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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Using Unmanned Aerial Vehicles and Carbon Assimilation Rate Measurements to Estimate Carbon Capture for Red Sea Mangroves

Lara, Mariana Elias 04 1900 (has links)
To meet ambitious net-zero greenhouse gas emission targets by 2050, large-scale CO₂ reduction and removal are required. Nature-based solutions have been proposed as a potential aid to this process. Mangrove ecosystems, as well as their conservation and restoration, have the potential to make significant contributions in Saudi Arabia and other coastal regions. While field measurements of carbon assimilation rate and leaf area index (LAI) in mangroves provide important insights into carbon fluxes, they are time-consuming, labor-intensive, and limited when covering large areas. To address this issue, multispectral images captured by unmanned aerial vehicles (UAV) are used to generate spectral vegetation indices, which can then be used to build regression models for estimating mangrove LAI and carbon capture capabilities. The carbon assimilation rate measurements in the field for studying both diurnal and sub-seasonal fluxes revealed that Avicennia marina has a high carbon assimilation rate peak in the morning, which decreases thereafter, and a smaller peak in the afternoon. Furthermore, comparing all the studied sites, the KAM site (June) had the highest morning overall carbon assimilation rate values, ranging from 15- 20 μmol CO₂ m⁻² s⁻¹, followed by Island (October) ranging from 10- 17 μmol CO₂ m⁻² s⁻¹, and finally Rheem (February) ranging from 5- 15 μmol CO₂ m⁻² s⁻¹. Moreover, the acquired multispectral images were used to generate spectral vegetation indices, which were then used as input to build a random forest algorithm for estimating the LAI of mangroves. Following an evaluation of each mangrove site, the Rheem site dataset yielded the best Random forest algorithm (R²= 0.88 and RMSE= 0.39), so this model was used to create high resolution spatially distributed LAI-based maps for all of the mangrove sites studied. Knowing the carbon uptake per leaf area as well as the total leaf area (based on UAV-derived LAI estimates) within a mangrove site enabled us to create carbon capture maps (kg C yr⁻¹ per pixel) for all of the sites studied. To enable a more complete carbon accounting of mangrove ecosystems, future research should explore remote sensing approaches for inferring carbon assimilation in both belowground biomass and soils.
22

Predicting Crop Yield Using Crop Models and High-Resolution Remote Sensing Technologies

Ziliani, Matteo Giuseppe 01 1900 (has links)
By 2050, food consumption and agricultural water use will increase as a result of a global population that is projected to reach 9 billion people. To address this food and water security challenge, there has been increased attention towards the concept of sustainable agriculture, which has a broad aim of securing food and water resources while preserving the environment for future generations. An element of this is the use of precision agriculture, which is designed to provide the right inputs, at the right time and in the right place. In order to optimize nutrient application, water intakes, and the profitability of agricultural areas, it is necessary to improve our understating and predictability of agricultural systems at high spatio-temporal scales. The underlying goal of the research presented herein is to advance the monitoring of croplands and crop yield through high-resolution satellite data. In addressing this, we explore the utility of daily CubeSat imagery to produce the highest spatial resolution (3 m) estimates of leaf area index and crop water use ever retrieved from space, providing an enhanced capacity to provide new insights into precision agriculture. The novel insights on crop health and conditions derived from CubeSat data are combined with the predictive ability of crop models, with the aim of improving crop yield predictions. To explore the latter, a sensitivity analysis-linked Bayesian inference framework was developed, offering a tool for calibrating crop models while simultaneously quantifying the uncertainty in input parameters. The effect of integrating higher spatio-temporal resolution data in crop models was tested by developing an approach that assimilates CubeSat imagery into a crop model for early season yield prediction at the within-field scale. In addition to satellite data, the utility of even higher spatial resolution products from unmanned aerial vehicles was also examined in the last section of the thesis, where future research avenues are outlined. Here, an assessment of crop height is presented, which is linked to field biomass through the use of structure from motion techniques. These results offer further insights into small-scale field variabilities from an on-demand basis, and represent the cutting-edge of precision agricultural advances.
23

