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Web Maps & Data Visualisation David Kelly Digital Humanities Manager, Moore Institute @ NUI, Galway 29 March, 2018 | Digital Scholarship Workshop Series

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http://bit.ly/moore-maps-18

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http://luminocity3d.org/WorldPopDen/#4/37.37/53.17

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galwaydashboard.ie

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Dr Patrick Collins & Dr Aisling Murtagh – Geography @ NUI Galway

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https://www.nytimes.com/interactive/2016/01/07/us/drug-overdose-deaths-in-the-us.html

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https://www.shipmap.org/

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https://parallel.co.uk/3D/laei-no2

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Tools

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• Limited free plans available * Code-based alternative: • Map design • Data storage • Embed maps carto.com mapbox.com

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storymap.knightlab.com Omeka Plugin

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Anatomy of a Web Map

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- A kind of digital map, but… - Not GIS applications (Geographic Information System) - Not Google Earth-style - Not print maps - Published online - embedded - Uses Tiles - 256 x 256 pixels - A ”Slippy” map http://a.tile.openstreetmap.se/hydda/full/15/15559/10631.png

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Web maps - Zoom levels ( => number of tiles increases exponentially) http://maptime.io/anatomy-of-a-web-map https://wiki.openstreetmap.org/wiki/Zoom_levels

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Projections - Google Maps uses Mercator Projection - Works well for 2D maps * http://maptime.io/anatomy-of-a-web-map

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https://thetruesize.com/#/aboutModal?borders=1~!MTczNTA0Njk.NTIw MzQ0NA*MzQ4MDk2ODM(Nzk2MDEy~!GL*MA.MTgwMDAwMDA)MA

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Think: Layers

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Layers: Base Layer (Raster Map Tiles)

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Data Layers - Feature (content) layers on top - Vectors – points / lines / polygons - Latitude / longitude [53.27392, -9.05102] - Data used in interaction - Data can be stored as GeoJSON, Shapefiles, TopoJSON, KML, CSV - We’ll use some CSV data

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Layers - Controls - For example: Zoom, legend, layer switcher, titles, search

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Now, make a map

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We want to… - Get (and prepare) data - Create a new map and upload our data to it - Customise map markers / interaction - Change the base map - Get an embed code to publish the map on our website

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Data https://data.gov.ie/dataset/national-inventory-of-architectural- heritage-niah-national-dataset

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• REG_NO • NAME * • NUMBER • STREET1 • STREET2 • TOWN • TOWNLAND • COUNTY • COUNTY_ID • PLANAUTH • COMPOSITION * • APPRAISAL • DATEFROM * • DATETO • RATING • ORIGINAL_TYPE • X_COORD • Y_COORD • X_COORD_ITM • Y_COORD_ITM • LATITUDE * • LONGITUDE * • IMAGE_LINK • WEBSITE_LINK • SURVEY_ID • Link

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Prepare our data A free, open source, powerful tool for working with messy data openrefine.org • Clean the data to make values consistent * • Extract data we’re interested in * • Geo-code data ( https://github.com/OpenRefine/OpenRefine/wiki/Geocoding ) • If Google: Google Maps TOS, and limited to 2,500 addresses per day

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Data https://data.gov.ie/dataset/national-inventory-of-architectural- heritage-niah-national-dataset

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1. Google Maps

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https://mymaps.google.com

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http://www.davidkelly.ie/talks/nuig-mapping-2018/google-map-example/

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2. carto.com

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http://www.davidkelly.ie/talks/nuig-mapping-2018/carto-map-example/

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Thank you David Kelly [email protected] @davkell | linkedin.com/in/davkell