Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2921
K. Abdivaitov, J. Strobl
In recent years, many investigators started using global land cover data sets for a variety of purposes. ArcGIS Living Atlas of the World offers access to a collection of geographic information from around the globe to perform different analyses including monitoring the status of agricultural lands. Timely and reliable Land Use and Cover Change information can be used for a better understanding of the dynamics of agricultural land use. Therefore, this research aims at analysing agricultural land loss or expansion in Kumkurgan district, Uzbekistan, using openly available global land cover data sets. Using high-resolution, open, accurate, comparable, and timely global land use/land cover data plays a critically important role in enabling dynamic change analysis. Such analysis has a remarkable impact, particularly for agricultural lands with the aim of their more effective use and addressing the ongoing demand for other land use types. In addition, these maps support agricultural land allocation decisions and further land use planning for sustainable development as well. We performed agricultural areas change analysis leveraging data from the Living Atlas infrastructure between 2017 and 2022, using ArcGIS Pro. To compare the results achieved from globally available online data sets, national summary statistics data on agriculture provided by the Chamber of State Cadastres was used. Our findings indicate that due to hilly terrain, the availability of valuable cropland is limited in comparison to other agricultural land use types like rangeland within the entire study area. Due to state land ownership and centralised planning, mostly two major cash crops - cotton and wheat - are cultivated in these areas. This research is intended as a baseline for ultimately establishing a methodology for the optimisation of agricultural land allocation to specific crops.
近年来，许多调查人员开始将全球土地覆被数据集用于各种目的。ArcGIS Living Atlas of the World（ArcGIS 世界活地图集）提供了对全球地理信息集合的访问，可用于进行不同的分析，包括监测农业用地的状况。及时可靠的土地利用和植被变化信息可用于更好地了解农用土地利用的动态。因此，本研究旨在利用可公开获取的全球土地覆被数据集，分析乌兹别克斯坦库姆库尔干地区的农用土地流失或扩张情况。使用高分辨率、开放、准确、可比和及时的全球土地利用/土地覆被数据在进行动态变化分析方面发挥着极其重要的作用。此类分析具有显著的影响，特别是对农用土地的影响，目的是更有效地利用农用土地，并满足对其他土地利用类型的持续需求。此外，这些地图还支持农业用地分配决策和进一步的土地利用规划，以促进可持续发展。我们利用来自 Living Atlas 基础设施的数据，使用 ArcGIS Pro 对 2017 年至 2022 年期间的农业面积变化进行了分析。为了与全球可用的在线数据集取得的结果进行比较，我们使用了国家地籍局提供的国家农业汇总统计数据。我们的研究结果表明，由于丘陵地形，在整个研究区域内，与牧场等其他农业用地类型相比，宝贵耕地的可用性有限。由于国有土地所有权和集中规划，这些地区主要种植棉花和小麦这两种主要经济作物。这项研究的目的是作为一个基准，最终为优化特定作物的农业用地分配建立一套方法。
{"title":"Agricultural Land Use Dynamics - A Case Study of Kumkurgan District, Uzbekistan","authors":"K. Abdivaitov, J. Strobl","doi":"10.52939/ijg.v19i11.2921","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2921","url":null,"abstract":"In recent years, many investigators started using global land cover data sets for a variety of purposes. ArcGIS Living Atlas of the World offers access to a collection of geographic information from around the globe to perform different analyses including monitoring the status of agricultural lands. Timely and reliable Land Use and Cover Change information can be used for a better understanding of the dynamics of agricultural land use. Therefore, this research aims at analysing agricultural land loss or expansion in Kumkurgan district, Uzbekistan, using openly available global land cover data sets. Using high-resolution, open, accurate, comparable, and timely global land use/land cover data plays a critically important role in enabling dynamic change analysis. Such analysis has a remarkable impact, particularly for agricultural lands with the aim of their more effective use and addressing the ongoing demand for other land use types. In addition, these maps support agricultural land allocation decisions and further land use planning for sustainable development as well. We performed agricultural areas change analysis leveraging data from the Living Atlas infrastructure between 2017 and 2022, using ArcGIS Pro. To compare the results achieved from globally available online data sets, national summary statistics data on agriculture provided by the Chamber of State Cadastres was used. Our findings indicate that due to hilly terrain, the availability of valuable cropland is limited in comparison to other agricultural land use types like rangeland within the entire study area. Due to state land ownership and centralised planning, mostly two major cash crops - cotton and wheat - are cultivated in these areas. This research is intended as a baseline for ultimately establishing a methodology for the optimisation of agricultural land allocation to specific crops.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":" 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139197516","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}