Achieving improved leaf area index estimations from digital hemispherical imagery through destructive sampling methods

Condon, Timothy 05 July 2019 (has links)
Destructive sampling of 20 trees of four tree species in a mixed New England conifer/hardwood stand shows that leaf area comprises 72, 77, and 78 percent of plant area as measured with digital hemispherical photography of the stand in (1) leaf-off, (2) leaf-out and pre-harvest, and (3) leaf-out and post-harvest conditions. Leaf area index values for the stand, estimated through destructive sampling, were 4.42, 5.98, and 5.08 respectively, documenting the progression of leaf growth through post-harvest. Terrestrial lidar scans (TLS) of the stand in (1) leaf-off and (2) leaf-out and pre-harvest conditions provided leaf area index values of 4.49 and 6.00 using the correction applied to observed plant area index, showing good agreement. The method relies on destructive sampling to relate the weight of foliage removed from sample trees to leaf area and fine twig area within the foliage as measured by a flatbed scanner. Two conifer species, eastern hemlock and white pine, and two deciduous species, red maple and red oak, in five diameter-size classes, were harvested from the 50 x 50-m stand in late summer. Leaf and twig areas of these trees provided species-specific allometric equations relating stem basal area to leaf and twig area, and a stand map provided species, counts and diameters of all trees in the plot. These data then allowed estimation of the leaf area of the stand as a whole for comparison with optical methods. The ratios of leaf to fine-branch area for each species vary, with values of 5.33, 25.38, 260.88 and 140.35 for eastern hemlock, white pine, red maple, and red oak respectively. This variance shows that woody-to-total area constants, which are used for calculating leaf area index from plant area index values determined by optical gap probability methods, will be quite dependent on stand composition and questions the common usage of literature constants for this purpose. This study shows how destructive sampling can lead to better estimation of forest leaf area index and wood area index from hemispherical photography and terrestrial lidar scanning, which has the potential to improve modeling of nutrient cycling and carbon balance in ecosystem models.
24

Sensorimotor Integration Following Training on a Tactile Discrimination Maze Task

Pickersgill, Jake 11 1900 (has links)
Sensorimotor integration refers to the process of combining incoming sensory information with outgoing motor commands to control movement. Short-Latency Afferent Inhibition (SAI), Long-Latency Afferent Inhibition (LAI) and Afferent Facilitation (AF) are three neurophysiological measures collected using Transcranial Magnetic Stimulation (TMS) to assess sensorimotor integration in humans. No studies to date have investigated the influence of tactile discrimination training on these measures. This study aimed to determine whether SAI, LAI, and AF are modulated following training on a custom-designed sensorimotor task which required participants to use their sense of touch to successfully navigate 3D printed maze with interchangeable paths. The maze training was separated into “high difficulty” and “low difficult” conditions which reflected the tactile challenge embedded within the maze. On an additional visit, no maze training was performed to serve as a control condition. Despite evidence of performance improvements during training, there were no significant changes in SAI, LAI or AF following training in either condition. Further, there was no correlation between the % change in SAI/LAI and improvements in total dwell time on the maze. As the functional significance of these measures is still unclear, these findings suggest that changes in SAI, LAI or AF may not be a valid metric to measure meaningful or functional changes related to skills or performance improvements induced by training. / Thesis / Master of Science in Kinesiology / Sensorimotor integration refers to the combination of incoming sensory information with outgoing motor commands in the nervous system to control movement. Short- Latency Afferent Inhibition, Long-Latency Afferent Inhibition and Afferent Facilitation are three measures that probe sensorimotor integration in humans using Transcranial Magnetic Stimulation. Although these measures have been well studied in both healthy and clinical populations in a variety of contexts, the influence of sensorimotor training on these measures remains unclear. This thesis aimed to determine if SAI, LAI and AF change following training on a novel tactile discrimination maze task. Further, the relationship between changes in sensorimotor integration and improvements in maze performance was explored. SAI, LAI and AF were not shown to be influenced by training, and there was no association between the changes in these measures and improvements in maze performance.
25

