{ "openapi": "3.1.1", "info": { "title": "Geo Data Visualizer API", "version": "1.0.0", "summary": "Map CSV coordinates or GeoJSON as points, proportional circles, hex-bin heatmaps or choropleths.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://geodatavisualizer.usefulweb.site" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Map CSV coordinates or GeoJSON as points, proportional circles, hex-bin heatmaps or choropleths.", "description": "Upload a CSV/XLSX with latitude/longitude (plus optional value and label) or a country-code column, or a GeoJSON file with points, lines and polygons. Get an SVG map over bundled Natural Earth country outlines in the Equal Earth, Mercator or equirectangular projection – as points, proportional symbols, a hexagonal-bin heatmap or a choropleth – zoomed to your data, with SVG/PNG downloads.\n\nMethodology:\n- Input detection: text starting with \"{\" is read as GeoJSON (FeatureCollection, Feature or bare geometry; Point, MultiPoint, LineString, MultiLineString, Polygon, MultiPolygon, GeometryCollection). Anything else is a table (CSV/TSV/XLSX); lat/lon and country columns are found by name unless you name them.\n- Coordinates must be WGS 84 decimal degrees (longitude −180…180, latitude −90…90); rows outside the range or without numbers are skipped and counted.\n- Projections: equirectangular x = λ, y = φ; Mercator y = ln tan(π/4 + φ/2) (clipped at ±85°); Equal Earth (Šavrič, Patterson & Jenny 2018), an equal-area projection suitable for world maps and for comparing densities.\n- Auto zoom fits the bounding box of the data plus 20 % margin (at least 4° × 3°); views wider than 300° of longitude show the whole world.\n- Hex-bin heatmap: points are projected, assigned to pointy-top hexagons of the chosen pixel size (cube-coordinate rounding) and coloured by count, or by the sum of the value column, on a colour-blind-safe viridis-like ramp.\n- Proportional circles: circle area is proportional to |value| (radius ∝ √value, largest 26 px); larger circles are drawn first so small ones stay visible. Choropleth: country codes/names are matched to the bundled outlines and shaded in up to five quantile classes; unmatched entries are listed.\n- Country outlines are Natural Earth 1:110m (public domain): small countries and islands such as Singapore, Malta or Andorra are not part of this scale and cannot be shaded. Borders follow Natural Earth’s de facto conventions and are not a statement on disputed territories.", "tags": [ "charts" ], "x-mcp-tool": "geo_data_visualizer", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/GeoDataVisualizerInput" }, "examples": { "example1": { "summary": "Offices as proportional circles (staff, example data)", "value": { "data": "office,lat,lon,staff\nTokyo,35.68,139.69,42\nDelhi,28.61,77.21,18\nShanghai,31.23,121.47,25\nSão Paulo,-23.55,-46.63,12\nMexico City,19.43,-99.13,9\nCairo,30.04,31.24,6\nMumbai,19.08,72.88,21\nNairobi,-1.29,36.82,7\nNew York,40.71,-74.01,55\nLagos,6.52,3.38,8\nParis,48.86,2.35,31\nLondon,51.51,-0.13,47\nBerlin,52.52,13.40,26\nToronto,43.65,-79.38,14\nSydney,-33.87,151.21,11", "mode": "proportional", "valueColumn": "staff", "labelColumn": "office", "zoom": "world", "title": "Staff per office (example data)" } }, "example2": { "summary": "Choropleth by ISO code or country name", "value": { "data": "country,customers\nUS,420\nDE,310\nFR,180\nGB,220\nES,95\nIT,120\nNL,85\nPL,60\nSE,45\nBR,70\nMX,40\nCA,110\nJP,130\nIN,75\nAU,65\nZA,20\nKE,12\nNorway,30\nCzechia,25\nPRT,33", "mode": "choropleth", "title": "Customers by country (example data)", "png": false } }, "example3": { "summary": "GeoJSON points, a route and an area (Mercator)", "value": { "data": "{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"properties\":{\"name\":\"Lisbon\"},\"geometry\":{\"type\":\"Point\",\"coordinates\":[-9.14,38.72]}},{\"type\":\"Feature\",\"properties\":{\"name\":\"Madrid\"},\"geometry\":{\"type\":\"Point\",\"coordinates\":[-3.7,40.42]}},{\"type\":\"Feature\",\"properties\":{\"name\":\"Barcelona\"},\"geometry\":{\"type\":\"Point\",\"coordinates\":[2.17,41.39]}},{\"type\":\"Feature\",\"properties\":{\"name\":\"Route\"},\"geometry\":{\"type\":\"LineString\",\"coordinates\":[[-9.14,38.72],[-3.7,40.42],[2.17,41.39]]}},{\"type\":\"Feature\",\"properties\":{\"name\":\"Study area\"},\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-6,37],[-2,37],[-2,39.5],[-6,39.5],[-6,37]]]}}]}", "projection": "mercator", "png": false } }, "example4": { "summary": "Hex-bin density of the same offices", "value": { "data": "office,lat,lon,staff\nTokyo,35.68,139.69,42\nDelhi,28.61,77.21,18\nShanghai,31.23,121.47,25\nSão Paulo,-23.55,-46.63,12\nMexico City,19.43,-99.13,9\nCairo,30.04,31.24,6\nMumbai,19.08,72.88,21\nNairobi,-1.29,36.82,7\nNew