scholarly journals Variação do limite praia duna nos Balneários Mostardense, Mar Grosso, Cassino e Barra do Chuí – RS no intervalo entre 2003-2015

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Karine Bastos Leal ◽  
Ulisses Rocha De Oliveira ◽  
Jean Marcel de Almeida Espinoza
Keyword(s):  
Erdas Imagine ◽  
Polygon Method

As praias oceânicas arenosas são extremamente vulneráveis tanto aos fatores morfodinâmicos naturais quanto às ações antrópicas. O presente trabalho tem como objetivo quantificar e caracterizar, a partir de uma série temporal de imagens orbitais no intervalo de 2003 - 2015, a variação especial do limite entre a praia e a duna frontal nos Balneários Mostardense, Mar Grosso, Cassino e Barra do Chuí – RS, a fim de estimar se estão em processo de erosão, acresção ou estabilidade. A metodologia foi empregada a partir de uma base cartográfica adquirida no software GoogleEarthPro® e técnicas realizadas nos softwares ArcGis 10.3.1® e ERDAS Imagine 2013®. A variação da linha de costa foi obtida a partir do método polígono de mudança (Change Polygon Method), por meio de uma linha de controle aplicada ao limite praia duna frontal. Para o Balneário Mostardense, entre os anos de 2005 e 2014, se obteve taxa erosiva ao longo da costa. O Balneário Mar Grosso, entre os anos de 2006 e 2015, apresentou variações ao longo dos anos, predominando acresção e desenvolvimento dunar. O Balneário Cassino, entre os anos de 2006 e 2015, apresentou taxas acrescivas bastante significativas, associadas ao grande aporte sedimentar para a praia no período. O Balneário da Barra do Chuí, entre os anos de 2003 e 2013, apresentou taxas erosivas e acrescivas. Porém, segundo evidências no campo, constata-se que esse local está sofrendo processo erosivo. As variações do limite superior de praia, limite praia duna, têm relação com a ação de eventos de alta energia hidrodinâmica, que por vezes erodem as dunas frontais, e processos de recomposição, promovidos pela ação marinha e eólica. Os resultados mostraram também a importância das características locais no contexto da variação da linha de costa

scholarly journals Variação das dunas no Balneário Barra do Chuí, extremo sul do Brasil, entre 2005-2018

2021 ◽  
Vol 14 (2) ◽  
pp. 522
Author(s):  
Guilherme Da Silva Rodrigues ◽  
Ulisses Rocha de Oliveira ◽  
Karine Bastos Leal
Keyword(s):  
Human Action ◽  
Sandy Beaches ◽  
Google Earth ◽  
Control Line ◽  
Upward Trend ◽  
Relevant Variable ◽  
Erosion Rates ◽  
Erdas Imagine ◽  
Polygon Method ◽  
Coastal Settlement

As dunas costeiras são feições naturais formadas a partir das praias arenosas, devido a interação do vento, areia e vegetação. No entanto, a ação humana torna-se uma variável cada vez mais relevante em sua dinâmica, ocasionando problemas ambientais. O presente trabalho tem como objetivo quantificar e caracterizar, a partir de uma série temporal de imagens orbitais no intervalo entre 2005 e 2018, a mobilidade das dunas no Balneário Barra do Chuí – RS, especificamente a variação na base das dunas frontais. O intuito é verificar processos de erosão e sedimentação na orla do balneário, bem como a variação do limite do reverso do campo de dunas, onde se encontra a área urbana edificada do balneário. A metodologia foi empregada a partir de imagens orbitais adquiridas no software Google Earth Pro® e técnicas realizadas nos softwares ArcGIS 10.3.1® e ERDAS Imagine 2013®. A variação das linhas de costa analisadas foi obtida a partir do Método do Polígono de Mudança, por meio de uma linha de controle aplicada aos limites praia-duna frontal e reverso da duna. O Balneário Barra do Chuí, no período estudado, apresentou predomínio de taxas de erosão das dunas frontais, onde depósitos pleistocênicos estão sendo diretamente trabalhados pela ação marinha. O reverso das dunas apresentou tendência de avanço em relação à retroterra. Constatou-se que em alguns locais o transporte eólico de sedimentos está soterrando algumas residências. Palavras-chave: Limite praia-duna. Reverso das Dunas. Geotecnologias. Método do Polígono de Mudança.                                                                                                                                 Foredune variation in the Barra do Chui coastal settlement, southern Brazil, between 2005-2018ABSTRACT Foredunes are natural features formed from sandy beaches, due to the interaction of wind, sand, and vegetation. However, human action becomes an increasingly relevant variable in its dynamics, causing environmental problems. The present work aims to quantify and characterize, from a time series of orbital images in the interval between 2005 and 2018, the dune mobility in the Barra do Chui coastal settlement, specifically the variation in the base of the frontal dunes, in order to check erosion and sedimentation at the edge of the resort, as well as the variation of the limit of the reverse of the dune field, where the built-up area of the resort is located. The methodology was used based on orbital images acquired in the Google Earth Pro® software and techniques performed in the ArcGIS 10.3.1® and ERDAS Imagine 2013® software. The variation of the coastlines analyzed was obtained from the Change Polygon Method, through a control line applied to the frontal and reverse dune beach-dune limits. The Barra do Chui coastal settlement, in the studied period, presented a predominance of erosion rates of the frontal dunes, where Pleistocene deposits are being directly worked by the marine action. The reverse side of the dunes showed an upward trend in relation to the retrograde, in fact, in some places, wind sediment transport has already been burying some homes. Keywords: Dune-Beach Limit. Dunes Reverse. Geotechnologies. Change Polygon Method

An Analysis and Comparison of Areal Precipitation Estimation

2015 ◽  
Vol 737 ◽  
pp. 737-740
Author(s):  
Xia Zhao ◽  
Wei Hua Zhang ◽  
Ming Xing Wang
Keyword(s):  
Modified Method ◽  
Precipitation Estimation ◽  
Areal Precipitation ◽  
Polygon Method

This article illustrates different methods of calculating average areal precipitation, especially Thieseen polygon method and its modified method: percentage weighted polygon method.it compares various conditions of application and gives some suggestions for further study about areal precipitation estimation.

scholarly journals Territory size of three Antbirds (Aves, Passeriformes) in an Atlantic Forest fragment in southeastern Brazil

2006 ◽  
Vol 23 (3) ◽  
pp. 692-698 ◽  
Author(s):  
Charles Duca ◽  
Tadeu J. Guerra ◽  
Miguel Â. Marini
Keyword(s):  
Forest Edge ◽  
Neotropical Region ◽  
Bird Communities ◽  
Territory Size ◽  
Southeastern Brazil ◽  
Forest Fragment ◽  
Dirt Road ◽  
Forested Landscapes ◽  
Pyriglena Leucoptera ◽  
Polygon Method

Territory size is an important ecological attribute of populations that has been considered a factor determines population density. Antbirds is a large group of mainly insectivorous Neotropical passerines, usually well represented in bird communities from forested landscapes in Neotropical region. Territory sizes for three Antbirds, Thamnophilus caerulescens (Vieillot, 1816) (Variable Antshrike), Dysithamnus mentalis (Temmink, 1823) (Plain Antvireo) e Pyriglena leucoptera (Vieillot, 1818) (White-shouldered Fire-eye), were mapped and their area estimated by the convex polygon method in a 50 ha forest fragment, in southeastern Brazil. The three species presented small territories of similar sizes (< 2 ha) both during the non-reproductive and the reproductive seasons of 2000-2001. Territories overlapped considerably among species but not intraspecifically. Territory sizes increased with body mass of the three species studied (P. leucoptera > T. caerulescens > D. mentalis). We failed to find any effect on territory size for the three species associated with forest edge or distance to the dirt road.

scholarly journals Groundwater Balance Study in the High Barind, Bangladesh

2013 ◽  
Vol 39 ◽  
pp. 11-26 ◽  
Author(s):  
AHM Selim Reza ◽  
Quamrul Hasan Mazumder ◽  
Mushfique Ahmed
Keyword(s):  
Groundwater Recharge ◽  
Groundwater Storage ◽  
Balance Study ◽  
Groundwater Balance ◽  
Thiessen Polygon ◽  
Storage Potential ◽  
Polygon Method ◽  
Annual Discharge