The discrete wavelet transform as a precursor to leaf area index estimation and species classification using airborne hyperspectral data

Banskota, Asim 09 September 2011 (has links)
The need for an efficient dimensionality reduction technique has remained a critical challenge for effective analysis of hyperspectral data for vegetation applications. Discrete wavelet transform (DWT), through multiresolution analysis, offers oppurtunities both to reduce dimension and convey information at multiple spectral scales. In this study, we investigated the utility of the Haar DWT for AVIRIS hyperspectral data analysis in three different applications (1) classification of three pine species (Pinus spp.), (2) estimation of leaf area index (LAI) using an empirically-based model, and (3) estimation of LAI using a physically-based model. For pine species classification, different sets of Haar wavelet features were compared to each other and to calibrated radiance. The Haar coefficients selected by stepwise discriminant analysis provided better classification accuracy (74.2%) than the original radiance (66.7%). For empirically-based LAI estimation, the models using the Haar coefficients explained the most variance in observed LAI for both deciduous plots (cross validation R² (CV-R²) = 0.79 for wavelet features vs. CV-R² = 0.69 for spectral bands) and all plots combined (CV R² = 0.71 for wavelet features vs. CV-R² = 0.50 for spectral bands). For physically-based LAI estimation, a look-up-table (LUT) was constructed by a radiative transfer model, DART, using a three-stage approach developed in this study. The approach involved comparison between preliminary LUT reflectances and image spectra to find the optimal set of parameter combinations and input increments. The LUT-based inversion was performed with three different datasets, the original reflectance bands, the full set of the wavelet extracted features, and the two wavelet subsets containing 99.99% and 99.0% of the cumulative energy of the original signal. The energy subset containing 99.99% of the cumulative signal energy provided better estimates of LAI (RMSE = 0.46, R² = 0.77) than the original spectral bands (RMSE = 0.69, R² = 0.42). This study has demonstrated that the application of the discrete wavelet transform can provide more accurate species discrimination within the same genus than the original hyperspectral bands and can improve the accuracy of LAI estimates from both empirically- and physically-based models. / Ph. D.
26

The role of radio and TV in the life of ethnic minorities in Vietnam : case study : the H'mong people in Lao Cai and Lai Chau province /

Nguyen, Thuy Thi Thu. January 2008 (has links) (PDF)
Master's thesis. / Format: PDF. Bibl.
27

LEI DE ACESSO À INFORMAÇÃO: um canal à fonte de notícia / Access information law: a medium to the news source

