Geospatial Web Tools - DigitalTopographyStudios/coords GitHub Wiki
GeoJSON
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geojson.net - Quick, simple tool for creating, viewing, and sharing maps with GeoJSON.
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GeoJSON.io - Edit geojson in the browser.
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GeoJSON Lint - GeoJSON validator and linter in the browser
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GeoJSON Maps - Create simplified GeoJSON regions in the browser
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Awesome GeoJSON - Awesome list by @tmcw
Other
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GeoTIFF.io - Open source geotiff raster-processing in browser
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cog-explorer - Visually inspect individual Cloud Optimized GeoTIFFs (COGs) in the browser.
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Tile Calculator BETA - Web tiles calculator from Geofabrik
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Kepler.gl - Kepler.gl is a powerful open source geospatial analysis tool made by Uber for large-scale data sets.
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Geocontext Profiler - Create topographic profiles
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ColorBrewer2 - color advice for cartography
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Terria.io / Terria.js - An open-source framework for web-based geospatial catalog explorers
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Wicket - A lightweight Javascript library that reads and writes Well-Known Text (WKT) strings.
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First Draft GIS - First Draft GIS is a completely open source website that automatically generates the first draft of a map for you.
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epsg.io - Find a coordinate system and get position on a map.
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Map Board - Realtime map collaboration tool
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OSM BBOX Tool - Draw and edit a bounding box to get parameter formats for various OSM tools
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OSM Cha - OpenStreetMap Changeset Analyser is a web tool to help visualize and analyse edits made by mappers on OpenStreetMap (OSM).
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transitland/mobility-explorer - Understand transportation networks around the world using Transitland open data and Valhalla routing engine APIs. mobility-explorer.netlify.com
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steepless - Visualize elevation changes between two points
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Datamaps.co - A free and simple platform for creating visualizations with data maps. It allows you to upload CSV file with region data, and fully customize your map's appearance. Your map chart can be saved as PNG or SVG.
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SHIFTED MAPS - Visualizes personal movement data showing visited places and their connections.