[NOT READY] Add initial support for FileGDB format

lib/datasource-processor.js

@@ -113,7 +113,12 @@ function getProjection(file, filetype, callback) {
             if (err) return callback(err);
             return callback(null, proj);
         });
-    //else kml and gpx
+    } else if(filetype === '.gdb') {
+        projectionViaOGR(file, function(err, proj) {
+            if (err) return callback(err);
+            return callback(null, proj);
+        });
+    //else kml, gpx, geojson, and csv we assume is WGS84 (aka +init=epsg:4326 or +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs)
     }
     else return callback(null, '+init=epsg:4326');
 }
@@ -438,6 +443,37 @@ function projectionFromRaster(filepath, callback) {
 
     callback(null, info);
 }
+
+/**
+ * Obtains projection from any ogr vector format by using node-gdal lib
+ * @param file (filepath)
+ * @returns result.proj4
+ */
+function projectionViaOGR(filepath, callback) {
+
+    var ds;
+    try { ds = gdal.open(filepath); }
+    catch(err) {
+        return callback(invalid('could not open the file ' + filepath));
+    }
+
+    if (!ds || !ds.layers || ds.layers.count() < 1) {
+        return callback(invalid('file has no valid layers: ' + filepath));
+    }
+    // FIXME: https://github.com/mapbox/mapnik-omnivore/issues/72
+    if (ds.layers.count() > 1) {
+        return callback(invalid('No support yet for multilayer files inside ' + filepath));
+    } else {
+        try {
+            var proj4 = srs.parse(ds.layers.get(0).srs.toWKT()).proj4;
+            if (proj4) return callback(null,proj4);
+        } catch(err) {
+            console.error(err.stack);
+        }
+    }
+    return callback(invalid('could not read spatial reference information for ' + filepath));
+}
+
 /**
  * Iterates through source's bands and obtains band properties
  * @param ds (Datasource)
@@ -565,7 +601,7 @@ function getDatasourceProperties(file, filetype, callback) {
     }
 
     // Get layers for kml or topojson
-    else if (filetype === '.kml' || filetype === '.topojson') {
+    else if (filetype === '.kml' || filetype === '.topojson' || filetype === '.gdb') {
         // Get KML layer names from the OGR error message...for now
         getLayers(options, function(err, layers) {
             if (err) return callback(err);
@@ -657,5 +693,6 @@ module.exports = {
     getMinMaxZoomGDAL: getMinMaxZoomGDAL,
     getProjection: getProjection,
     projectionFromRaster: projectionFromRaster,
-    projectionFromShape: projectionFromShape
+    projectionFromShape: projectionFromShape,
+    projectionViaOGR: projectionViaOGR
 };

package.json

@@ -25,7 +25,7 @@
     "tape": "3.0.x",
     "coveralls": "~2.11.1",
     "istanbul": "~0.3.0",
-    "mapnik-test-data": "http://mapbox-npm.s3.amazonaws.com/package/mapnik-test-data-2.0.3-fece0a9c546074a1479e9eae2333184029bb2279.tgz"
+    "mapnik-test-data": "https://github.com/mapbox/mapnik-test-data/tarball/moar"
   },
   "scripts": {
     "test": "tape test/*.js",

test/datasource-processor.test.js

@@ -14,6 +14,7 @@ var expectedMetadata_1week_earthquake = JSON.parse(fs.readFileSync(path.resolve(
 var expectedMetadata_sample_tif = JSON.parse(fs.readFileSync(path.resolve('test/fixtures/metadata_sample_tif.json')));
 var expectedMetadata_sample_vrt = JSON.parse(fs.readFileSync(path.resolve('test/fixtures/metadata_sample_vrt.json')));
 var expectedMetadata_topo = JSON.parse(fs.readFileSync(path.resolve('test/fixtures/metadata_topo.json')));
+var expectedMetadata_filegdb = JSON.parse(fs.readFileSync(path.resolve('test/fixtures/metadata_filegdb.json')));
 
 var UPDATE = process.env.UPDATE;
 
@@ -201,6 +202,23 @@ var UPDATE = process.env.UPDATE;
 /**
  * Testing datasourceProcessor.init
  */
+    tape('[FILEGDB] Setup', function(assert) {
+        var gdbFile = testData + '/data/filegdb/multipoint.gdb';
+        var filesize = 428328; // N/A since it is a directory!
+        var type = '.gdb';
+        //Overwrites metadata json file if output does not match
+        datasourceProcessor.init(gdbFile, filesize, type, function(err, metadata) {
+            if (err) {
+                assert.ifError(err, 'should not error');
+                return assert.end();
+            }
+            if (UPDATE) fs.writeFileSync(path.resolve('test/fixtures/metadata_filegdb.json'), JSON.stringify(metadata, null, 2));
+            assert.deepEqual(metadata, expectedMetadata_filegdb);
+
+            assert.end();
+        });
+    });
+
     tape('[SHAPE] Setup', function(assert) {
         var shpFile = testData + '/data/shp/world_merc/world_merc.shp';
         var filesize = 428328;

test/fixtures/metadata_filegdb.json

@@ -0,0 +1,33 @@
+{
+  "filesize": 428328,
+  "projection": "+proj=utm +zone=18 +datum=WGS84 +units=m +no_defs",
+  "filename": "multipoint",
+  "center": [
+    -75.16024141355962,
+    39.95769202781635
+  ],
+  "extent": [
+    -75.16026089315217,
+    39.9576802349116,
+    -75.16022193396708,
+    39.9577038207211
+  ],
+  "json": {
+    "vector_layers": [
+      {
+        "id": "multipoint",
+        "description": "",
+        "minzoom": 0,
+        "maxzoom": 22,
+        "fields": {}
+      }
+    ]
+  },
+  "minzoom": 0,
+  "maxzoom": 22,
+  "layers": [
+    "multipoint"
+  ],
+  "dstype": "ogr",
+  "filetype": ".gdb"
+}