Boletim De Ciencias Geodesicas最新文献

Exploring spatio-temporal patterns of OpenStreetMap (OSM) contributions in heterogeneous urban areas 探索异构城市地区开放街道地图(OSM)贡献的时空格局

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2023-06-19 DOI: 10.1590/s1982-21702023000200005

E. Elias, F. Amorim, M. Schmidt, S. Camboim

{"title":"Exploring spatio-temporal patterns of OpenStreetMap (OSM) contributions in heterogeneous urban areas","authors":"E. Elias, F. Amorim, M. Schmidt, S. Camboim","doi":"10.1590/s1982-21702023000200005","DOIUrl":"https://doi.org/10.1590/s1982-21702023000200005","url":null,"abstract":": The potential of intrinsic parameters to estimate geospatial data quality on Voluntary Geographic Information (VGI) platforms is a recurrent theme in Cartography. The spatial-temporal distribution in these platforms is very heterogeneous, depending on several factors such as input availability, number, and motivation of volunteers, especially in developing countries. The most recent approaches have been aiming to detail temporal patterns as an additional measure of quality in VGI. This research proposes a methodology to identify and analyze the behavior of the contribution parameters over time (2007-2022) of the OSM platform and differentiates the influences that affect its growth. Part of the Metropolitan region of Curitiba was the study area, subdivided into 1 x 1 km cells. The cumulative growth of contributions was calculated and later adjusted using a Logistic Regression. The obtained parameters made it possible to identify abruptly growing cells caused by external data import, mass contributions, or collective mapping activities. In addition, heterogeneity in the growth of the data available in OSM over time was evident. Furthermore, the proposed methodology promoted the investigation of a new indicator of intrinsic quality based on modelling the spatiotemporal evolution of OSM feature insertions.","PeriodicalId":55347,"journal":{"name":"Boletim De Ciencias Geodesicas","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67566857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial and seasonal dynamics of rainfall in subtropical Brazil 巴西亚热带地区降雨的空间和季节动态

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2023-06-19 DOI: 10.1590/s1982-21702023000200004

Alana Pisoni, J. Pazini, E. Seidel

引用次数: 0

Harmonizing income classes from 2000 and 2010 Brazilian censuses 协调2000年和2010年巴西人口普查的收入阶层

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2023-04-14 DOI: 10.1590/s1982-21702023000100002

Agnes Silva de Araujo, Marcus Saraiva, J. Barros, Alfredo Pereira de Queiroz

引用次数: 0

Study of the geometry influence of the support points in coordonates transformation: application from WGS84 to NS59 datum 坐标变换中支撑点的几何影响研究——从WGS84到NS59基准的应用

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2023-03-13 DOI: 10.1590/s1982-21702023000100001

S. Medjahed

引用次数: 0

The use of satellite for water applications in agriculture: a review 卫星在农业用水方面的应用:综述

Boletim De Ciencias Geodesicas Pub Date : 2023-01-01 DOI: 10.1590/s1982-21702023000300006

Samuel Rodrigues da Cunha, Gabriel do Nascimento Guimarães

引用次数: 0

The influence of slope on the identification of urban centralities: a case study in the municipality of Barra do Piraí, State of Rio de Janeiro, Brazil 坡度对城市中心识别的影响:以巴西里约热内卢州巴拉杜Piraí市为例

Boletim De Ciencias Geodesicas Pub Date : 2023-01-01 DOI: 10.1590/s1982-21702023000400009

Caio Flávio Martinez Fontoura Júnior, Edmur Azevedo Pugliesi, Vilma Mayumi Tachibana

引用次数: 0

The suitability of different vegetation indices to analyses area with landslide propensity using Sentinel -2 Image 不同植被指数对Sentinel -2影像滑坡倾向性区分析的适宜性

Boletim De Ciencias Geodesicas Pub Date : 2023-01-01 DOI: 10.1590/s1982-21702023000300008

Lucilia do Carmo Giordano, Mara Lúcia Marques, Fábio Augusto Gomes Vieira Reis, Claudia Vanessa dos Santos Corrêa, Paulina Setti Riedel

{"title":"The suitability of different vegetation indices to analyses area with landslide propensity using Sentinel -2 Image","authors":"Lucilia do Carmo Giordano, Mara Lúcia Marques, Fábio Augusto Gomes Vieira Reis, Claudia Vanessa dos Santos Corrêa, Paulina Setti Riedel","doi":"10.1590/s1982-21702023000300008","DOIUrl":"https://doi.org/10.1590/s1982-21702023000300008","url":null,"abstract":"Vegetation Indices (VIs) provide spatial information on the vegetation state, which has been associated with landslide propensity. To evaluate how VIs information indicate the landslide propensity, the current study analyzed nine different IVs to identify the categories of vegetation states in the hydrographic basin of Pedra Branca before and after landslide event. The different VIs were obtained using Sentinel-2A (2016) and Sentinel-2B (2018) images. All VIs were tested by cross-table analysis regard to the ability to identify the calculated area for landslide scars, and the VIs were also compared to the NDVI reference by error matrix for the analysis of the accuracy in identifying the vegetation state before the landslide occurrence. The areas with landslide scars totalized 86700m² in 2018 image and NDVI matched ~57% of the No Vegetation category. Before the landslide event, almost all VIs indicated a loss of vegetation vigor (with exception of RENDVI and ARVI) in 2016 image. In addition, the indices (exceptionality MSI) also presented high rates of match to the analysis of NDVI in discerning both Intermediate and Vigorous Vegetation states. However, the areas presenting a healthy vegetation state are reduced, which therefore might be indicating the propensity to landslide event before their occurrences.","PeriodicalId":55347,"journal":{"name":"Boletim De Ciencias Geodesicas","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135660124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Speckle reduction for Sentinel-1A SAR images in the Semi-arid caatinga region, Brazil 巴西半干旱caatinga地区Sentinel-1A SAR图像的斑点减少

