scholarly journals Remote Observation in Habitat Suitability Changes for Waterbirds in the West Songnen Plain, China

2019 ◽  
Vol 11 (6) ◽  
pp. 1552 ◽  
Author(s):  
Yanlin Tian ◽  
Zongming Wang ◽  
Dehua Mao ◽  
Lin Li ◽  
Mingyue Liu ◽  
...  
Keyword(s):  
Land Cover ◽  
Habitat Suitability ◽  
Human Disturbance ◽  
Remote Sensing Data ◽  
Land Cover Changes ◽  
Songnen Plain ◽  
Landsat Images ◽  
Study Region ◽  
Waterbird Species ◽  
Optimum Grade

Being one of the most important habitats for waterbirds, China’s West Songnen Plain has experienced substantial damage to its ecosystem, especially the loss and degradation of wetlands and grasslands due to anthropogenic disturbances and climate change. These occurrences have led to an obvious decrease in waterbird species and overall population size. Periodic and timely monitoring of changes in habitat suitability and understanding the potential driving factors for waterbirds are essential for maintaining regional ecological security. In this study, land cover changes from 2000 to 2015 in this eco-sensitive plain were examined using Landsat images and an object-based classification method. Four groups of environmental factors, including human disturbance, water situation, food availability, and shelter safety, characterized by remote sensing data were selected to develop a habitat suitability index (HSI) for assessing habitat suitability for waterbirds. HSI was further classified into four grades (optimum, good, general, and poor), and their spatiotemporal patterns were documented from 2000 to 2015. Our results revealed that cropland expansion and wetland shrinkage were the dominant land cover changes. Waterbird habitat areas in the optimum grade experienced a sharp decline by 7195 km2. The habitat area in good suitability experienced reduction at a change rate of −8.64%, from 38,672 km2 to 35,331 km2. In addition, waterbird habitats in the general and poor grades increased overall by 10.31%. More specifically, the total habitat areas with optimum suitable grade, in five national nature reserves over the study region, decreased by 12.21%, while habitat areas with poor suitable grade increased by 3.89%. Changes in habitat suitability could be largely attributed to the increase in human disturbance, including agricultural cultivation from wetlands and grasslands and the expansion of built-up lands. Our findings indicate that additional attention should be directed towards reducing human impact on habitat suitability for sustainable ecosystems.

scholarly journals Analyze of Dynamics and Degree of Anthropogenic Impacts on the Ecogeomorphological Conditions (Case Study of the Kura-Araz Lowland and Surrounding Areas)

2021 ◽  
pp. 92-102
Author(s):  
J. Y. Gasimov
Keyword(s):  
Land Cover ◽  
Building Materials ◽  
Oil And Gas ◽  
Anthropogenic Impacts ◽  
Remote Sensing Data ◽  
Gas Production ◽  
Anthropogenic Factors ◽  
Stream Network ◽  
Landsat Images ◽  
Irrigation Network

Theoretical base of human effects on geomorphological environment, the evolution of anthropogenic impacts and modern situation of human activity were analyzed in the studied area. On the base of supervised and unsupervised classification of the Landsat images (1976–2017) Land use-Land cover map of the territory was compiled. The dynamic and transformation of land covers were determined with the change detection function. It was defined that the most increasing land cover in the area of transformation since 1976 to 2017 is the sown area. Due to the anthropogenic development of the study area, the largest decrease in the area of exposed (33,85%) and saline (25,43%) land cover occurred during this period. Among the listed anthropogenic factors (oil and gas production, production of building materials, grazing, settlements, etc.), it is established that irrigation erosion has a wide radius of encirclement and a high degree of influence. With the application of Geographic Information System technologies, on the base of remote sensing data the density of the irrigation network has been computed and mapped. Ecogeomorphological assessment and zoning of the territory has been carried out. According to the comparative analysis of horizontal (stream network) and anthropogenic (irrigation network) fragmentation it was determined that the estimated maximum cost of anthropogenic fragmentation in the study area is 2,5 times higher than natural horizontal fragmentation.

scholarly journals Land Cover Changes in Open-Cast Mining Complexes Based on High-Resolution Remote Sensing Data