SOUZA, ROSE MARA VIDAL DE 18 August 2016 (has links)
Submitted by Noeme Timbo (noeme.timbo@metodista.br) on 2017-01-20T13:45:24Z No. of bitstreams: 4 RoseMaraSouza_Parte1.pdf: 2076122 bytes, checksum: 7d1b58d85a9cef7da1edcfd9ba35a8f3 (MD5) RoseMaraSouza_Parte2.pdf: 1765563 bytes, checksum: e25b1943b208e5ef36cd6cc996e75201 (MD5) RoseMaraSouza_Parte3.pdf: 2537069 bytes, checksum: 2c3cae706ee56a5533890ae76737b533 (MD5) RoseMaraSouza_Parte4.pdf: 146984 bytes, checksum: 5f71597a08654706187af6f15be6abe9 (MD5) / Made available in DSpace on 2017-01-20T13:45:24Z (GMT). No. of bitstreams: 4 RoseMaraSouza_Parte1.pdf: 2076122 bytes, checksum: 7d1b58d85a9cef7da1edcfd9ba35a8f3 (MD5) RoseMaraSouza_Parte2.pdf: 1765563 bytes, checksum: e25b1943b208e5ef36cd6cc996e75201 (MD5) RoseMaraSouza_Parte3.pdf: 2537069 bytes, checksum: 2c3cae706ee56a5533890ae76737b533 (MD5) RoseMaraSouza_Parte4.pdf: 146984 bytes, checksum: 5f71597a08654706187af6f15be6abe9 (MD5) Previous issue date: 2016-08-18 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / This study aims to verify that the Access to Information Act is a channel for news source for journalists. The research was guided by exploratory study of quantitative and qualitative nature, delineated by bibliographical research, documentary, structured interviews and content analysis. At first an overview of LAI was presented in the five continents of the globe and which countries have and do not have the rules of access to information. Later there were two mappings: The first was about the requests made by journalists (in general) in the Electronic System of Citizen Information Services (e-SIC) of the Comptroller General of the Union (CGU) in 2014 and 2015. The second mapping was directed to articles published in the newspaper Folha de S. Paulo, the policy of publishing in 2014 and 2015. Among the documents used is the 2nd performance Report Access Law to public information of the Brazilian Association of Investigative Journalism (ABRAJI) who interviewed 83 Brazilian journalists on LAI in 2015. from a theoretical point of view, the survey runs through democracy (Bobbio), the public communication concepts (Brandao), the right to public information (Mendel), data journalism (Machado), news sources (Lage / Charaudeau ) and hacker culture (Coleman), among others. The analysis showed that the LAI is used as a channel to the news source within the policy coverage, but with still low use by journalists. The survey also revealed that there are also no incentive mechanisms to use and measurement criteria on LAI as a channel to the news source, both by the federal government, as the National Federation of Journalists (FENAJ). / Este estudo visa verificar se a Lei de Acesso à Informação é um canal para obter fonte de notícia para jornalistas. A pesquisa foi norteada por estudo exploratório, de natureza quanti-qualitativa, delineado por pesquisa bibliográfica, documental, entrevistas estruturadas e análise de conteúdo. Em um primeiro momento foi apresentado um panorama da LAI nos cinco continentes do globo e quais países possuem e não possuem a legislação de acesso à informação. Posteriormente foram realizados dois mapeamentos: O primeiro foi acerca das solicitações feitas por jornalistas (em geral) no Sistema Eletrônico do Serviço de Informações ao Cidadão (e-SIC) da Controladoria-Geral da União (CGU) em 2014 e 2015. O segundo mapeamento foi dirigido às matérias publicadas no jornal Folha de S. Paulo, na editoria de política, em 2014 e 2015. Entre os documentos utilizados está o 2º Relatório de desempenho da Lei de Acesso a informações públicas da Associação Brasileira de Jornalismo Investigativo (ABRAJI), que entrevistou 83 jornalistas brasileiros sobre a LAI em 2015. Do ponto de vista teórico, a pesquisa perpassa os conceitos de democracia (Bobbio), comunicação pública (Brandão), direito à informação pública (Mendel), jornalismo de dados (Machado), fontes de notícias (Lage/Charaudeau) e cultura hacker (Coleman), entre outros. A análise mostrou que a LAI é utilizada como canal à fonte de notícia no âmbito da cobertura política, porém com baixo aproveitamento pelos jornalistas. A pesquisa ainda revelou que tampouco existem mecanismos de estímulo ao uso e critérios de mensuração sobre a LAI como canal à fonte de notícia, tanto pelo Governo Federal, quanto pela Federação Nacional dos Jornalistas (FENAJ).
28

Diploma de monge: um estudo sobre a Universidade Livre Budista da Fo Guang Shan / Monk´s Diploma: a study about Universidade Livre Budista of Fo Guang Shan

