Whales from Space: Counting Southern Right Whales by Satellite
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{"title"=>"Whales from space: Counting southern right whales by satellite", "type"=>"journal", "authors"=>[{"first_name"=>"Peter T.", "last_name"=>"Fretwell", "scopus_author_id"=>"8785398400"}, {"first_name"=>"Iain J.", "last_name"=>"Staniland", "scopus_author_id"=>"6602212543"}, {"first_name"=>"Jaume", "last_name"=>"Forcada", "scopus_author_id"=>"7004397268"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"24533131", "doi"=>"10.1371/journal.pone.0088655", "sgr"=>"84895725448", "isbn"=>"1932-6203", "scopus"=>"2-s2.0-84895725448", "issn"=>"19326203", "pui"=>"372545331"}, "id"=>"052bca8d-5985-36d5-a46b-a1a5674536f8", "abstract"=>"We describe a method of identifying and counting whales using very high resolution satellite imagery through the example of southern right whales breeding in part of the Golfo Nuevo, Península Valdés in Argentina. Southern right whales have been extensively hunted over the last 300 years and although numbers have recovered from near extinction in the early 20(th) century, current populations are fragmented and are estimated at only a small fraction of pre-hunting total. Recent extreme right whale calf mortality events at Península Valdés, which constitutes the largest single population, have raised fresh concern for the future of the species. The WorldView2 satellite has a maximum 50 cm resolution and a water penetrating coastal band in the far-blue part of the spectrum that allows it to see deeper into the water column. Using an image covering 113 km(2), we identified 55 probable whales and 23 other features that are possibly whales, with a further 13 objects that are only detected by the coastal band. Comparison of a number of classification techniques, to automatically detect whale-like objects, showed that a simple thresholding technique of the panchromatic and coastal band delivered the best results. This is the first successful study using satellite imagery to count whales; a pragmatic, transferable method using this rapidly advancing technology that has major implications for future surveys of cetacean populations.", "link"=>"http://www.mendeley.com/research/whales-space-counting-southern-right-whales-satellite", "reader_count"=>215, "reader_count_by_academic_status"=>{"Unspecified"=>5, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>9, "Researcher"=>52, "Student > Ph. D. Student"=>47, "Student > Postgraduate"=>13, "Student > Master"=>43, "Other"=>12, "Student > Bachelor"=>23, "Lecturer"=>3, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_user_role"=>{"Unspecified"=>5, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>9, "Researcher"=>52, "Student > Ph. D. Student"=>47, "Student > Postgraduate"=>13, "Student > Master"=>43, "Other"=>12, "Student > Bachelor"=>23, "Lecturer"=>3, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_subject_area"=>{"Unspecified"=>10, "Agricultural and Biological Sciences"=>115, "Computer Science"=>5, "Earth and Planetary Sciences"=>19, "Engineering"=>6, "Environmental Science"=>46, "Biochemistry, Genetics and Molecular Biology"=>2, "Mathematics"=>2, "Medicine and Dentistry"=>1, "Design"=>1, "Sports and Recreations"=>1, "Physics and Astronomy"=>1, "Psychology"=>1, "Social Sciences"=>4, "Immunology and Microbiology"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Social Sciences"=>{"Social Sciences"=>4}, "Sports and Recreations"=>{"Sports and Recreations"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>1}, "Mathematics"=>{"Mathematics"=>2}, "Unspecified"=>{"Unspecified"=>10}, "Environmental Science"=>{"Environmental Science"=>46}, "Design"=>{"Design"=>1}, "Engineering"=>{"Engineering"=>6}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>19}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>115}, "Computer Science"=>{"Computer Science"=>5}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}}, "reader_count_by_country"=>{"Ecuador"=>1, "Argentina"=>4, "French Guiana"=>1, "United States"=>4, "United Kingdom"=>6, "Portugal"=>1, "Iceland"=>1, "India"=>1, "Greece"=>1, "Canada"=>1, "Netherlands"=>1, "Belgium"=>1, "Mexico"=>2, "South Africa"=>1, "Italy"=>1, "Chile"=>1, "France"=>1}, "group_count"=>9}