York,40.71,-74.01,55\nLagos,6.52,3.38,8\nParis,48.86,2.35,31\nLondon,51.51,-0.13,47\nBerlin,52.52,13.40,26\nToronto,43.65,-79.38,14\nSydney,-33.87,151.21,11", "mode": "hexbin", "hexRadius": 20, "zoom": "world", "png": false } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/GeoDataVisualizerResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "GeoDataVisualizerInput": { "type": "object", "additionalProperties": false, "properties": { "file": { "title": "CSV, Excel or GeoJSON file", "description": "Max 20 MB. CSV/XLSX: lat/lon columns or a country column (ISO code or English name). GeoJSON: Point, LineString, Polygon (and Multi-) geometries. Upload as {filename, contentType?, contentBase64}. Max 20480 KiB. Accepts .csv,.tsv,.txt,.xlsx,.geojson,.json,text/csv,application/geo+json,application/json,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.", "type": "object", "additionalProperties": false, "required": [ "filename", "contentBase64" ], "properties": { "filename": { "type": "string" }, "contentType": { "type": "string" }, "contentBase64": { "type": "string" } } }, "data": { "title": "Or paste data", "description": "CSV with a header row, or GeoJSON.", "type": "string", "maxLength": 2000000 }, "mode": { "title": "Map type", "type": "string", "enum": [ "auto", "points", "proportional", "hexbin", "choropleth" ], "default": "auto" }, "projection": { "title": "Projection", "type": "string", "enum": [ "equal-earth", "mercator", "equirectangular" ], "default": "equal-earth" }, "latColumn": { "title": "Latitude column", "description": "Empty: a column named lat/latitude.", "type": "string", "maxLength": 200 }, "lonColumn": { "title": "Longitude column", "description": "Empty: a column named lon/lng/longitude.", "type": "string", "maxLength": 200 }, "valueColumn": { "title": "Value column / property", "description": "Numbers for circle size, hex sums or choropleth shading. Empty: the first numeric column (or a \"value\" property in GeoJSON).", "type": "string", "maxLength": 200 }, "labelColumn": { "title": "Label column / property", "type": "string", "maxLength": 200 }, "countryColumn": { "title": "Country column (choropleth)", "description": "ISO 3166 alpha-2/alpha-3 codes or English country names.", "type": "string", "maxLength": 200 }, "zoom": { "title": "Extent", "type": "string", "enum": [ "auto", "world" ], "default": "auto" }, "hexRadius": { "title": "Hexagon size", "type": "integer", "minimum": 4, "maximum": 60, "default": 14, "x-unit": "px" }, "title": { "title": "Map title", "type": "string", "maxLength": 140 }, "png": { "title": "Also create a PNG image", "type": "boolean", "default": true } }, "required": [] }, "GeoDataVisualizerResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object", "additionalProperties": false, "required": [ "mode", "projection", "view", "points", "lines", "polygons", "countriesMatched", "unmatched", "invalidRows", "hexbins", "classes", "width", "height", "svg", "png" ], "properties": { "mode": { "type": "string" }, "projection": { "type": "string" }, "view": { "type": "object", "additionalProperties": false, "required": [ "west", "south", "east", "north" ], "properties": { "west": { "type": "number" }, "south": { "type": "number" }, "east": { "type": "number" }, "north": { "type": "number" } } }, "points": { "type": "integer" }, "lines": { "type": "integer" }, "polygons": { "type": "integer" }, "countriesMatched": { "type": "integer" }, "unmatched": { "type": "array", "items": { "type": "string" } }, "invalidRows": { "type": "integer" }, "hexbins": { "type": "integer" }, "classes": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "from", "to", "color", "countries" ], "properties": { "from": { "type": "number" }, "to": { "type": "number" }, "color": { "type": "string" }, "countries": { "type": "integer" } } } }, "width": { "type": "integer" }, "height": { "type": "integer" }, "svg": { "type": "object", "additionalProperties": false, "required": [ "artifactId", "filename", "mime", "bytes", "sha256", "path" ], "properties": { "artifactId": { "type": "string" }, "filename": { "type": "string" }, "mime": { "type": "string" }, "bytes": { "type": "integer" }, "sha256": { "type": "string" }, "path": { "type": "string", "description": "Download path on the same site (valid for about 2 hours)." } } }, "png": { "anyOf": [ { "type": "object", "additionalProperties": false, "required": [ "artifactId", "filename", "mime", "bytes", "sha256", "path" ], "properties": { "artifactId": { "type": "string" }, "filename": { "type": "string" }, "mime": { "type": "string" }, "bytes": { "type": "integer" }, "sha256": { "type": "string" }, "path": { "type": "string", "description": "Download path on the same site (valid for about 2 hours)." } } }, { "type": "null" } ] } } }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }