Wkt-parser-dart is the Dart version of proj4js/wkt-parser to convert a WKT CRS string into a Map<String, dynamic> object.
Add wkt_parser to pubspec.yml (dependencies section), then run pub get to download the new dependencies.
dependencies: wkt_parser: any # or the latest version on PubYou can convert any OGC WKT / ESRI WKT definition string copied from epsg.io into a Map<String,dynamic> format which then can be further converted into JSON to be fully interoperable with any programming languages. This example uses the OGC WKT of EPSG:23700.
import 'package:wkt_parser/wkt_parser.dart' as wkt_parser; void main() { // WKT CRS string var wktText = 'PROJCS["HD72 / EOV",GEOGCS["HD72",DATUM["Hungarian_Datum_1972",SPHEROID["GRS 1967",6378160,298.247167427,AUTHORITY["EPSG","7036"]],TOWGS84[52.17,-71.82,-14.9,0,0,0,0],AUTHORITY["EPSG","6237"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4237"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",47.14439372222222],PARAMETER["longitude_of_center",19.04857177777778],PARAMETER["azimuth",90],PARAMETER["rectified_grid_angle",90],PARAMETER["scale_factor",0.99993],PARAMETER["false_easting",650000],PARAMETER["false_northing",200000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Y",EAST],AXIS["X",NORTH],AUTHORITY["EPSG","23700"]]'; // Parsed object of type ProjWKT var output = wkt_parser.parseWKT(wktText); // This returns a JSON encoded string of the WKT print(output.toString()); }The result should be (with JSON encode):
{ "type": "PROJCS", "name": "HD72 / EOV", "GEOGCS": { "name": "HD72", "DATUM": { "name": "Hungarian_Datum_1972", "SPHEROID": { "name": "GRS 1967", "a": 6378160.0, "rf": 298.247167427, "AUTHORITY": { "EPSG": "7036" } }, "TOWGS84": [52.17, -71.82, -14.9, 0.0, 0.0, 0.0, 0.0], "AUTHORITY": { "EPSG": "6237" } }, "PRIMEM": { "name": "greenwich", "convert": 0.0, "AUTHORITY": { "EPSG": "8901" } }, "UNIT": { "name": "degree", "convert": 0.0174532925199433, "AUTHORITY": { "EPSG": "9122" } }, "AUTHORITY": { "EPSG": "4237" } }, "PROJECTION": "Hotine_Oblique_Mercator_Azimuth_Center", "latitude_of_center": 47.14439372222222, "longitude_of_center": 19.04857177777778, "azimuth": 90.0, "rectified_grid_angle": 90.0, "scale_factor": 0.99993, "false_easting": 650000.0, "false_northing": 200000.0, "UNIT": { "name": "metre", "convert": 1.0, "AUTHORITY": { "EPSG": "9001" } }, "AXIS": [ ["Y", "EAST"], ["X", "NORTH"] ], "AUTHORITY": { "EPSG": "23700" }, "projName": "Hotine_Oblique_Mercator_Azimuth_Center", "units": "meter", "to_meter": 1.0, "datumCode": "hungarian_datum_1972", "ellps": "GRS 1967", "a": 6378160.0, "rf": 298.247167427, "datum_params": [52.17, -71.82, -14.9, 0.0, 0.0, 0.0, 0.0], "k0": 0.99993, "lat0": 0.8228248943093227, "longc": 0.3324602953246919, "x0": 650000.0, "y0": 200000.0, "alpha": 1.5707963267948966, "srsCode": "HD72 / EOV" }Wkt-parser-dart was ported from proj4js/wkt-parser by Gergely Padányi-Gulyás (@fegyi001) at Ulyssys Ltd, Budapest, Hungary.