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tg.ProjectionClient

A class that provides the methods to access the GIS Server Projection APIs. Converts geometry in Well Known Text format from one spatial reference system to another.

Syntax

var projectionClient = new tg.ProjectionClient('Your-Cloud-Service-Api-Key');

Parameters

Name Type Description
apiKey string An API key for access to ThinkGeo Cloud services, it can be created following the guide

Return Value - a project object to access the Projection APIs in ThinkGeo Cloud service.

project(options, callback)

Converts a geometry from one spatial reference system to another.

Syntax

  var options = {
    pointX: 31.9000,
    pointY: -55.0000,
    fromProj: 4326,
    toProj: 3857
  };
  var callback = function (status, response) {
      console.log(response);
  };
  projectionClient.project(options, callback);

Parameters

Name Type Description
options Options
Name Type Default Description
--- --- --- ---
pointX number The X coordinate of the point.
pointY number The Y coordinate of the point.
wkt string The geometry that you want to reproject.
body object A request object containing the geometries to be reprojected, as well as input and output spatial reference systems.
fromProj string The EPSG/ESRI ID or Proj4 projection string describing the original spatial reference system in which the geometry is expressed. If using a Proj4 string, the value should be URL-encoded.
toProj string The EPSG/ESRI ID or Proj4 projection string describing the target spatial reference system that you want the geometry reprojected to. If using a Proj4 string, the value should be URL-encoded.
callback function the callback for response

projectForPoint(pointY, pointX, fromProj, toProj, callback)

Converts a geometry from one spatial reference system to another.

Syntax

  var callback = function (status, response) {
      console.log(response);
  };
  projectionClient.projectForPoint(-55.0000,31.9000,4326,3857, callback);

Parameters

Name Type Description
pointY number The Y coordinate of the point.
pointX number The X coordinate of the point.
fromProj string The EPSG/ESRI ID or Proj4 projection string describing the original spatial reference system in which the geometry is expressed. If using a Proj4 string, the value should be URL-encoded.
toProj string The EPSG/ESRI ID or Proj4 projection string describing the target spatial reference system that you want the geometry reprojected to. If using a Proj4 string, the value should be URL-encoded.
callback function the callback for response

projectionClient.projectForGeometry(wkt, fromProj, toProj, callback)

Converts geometry in Well Known Text format from one spatial reference system to another.

Syntax

  var callback = function (status, response) {
      console.log(response);
  };
  projectionClient.projectForGeometry('LINESTRING(-1399103.3657318656 308805.5942721125,-802283.0488812095 592539.8432666864)',3857, 4326, callback);

Parameters

Name Type Description
wkt string The geometry that you want to reproject.
fromProj string The EPSG/ESRI ID or Proj4 projection string describing the original spatial reference system in which the geometry is expressed. If using a Proj4 string, the value should be URL-encoded.
toProj string The EPSG/ESRI ID or Proj4 projection string describing the target spatial reference system that you want the geometry reprojected to. If using a Proj4 string, the value should be URL-encoded.
callback function the callback for response

projectForGeometries(options, callback)

Converts a collection of geometries in Well Known Text format from one spatial reference system to another.

Syntax

   var wktArr=[
      "POINT(-997961.8412912609 563188.0244051788)",
      "POINT(-900122.4450862352 484916.5074411584)",
      "POINT(-802283.0488812095 612107.7225076917)"
   ];
   var options = {
      body: {
          wkt: wktArr,
          fromProj: "3857",
          toProj: "4326"
      }
  };
  var callback = function (status, response) {
      console.log(response);
  };
  projectionClient.projectForGeometries(options , callback);

Parameters

Name Type Description
options Options
Name Type Default Description
--- --- --- ---
body object A request object containing the geometries to be reprojected, as well as input and output spatial reference systems.
callback function the callback for response