I have collections of polygon features. Each point in a polygon has local
cooridantes (x y values) and geodetic Coordinates (latitude and longitude
in decimal degree computed externaly) i can export the shape file(vector)
with xy values using geotools.
How can i export the data by including geodetic coordinates?
Point - X Y values - correspoinding latitude and longitude
Polygon points have coordinates with (x y values) i have find the latlong
values for each point in the shapefile externally by using rubbersheeting
method given in
http://www.corrmap.com/features/rubber-sheeting_transformation.php now i
need to project the lat long values into the shapefile along with x y
values of the points.
Polygons [ p1,p2,p3,p4........soon]
p1 - (x ,y) already in the shapefile (lat, long) computed externally.
id-->*******x********y***************lon*********lat
79-->(8912.811,1481.9799):(80.205185,13.336138)
80-->(8912.811,1481.9766):(80.205185,13.336108)
93-->(8912.656,1481.9835):(80.2038,13.336171)
140-->(8912.8125,1482.0161):(80.20521,13.336465)
My code for exporting shape file with x and y coordinates and i need to
include projection (lat long).
/**
* Writes the Shapes in the featureList into the given File
*
* @param theFile Reference to the File
* @param featureList The list of features to be written
*
* @return TRUE if successfully written; Else FALSE
*/
public boolean writeShape(File theFile, List featureList) throws
Exception
{
ShapefileDataStoreFactory dSFactory = new
ShapefileDataStoreFactory();
Map params = new HashMap();
params.put("url", theFile.toURI().toURL());
params.put("create spatial index", Boolean.TRUE);
ShapefileDataStore newDataStore =
(ShapefileDataStore)
dSFactory.createNewDataStore(params);
newDataStore.createSchema(featureBuilder.getFeatureType());
newDataStore.forceSchemaCRS(DefaultGeographicCRS.WGS84);
String typeName = newDataStore.getTypeNames()[0];
SimpleFeatureSource featureSource =
newDataStore.getFeatureSource(typeName);
boolean success = false;
if (featureSource instanceof SimpleFeatureStore)
{
SimpleFeatureStore featureStore =
(SimpleFeatureStore)featureSource;
SimpleFeatureCollection collection =
new
ListFeatureCollection(featureBuilder.getFeatureType(),
featureList);
Transaction transaction = new DefaultTransaction("create");
featureStore.setTransaction(transaction);
try
{
featureStore.addFeatures(collection);
transaction.commit();
success = true;
}
catch (Exception exp)
{
if (DEBUG) exp.printStackTrace();
transaction.rollback();
success = false;
}
finally
{
transaction.close();
}
}
if (success) showMessage(sCreated);
return success;
}
private SimpleFeatureBuilder createFeatureBuilder()
{
SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
builder.setCRS(DefaultGeographicCRS.WGS84);
builder.setName(plotName);
builder.add(sPolygon, Polygon.class);
builder.length(32).add(plotName, String.class);
builder.length(32).add(sArea, String.class);
final SimpleFeatureType featureType = builder.buildFeatureType();
return new SimpleFeatureBuilder(featureType);
}
public boolean addPolygonFeature(List featureList, Point3D[] thePoints,
String polyId, float area) throws
Exception
{
Polygon aPoly = createPolygon(thePoints);
if (aPoly == null)
{
StringBuffer buf = new StringBuffer();
buf.append(WError1);
buf.append(polyId);
buf.append(WError2);
String error = buf.toString();
int opt = GUIBase.showConfirmDialog(error, "Confirm", GUI_YN);
return (opt == GUIBase.GUI_YES);
}
SimpleFeature feature = featureBuilder.buildFeature(null);
feature.setAttribute(plotName, polyId);
feature.setAttribute(sPolygon, aPoly);
feature.setAttribute(sArea, area);
featureList.add(feature);
return true;
}
/**
* Creates a polygon feature from Array of FMBPoints
*
* @param thePoints Array of Point3Ds
*
* @return Reference to the Polygon object
*/
public static Polygon createPolygon(Point3D[] thePoints)
{
int count = (thePoints == null) ? 0 : thePoints.length;
if (count < 1) return null;
// Store Coordinates of polygon as a LINESTRING.
StringBuffer buffer = new StringBuffer();
buffer.append("POLYGON((");
for (int i=0; i<count; i++)
{
buffer.append(thePoints[i].x);
buffer.append(SPACE);
buffer.append(thePoints[i].y);
buffer.append(COMMA);
}
String lineString = buffer.toString();
lineString = lineString.substring(0, lineString.length()-1) + "))";
if (DEBUG) System.out.println(lineString);
try
{
// Creating the Geometry (Polygon)
return (Polygon) wktReader.read(lineString);
}
catch (Exception excep) { }
return null;
}
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