Kite Aerial Photography for Low-Cost, Ultra-high Spatial Resolution Multi-Spectral Mapping of Intertidal Landscapes
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{"title"=>"Kite Aerial Photography for Low-Cost, Ultra-high Spatial Resolution Multi-Spectral Mapping of Intertidal Landscapes", "type"=>"journal", "authors"=>[{"first_name"=>"Mitch", "last_name"=>"Bryson", "scopus_author_id"=>"56249968800"}, {"first_name"=>"Matthew", "last_name"=>"Johnson-Roberson", "scopus_author_id"=>"23008918800"}, {"first_name"=>"Richard J.", "last_name"=>"Murphy", "scopus_author_id"=>"35471140300"}, {"first_name"=>"Daniel", "last_name"=>"Bongiorno", "scopus_author_id"=>"55642193800"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"sgr"=>"84884402703", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0073550", "pmid"=>"24069206", "pui"=>"369857695", "scopus"=>"2-s2.0-84884402703", "isbn"=>"1932-6203"}, "id"=>"0352a56f-c6c4-3c44-9ffb-375552408ca2", "abstract"=>"Intertidal ecosystems have primarily been studied using field-based sampling; remote sensing offers the ability to collect data over large areas in a snapshot of time that could complement field-based sampling methods by extrapolating them into the wider spatial and temporal context. Conventional remote sensing tools (such as satellite and aircraft imaging) provide data at limited spatial and temporal resolutions and relatively high costs for small-scale environmental science and ecologically-focussed studies. In this paper, we describe a low-cost, kite-based imaging system and photogrammetric/mapping procedure that was developed for constructing high-resolution, three-dimensional, multi-spectral terrain models of intertidal rocky shores. The processing procedure uses automatic image feature detection and matching, structure-from-motion and photo-textured terrain surface reconstruction algorithms that require minimal human input and only a small number of ground control points and allow the use of cheap, consumer-grade digital cameras. The resulting maps combine imagery at visible and near-infrared wavelengths and topographic information at sub-centimeter resolutions over an intertidal shoreline 200 m long, thus enabling spatial properties of the intertidal environment to be determined across a hierarchy of spatial scales. Results of the system are presented for an intertidal rocky shore at Jervis Bay, New South Wales, Australia. Potential uses of this technique include mapping of plant (micro- and macro-algae) and animal (e.g. gastropods) assemblages at multiple spatial and temporal scales.", "link"=>"http://www.mendeley.com/research/kite-aerial-photography-lowcost-ultrahigh-spatial-resolution-multispectral-mapping-intertidal-landsc", "reader_count"=>131, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>4, "Researcher"=>32, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>27, "Student > Postgraduate"=>6, "Student > Master"=>28, "Other"=>8, "Student > Bachelor"=>12, "Lecturer"=>2, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>4, "Researcher"=>32, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>27, "Student > Postgraduate"=>6, "Student > Master"=>28, "Other"=>8, "Student > Bachelor"=>12, "Lecturer"=>2, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>9, "Agricultural and Biological Sciences"=>31, "Arts and Humanities"=>1, "Business, Management and Accounting"=>1, "Computer Science"=>5, "Earth and Planetary Sciences"=>32, "Economics, Econometrics and Finance"=>1, "Engineering"=>7, "Environmental Science"=>36, "Medicine and Dentistry"=>1, "Neuroscience"=>1, "Design"=>1, "Sports and Recreations"=>1, "Social Sciences"=>4}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Social Sciences"=>{"Social Sciences"=>4}, "Sports and Recreations"=>{"Sports and Recreations"=>1}, "Unspecified"=>{"Unspecified"=>9}, "Environmental Science"=>{"Environmental Science"=>36}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Design"=>{"Design"=>1}, "Engineering"=>{"Engineering"=>7}, "Neuroscience"=>{"Neuroscience"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>32}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>31}, "Computer Science"=>{"Computer Science"=>5}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>1}}, "reader_count_by_country"=>{"United States"=>1, "Japan"=>1, "Ukraine"=>1, "United Kingdom"=>2, "Switzerland"=>2, "Canada"=>1, "Czech Republic"=>1, "Belgium"=>1, "Brazil"=>3, "South Africa"=>1, "Italy"=>1, "Australia"=>5, "Chile"=>2, "Germany"=>1}, "group_count"=>6}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1210713"], "description"=>"<p>Overview of software implementations used within the processing procedure.</p>", "links"=>[], "tags"=>["implementations"], "article_id"=>804222, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.t002", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Overview_of_software_implementations_used_within_the_processing_procedure_/804222", "title"=>"Overview of software implementations used within the processing procedure.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210710"], "description"=>"<p>Predicted NDVI values were derived using knowledge of coverage type reflectance spectra and camera spectral response functions (see <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0073550#pone-0073550-g003\" target=\"_blank\">Figure 3</a>). Measured NDVI values correspond to manually extracted image patches taken from the reconstructed NDVI mosaic maps (error bars show the standard deviation from multiple sample points).</p>", "links"=>[], "tags"=>["normalised", "vegetation", "intertidal"], "article_id"=>804219, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g012", "stats"=>{"downloads"=>0, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_predicted_and_measured_Normalised_Difference_Vegetation_Index_NDVI_values_for_different_intertidal_zone_coverage_types_/804219", "title"=>"Comparison of predicted and measured Normalised Difference Vegetation Index (NDVI) values for different intertidal zone coverage types.