2019 ◽  
Author(s):  
Filipe Silveira Nascimento ◽  
Markus Gastauer ◽  
Pedro Walfir M. Souza-Filho ◽  
Wilson R. Nascimento Jr. ◽  
Diogo C. Santos ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Land Cover ◽  
Land Use Changes ◽  
Remote Sensing Data ◽  
Land Cover Changes ◽  
Special Focus ◽  
Open Cast Mining ◽  
High Resolution Satellite Images ◽  
Open Cast

Remote sensing technologies may play a fundamental role in the environmental assessment of open-cast mining and the accurate quantification of mine land rehabilitation efforts. Here, we developed a systematic geographic object-based image analysis (GEOBIA) approach to map the amount of revegetated area and to quantify the land-use changes in open-cast mines in the Carajás region situated in the eastern Amazon. Based on high-resolution satellite images from 2011 to 2015 from different sensors (GeoEye, WorldView-3 and Ikonos), we quantified forests, cangas (natural metalliferous savanna ecosystems), mine land, revegetated areas and water bodies. Based on the GEOBIA approach, threshold values were established to discriminate land cover classes using spectral bands, and the NDVI and NDWI indices and LiDAR digital ground and slope models. The overall accuracy was higher than 90%, and the Kappa indices varied between 0.82 and 0.88. During the observation period, the mining complex expanded; for that, canga and forest vegetation was converted to mine land. At the same time, the amount of revegetated area increased. Thus, we conclude that our approach is capable of providing consistent information regarding land cover changes in mines, with a special focus on the amount of revegetation necessary to fulfill environmental liabilities.

scholarly journals MONITORING KEANEKARAGAMAN JENIS BURUNG PADA BERBAGAI TUTUPAN LAHAN DI CIBINONG SCIENCE CENTER (CSC), JAWA BARAT

2020 ◽  
Vol 19 (3B) ◽  
Author(s):  
Yohanna Dalimunthe
Keyword(s):  
Land Cover ◽  
Urban Landscape ◽  
Landsat Imagery ◽  
Community Response ◽  
Paddy Fields ◽  
Land Cover Changes ◽  
Urban Landscapes ◽  
Science Center ◽  
Landsat Images ◽  
Point Count

Birds play an essential role in ecosystems, especially in urban landscapes such as the Cibinong Science Center (CSC). As an urban landscape, CSC always experiences land cover changes due to the development of research infrastructure resulting in various human-made land cover types. This study aims to determine the diversity of birds in various types of land cover as a community response to CSC development dynamics. Bird data was collected using the point count method modified with a grid (plot) measuring 200mx200m with a radius of observation as far as 50m at 34 points. Landsat images were analyzed from 2006 to 2018 to see changes in land cover changes. The observations show that there are 35 species of birds. Among those, three birds are protected by Indonesian regulation. There are six type of land cover in CSC paddy fields, buildings, opened area, farm land, plantation, and water. CSC has total diversity S(mean) = 32 covering 65% of all recorded birds. At land cover level, building area show the highest diversity (Shannon=2.03) while paddy fields is the lowest (Shannon=1.45). Based on the Landsat imagery, there are several changes in vegetation and the addition of some buildings.   

scholarly journals Landslide Susceptibility Zonation Mapping in Post- Earthquake Scenario in Gorkha District

2018 ◽  
Vol 15 ◽  
pp. 45-56 ◽  
Author(s):  
Him Lal Shrestha ◽  
Mahesh Poudel
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Landslide Susceptibility ◽  
Remote Sensing Data ◽  
Mitigation Measures ◽  
Ordinal Scale ◽  
Slope Aspect ◽  
Landsat Images ◽  
Earthquake Scenario ◽  
Landslide Susceptibility Zonation

Landslide hazard zonation map is prepared to assist planners to implement mitigation measures so that further damage and loss can be minimized. In this study, post 25 April 2015 earthquake remote sensing data were used to prepare landslide inventory. Landsat images after the earthquake were downloaded from the National Aeronautics and Space Administration (NASA) website and processed using ArcGIS, ERDAS imagine and Analytical Hierarchy Process (AHP) as an extension in ArcGIS. The study was carried out in Gorkha district as this was the epicenter of the main earthquake of 25 April 2015 and consequently was highly affected by earthquake triggered landslide. The digital imagery was processed to analyze land use/land cover type. Geological features were analyzed using the criteria like color, tone, topography, stream drainage, etc. Primary topographic features like slope, aspect, elevation, etc. were generated from Digital Elevation Model (DEM). Seismological data (magnitude and epicenter) were obtained from Department of Seismology. For Landslide Susceptibility Zonation (LSZ) different thematic maps like Land Use and Land Cover (LULC) map, slope map, aspect map, lithological map, buffer map (distance from road and river/water source), soil map, and seismological map were assigned relative weights on the ordinal scale to obtain Landslide Susceptibility Index (LSI). Threshold values were selected according to breaks in LSI frequency and a LSZ map was prepared which shows very low, low, moderate, high, very high hazard zones in Gorkha district.