In many citizen science projects the use of geospatial technologies plays an important role. This refers in particular to initiatives where the public contributes spatial data. Along with the benefits, such initiatives also face challenges related to the quantity and quality of data provided. A suitable means of overcoming these problems are user-centered applications. However, since developers often lack a sufficient understanding of the requirements of users from the public, their appropriate involvement in application development is crucial. Despite existing approaches, there is still a need to further improve user involvement in these processes to deliver (more) user-centric applications. This paper contributes to this by presenting experiences from the u 3 Green project. The aim of u 3 Green is to develop an application tailored for young people to contribute spatial data about urban green that support the implementation of child-and youth-friendly cities. To generate a youth-centered application, a project-specific development process was created, which combines strong participatory design with the prototyping model and selected methods to involve young people in all development tasks. Collaborating with young people in this way confirmed several well-known aspects of designing user-centered data contribution solutions but also revealed new, previously unknown criteria for the implementation of user-centered applications.
在许多公民科学项目中，地理空间技术的使用发挥着重要作用。这尤其是指由公众提供空间数据的举措。在带来好处的同时，这类活动也面临着与所提供数据的数量和质量有关的挑战。以用户为中心的应用是克服这些问题的合适手段。然而，由于开发人员往往对公众用户的需求缺乏足够了解，因此他们适当参与应用程序开发至关重要。尽管已有一些方法，但仍有必要进一步提高用户在这些过程中的参与度，以提供（更多）以用户为中心的应用程序。本文通过介绍 u 3 Green 项目的经验，对此有所贡献。u 3 绿色 "项目的目的是开发一款专为年轻人量身定制的应用程序，让他们提供有关城市绿化的空间数据，以支持儿童和青少年友好型城市的实施。为了开发一个以青年为中心的应用程序，我们创建了一个特定于项目的开发流程，该流程将强大的参与式设计与原型模型和选定的方法相结合，让青年参与到所有开发任务中。通过这种方式与年轻人合作，证实了设计以用户为中心的数据贡献解决方案的几个众所周知的方面，同时也揭示了实施以用户为中心的应用程序的新的、以前未知的标准。
{"title":"Towards more User-Centered Contributory Citizen Science Initiatives: Learning from the u3Green Approach","authors":"S. Hennig, Vogler, T. Schötz","doi":"10.52939/ijg.v19i11.291","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.291","url":null,"abstract":"In many citizen science projects the use of geospatial technologies plays an important role. This refers in particular to initiatives where the public contributes spatial data. Along with the benefits, such initiatives also face challenges related to the quantity and quality of data provided. A suitable means of overcoming these problems are user-centered applications. However, since developers often lack a sufficient understanding of the requirements of users from the public, their appropriate involvement in application development is crucial. Despite existing approaches, there is still a need to further improve user involvement in these processes to deliver (more) user-centric applications. This paper contributes to this by presenting experiences from the u 3 Green project. The aim of u 3 Green is to develop an application tailored for young people to contribute spatial data about urban green that support the implementation of child-and youth-friendly cities. To generate a youth-centered application, a project-specific development process was created, which combines strong participatory design with the prototyping model and selected methods to involve young people in all development tasks. Collaborating with young people in this way confirmed several well-known aspects of designing user-centered data contribution solutions but also revealed new, previously unknown criteria for the implementation of user-centered applications.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"29 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205365","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2925
N. Ismailov, Chymyrov, A. Bekturov, A. Karagulov
This study aims to investigate the potential of TanDEM-X DEM and geoinformation technology for mapping and assessing avalanche hazard along the North-South alternative road. This new 433kilometer long transportation corridor connects the northern part (from the Balykchy city) with the southern part (to the Jalal-Abad city) of Kyrgyzstan, separated by the Fergana Mountain range. The North-South road under construction should become an strategic automobile route between two parts of the country, an alternative to the existing Bishkek-Osh road, which passes through high mountainous regions. The existing road is subject to congestion and closures in natural emergencies, in cases of territorial disputes of neighbor countries, and affected economic development of the country. The road construction in the high mountainous areas requires a detailed study of all types of natural and man-made hazards and risk assessment. There are many road sections under potential hazards of avalanches, landslides and rock falls. Research and mapping of all types of natural hazards requires the use of modern engineering survey technologies, remote sensing data, geographic information systems and field research. Digital Elevation Models and Digital Surface Models have many advantages providing detailed information about the terrain's topography, which is essential for assessing avalanche hazard and risk. The TanDEM-X DEM gives detailed topographic information, including elevation, surface slope, aspect, and curvature used to identify potential avalanche release areas for assessing avalanche risk and implementing mitigation measures.