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  • {"files"=>["https://ndownloader.figshare.com/files/1382585"], "description"=>"<p>Manually identified whales (top) have been broken into three classes; shapes that are whale-like and whale-sized are classed as probable whales, other objects are classed as possible whales, but may include bubble slicks and some groups of seabirds. The third class are objects identified only in the water penetrating coastal band, these are interpreted as sub-surface feature that are potentially whales. The bottom image shows the whale-like objects identified from the thresholding analysis of the coastal band.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "manually"], "article_id"=>931515, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g005", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_between_manually_identified_and_automatically_identified_whales_/931515", "title"=>"Comparison between manually identified and automatically identified whales.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382575"], "description"=>"<p>Several of the images could be interpreted as whale pairs, or as a mother and calf, others may be displaying behaviour such as tail slapping, rolling or blowing. On several images there is a strong return at one end of the feature which is mostly likely the calluses on the whales head. Reprinted under a CC BY license with permission from British Antarctic Survey and DigitalGlobe.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "20", "colour", "chips", "probable", "whales", "automated"], "article_id"=>931509, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g002", "stats"=>{"downloads"=>1, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_A_selection_of_20_comparable_false_colour_image_chips_bands_1_8_5_of_probable_whales_found_by_the_automated_analysis_/931509", "title"=>"A selection of 20 comparable false colour image chips (bands 1-8-5) of probable whales found by the automated analysis.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382574"], "description"=>"<p>The red box denotes the area of imagery acquired for this study. The grey area gives an indication of the possible swath width of a single satellite pass.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "places", "named"], "article_id"=>931508, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g001", "stats"=>{"downloads"=>3, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_area_of_the_study_and_the_location_of_places_named_in_the_text_/931508", "title"=>"The area of the study and the location of places named in the text.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382587"], "description"=>"<p>Assessment of results from four automatic detection techniques in relation to manually digitized whales; results from two unsupervised classification techniques and two Thresholding analyses.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "detection", "techniques", "manually", "digitized", "unsupervised", "classification", "thresholding"], "article_id"=>931517, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.t001", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Assessment_of_results_from_four_automatic_detection_techniques_in_relation_to_manually_digitized_whales_results_from_two_unsupervised_classification_techniques_and_two_Thresholding_analyses_/931517", "title"=>"Assessment of results from four automatic detection techniques in relation to manually digitized whales; results from two unsupervised classification techniques and two Thresholding analyses.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382586"], "description"=>"<p>The top row shows examples of surface features that are probably bubbles from subsurface whales. Whether the whales are still under the bubble areas is difficult to ascertain. The lower row show clusters white dots, probably seabirds. Seabirds have been recorded to feed on whales at Península Valdés (see discussion). The third (and possible fourth) of these images shows a larger white object that could be a whale (or whale carcass) although once more it is impossible to tell with any certainty in this imagery. Reprinted under a CC BY license with permission from British Antarctic Survey and DigitalGlobe.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "confounding", "colour", "bands"], "article_id"=>931516, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g006", "stats"=>{"downloads"=>8, "page_views"=>20, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Examples_of_possible_confounding_features_found_in_the_image_false_colour_bands_1_8_5_/931516", "title"=>"Examples of possible confounding features found in the image (false colour bands 1-8-5).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382580"], "description"=>"<p>The left hand figure is from a feature at the surface, the right hand figure shows a submerged feature. Note that while all bands show the surface feature, only band 5 (the Coastal Band) identifies the submerged feature.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "sections", "whale-like", "assumed"], "article_id"=>931511, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g003", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_sensor_response_through_cross_sections_through_two_whale_like_correct_shape_and_size_features_assumed_to_be_whales_/931511", "title"=>"The sensor response through cross sections through two whale-like (correct shape and size) features assumed to be whales.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/1382582"], "description"=>"<p>Note that the higher resolution of the panchromatic band gives more detail, but it this increased detail also renders the object into several parts. Other bands show less detail, but have the advantage of homogenizing the object into one group of pixels, an important consideration when attempting to build automatic identification routines. Reprinted under a CC BY license with permission from British Antarctic Survey and DigitalGlobe.</p>", "links"=>[], "tags"=>["ecology", "Marine biology", "Marine conservation", "Marine ecology", "Population biology", "Population ecology", "Population metrics", "Zoology", "Mammalogy", "geoinformatics", "Remote sensing imagery", "geography", "signal processing", "Image processing", "images", "probable", "multispectral", "bands", "panchromatic", "worldview2"], "article_id"=>931512, "categories"=>["Biological Sciences", "Engineering"], "users"=>["Peter T. Fretwell", "Iain J. Staniland", "Jaume Forcada"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0088655.g004", "stats"=>{"downloads"=>3, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_A_single_band_images_of_a_probable_right_whale_in_the_satellite_image_from_each_of_the_eight_multispectral_bands_and_the_panchromatic_band_of_the_WorldView2_data_/931512", "title"=>"A single band images of a probable right whale in the satellite image from each of the eight multispectral bands and the panchromatic band of the WorldView2 data.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-02-12 03:27:26"}

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Relative Metric

{"start_date"=>"2014-01-01T00:00:00Z", "end_date"=>"2014-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences", "average_usage"=>[291]}, {"subject_area"=>"/Earth sciences/Marine and aquatic sciences", "average_usage"=>[343]}]}
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