scholarly journals Perubahan lahan vegetasi berbasis citra satelit di DAS Citarum, Bandung, Jawa Barat

2021 ◽  
Vol 35 (1) ◽  
pp. 54
Author(s):  
Teguh Husodo ◽  
Yazid Ali ◽  
Siti Rodiatan Mardiyah ◽  
Sya Sya Shanida ◽  
Oekan S Abdoellah ◽  
...  
Keyword(s):  
Image Processing ◽  
Land Cover ◽  
Landsat Imagery ◽  
Remote Sensing Data ◽  
Land Cover Changes ◽  
Surrounding Area ◽  
Land Area ◽  
Change Analysis ◽  
Small Areas ◽  
Study Results

Abstrak DAS Citarum mengalami perubahan struktur lingkungan yang tinggi yang berakibat pada penurunan kualitas lingkungan, sehingga diperlukan gambaran mendetail mengenai kondisi perubahan lahan vegetasi di DAS Citarum. Tujuan dari penelitian ini untuk mengetahui proses perubahan luasan lahan vegetasi di DAS Citarum, Bandung, Jawa Barat. Penelitian ini menggunakan data penginderaan jauh dengan pendekatan kuantitatif. Pemetaan perubahan penutupan vegetasi di DAS Citarum menggunakan data citra Landsat multitemporal dengan perangkat lunak QGIS. Pada pelaksanaan penelitian ini, beberapa tahapan yang dilakukan, diantaranya pengolahan awal citra satelit (pre-processing), pengolahan citra digital (image processing), verifikasi data citra (NDVI), dan analisis perubahan penutupan lahan. Hasil studi menunjukkan bahwa terjadi penurunan luasan lahan vegetasi seluas 35% pada tahun 1989 – 2019 dengan rata-rata penyusutan luas lahan sebesar 0.64% setiap tahunnya dan penyusutan terbesar pada tahun 2006. Penyusutan lahan cenderung terjadi pada wilayah yang berbatasan dengan Kota Bandung, yang diperkirakan sebagai bagian dari pengembangan wilayah kota kedaerah sekitarnya dan hasil menunjukkan wilayah yang mengalami penyusutan terbesar merupakan kecamatan dengan luas wilayah relatif kecil dibandingkan dengan wilayah kecamatan lainnya seperti Cipatat (74%) dan Batujajar (83%). Meski demikian, selama periode tahun 1989 – 2019, beberapa kecamatan menunjukkan peningkatan luas lahan bervegetasi seperti Kecamatan Bojongsoang, Slawi, dan Tanjungsari. Kata kunci: Citra Satelit, Landsat, Penyusutan Lahan. Abstract The Citarum watershed undergoes a significant change in environmental structure, which results in a decrease in environmental quality, so a detailed description of the conditions of land change in vegetation in the Citarum watershed is needed. The main objective of this study: the process of changing the area of vegetation in the Citarum watershed, Bandung, West Java. This study uses remote sensing data with a quantitative approach. Mapping of land cover changes in the Citarum watershed uses multitemporal Landsat imagery with QGIS software. Several steps were carried out, including pre-processing, image processing, NDVI, and land cover change analysis. The study results show a decrease in the area of vegetation area of 35% in 1989 - 2019, with an average shrinkage of the land area of 0.64% annually and the most extensive shrinkage in 2006. Land shrinkage tends to occur in areas bordering Bandung City, which is estimated as part of the city's development to the surrounding area. The most extensive shrinkage areas are the districts with relatively small areas compared to other sub-districts such as Cipatat (74%) and Batujajar (83%). However, during the period 1989 - 2019, several sub-districts showed an increase in vegetated land areas, such as Bojongsoang, Slawi, and Tanjungsari Districts. 

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