本研究旨在调查 TanDEM-X DEM 和地理信息技术在绘制和评估南北替代公路沿线雪崩危害方面的潜力。这条全长 433 公里的新交通走廊连接吉尔吉斯斯坦北部（从 Balykchy 市）和南部（至 Jalal-Abad 市），两地之间被费尔干纳山脉隔开。建设中的南北公路将成为连接吉尔吉斯斯坦两个地区的战略汽车通道，替代现有的穿越高山地区的比什凯克-奥什公路。现有公路在遇到自然紧急情况、邻国领土争端时会出现拥堵和关闭，并影响国家的经济发展。在高山地区修建公路需要对各种自然和人为灾害进行详细研究和风险评估。许多路段都存在雪崩、滑坡和落石等潜在危险。研究和绘制各类自然灾害的地图需要利用现代工程测量技术、遥感数据、地理信息系统和实地研究。数字高程模型和数字地表模型具有许多优势，可提供有关地形地貌的详细信息，这对于评估雪崩危害和风险至关重要。TanDEM-X DEM 提供了详细的地形信息，包括海拔高度、表面坡度、倾斜度和曲率，用于确定潜在的雪崩释放区域，以评估雪崩风险并实施缓解措施。
{"title":"GIS Based Spatial Modelling of Snow Avalanche Hazard along the North-South Alternative Road","authors":"N. Ismailov, Chymyrov, A. Bekturov, A. Karagulov","doi":"10.52939/ijg.v19i11.2925","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2925","url":null,"abstract":"This study aims to investigate the potential of TanDEM-X DEM and geoinformation technology for mapping and assessing avalanche hazard along the North-South alternative road. This new 433kilometer long transportation corridor connects the northern part (from the Balykchy city) with the southern part (to the Jalal-Abad city) of Kyrgyzstan, separated by the Fergana Mountain range. The North-South road under construction should become an strategic automobile route between two parts of the country, an alternative to the existing Bishkek-Osh road, which passes through high mountainous regions. The existing road is subject to congestion and closures in natural emergencies, in cases of territorial disputes of neighbor countries, and affected economic development of the country. The road construction in the high mountainous areas requires a detailed study of all types of natural and man-made hazards and risk assessment. There are many road sections under potential hazards of avalanches, landslides and rock falls. Research and mapping of all types of natural hazards requires the use of modern engineering survey technologies, remote sensing data, geographic information systems and field research. Digital Elevation Models and Digital Surface Models have many advantages providing detailed information about the terrain's topography, which is essential for assessing avalanche hazard and risk. The TanDEM-X DEM gives detailed topographic information, including elevation, surface slope, aspect, and curvature used to identify potential avalanche release areas for assessing avalanche risk and implementing mitigation measures.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201749","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2917
A. Nazarkulova
Based on an extensive survey of demand (‘needs’) and supply (existing study programs) a framework for trans-disciplinary capacity building in Digital Earth concepts, methods and technologies was developed by the authors. In collaboration with universities from the partner countries Armenia and Kyrgyzstan project funding from the Austrian Development Cooperation was acquired to support implementation. Recognizing the need for an explicit spatial approach from disciplines reaching far beyond the traditional ‘geospatial’ subjects like Geography, Geoinformatics, Geodesy or Planning, the DEvision project addresses study programs like Economics, Ecology, Engineering or Journalism through a focused set of foundational modules implemented as a minor subject or certificate. This vision of a Digital Earth is aligned with general digital transformation in society and business, with implementation of sustainable development goals, and a live-long learning paradigm. Based on modern curriculum concepts and pedagogical concepts like active and blended learning, the DEvision initiative provides a set of five modules as teaching and learning resources. These are primarily set up as open educational resources (OER) supporting teachers, and not intended as self-learning media. Instructors within the respective study programs are expected to guide, mentor and monitor students through assigned online learning materials, or using these resources within existing syllabi and curricula. Overall DEvision follows several clearly defined principles: (i) blended learning based on online resources, (ii) instructor-led pathways aligned with students’ majors, (iii) a modern approach to GIS entirely based on cloud platforms, and (iv) orienting students towards a continuous professional development principle based on online communities.
