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Application Effect Analysis of Image Fusion Methods for Extraction of Shoreline in Coastal Zone Using Landsat ETM+
Jo Jong-Song,
Cha Jong-Hun
Issue:
Volume 1, Issue 1, December 2017
Pages:
1-6
Received:
24 September 2016
Accepted:
14 November 2016
Published:
21 December 2016
DOI:
10.11648/j.ijaos.20170101.11
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Abstract: Extraction of shoreline incoastal zone is important for coast protection and management. This paper presents extractingthe shoreline with fusion images, which are obtained using various image fusion methods such as IHStransform, Brovey Transform, Multiplicative, Principle Component, Wavelet Resolution Merge. Artificial constructions (e.g. coastalembankments), islands, lakes, tidal mudflats and estuaries have been selected as evaluation objects, shorelines of which are extracted and analyzed. The result indicates that shoreline extraction effect by the Principle Component method is bestamong other methods.
Abstract: Extraction of shoreline incoastal zone is important for coast protection and management. This paper presents extractingthe shoreline with fusion images, which are obtained using various image fusion methods such as IHStransform, Brovey Transform, Multiplicative, Principle Component, Wavelet Resolution Merge. Artificial constructions (e.g. coastalem...
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The Challenges of River Bathymetry Survey Using Space Borne Remote Sensing in Bangladesh
Md. Shafiqul Islam Khondoker,
Md. Zahid Hasan Siddiquee,
Md. Ashraful Islam
Issue:
Volume 1, Issue 1, December 2017
Pages:
7-13
Received:
16 November 2016
Accepted:
16 December 2016
Published:
16 January 2017
DOI:
10.11648/j.ijaos.20170101.12
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Abstract: Over the last two decades there has been a revolution in our ability to map and monitor large areas of subaerial topography using technologies such as radar and near-infrared Light Detection and Ranging. The Multispectral Remote Sensing (RS) Satellite ‘WorldView-2’ imagery has the ability to measure water depth up to 25m. Studies have been conducted based on the band ratio algorithm to determine water depth in the study area the Ganges River in Bangladesh. This method is able to generate accurate depth measurements at points or along transects, and also offer more flexible, efficient and cost-effective means of mapping bathymetry over broad areas. There are two methods are available to derive bathymetry from remote sensing imagery which are “linear method” and “ratio method”. The linear method is depended upon bottom type albedo. While different bottom types at the same depth would be incorrectly calculated for one of these two substrates. The accuracy of the retrieved bathymetry varies with water depth, with the accuracy substantially lower at a depth beyond 12 m. Other influential factors and challenges include water turbidity and bottom materials, as well as image properties.
Abstract: Over the last two decades there has been a revolution in our ability to map and monitor large areas of subaerial topography using technologies such as radar and near-infrared Light Detection and Ranging. The Multispectral Remote Sensing (RS) Satellite ‘WorldView-2’ imagery has the ability to measure water depth up to 25m. Studies have been conducte...
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Maize (Zea Mays L.) Productivity in Moist Mid-Highlands of Ethiopia Under Projected Climate Change: A Case Study of Ambo District
Fikadu Getachew,
Mezgebu Getnet,
Robel Takele,
Eshetu Zewdu
Issue:
Volume 1, Issue 1, December 2017
Pages:
14-20
Received:
22 December 2016
Accepted:
18 January 2017
Published:
27 February 2017
DOI:
10.11648/j.ijaos.20170101.13
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Abstract: Decision Support System for Agrotechnology Transfer (DSSAT) was calibrated and evaluated to simulate maize (zea mays L.) var. BH660 under current and future climate in Ethiopia under moist mid-highlands of Ethiopia around Ambo Zuria district. Simulations for both current and future periods were run assuming present technology, current varieties and current agronomy packages to investigate rain-fed Maize yield responses. Simulations was made using downscaled weather data from five General Circulation Models (GCMs) under the Coupled Model Inter-comparison Project phase 5 (CMIP5) and two Representative Concentration Pathway (RCP 4.5 and 8.5) by mid-century show a mixture of increase and decrease in median Maize yields. Five GCMs project yields to increase by 5% - 23.0% and one GCM show a decrease by 2% - 9%. Model simulations under the remaining three GCMs give contrasting results of increase and decrease.
Abstract: Decision Support System for Agrotechnology Transfer (DSSAT) was calibrated and evaluated to simulate maize (zea mays L.) var. BH660 under current and future climate in Ethiopia under moist mid-highlands of Ethiopia around Ambo Zuria district. Simulations for both current and future periods were run assuming present technology, current varieties and...
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Effect of Varying Species Ratios of Silver Carp on the Growth Performance of Mrigal and Grass Carp in Semi Intensive Pond Culture System
Farkhanda Asad,
Ammara Behzad
Issue:
Volume 1, Issue 1, December 2017
Pages:
21-25
Received:
9 January 2017
Accepted:
9 March 2017
Published:
12 April 2017
DOI:
10.11648/j.ijaos.20170101.14
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Abstract: The present project was conducted to determine whether difference in stocking ratio of silver carps can affect the growth performance of mrigal and grass carp. Fingerlings of Ctenopharyndon idella, Hypophthalmicthys molitrix and Cirrhinus mrigala were stocked at the ratio of 15:45:45 and 15:45:30 in fertilized experimental pond 1 and 2 with two replicates. Results showed that stocking ratio, species combination and fortnights had significant effect on growth of fish (P<0.01). In pond 1, grass carp gained significantly higher body weight, followed by mrigal and silver carp (322g, 282g and 260g), while in pond 2 silver carp gained higher body weight followed by mrigal and grass carp (400g, 299g and 248g). Results showed that, pond 1 stocked with higher ratio of silver carp gave higher production of grass carp while, pond 2 stocked with lower ratio of silver carp produce higher production of mrigal. Overall net fish production of pond 1 (4036.52 kg) and pond 2 (4207.88kg) statistically varied non significant. From the production point of view it was concluded that high stocking of silver carp to grass carp ponds is a better proposition than to add it to mrigal ponds. Most of the ecological parameters showed highly significant seasonal differences but remained favorable during whole period of study.
Abstract: The present project was conducted to determine whether difference in stocking ratio of silver carps can affect the growth performance of mrigal and grass carp. Fingerlings of Ctenopharyndon idella, Hypophthalmicthys molitrix and Cirrhinus mrigala were stocked at the ratio of 15:45:45 and 15:45:30 in fertilized experimental pond 1 and 2 with two rep...
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