{ "openapi": "3.1.1", "info": { "title": "GISela Coordinate Reprojection API", "version": "1.0.0", "summary": "Convert GeoJSON, KML, GPX, CSV or shapefiles between WGS 84, UTM, LV95, British Grid and more.", "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://giselareproject.usefulweb.site" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Convert GeoJSON, KML, GPX, CSV or shapefiles between WGS 84, UTM, LV95, British Grid and more.", "description": "Reprojects vector data between coordinate systems with GISela’s own projection maths: WGS 84, ETRS89, Web Mercator, every UTM zone, ETRS89-LAEA, German Gauss–Krüger zones, Swiss LV95/LV03 and the British National Grid. Reads the coordinate system from .prj files and GeoJSON, and shows sample coordinates before and after.\n\nMethodology:\n- The data is read into WGS 84 longitude/latitude, then projected to the target system. Readers: GeoJSON (also the old “crs” member), TopoJSON (arcs decoded with the transform), KML/KMZ, GPX, CSV with coordinate or WKT columns, WKT and zipped shapefiles with .prj detection by EPSG authority, name or Transverse Mercator parameters.\n- Transverse Mercator (UTM, Gauss–Krüger, British National Grid) uses Karney’s 6th-order Krüger series on the system’s own ellipsoid; ETRS89-LAEA uses the ellipsoidal Lambert azimuthal equal-area formulas of IOGP Guidance Note 7-2; LV95/LV03 use swisstopo’s rigorous oblique Mercator formulas; Web Mercator uses the spherical formulas on the WGS 84 radius.\n- Datum changes (OSGB 1936, DHDN, CH1903/CH1903+) go through geocentric coordinates with a published 7-parameter Helmert transformation. ETRS89 is treated as equal to WGS 84 (well under 1 m in Europe).\n- Outputs are rounded to 8 decimals for degrees and 3 decimals (millimetres) for metres.\n\nHelmert datum shifts are good to about 1–5 m. For survey work use the national grid transformations (OSTN15, BeTA2007, FINELTRA).", "tags": [ "apps" ], "x-mcp-tool": "gisela_reproject", "x-owner-app": "gisela", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/GiselaReprojectInput" }, "examples": { "example1": { "summary": "Tram stops (WGS 84) to Swiss LV95", "value": { "data": "{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[7.992,47.1215]},\"properties\":{\"name\":\"Weiher\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[7.999,47.126]},\"properties\":{\"name\":\"Altstadt\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[8.006,47.129]},\"properties\":{\"name\":\"Marktplatz\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[8.012,47.1335]},\"properties\":{\"name\":\"Bahnhof\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[8.018,47.137]},\"properties\":{\"name\":\"Nordring\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[8.025,47.14]},\"properties\":{\"name\":\"Rebhalde\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[8.031,47.1405]},\"properties\":{\"name\":\"Endstation Ost\"}}]}", "to": "EPSG:2056" } }, "example2": { "summary": "Five bus stops in LV95 (CSV with E/N columns) to WGS 84", "value": { "data": "stop;E;N;boardings\nBus Seefeld;2643240;1219692;640\nBus Moosmatt;2643899;1219730;410\nBus Nordwest;2642892;1220545;380\nBus Industrie;2643559;1220628;720\nBus Rebhalde;2644031;1220442;290\n", "from": "2056", "to": "EPSG:4326", "format": "csv" } }, "example3": { "summary": "District polygons to ETRS89-LAEA (equal-area Europe)", "value": { "data": "{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[7.99,47.12],[8.004,47.1205],[8.0052,47.1303],[7.9891,47.131],[7.99,47.12]]]},\"properties\":{\"name\":\"Altstadt\",\"population\":4820,\"households\":2410,\"zone\":\"mixed\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[8.004,47.1205],[8.019,47.1205],[8.0181,47.1303],[8.0052,47.1303],[8.004,47.1205]]]},\"properties\":{\"name\":\"Seefeld\",\"population\":3150,\"households\":1490,\"zone\":\"residential\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[8.019,47.1205],[8.033,47.12],[8.0342,47.131],[8.0181,47.1303],[8.019,47.1205]]]},\"properties\":{\"name\":\"Moosmatt\",\"population\":2280,\"households\":1010,\"zone\":\"residential\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[7.9891,47.131],[8.0052,47.1303],[8.004,47.1425],[7.99,47.142],[7.9891,47.131]]]},\"properties\":{\"name\":\"Bahnhof\",\"population\":3900,\"households\":2050,\"zone\":\"mixed\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[8.0052,47.1303],[8.0181,47.1303],[8.019,47.1425],[8.004,47.1425],[8.0052,47.1303]]]},\"properties\":{\"name\":\"Industrie Nord\",\"population\":640,\"households\":210,\"zone\":\"industrial\"}},{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[8.0181,47.1303],[8.0342,47.131],[8.033,47.142],[8.019,47.1425],[8.0181,47.1303]]]},\"properties\":{\"name\":\"Rebhalde\",\"population\":1720,\"households\":760,\"zone\":\"residential\"}}]}", "to": "EPSG:3035" } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/GiselaReprojectResult" } } } }, "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" } } } } } }, "GiselaReprojectInput": { "type": "object", "additionalProperties": false, "properties": { "data": { "title": "Data", "description": "GeoJSON, TopoJSON, KML, GPX, CSV (lat/lon, x/y or a WKT column) or WKT lines. Or upload a file below.", "type": "string", "maxLength": 5000000, "default": "" }, "file": { "title": "File (optional)", "description": "Used instead of the pasted text. Shapefiles: put .shp, .dbf and .prj into one ZIP. Upload as {filename, contentType?, contentBase64}. Max 19531 KiB. Accepts .geojson,.json,.topojson,.kml,.kmz,.gpx,.csv,.txt,.wkt,.zip.", "type": "object", "additionalProperties": false, "required": [ "filename", "contentBase64" ], "properties": { "filename": { "type": "string" }, "contentType": { "type": "string" }, "contentBase64": { "type": "string" } } }, "from": { "title": "Coordinate system of the data", "description": "“auto” reads it from the file (.prj, GeoJSON crs); otherwise an EPSG code such as 2056, 25832 or 27700. Without information the data is read as WGS 84 longitude/latitude.", "type": "string", "maxLength": 20, "default": "auto" }, "to": { "title": "Convert to", "description": "Other zones: type the code below.", "type": "string", "enum": [ "EPSG:4326", "EPSG:4258", "EPSG:3857", "EPSG:3035", "EPSG:2056", "EPSG:21781", "EPSG:27700", "EPSG:31466", "EPSG:31467", "EPSG:31468", "EPSG:31469", "EPSG:25831", "EPSG:25832", "EPSG:25833" ], "default": "EPSG:4326" }, "toOther": { "title": "Or another EPSG code", "description": "For example 32633 (WGS 84 / UTM 33N) or 25831. Overrides the list when filled.", "type": "string", "maxLength": 20, "default": "" }, "format": { "title": "Output format", "type": "string", "enum": [ "geojson", "csv", "wkt" ], "default": "geojson" } }, "required": [] }, "GiselaReprojectResult": { "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" }, "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" } } } } } } } }