{"title":"Digital Earth Competences Across Disciplines","authors":"A. Nazarkulova","doi":"10.52939/ijg.v19i11.2917","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2917","url":null,"abstract":"Based on an extensive survey of demand (‘needs’) and supply (existing study programs) a framework for trans-disciplinary capacity building in Digital Earth concepts, methods and technologies was developed by the authors. In collaboration with universities from the partner countries Armenia and Kyrgyzstan project funding from the Austrian Development Cooperation was acquired to support implementation. Recognizing the need for an explicit spatial approach from disciplines reaching far beyond the traditional ‘geospatial’ subjects like Geography, Geoinformatics, Geodesy or Planning, the DEvision project addresses study programs like Economics, Ecology, Engineering or Journalism through a focused set of foundational modules implemented as a minor subject or certificate. This vision of a Digital Earth is aligned with general digital transformation in society and business, with implementation of sustainable development goals, and a live-long learning paradigm. Based on modern curriculum concepts and pedagogical concepts like active and blended learning, the DEvision initiative provides a set of five modules as teaching and learning resources. These are primarily set up as open educational resources (OER) supporting teachers, and not intended as self-learning media. Instructors within the respective study programs are expected to guide, mentor and monitor students through assigned online learning materials, or using these resources within existing syllabi and curricula. Overall DEvision follows several clearly defined principles: (i) blended learning based on online resources, (ii) instructor-led pathways aligned with students’ majors, (iii) a modern approach to GIS entirely based on cloud platforms, and (iv) orienting students towards a continuous professional development principle based on online communities.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202163","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2923
K. Samarkhanov, M. Sadenova, N. Beisekenov
Using satellite imagery, this study investigates the spectral reflectance characteristics of crops at the OHMK farm in Eastern Kazakhstan, focusing on wheat and barley. The analysis reveals significant differences in spectral reflectance, particularly in the visible and near-infrared regions, and tracks change over time during different growth stages. Employing principal component analysis (PCA), strong correlations are observed between specific spectral bands and principal components, providing insights into crop variability. Derived equations enable the estimation of principal component values based on spectral information. These findings have implications for crop monitoring, management, and precision agriculture, offering potential yield optimization and resource allocation improvements. The study highlights the potential use of spectral reflectance analysis for crop health assessment and yield prediction, with implications for agricultural decision-making and enhanced productivity. Further research is needed to expand the application of this approach to other crops and conditions.
