Technical Note. Mapping seagrass beds using IKONOS satellite image and side scan sonar measurements: a Japanese case study

2008 ◽  
Vol 29 (1) ◽  
pp. 281-291 ◽  
Author(s):  
T. Sagawa ◽  
A. Mikami ◽  
T. Komatsu ◽  
N. Kosaka ◽  
A. Kosako ◽  
...  
Keyword(s):  
Satellite Image ◽  
Technical Note ◽  
Seagrass Beds ◽  
Side Scan Sonar ◽  
Japanese Case

scholarly journals The Identification of Fishing Ground Area with MODIS Satellite Image (Case Study: South Coast of West Java)

2018 ◽  
Author(s):  
Ketut Wikantika
Keyword(s):  
Chlorophyll A ◽  
Satellite Image ◽  
South Coast ◽  
Data Conversion ◽  
Fishing Ground ◽  
West Java ◽  
Water Region ◽  
Computation Data

According to UNCLOS, Indonesian marine territorial covers an area equal to around 2.8 million square kilometers inner archipelagic seas. Though the Indonesian water region is very wide, the resource within it is not yet been exploited optimally. Indonesia still has problems that have to be copped with, including identification of marine fishing ground areas. This report proposes a technology to make the fish-catching be more efficient and effective with the help of MODIS satellite image in term of Surface Temperature and chlorophyll-a computation. Data conversion from digital number to Water Brightness Temperature are performed. The determination of potential fishing ground area were conducted based on temperature and chlorophyll-a parameters which serve as an indicator of upwelling and observations were carried out on parameters which show this phenomenon. Based on the result, during May 2004 the upwelling process were not happened yet, and it seems to occur in June 2004. It showes by the decreasing of water temperature in South Coast of West Java particularly between the border of West Java and Central of Java. This phenomenon acts as an indicator for the raising of primer productivity and will takes about one month after upwelling to the bloom of phytoplankton.

scholarly journals The Identification of Fishing Ground Area with MODIS Satellite Image (Case Study: South Coast of West Java)

2006 ◽  
Vol 38 (2) ◽  
pp. 147-158 ◽  
Author(s):  
Dudung Muhally Hakim ◽  
Ketut Wikantika ◽  
Nengah Widiadnyana ◽  
Asmi M. Napitu ◽  
Soni Darmawan
Keyword(s):  
Satellite Image ◽  
South Coast ◽  
Fishing Ground ◽  
West Java

scholarly journals Critical Land Detection using Remote Sensing Device and Geographic Information (Case Study of Critical Land Basic of Catchments Area, Alang, Wonogiri)

2017 ◽  
Vol 19 (1) ◽  
pp. 1
Author(s):  
Beny Harjadi
Keyword(s):  
Remote Sensing ◽  
Field Survey ◽  
Critical Level ◽  
Satellite Image ◽  
Geographic Information ◽  
Level Data ◽  
The Difference

Work criteria and indicator of Catchments Area need to be determined because the success and the failure of cultivating Catchments Area can be monitored and evaluated through the determined criteria. Criteria Indicators in utilizing land, one of them is determined based on the erosion index and the ability of utilizing land, for analyzing the land critical level. However, the determination of identification and classification of land critical level has not been determined; as a result the measurement of how wide the real critical land is always changed all the year. In this study, it will be tried a formula to determine the land critical/eve/ with various criteria such as: Class KPL (Ability of Utilizing Land) and the difference of the erosion tolerance value with the great of the erosion compared with land critical level analysis using remote sensing devices. The aim of studying land critical level detection using remote sensing tool and Geographic Information System (SIG) are:1. The backwards and the advantages of critical and analysis method2. Remote Sensing Method for critical and classification3. Critical/and surveyed method in the field (SIG) Collecting and analyzing data can be found from the field survey and interpretation of satellite image visually and using computer. The collected data are analyzed as:a. Comparing the efficiency level and affectivity of collecting biophysical data through field survey, sky photo interpretation, and satellite image analysis.b. Comparing the efficiency level and affectivity of land critical level data that are found from the result of KPL with the result of the measurement of the erosion difference and erosion tolerance.