Souza, Denise Lopes de 23 June 2006 (has links)
Made available in DSpace on 2016-04-25T19:20:41Z (GMT). No. of bitstreams: 1 Dissertacao DENISE LOPES DE SOUZA.pdf: 733208 bytes, checksum: 2e99bcae42783b794be649d88860ac11 (MD5) Previous issue date: 2006-06-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This work aims to describe and analyse the course for monks and Dharma s teachers offered by the Universidade Livre Budista of the Zu Lai temple located in Cotia Data was obtained through interviews and observations which means the research assumes an empirical characteristic Bibliographic material was also a source of information The Zu Lai temple is a Brazilian branch of the Fo Guang Shan organization whose headquarters is in Taiwan Its objectives are to spread Dharma through culture develop talents through education benefit society through charity and purify the mind through spiritual development The founder of the organization Hsing Yün tries to spread the so called Humanistic Buddhism which has an anthropocentric characteristic and intends to emphasize the pragmatism of Buddhism Along the course students of the Universidade Livre Budista are expected to reach spiritual development through study of religion Furthermore they are expected to learn how to use Buddha´s teachings in order to benefit the environment they belong to The pragmatic characteristic emphasized in the subjects taught during the course are similar to what Ken Jones calls Socially Engaged Buddhism which is known as the need for buddhists to gather and work to promote ethical and pragmatic Buddhism focused on social benefit This work contributes to the discussion about the settlement of Fo Guang Shan in Brazil through the use of educational characteristics inherent to Buddhism Besides that it contributes to the discussion about the social role the course represents not only to the local community but also to the Chinese people and their descendants by considering the substance of the offer the inter-relation between the religious organization and society and the organizational competence of the temple The discussion is based on the theory of the sociologist Rodney Stark and mainly concludes that the strictness of the monastic rules students are supposed to obey as well as the limited validity of the diploma issued by the organization contribute to the number of students who give up the course which is significant / Este trabalho tem como objetivo descrever e analisar o curso de formação de monges e professores de Dharma da Universidade Livre Budista do Templo Zu Lai situado em Cotia A coleta de dados foi feita por meio de entrevistas e observações determinando seu caráter empírico bem como de material bibliográfico de fontes primárias e secundárias O Templo Zu Lai é a filial brasileira da organização Fo Guang Shan cuja matriz é em Taiwan a qual tem como objetivos difundir o Dharma por meio da cultura desenvolver talentos por meio da educação beneficiar a sociedade pela caridade e purificar a mente por meio do desenvolvimento espiritual O mestre fundador da organização Hsing Yün divulga o chamado Budismo Humanista que com seu caráter antropocêntrico pretende ressaltar a característica pragmática do Budismo Os alunos da Universidade Livre Budista devem com o decorrer do curso alcançar desenvolvimento espiritual por meio do estudo dessa religião e aprender como utilizar os ensinamentos budistas de forma que contribuam para o bem-estar social do meio ao qual estão inseridos A característica pragmática ressaltada pelo currículo do curso se assemelha ao que Ken Jones chama de Budismo socialmente engajado visto por alguns autores como a necessidade de reunião de budistas independente da linhagem em prol de uma abordagem ética e pragmática do Budismo focada no benefício social O trabalho contribui para a discussão sobre a instalação da organização Fo Guang Shan no Brasil por meio do uso de características educacionais inerentes no Budismo além de contribuir para a discussão sobre as motivações que levaram à instalação do curso e do que ele representa tanto para a comunidade local quanto para os chineses e seus descendentes considerando a sustância da oferta a inter-relação entre o movimento religioso e a sociedade o grau de abertura da rede de membros e a competência organizacional do templo tal discussão tem como base o sociólogo Rodney Stark Sua conclusão principal é a rigidez das regras monásticas às quais os alunos devem se submeter bem como a validade limitada do diploma emitido pela organização, determinam uma evasão significativa
29

Áreas verdes e conforto térmico: o papel da vegetação no controle dos ventos / Green areas and thermal comfort: the role of vegetation in control of winds