{"title":"Analysis of Crop Spectral Reflectance at the Croplands in Eastern Kazakhstan Using Satellite Imagery","authors":"K. Samarkhanov, M. Sadenova, N. Beisekenov","doi":"10.52939/ijg.v19i11.2923","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2923","url":null,"abstract":"Using satellite imagery, this study investigates the spectral reflectance characteristics of crops at the OHMK farm in Eastern Kazakhstan, focusing on wheat and barley. The analysis reveals significant differences in spectral reflectance, particularly in the visible and near-infrared regions, and tracks change over time during different growth stages. Employing principal component analysis (PCA), strong correlations are observed between specific spectral bands and principal components, providing insights into crop variability. Derived equations enable the estimation of principal component values based on spectral information. These findings have implications for crop monitoring, management, and precision agriculture, offering potential yield optimization and resource allocation improvements. The study highlights the potential use of spectral reflectance analysis for crop health assessment and yield prediction, with implications for agricultural decision-making and enhanced productivity. Further research is needed to expand the application of this approach to other crops and conditions.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206927","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2927
{"title":"GIS Based Analysis of Land Use Dynamics in Bishkek","authors":"","doi":"10.52939/ijg.v19i11.2927","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2927","url":null,"abstract":"","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"113 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208288","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2915
This study aims to investigate the potential of GNSS data in earthquake zoning and risk assessment in a seismically active region. The study area is located in Uzbekistan, where the interaction of several tectonic plates results in frequent earthquakes. The study focused on two periods from October to October of the next year, respectively, for 2018 and 2019, 2019 and 2020 to analyze GNSS velocities and earthquake zoning maps to identify areas at high risk of seismic activity. The study also utilized GIS and spline interpolation to create continuous surface maps of risk zones based on earthquake hazard data. The results showed that the entire study area is at high seismic risk, with a tendency for rotational movement in the zone of intersection of tectonic plates. Velocities range from 1.56-20.3 mm/yr and 1.64-14 mm/yr for the two periods. Moreover, the analysis of vertical earth surface displacements indicates a tendency towards soil subsidence in the western part and uplift in the northeastern part of the study area. The study concludes that GNSS analysis can provide valuable insights into seismic hazard assessment and improve our understanding of the tectonic processes leading to earthquakes.
{"title":"Analysis of Crustal Movements in the Angren-Almalyk Mining Industrial Area Using GNSS Data","authors":"","doi":"10.52939/ijg.v19i11.2915","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2915","url":null,"abstract":"This study aims to investigate the potential of GNSS data in earthquake zoning and risk assessment in a seismically active region. The study area is located in Uzbekistan, where the interaction of several tectonic plates results in frequent earthquakes. The study focused on two periods from October to October of the next year, respectively, for 2018 and 2019, 2019 and 2020 to analyze GNSS velocities and earthquake zoning maps to identify areas at high risk of seismic activity. The study also utilized GIS and spline interpolation to create continuous surface maps of risk zones based on earthquake hazard data. The results showed that the entire study area is at high seismic risk, with a tendency for rotational movement in the zone of intersection of tectonic plates. Velocities range from 1.56-20.3 mm/yr and 1.64-14 mm/yr for the two periods. Moreover, the analysis of vertical earth surface displacements indicates a tendency towards soil subsidence in the western part and uplift in the northeastern part of the study area. The study concludes that GNSS analysis can provide valuable insights into seismic hazard assessment and improve our understanding of the tectonic processes leading to earthquakes.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207957","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}
Pub Date : 2023-11-30DOI: 10.52939/ijg.v19i11.2913
This research was carried out as part of the "Copernicus assisted environmental monitoring across the Black Sea Basin – PONTOS" project, which aimed to support and enhance environmental monitoring in the Black Sea Basin region by utilizing Earth Observation products obtained from satellite, airborne, and ground sources. The project team evaluated the environmental monitoring system in pilot sites across Armenia, Greece, Georgia, and Ukraine. The current study focused on assessing changes in wetland and floating vegetation cover from 2009-2015 in Lake Sevan, the largest freshwater source in Armenia and one of the project's pilot sites. Monitoring spatio-temporal changes in aquatic vegetation is crucial for understanding the ecological and socioeconomic functions of lake ecosystems, and requires standardized methods. In order to identify floating aquatic vegetation in Lake Sevan, this study utilized Landsat TM and OLI imagery that were acquired during the main growing season from middle May to middle September of the years 2009-2015. To enhance the classification process, vegetation indices such as the Normalized Difference Vegetation Index (NDVI), Normalized Difference Aquatic Vegetation Index (NDAVI), and Normalized Difference Water Index (NDWI) were applied. The findings of this study indicate that medium-resolution Landsat and similar satellite images, which are freely available, can be effectively used to monitor spatiotemporal changes in lakes in a reproducible and continuous manner. However, it was also discovered that algal blooms can significantly hinder the accurate detection of floating vegetation from satellite imagery.