scholarly journals USO DO SOLO E DEGRADAÇÃO AMBIENTAL: estudo de caso da bacia do Mata Fome em Belém, Pará

2017 ◽  
Vol 2 (7) ◽  
pp. 162
Author(s):  
Marcos Jonatas Damasceno da Silva ◽  
Luziane Mesquita da Luz
Keyword(s):  
Urban Space ◽  
Environmental Degradation ◽  
Health Risks ◽  
Urban Areas ◽  
Satellite Image ◽  
Land Uses ◽  
Vegetation Water ◽  
The Relationship ◽  
Soil Changes

São diversos os problemas presentes nos espaços das cidades brasileiras, principalmente nos grandes espaços urbanos. Um desses problemas é a degradação do meio ambiente decorrente de intervenções não planejadas nesses espaços. Nesse sentido, este trabalho tem o propósito de analisar a relação entre a produção do espaço urbano, que atribui diferentes usos ao solo e a degradação do meio ambiente na Bacia do Mata Fome em Belém, Pará. Além disso, foi realizado um mapeamento do uso do solo da área de estudo, onde foi utilizada a imagem do satélite Ikonos de 2006. Os resultados deste trabalho evidenciaram que a produção do espaço urbano na Bacia do Mata Fome e os diversos usos do solo, provocaram degradação ambiental, por desencadearem a destruição da cobertura vegetal, poluição da água e do solo, mudanças na topografia dos terrenos, inundações, riscos à saúde, entre outros danos.Palavras-chave: Meio ambiente; Urbanização; Bacia hidrográfica; Poluição.USE OF SOIL AND ENVIRONMENTAL DEGRADATION: a case study of Mata Fome basin in Belém, ParáABSTRACTThere are several problems present in the spaces of brazilian cities, especially in large urban areas. One such problem is the degradation of the environment due to unplanned interventions in these spaces. In this sense, this work aims to analyze the relationship between the production of urban space that assigns different uses to soil and environmental degradation in the Mata Fome Watershed in Belém, Pará. In addition, we carried out a mapping of the use of soil of the study area where the satellite image Ikonos 2006. The results of this study indicated that the production of urban space in Mata Fome Watershed and various land uses, caused environmental degradation was used to trigger the destruction of vegetation, water pollution and soil changes in the topography of the land, floods, health risks and other damage.Keywords: Environment; Urbanization; Hydrographic watershed; Pollution.USO DEL SUELO Y DEGRADACIÓN AMBIENTAL: estudio del caso de la cuenca del Mata Fome en Belém, ParáRESUMEN Hay varios problemas presentes en los espacios de las ciudades brasileñas, especialmente en las grandes áreas urbanas. Uno de estos problemas es la degradación del medio ambiente debido a las intervenciones no planificadas en estos espacios. En este sentido, este trabajo tiene como objetivo analizar la relación entre la producción del espacio urbano, que asigna a los diferentes usos del suelo y la degradación del medio ambiente en la Cuenca del Mata Fome en Belém, Pará. Además, se realizó un mapeo del uso del suelo de la zona de estudio, donde la imagen de satélite Ikonos 2006. Los resultados de este estudio indicaron que la producción del espacio urbano en la Cuenca del Mata Fome y diversos usos de la tierra causado la degradación ambiental se utilizó para desencadenar la destrucción de la vegetación, la contaminación del agua y los cambios de suelo en la topografía del terreno, inundaciones, riesgos para la salud, y otros daños.Palabras clave: Medio ambiente; Urbanización; Cuenca hidrográfica; Contaminación.

scholarly journals SURVEI SIDE SCAN SONAR DALAM PENELITIAN ARKEOLOGI BAWAH AIR DI PERAIRAN SUNGAI: STUDI KASUS PADA DAERAH ALIRAN SUNGAI BRANTAS [SIDE SCAN SONAR SURVEY IN RIVERINE UNDERWATER ARCHAEOLOGICAL RESEARCH: CASE STUDY IN THE BRANTAS BASIN]