Boletim De Ciencias Geodesicas Pub Date : 2023-01-01 DOI: 10.1590/s1982-21702023000300007

Janisson Batista de Jesus, Tatiana Mora Kuplich, Íkaro Daniel de Carvalho Barreto, Fernando Luis Hillebrand, Cristiano Niederauer da Rosa

{"title":"Speckle reduction for Sentinel-1A SAR images in the Semi-arid caatinga region, Brazil","authors":"Janisson Batista de Jesus, Tatiana Mora Kuplich, Íkaro Daniel de Carvalho Barreto, Fernando Luis Hillebrand, Cristiano Niederauer da Rosa","doi":"10.1590/s1982-21702023000300007","DOIUrl":"https://doi.org/10.1590/s1982-21702023000300007","url":null,"abstract":"Due to the absence of studies related to the digital processing of synthetic aperture radar (SAR) images in the semi-arid region of Brazil, the aim of this study was to test different filters for reducing speckle noise in SAR images, serving as a reference for choosing the most suitable filter for different studies in this vegetation. The filters: Gamma Map, Lee Sigma, Median, Frost and Refined Lee in different window sizes were tested on the VV, VH and VH/VV polarizations in the Sentinel-1A images, verifying the responses under the influence of the dry and post-rainy period in the Caatinga vegetation. In the state of Sergipe, Brazil, 30 samples of Caatinga fragments obtained from Sentinel-1A images for the dry and post-rainy season were selected. For all images evaluated, the values of the averages of the equivalent number of looks (ENL) were compared by the Tukey test at 5% significance. The Gamma filter showed the highest amount of means (22) with the highest ENL values, followed by Median (5). The generation of ENL results and their comparison, considering all variables used, was essential to serve as a basis for choosing the filtering method in studies that use data from Sentinel-1A in the Caatinga region.","PeriodicalId":55347,"journal":{"name":"Boletim De Ciencias Geodesicas","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135658959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of GNSS and a refined GGM (XGM2019e) for determining normal heights in the Imbituba Brazilian Vertical Datum and in the International Height Reference System 使用GNSS和改进的GGM (XGM2019e)来确定Imbituba巴西垂直基准面和国际高度参考系统的正常高度

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2022-01-01 DOI: 10.1590/s1982-21702022000200009

R. Delgado, T. L. Rodrigues

{"title":"Use of GNSS and a refined GGM (XGM2019e) for determining normal heights in the Imbituba Brazilian Vertical Datum and in the International Height Reference System","authors":"R. Delgado, T. L. Rodrigues","doi":"10.1590/s1982-21702022000200009","DOIUrl":"https://doi.org/10.1590/s1982-21702022000200009","url":null,"abstract":": This paper aimed to evaluate the use of Global Navigation Satellite System (GNSS) ellipsoidal heights in conjunction with height anomalies provided by Global Geopotential Model (GGM) XGM2019e, refined by Residual Terrain Modelling (RTM) technique, to obtain normal heights in Brazil, referred to the Imbituba Brazilian Vertical Datum (IBVD) and the International Height Reference System (IHRS). For this purpose, a local modelling approach has been analyzed in contrast to the national modeling one on the reference geopotential value. For this, a methodology based on geopotential space was adapted. In the local modeling, two study subregions were defined using the spatial clustering analysis of IBVD and GGM/RTM height anomalies differences outliers. The parameters have been estimated using three different configurations. In the parameters validation step, Root Mean Square Errors (RMSE) of the discrepancies between transformed and Brazilian official normal heights were calculated. In both subregions more accurate results have been obtained with the local modeling. In the SP1 subregion the accuracy increased tenfold (0.97m to 0.10m) and SP2 improved from 0.39m to 0.17m. For the linkage to the future realization of IHRS, the accuracy analysis was not possible. However, discrepancies between calculated normal heights and Brazilian official normal heights have been analyzed.","PeriodicalId":55347,"journal":{"name":"Boletim De Ciencias Geodesicas","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67566033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of local surface displacement using repeated GPS measurements: a case study of the Guabirotuba area, Curitiba, Brazil 利用重复GPS测量分析局部地表位移:以巴西库里蒂巴Guabirotuba地区为例

IF 0.5

Boletim De Ciencias Geodesicas Pub Date : 2022-01-01 DOI: 10.1590/s1982-21702022000100005

Christian Gonzalo Pilapanta Amagua, Jorge Felipe Euriques, S. Alves, C. P. Krueger

引用次数: 1