Zanlorenzi, Helena Cristina Padovani 28 August 2015 (has links)
Entender o clima dos espaços urbanos em suas diversas conformações é objeto de grande interesse para a melhoria da qualidade de vida da população que usufrui desses espaços. Cada microclima requer intervenções específicas para a obtenção de condições favoráveis de conforto higrotérmico tendo em vista a saúde e o bem estar de seus usuários. O objetivo desta pesquisa foi avaliar elementos de vegetação como barreira aos ventos visando o conforto térmico em espaços abertos. O procedimento utilizado foi quantificar a interferência de elementos vegetais na passagem dos ventos, na altura dos pedestres, a partir de configurações de vegetação pré-estabelecidas. O cenário eleito para este estudo foi a área externa do Campus da Universidade Metodista de Piracicaba (UNIMEP), localizado no bairro Taquaral em Piracicaba, SP. Embora trate-se de clima predominantemente quente, há relatos de desconforto no local em dias frios decorrente do excesso de ventos. Foram estudadas três diferentes espécies dispostas em arranjos com intenção de barreira aos ventos: Jasminum mesnyi Hance, Pseudosasa japonica (Steud.) Makino e Pinus caribaea Morelet. As variáveis microclimáticas medidas foram temperatura do ar, umidade relativa do ar e velocidade dos ventos, em três posições distintas por espécie: em um campo aberto próximo, antes e depois da barreira. O período de coleta de dados foi das 9 às 21 horas, em intervalos de 3 minutos, durante três dias por espécie, nos meses de agosto e setembro de 2014. Os resultados obtidos no campo aberto foram comparados aos registrados na estação meteorológica da ESALQ-USP no mesmo período. Foi feita a medição do LAI (Índice de Área Foliar) das espécies. Foram realizadas simulações computacionais em modelagem da área no programa ENVI-met® 3.1, com os dados de Densidade de Área Foliar (LAD) estimados a partir dos valores de LAI obtidos nas medições, como parte dos estudos de viabilidade para adoção do LAI como parâmetro na previsão de resultados, o que permitiria sua aplicabilidade a outras espécies. Os resultados obtidos indicam uma tendência favorável a este princípio, porém estudos com maior intensidade amostral são necessários para obtenção desta correlação. Outras aplicações podem ser beneficiadas com esta linha de estudo, como a previsão do risco de queda de árvores. / Understanding the climate of urban spaces in their various conformations is subject of great interest to improve the quality of life of the population that occupies these spaces. Each microclimate requires specific interventions to obtain favorable terms of hygrothermal comfort owing to health and welfare of its members. The objective of this research was to evaluate plant matter as a barrier to winds targeting the thermal comfort in open spaces. The procedure was quantifying the interference of tree elements in the passage of winds, at a pedestrian level, from pre-established vegetation settings. The chosen scenario for this study was the campus of the Universidade Metodista de Piracicaba (UNIMEP), located in the Taquaral neighborhood in Piracicaba, SP. While dealing is predominantly warm weather, discomfort is reported in cold weather due to the excessive winds in the external areas. We studied three different species placed in arrangements intended as wind barriers: Jasminum mesnyi Hance, Pseudosasa japonica (Steud.) Makino and Pinus caribaea Morelet. Microclimate variables measured were air temperature, relative humidity and wind speed, in three different positions by species: in a nearby open field, before and after the barrier. The data collection period was from 9 to 21 o\'clock, at 3-minute intervals for three days by species, in August and September 2014. Results obtained in open field were compared with those recorded at ESALQ-USP\'s weather station during the same period. The LAI (Leaf Area Index) of the species was measured. Computer simulations were performed by modeling the area in ENVImet® 3.1 program, with the Leaf Area Density data (LAD) estimated from the LAI values obtained in measurements, as part of feasibility studies for the adoption of LAI as a parameter in the forecast results, allowing its applicability to other species. The results indicate a positive trend towards this principle, however, studies with larger sample intensity are required in order to achieve this correlation. Other applications may benefit from this line of study, such as the prediction of falling trees risks.
30

Áreas verdes e conforto térmico: o papel da vegetação no controle dos ventos / Green areas and thermal comfort: the role of vegetation in control of winds