{"title":"Assessing Spatio-temporal Changes of Floating Aquatic Vegetation in Lake Sevan Using Landsat Imagery and Vegetation Indices","authors":"","doi":"10.52939/ijg.v19i11.2913","DOIUrl":"https://doi.org/10.52939/ijg.v19i11.2913","url":null,"abstract":"This research was carried out as part of the \"Copernicus assisted environmental monitoring across the Black Sea Basin – PONTOS\" project, which aimed to support and enhance environmental monitoring in the Black Sea Basin region by utilizing Earth Observation products obtained from satellite, airborne, and ground sources. The project team evaluated the environmental monitoring system in pilot sites across Armenia, Greece, Georgia, and Ukraine. The current study focused on assessing changes in wetland and floating vegetation cover from 2009-2015 in Lake Sevan, the largest freshwater source in Armenia and one of the project's pilot sites. Monitoring spatio-temporal changes in aquatic vegetation is crucial for understanding the ecological and socioeconomic functions of lake ecosystems, and requires standardized methods. In order to identify floating aquatic vegetation in Lake Sevan, this study utilized Landsat TM and OLI imagery that were acquired during the main growing season from middle May to middle September of the years 2009-2015. To enhance the classification process, vegetation indices such as the Normalized Difference Vegetation Index (NDVI), Normalized Difference Aquatic Vegetation Index (NDAVI), and Normalized Difference Water Index (NDWI) were applied. The findings of this study indicate that medium-resolution Landsat and similar satellite images, which are freely available, can be effectively used to monitor spatiotemporal changes in lakes in a reproducible and continuous manner. However, it was also discovered that algal blooms can significantly hinder the accurate detection of floating vegetation from satellite imagery.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139198217","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}
Port is one of the transportation networks that connect sea and land transportation. Thus, it can be ensured that there are many activities closely related to port such as planning, implementation, and maintenance. One of the port maintenance activities is dredging. The sea current that is always moving carries sediment towards the port causing sedimentation in the port pool area and preventing the ship from grounding. Maintenance dredging is required to remove sediment deposits in the pool port to maintain the safety depth. Before dredging, the parameter that has to be considered is the sediment type and its thickness in the area of interest. The study utilized underwater acoustic remote sensing instruments such as Sub Bottom Profiler, Side Scan Sonar, and Multibeam Echosounder to determine the type and thickness of sediments in the port pool. The validation process for the sediment types and the Standard Penetration Test value are derived from the soil investigation data. There are six borehole points at the research location which have a Standard Penetration Test value. The research location is in a shallow water area with depth values ranging from 0.5 m to 7.0 m with respect to Low Water Spring. Based on the SSS image interpretation, the research location is dominated by sediment type of clay. The area of interest is 30541.29 m2 and the total volume of the sediment thickness is 82326.7 m3 with respect to the depth design. This sediment volume is dominated by the soft sediment with the volume of 79614.8 m3. The couple of underwater acoustic remote sensing and soil investigation can provide a continuous representation of the sediment thickness and an essential reference for future research on the estimation of sediment volume in the port pool.