2021 ◽  
Vol 15 (2) ◽  
pp. 99-112
Author(s):  
Agni Mochtar ◽  
Firman Setiawan ◽  
Shinatria Adhityatama
Keyword(s):  
Cultural Landscape ◽  
Historical Context ◽  
Archaeological Research ◽  
Archaeological Remains ◽  
Side Scan Sonar ◽  
Maritime Cultural Landscape ◽  
Old Maps ◽  
Low Visibility ◽  
Survey Results

Aplikasi metode geofisika menggunakan side scan sonar dalam penelitian arkeologi bawah air belum banyak dilakukan di Indonesia. Tulisan ini memaparkan penggunaan side scan sonar untuk pemetaan dasar sungai dan identifikasi tinggalan arkeologi di dasar sungai dalam penelitian “Sungai Brantas dalam Perspektif Lanskap Kultur Maritim”, serta interpretasi hasil survei side scan sonar tersebut dalam konteks kesejarahan. Selain itu, dalam tulisan ini akan dibahas potensi pengembangan penggunaan side scan sonar dalam penelitian arkeologi bawah air di Indonesia, terutama di perairan sungai. Akuisisi data dilakukan dengan menggunakan side scan sonar Starfish 450H dengan sistem posisi GNSS Trimble R8s. Sementara itu, interpretasi diperoleh dengan melakukan analisis terhadap data peta dan arsip Belanda untuk memahami konteks temporal dari objek yang dideteksi oleh alat side scan sonar. Survei berhasil menunjukkan sedimen di dasar sungai berupa lempung dan lanau, serta beberapa objek yang diduga sebagai bangkai kapal, yang diperkirakan berasal dari pasca abad ke-19 Masehi. Hasil survei side scan sonar menunjukkan tingkat akurasi cukup hingga tinggi dan dapat menjadi pendukung penelitian arkeologi bawah air yang efisien, terutama di perairan yang keruh. Side scan sonar survey as one of the geophysics methods is still scarcely applied in underwater archaeological research in Indonesia. This paper describes the application of side scan sonar survey in mapping riverbed and identifying underwater archaeological remains in the “Sungai Brantas in the Perspective of Maritime Cultural Landscape” project, as well as interpreting its historical context based on survey results. This paper also explores the development of utilizing side scan sonar in underwater archaeological research in Indonesia, particularly in rivers. Data was acquisitioned by using the side scan sonar Starfish 450H and GNSS Trimble R8s positioning system. The interpretation was drawn by analysing related Dutch old maps and archives to understand the historical context of the survey findings. The result shows clay and silt sediment covering most of the riverbed and a number of objects, possibly shipwrecks, estimated as from the nineteenth century. The survey result has a medium to high accuracy. Thus, this method is able to serve as an efficient instrument for underwater archaeological research, especially in the low-visibility waters.

Water in the Time of Drought II: Lessons from Droughts around the World

2021 ◽  
Author(s):  
Raphaëlle Ortiz ◽  
Anamaría Núñez ◽  
Corinne Cathala ◽  
Ana R. Rios ◽  
Mauro Nalesso
Keyword(s):  
Best Practices ◽  
Technical Note ◽  
Lessons Learned ◽  
Institutional Frameworks ◽  
The World ◽  
Relevant Case ◽  
Management Policies ◽  
Successes And Challenges

This technical note is an update to the previous "Water in the Time of Drought: Lessons from Five Droughts Around the World", published in 2018. It explores drought situations and policies in Spain (including the Canary Islands), Chile, Mexico, the dry corridor between Honduras, Guatemala, and El Salvador, Brazil, and South Africa. Each of these countries has recently dealt with droughts and/or developed long-term solutions to manage them. HydroBID, a tool developed by the IDB, will be presented through relevant case studies. After defining drought experiences and institutional frameworks in each country, the brief will explore the successes and challenges of national drought and water management policies. Best practices and lessons learned will be extracted from each case study to help policymakers better prepare for droughts.

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