Helena Cristina Padovani Zanlorenzi 28 August 2015 (has links)
Entender o clima dos espaços urbanos em suas diversas conformações é objeto de grande interesse para a melhoria da qualidade de vida da população que usufrui desses espaços. Cada microclima requer intervenções específicas para a obtenção de condições favoráveis de conforto higrotérmico tendo em vista a saúde e o bem estar de seus usuários. O objetivo desta pesquisa foi avaliar elementos de vegetação como barreira aos ventos visando o conforto térmico em espaços abertos. O procedimento utilizado foi quantificar a interferência de elementos vegetais na passagem dos ventos, na altura dos pedestres, a partir de configurações de vegetação pré-estabelecidas. O cenário eleito para este estudo foi a área externa do Campus da Universidade Metodista de Piracicaba (UNIMEP), localizado no bairro Taquaral em Piracicaba, SP. Embora trate-se de clima predominantemente quente, há relatos de desconforto no local em dias frios decorrente do excesso de ventos. Foram estudadas três diferentes espécies dispostas em arranjos com intenção de barreira aos ventos: Jasminum mesnyi Hance, Pseudosasa japonica (Steud.) Makino e Pinus caribaea Morelet. As variáveis microclimáticas medidas foram temperatura do ar, umidade relativa do ar e velocidade dos ventos, em três posições distintas por espécie: em um campo aberto próximo, antes e depois da barreira. O período de coleta de dados foi das 9 às 21 horas, em intervalos de 3 minutos, durante três dias por espécie, nos meses de agosto e setembro de 2014. Os resultados obtidos no campo aberto foram comparados aos registrados na estação meteorológica da ESALQ-USP no mesmo período. Foi feita a medição do LAI (Índice de Área Foliar) das espécies. Foram realizadas simulações computacionais em modelagem da área no programa ENVI-met® 3.1, com os dados de Densidade de Área Foliar (LAD) estimados a partir dos valores de LAI obtidos nas medições, como parte dos estudos de viabilidade para adoção do LAI como parâmetro na previsão de resultados, o que permitiria sua aplicabilidade a outras espécies. Os resultados obtidos indicam uma tendência favorável a este princípio, porém estudos com maior intensidade amostral são necessários para obtenção desta correlação. Outras aplicações podem ser beneficiadas com esta linha de estudo, como a previsão do risco de queda de árvores. / Understanding the climate of urban spaces in their various conformations is subject of great interest to improve the quality of life of the population that occupies these spaces. Each microclimate requires specific interventions to obtain favorable terms of hygrothermal comfort owing to health and welfare of its members. The objective of this research was to evaluate plant matter as a barrier to winds targeting the thermal comfort in open spaces. The procedure was quantifying the interference of tree elements in the passage of winds, at a pedestrian level, from pre-established vegetation settings. The chosen scenario for this study was the campus of the Universidade Metodista de Piracicaba (UNIMEP), located in the Taquaral neighborhood in Piracicaba, SP. While dealing is predominantly warm weather, discomfort is reported in cold weather due to the excessive winds in the external areas. We studied three different species placed in arrangements intended as wind barriers: Jasminum mesnyi Hance, Pseudosasa japonica (Steud.) Makino and Pinus caribaea Morelet. Microclimate variables measured were air temperature, relative humidity and wind speed, in three different positions by species: in a nearby open field, before and after the barrier. The data collection period was from 9 to 21 o\'clock, at 3-minute intervals for three days by species, in August and September 2014. Results obtained in open field were compared with those recorded at ESALQ-USP\'s weather station during the same period. The LAI (Leaf Area Index) of the species was measured. Computer simulations were performed by modeling the area in ENVImet® 3.1 program, with the Leaf Area Density data (LAD) estimated from the LAI values obtained in measurements, as part of feasibility studies for the adoption of LAI as a parameter in the forecast results, allowing its applicability to other species. The results indicate a positive trend towards this principle, however, studies with larger sample intensity are required in order to achieve this correlation. Other applications may benefit from this line of study, such as the prediction of falling trees risks.

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