from a digital elevation model Obstrução do horizonte calculada a partir de modelo digital de elevação |
title |
Horizon obstruction computed from a digital elevation model |
spellingShingle |
Horizon obstruction computed from a digital elevation model Weber, Eliseu José sky view factor; topography; GIS; solar radiation; Solar Analyst; vegetation fração aberta do céu; topografia; SIG; radiação solar; Solar Analyst; vegetação |
title_short |
Horizon obstruction computed from a digital elevation model |
title_full |
Horizon obstruction computed from a digital elevation model |
title_fullStr |
Horizon obstruction computed from a digital elevation model |
title_full_unstemmed |
Horizon obstruction computed from a digital elevation model |
title_sort |
Horizon obstruction computed from a digital elevation model |
author |
Weber, Eliseu José |
author_facet |
Weber, Eliseu José Fontana, Denise Cybis |
author_role |
author |
author2 |
Fontana, Denise Cybis |
author2_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Weber, Eliseu José Fontana, Denise Cybis |
dc.subject.por.fl_str_mv |
sky view factor; topography; GIS; solar radiation; Solar Analyst; vegetation fração aberta do céu; topografia; SIG; radiação solar; Solar Analyst; vegetação |
topic |
sky view factor; topography; GIS; solar radiation; Solar Analyst; vegetation fração aberta do céu; topografia; SIG; radiação solar; Solar Analyst; vegetação |
description |
The objective of this work was to evaluate the accuracy of the horizon obstruction calculation, from a digital elevation model (DEM), at different topographic situations. The material used included an available DEM for the Serra Gaúcha region, RS, Brazil, GPS receivers, a digital camera, wide angle lens, and Idrisi, Arcview/ArcGIS and Solar Analyst softwares. For 16 locations in the study area, hemispherical photographs were acquired and coordinates were collected. Coordinates and DEM were used to calculate the horizon obstruction using the Solar Analyst algorithm. The open sky fraction computed from the DEM and obtained by hemispherical photograph were compared. Determination coefficient was 0.8428, and an average overestimation of 5.53% of the open sky fraction was observed. Errors are mainly attributed to obstruction caused by vegetation, which cannot be identified by the DEM. The horizon obstruction caused by relief in Serra Gaúcha can be computed satisfactorily by the Solar Analyst, from a DEM interpolated from topographical charts at 1:50,000 scale. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-11-09 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/11131 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/11131 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/11131/7995 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/11131/6558 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/11131/6559 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.47, n.9, set. 2012: Número Temático Geotecnologias; 1327-1336 Pesquisa Agropecuária Brasileira; v.47, n.9, set. 2012: Número Temático Geotecnologias; 1327-1336 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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