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210673"], "description"=>"<p>During data acquisition, ground control points are placed in the environment and images collected over the the terrain using the kite and camera. After data acquisition, images are processed to extract and match features across multiple overlapping images. These features are used to reconstruct the poses from which images were captured and a 3D pointcloud of the terrain using a structure-from-motion algorithm. The pointcloud is geo-referenced using the ground control points and a photo-texturing process is used to create 3D topographic maps and high-resolution geo-mosaics.</p>", "links"=>[], "tags"=>["kite-based"], "article_id"=>804201, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g004", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Overview_of_the_kite_based_mapping_process_/804201", "title"=>"Overview of the kite-based mapping process.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210709"], "description"=>"<p>Example mosaic imagery highlighting some of the dominant surface types compared in this study.</p>", "links"=>[], "tags"=>["mosaic", "imagery", "highlighting", "types", "compared"], "article_id"=>804218, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g011", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Example_mosaic_imagery_highlighting_some_of_the_dominant_surface_types_compared_in_this_study_/804218", "title"=>"Example mosaic imagery highlighting some of the dominant surface types compared in this study.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210671"], "description"=>"<p>(a) Spectral response functions for the colour and near-infrared converted cameras: the red, green and blue channels correspond to the three channels of the colour camera whereas the near-infrared curve corresponds to the red channel of the near-infrared converted camera, which was found to have the highest response of each of the channels for this camera. (b) Reflectance spectra for key surface coverage types in the intertidal zone measured using a handheld spectroradiometer. The reflectance spectra were used in conjunction with the camera spectral response functions to validate the measured colour of objects in the kite-based imagery.</p>", "links"=>[], "tags"=>["calibration"], "article_id"=>804199, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g003", "stats"=>{"downloads"=>1, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Spectral_calibration_data_/804199", "title"=>"Spectral calibration data.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210704"], "description"=>"<p>(a) 3D oblique view of the shoreline, (b) and (c) Detailed oblique views of rock platform section from different viewing angles. The level-of-detail visualisation system allows for different model scales to be visualised in a single, continuous terrain model.</p>", "links"=>[], "tags"=>["photo-textured", "rocky"], "article_id"=>804213, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g009", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_3D_photo_textured_rocky_shore_reconstruction_/804213", "title"=>"3D photo-textured rocky shore reconstruction.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210667"], "description"=>"<p>(a) 2.7 m wingspan conynes-delta kite using to lift (b) a Picavet suspension rig that was used to attach each of the two downwards-facing Sony NEX-5 digital cameras (one colour and one near-infrared). The operator walks the kite across the intertidal zone collecting multiple, overlapping photographs. Examples of aerial images collected from an altitude of approximately 15 m are shown in colour (c) and near-infrared (d).</p>", "links"=>[], "tags"=>[], "article_id"=>804195, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g002", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Kite_based_image_acquisition_/804195", "title"=>"Kite-based image acquisition.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210700"], "description"=>"<p>(a) Elevation above maximum low tide (b) slope of the terrain and (c) aspect of the terrain.</p>", "links"=>[], "tags"=>["derived", "3d", "topographic"], "article_id"=>804209, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g007", "stats"=>{"downloads"=>1, "page_views"=>11, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Elevation_slope_and_aspect_data_derived_from_the_3D_topographic_reconstruction_/804209", "title"=>"Elevation, slope and aspect data derived from the 3D topographic reconstruction.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210680"], "description"=>"<p>(a) Colour mosaic and (b) near-infrared mosaic for the whole shoreline. (c) and (d) show a detailed section of the colour and near-infrared mosaics illustrating the different scales achieved across the entire map.</p>", "links"=>[], "tags"=>["near-infrared", "photomosaic", "layers", "intertidal", "rocky", "reconstruction", "greenfields"], "article_id"=>804208, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g006", "stats"=>{"downloads"=>0, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Colour_and_near_infrared_photomosaic_layers_of_the_intertidal_rocky_shore_reconstruction_at_Greenfields_Beach_/804208", "title"=>"Colour and near-infrared photomosaic layers of the intertidal rocky shore reconstruction at Greenfields Beach.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210712"], "description"=>"<p>The red, green and blue values correspond to the three channels of the colour camera whereas the near-infrared value corresponds to the red channel of the near-infrared converted camera.