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Rein van 't Veer
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Nov 6, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,69 +1,69 @@ | ||
| function wktToGeoJSON(wkt) { | ||
| //convert well-known text to GeoJSON | ||
| var geometryType; | ||
|
|
||
| //find substring left of first "(" occurrence | ||
| switch(wkt.substr(0, wkt.indexOf("("))){ | ||
| case "POINT": | ||
| geometryType = "Point"; | ||
| break; | ||
| case "MULTIPOINT": | ||
| geometryType = "MultiPoint"; | ||
| break; | ||
| case "LINE": | ||
| geometryType = "Line"; | ||
| break; | ||
| case "MULTILINE": | ||
| geometryType = "MultiLine"; | ||
| break; | ||
| case "POLYGON": | ||
| geometryType = "Polygon"; | ||
| break; | ||
| case "MULTIPOLYGON": | ||
| geometryType = "MultiPolygon"; | ||
| break; | ||
| case "GEOMETRYCOLLECTION": | ||
| geometryType = "GeometryCollection"; | ||
| break; | ||
| default: | ||
| //invalid wkt! | ||
| return {}; | ||
| } | ||
| //chop off geometry type, already have that | ||
| var coordinates = wkt.substr(wkt.indexOf("("), wkt.length); | ||
| //add extra [ and replace ( by [ | ||
| coordinates = "[" + coordinates.split("(").join("["); | ||
| //replace ) by ] and add extra ] | ||
| coordinates = coordinates.split(")").join("]") + "]"; | ||
| //replace , by ],[ | ||
| coordinates = coordinates.split(",").join("],["); | ||
| //replace spaces with , | ||
| coordinates = coordinates.split(" ").join(","); | ||
| //SPARQL-GeoJSON v.0.2-alpha | ||
| function sparqlToGeoJSON(sparqlJSON) { | ||
| 'use strict'; | ||
| var bindingindex, varindex, geometryType, wkt, coordinates, property; | ||
| var geojson = { | ||
| "type": "FeatureCollection", | ||
| "features": [] | ||
| }; | ||
|
|
||
| return { | ||
| "type": "Feature", | ||
| "geometry": { | ||
| "type": geometryType, | ||
| "coordinates": eval('(' + coordinates + ')') | ||
| }, | ||
| //todo: construct properties from sparql+json | ||
| "properties": {} | ||
| }; | ||
| } | ||
| for (bindingindex = 0; bindingindex < sparqlJSON.results.bindings.length; ++bindingindex) { | ||
| for (varindex = 0; varindex < sparqlJSON.head.vars.length; ++varindex) { | ||
| if (sparqlJSON.results.bindings[bindingindex][sparqlJSON.head.vars[varindex]].datatype === "http://www.opengis.net/ont/geosparql#wktLiteral") { | ||
| //assumes the well-known text is valid! | ||
| wkt = sparqlJSON.results.bindings[bindingindex][sparqlJSON.head.vars[varindex]].value; | ||
|
|
||
| function sparqlToGeoJSON(sparqlJSON) { | ||
| var geojson = { | ||
| "type": "FeatureCollection", | ||
| "features": [] | ||
| }; | ||
|
|
||
| for (var bindingindex = 0; bindingindex < sparqlJSON.results.bindings.length; ++bindingindex) { | ||
| for (var varindex = 0; varindex < sparqlJSON.head.vars.length; ++varindex) { | ||
| if (sparqlJSON.results.bindings[bindingindex][sparqlJSON.head.vars[varindex]].datatype == "http://www.opengis.net/ont/geosparql#wktLiteral") { | ||
| //assumes the well-known text is valid! | ||
| geojson.features.push(wktToGeoJSON(sparqlJSON.results.bindings[bindingindex][sparqlJSON.head.vars[varindex]].value)); | ||
| } | ||
| } | ||
| } | ||
| return geojson; | ||
| //find substring left of first "(" occurrence | ||
| switch (wkt.substr(0, wkt.indexOf("("))) { | ||
| case "POINT": | ||
| geometryType = "Point"; | ||
| break; | ||
| case "MULTIPOINT": | ||
| geometryType = "MultiPoint"; | ||
| break; | ||
| case "LINE": | ||
| geometryType = "Line"; | ||
| break; | ||
| case "MULTILINE": | ||
| geometryType = "MultiLine"; | ||
| break; | ||
| case "POLYGON": | ||
| geometryType = "Polygon"; | ||
| break; | ||
| case "MULTIPOLYGON": | ||
| geometryType = "MultiPolygon"; | ||
| break; | ||
| case "GEOMETRYCOLLECTION": | ||
| geometryType = "GeometryCollection"; | ||
| break; | ||
| default: | ||
| //invalid wkt! | ||
| return {}; | ||
| } | ||
|
|
||
| //chop off geometry type, already have that | ||
| coordinates = wkt.substr(wkt.indexOf("("), wkt.length); | ||
| //add extra [ and replace ( by [ | ||
| coordinates = "[" + coordinates.split("(").join("["); | ||
| //replace ) by ] and add extra ] | ||
| coordinates = coordinates.split(")").join("]") + "]"; | ||
| //replace , by ],[ | ||
| coordinates = coordinates.split(",").join("],["); | ||
| //replace spaces with , | ||
| coordinates = coordinates.split(" ").join(","); | ||
|
|
||
| var feature = { | ||
| "type": "Feature", | ||
| "geometry": { | ||
| "type": geometryType, | ||
| "coordinates": eval('(' + coordinates + ')') | ||
| }, | ||
| "properties": sparqlJSON.results.bindings[bindingindex] | ||
| }; | ||
|
|
||
| geojson.features.push(feature); | ||
| } | ||
| } | ||
| } | ||
| return geojson; | ||
| } |