The annual groundwater recharge and discharge of aquifer of the Sapahar and Porsha Upazillas is estimated by Thiessen polygon method varies from 106.41 to 244 Mm3 and 93.77 to 291 Mm3 respectively. The calculated groundwater recharge of aquifer of the study area shows that the rate of groundwater recharge of aquifer in Porsha Upazilla is higher than that of Sapahar Upazilla and is characterized by very suitable groundwater storage potential. The overall groundwater balance study in the study area indicates that there exists a balance between annual recharge and withdrawal up to 1993 but after period of 1993 discharge exceeds the recharge continuing till today. But hereforth a cumulative annual deficit is found to exist because of progressive annual discharge in Sapahar Upazilla. 23.99 to 42.08 Mm3 of groundwater is discharged by discharging mechanisms. The rest of groundwater is discharged by natural seepage. DOI: http://dx.doi.org/10.3329/rujs.v39i0.16539 Rajshahi University J. of Sci. 39, 11-26 (2011)

scholarly journals Estimation of Wheat Area using Sentinel-1 and Sentinel-2 Datasets (A Comparative Analysis)

2019 ◽  
Author(s):  
Ayesha Behzad ◽  
Muneeb Aamir ◽  
Syed Ahmed Raza ◽  
Ansab Qaiser ◽  
Syeda Yuman Fatima ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Random Forest ◽  
Water Body ◽  
Supervised Classification ◽  
Wheat Crop ◽  
Random Forest Classification ◽  
Forest Classification ◽  
Wheat Cultivation ◽  
Erdas Imagine ◽  
Sentinel 2

Wheat is the basic staple food, largely grown, widely used and highly demanded. It is used in multiple food products which are served as fundamental constituent to human body. Various regional economies are partially or fully dependent upon wheat production. Estimation of wheat area is essential to predict its contribution in regional economy. This study presents a comparative analysis of optical and active imagery for estimation of area under wheat cultivation. Sentinel-1 data was downloaded in Ground Range Detection (GRD) format and applied the Random Forest Classification using Sentinel Application Platform (SNAP) tools. We obtained a Sentinel-2 image for the month of March and applied supervised classification in Erdas Imagine 14. The random forest classification results of Sentinel-1 show that the total area under investigation was 1089km2 which was further subdivided in three classes including wheat (551km2), built-up (450 km2) and the water body (89 km2). Supervised classification results of Sentinel-2 data show that the area under wheat crop was 510 km2, however the built-up and waterbody were 477 km2, 102 km2 respectively. The integrated map of Sentinel-1 and Sentinel-2 show that the area under wheat was 531 km2 and the other features including water body and the built-up area were 95 km2 and 463 km2 respectively. We applied a Kappa coefficient to Sentinel-2, Sentinel-1 and Integrated Maps and found an accuracy of 71%, 78% and 85% respectively. We found that remotely sensed algorithms of classifications are reliable for future predictions.

scholarly journals New technology for mineral deposits prediction to identify prospective areas in the Zhezkazgan ore region

2021 ◽  
Vol 15 (2) ◽  
pp. 134-142
Author(s):  
Boris Zeylik ◽  
Yalkunzhan Arshamov ◽  
Refat Baratov ◽  
Alma Bekbotayeva
Keyword(s):  
Remote Sensing ◽  
Satellite Images ◽  
New Technology ◽  
Methodological Approach ◽  
Cost Savings ◽  
Remote Sensing Data ◽  
Ring Structure ◽  
Mineral Deposits ◽  
Erdas Imagine ◽  
Radar Satellite

Purpose. Exploration and predicting the prospective areas in the Zhezkazgan ore region to set up detailed prospecting and evaluation works using new integrated technologies of prediction constructions in the mineral deposits geology. Methods. An integrated methodological approach is used, including methods for deciphering the Earth’s remote sensing (ERS) data, the use of geophysical data and methods of analogy and actualism. All constructions are made in accordance with the principles of shock-explosive tectonics (SET). Prediction constructions are started with the selection of remote sensing data for the studied region and interpretation based on the processing of radar satellite images obtained from the Radarsat-1 satellite. The radar satellite images are processed in the Erdas Imagine software package. Findings. New local prospective areas have been identified, within which it is expected to discover the deposits. Their reserves are to replenish the depleted ore base in the Zhezkazgan region. Area of the gravity maximum 1 (the Near), considered to be the most promising, is located in close proximity to the city of Zhezkazgan; area of the gravity maximum 2 (the Middle); area of the gravity maximum 3 (the Distant-Tabylga); area of the gravity maximum 6 (the Central). A prospective area has been also revealed, overlaid by a loose sediment cover and located inside the Terekty ring structure, as well as the area of a thick stratum of pyritized grey sandstones, which is adjacent to the Sh-2 well drilled to the south of the Zhezkazgan field. Originality. The use of a new prediction technology, in contrast to the known ones, is conditioned by the widespread use of the latest remote information from satellite images, which increases the accuracy of identifying the prospective areas of fields. Practical implications. The new technology for predicting mineral deposits makes it possible to significantly reduce the areas exposed to priority prospecting, which provides significant cost savings.

scholarly journals Land Use/Land Cover Changes in a Disturbed River Watershed Kenya

2019 ◽  
Vol 3 (2) ◽  
pp. 29
Author(s):  
Zachary Gichuru Mainuri ◽  
John M. Mironga ◽  
Samuel M. Mwonga
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Land Cover ◽  
Remote Sensing Image ◽  
Land Cover Changes ◽  
Land Use Land Cover ◽  
Human Needs ◽  
Observation Systems ◽  
Erdas Imagine ◽  
Remote Sensing Image Processing

Drivers of land use change were captured by the use of DPSIR model where Drivers (D) represented human needs, Pressures (P), human activities, State (S), the ecosystem, Impact (I) services from the ecosystem and Response (R), the decisions taken by land users. Land sat MSS and Land sat ETM+ (path 185, row 31) were used in this study. The Land sat ETM+ image (June 1987, May, 2000 and July, 2014) was downloaded from USGS Earth Resources Observation Systems data website. Remote sensing image processing was performed by using ERDAS Imagine 9.1. Two land use/land cover (LULC) classes were established as forest and shrub land. Severe land cover changes was found to have occurred from 1987-2000, where shrub land reduced by -19%, and forestry reduced by -72%. In 2000 – 2014 shrub land reduced by-45%, and forestry reduced by -64%. Forestry and shrub land were found to be consistently reducing.

scholarly journals Distribution update, conservation status and color in life of the rare Amazonian snake, Eutrachelophis papilio Zaher and Prudente 2019 (Serpentes: Xenodontini)

2020 ◽  
Vol 50 (3) ◽  
pp. 252-255
Author(s):  
Nathalie CITELI ◽  
Mariana DE-CARVALHO ◽  
Reuber BRANDÃO
Keyword(s):  
Convex Polygon ◽  
Conservation Status ◽  
Biological Data ◽  
Distribution Area ◽  
Minimum Convex Polygon ◽  
Human Footprint ◽  
Data Deficient ◽  
First Time ◽  
Polygon Method ◽  
Anthropic Pressure

ABSTRACT The rare Amazonian snake Eutrachelophis papilio is known from only five individuals, from four localities, belonging to its type-series, the more recent collected over 10 years ago. Here, we expand its distribution and describe its color in life for the first time. We also provide an estimate of its distribution area using the minimum convex polygon method and identify the values of anthropic pressure within its known distribution range with the Human Footprint Index. The new occurrence is located 291 km from the nearest known locality and its distribution is associated with pristine forests. Considering its rarity, and the absence of demographic and biological data, we suggest that the species should be classified as Data Deficient by IUCN criteria.

scholarly journals SURVEY TERESTRIS PENGUKURAN JARING KONTROL HORIZONTAL ORDE-4 DENGAN MENGGUNAKAN METODE POLIGON TERTUTUP

2019 ◽  
Vol 13 (1) ◽  
pp. 25
Author(s):  
Mutrofin Rozaq ◽  
Lukito Kurniawan
Keyword(s):  
Research Method ◽  
Building Construction ◽  
Control Points ◽  
Back Face ◽  
Polygon Method ◽  
Campus Building ◽  
Horizontal Control

Construction of the Lumajang PDD campus building, the pilot of the Lumajang Community Community Academy began in 2017. The campus building will be built on 5.3 hectares of land located on Lumajang East Road. The process of building construction, will begin with measuring the boundary of the land by placing coordinates. This research was conducted in order to prepare the location or location of horizontal control points in preparation for the establishment of the Lumajang Community Community Academy campus building.The research method used in measuring coordinate points is the polygon method. Measurements were carried out in terrestrial surveys using theodolite devices. Theodolite devices are among the measurement target points, namely back-face. The measurement target points are located at the specified land boundary. The results of the study obtained a map of the distribution of horizontal control points on the boundaries of campus land and the installation of monuments

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