</p>", "links"=>[], "tags"=>["colour", "near-infrared", "converted"], "article_id"=>804221, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.t001", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Peak_response_values_of_the_colour_and_near_infrared_converted_cameras_/804221", "title"=>"Peak response values of the colour and near-infrared converted cameras.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210678"], "description"=>"<p>Shown are two overlapping images (image 1 and image 2) with annotated positions of SIFT features that have been matched between the two images (blue) and lines displaying the computed correspondence between points (green) (only every hundredth correspondence shown for clarity). Also shown are detailed sections of each image illustrating the feature points.</p>", "links"=>[], "tags"=>["extracted", "matched", "sift"], "article_id"=>804206, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g005", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Example_of_extracted_and_matched_SIFT_image_feature_data_/804206", "title"=>"Example of extracted and matched SIFT image feature data.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210711"], "description"=>"<p>Measures of both global and local-scale (fine-scale) spatial map errors from Ground Control Point (GCP) residual errors.</p>", "links"=>[], "tags"=>["local-scale", "spatial", "errors", "residual"], "article_id"=>804220, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.t004", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Measures_of_both_global_and_local_scale_fine_scale_spatial_map_errors_from_Ground_Control_Point_GCP_residual_errors_/804220", "title"=>"Measures of both global and local-scale (fine-scale) spatial map errors from Ground Control Point (GCP) residual errors.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210707"], "description"=>"<p>(a) NDVI map for entire shoreline, (b) detailed view of NDVI and (c) corresponding colour imagery of detailed section.</p>", "links"=>[], "tags"=>["vegetation", "maps", "derived", "colour", "near-infrared"], "article_id"=>804216, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g010", "stats"=>{"downloads"=>0, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Normalised_Difference_Vegetation_Index_NDVI_maps_derived_from_raw_colour_and_near_infrared_imagery_/804216", "title"=>"Normalised Difference Vegetation Index (NDVI) maps derived from raw colour and near-infrared imagery.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210714"], "description"=>"<p>Comparison of the number of matching image pairs and average feature matches per image for colour-to-colour, colour-to-near-infrared and near-infrared-to-near-infrared image pairs.</p>", "links"=>[], "tags"=>["matching", "pairs", "matches", "colour-to-near-infrared", "near-infrared-to-near-infrared"], "article_id"=>804223, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.t003", "stats"=>{"downloads"=>2, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_the_number_of_matching_image_pairs_and_average_feature_matches_per_image_for_colour_to_colour_colour_to_near_infrared_and_near_infrared_to_near_infrared_image_pairs_/804223", "title"=>"Comparison of the number of matching image pairs and average feature matches per image for colour-to-colour, colour-to-near-infrared and near-infrared-to-near-infrared image pairs.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210702"], "description"=>"<p>(a) Elevation above maximum low tide and (b) slope of the terrain.</p>", "links"=>[], "tags"=>["views", "elevation", "derived", "3d", "topographic"], "article_id"=>804211, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g008", "stats"=>{"downloads"=>0, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Detailed_views_of_elevation_and_slope_data_derived_from_the_3D_topographic_reconstruction_/804211", "title"=>"Detailed views of elevation and slope data derived from the 3D topographic reconstruction.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/1210662"], "description"=>"<p>(a) Intertidal rocky shore at Greenfields Beach (study site shown in red box) at Jervis Bay, New South Wales, Australia, (b) ground-based photography at the study site taken at low-tide. Google maps imagery of the site is available at: <a href=\"http://maps.google.com.au/?ll=-35.085668,150.693294&spn=0.005759,0.0109&t=h&z=17\" target=\"_blank\">http://maps.google.com.au/?ll=-35.085668,150.693294&spn=0.005759,0.0109&t=h&z=17</a>.</p>", "links"=>[], "tags"=>[], "article_id"=>804191, "categories"=>["Information And Computing Sciences", "Earth and Environmental Sciences"], "users"=>["Mitch Bryson", "Matthew Johnson-Roberson", "Richard J. Murphy", "Daniel Bongiorno"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0073550.g001", "stats"=>{"downloads"=>0, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Study_Site_/804191", "title"=>"Study Site.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-09-19 03:17:20"}

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Relative Metric

{"start_date"=>"2013-01-01T00:00:00Z", "end_date"=>"2013-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences", "average_usage"=>[269, 466, 588, 697, 800, 896, 988, 1076, 1165, 1254, 1340, 1417]}, {"subject_area"=>"/Biology and life sciences/Ecology", "average_usage"=>[290, 478, 601, 716, 816, 914, 1016, 1112, 1203, 1285, 1373, 1451, 1516]}, {"subject_area"=>"/Computer and information sciences", "average_usage"=>[297, 488, 616, 724, 828, 939, 1038, 1127, 1223, 1311, 1393, 1479, 1556]}, {"subject_area"=>"/Earth sciences/Geography", "average_usage"=>[285, 472, 614, 714, 817, 928, 1028, 1122, 1225, 1327, 1410, 1482, 1549]}, {"subject_area"=>"/Ecology and environmental sciences/Ecology", "average_usage"=>[298, 487, 610, 722, 827, 929, 1029, 1125, 1217, 1306, 1388, 1464, 1535]}, {"subject_area"=>"/Engineering and technology/Equipment", "average_usage"=>[246, 440, 558, 647, 746, 842, 937, 1028, 1116, 1191, 1253, 1348, 1420]}]}
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