港口是连接海陆运输的交通网络之一。因此，可以确保有许多与端口密切相关的活动，例如计划、实施和维护。疏浚是港口维修活动之一。不断运动的海流将泥沙带向港口，造成港口池区淤积，使船舶无法搁浅。需要进行维修疏浚，以清除池口的沉积物，以维持安全深度。在疏浚之前，必须考虑的参数是沉积物类型及其在感兴趣区域的厚度。利用海底剖面仪、侧扫声纳、多波束回声测深仪等水声遥感仪器，确定了港口池沉积物的类型和厚度。沉积物类型的验证过程和标准侵彻试验值是根据土壤调查数据得出的。在研究地点有6个钻孔点具有标准穿透试验值。研究地点为浅水区，相对于大潮低潮，水深为0.5 m ~ 7.0 m。基于SSS图像解译，研究区域以粘土沉积物类型为主。研究区面积为30541.29 m2，泥沙厚度总体积为82326.7 m3。泥沙体积以软质泥沙为主，为79614.8 m3。水声遥感与土壤调查相结合可以提供连续的底泥厚度表征，为今后港口池底泥体积估算研究提供重要参考。
{"title":"Integrating Underwater Acoustic Remote Sensing and Soil Investigation Data for Sediment Volume Estimation in Gresik Jasatama Port Pool, Indonesia","authors":"","doi":"10.52939/ijg.v19i9.2875","DOIUrl":"https://doi.org/10.52939/ijg.v19i9.2875","url":null,"abstract":"Port is one of the transportation networks that connect sea and land transportation. Thus, it can be ensured that there are many activities closely related to port such as planning, implementation, and maintenance. One of the port maintenance activities is dredging. The sea current that is always moving carries sediment towards the port causing sedimentation in the port pool area and preventing the ship from grounding. Maintenance dredging is required to remove sediment deposits in the pool port to maintain the safety depth. Before dredging, the parameter that has to be considered is the sediment type and its thickness in the area of interest. The study utilized underwater acoustic remote sensing instruments such as Sub Bottom Profiler, Side Scan Sonar, and Multibeam Echosounder to determine the type and thickness of sediments in the port pool. The validation process for the sediment types and the Standard Penetration Test value are derived from the soil investigation data. There are six borehole points at the research location which have a Standard Penetration Test value. The research location is in a shallow water area with depth values ranging from 0.5 m to 7.0 m with respect to Low Water Spring. Based on the SSS image interpretation, the research location is dominated by sediment type of clay. The area of interest is 30541.29 m2 and the total volume of the sediment thickness is 82326.7 m3 with respect to the depth design. This sediment volume is dominated by the soft sediment with the volume of 79614.8 m3. The couple of underwater acoustic remote sensing and soil investigation can provide a continuous representation of the sediment thickness and an essential reference for future research on the estimation of sediment volume in the port pool.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"15 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135510379","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}
Pub Date : 2023-11-01DOI: 10.52939/https://journals.sfu.ca/ijg/index.php/journal/article/view/2881
It is crucial for effective flood events management in a river basin that the relationship between land use, land cover (LULC) changes and peak flow. The flood in Central Vietnam got highly affected in recent decades due to several factors like deforestation, urbanization, lack of hydrometeorological stations, developmental monitoring and planning. This study quantifies the influence of LULC on the peak flow dynamics using a hydrological model, remote sensing technology in the Laigiang river basin. The responses of LULC changes on the peak flow and runoff volume were investigated using daily rainfall in December 2016 at the study area. The usage of the hydrological model defined that the changes in LULCs 2010-2020 caused momentous changes in hydrological response towards water flow. The rainy season floods in the bare land, low-density vegetation area, urban/built-up, and bare land while the normal flow gets the contribution from interflow generated from the dense forest.
{"title":"Impact Assessment of Land Use and Land Cover Change on the Runoff Changes on the Historical Flood Events in the Laigiang River Basin of the South Central Coast Vietnam","authors":"","doi":"10.52939/https://journals.sfu.ca/ijg/index.php/journal/article/view/2881","DOIUrl":"https://doi.org/10.52939/https://journals.sfu.ca/ijg/index.php/journal/article/view/2881","url":null,"abstract":"It is crucial for effective flood events management in a river basin that the relationship between land use, land cover (LULC) changes and peak flow. The flood in Central Vietnam got highly affected in recent decades due to several factors like deforestation, urbanization, lack of hydrometeorological stations, developmental monitoring and planning. This study quantifies the influence of LULC on the peak flow dynamics using a hydrological model, remote sensing technology in the Laigiang river basin. The responses of LULC changes on the peak flow and runoff volume were investigated using daily rainfall in December 2016 at the study area. The usage of the hydrological model defined that the changes in LULCs 2010-2020 caused momentous changes in hydrological response towards water flow. The rainy season floods in the bare land, low-density vegetation area, urban/built-up, and bare land while the normal flow gets the contribution from interflow generated from the dense forest.","PeriodicalId":38707,"journal":{"name":"International Journal of Geoinformatics","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135514513","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}
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