public MyGeometryConverter(SqlGeometry ngeom, string sproj, string tproj)
{
this._geom = ngeom;
this._sproj = ProjectionInfo.FromProj4String(sproj);
this._tproj = ProjectionInfo.FromProj4String(tproj);
this.MakePointArray();
this.Reproject();
this._builder = new SqlGeometryBuilder();
this._builder.SetSrid(0);
this.rgeom = this.ReBuild();
}
/// <summary>
/// Parses the entire projection from an Esri string. In some cases, this will have
/// default projection information since only geographic information is obtained.
/// </summary>
/// <param name="esriString">
/// The Esri string to parse
/// </param>
public static ProjectionInfo FromEsriString(string esriString)
{
if (String.IsNullOrWhiteSpace(esriString))
{
// Return a default 'empty' projection
return(new ProjectionInfo());
}
if (esriString.Contains("Krovak"))
{
return(ProjectionInfo.FromProj4String("+proj=krovak +lat_0=49.5 +lon_0=24.83333333333333 +alpha=30.28813975277778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +units=m +towgs84=570.8,85.7,462.8,4.998,1.587,5.261,3.56 +no_defs "));
}
var info = new ProjectionInfo();
info.NoDefs = true;
if (!info.TryParseEsriString(esriString))
{
throw new InvalidEsriFormatException(esriString);
}
return(info);
}
/// <summary>
/// This will try to read the string, but if the validation fails, then it will return false,
/// rather than throwing an exception.
/// </summary>
/// <param name="esriString">
/// The string to test and define this projection if possible.
/// </param>
/// <returns>
/// Boolean, true if at least the GEOGCS tag was found.
/// </returns>
public bool TryParseEsriString(string esriString)
{
if (esriString == null)
{
return(false);
}
if (!esriString.Contains("GEOGCS"))
{
return(false);
}
if (esriString.Contains("PROJCS") == false)
{
GeographicInfo.ParseEsriString(esriString);
IsLatLon = true;
Transform = new LongLat();
Transform.Init(this);
return(true);
}
int iStart = esriString.IndexOf(@""",", StringComparison.Ordinal);
Name = esriString.Substring(8, iStart - 8);
int iEnd = esriString.IndexOf("PARAMETER", StringComparison.Ordinal);
string gcs;
if (iEnd != -1)
{
gcs = esriString.Substring(iStart + 1, iEnd - (iStart + 2));
}
else
{
// an odd Esri projection string that doesn't have PARAMETER
gcs = esriString.Substring(iStart + 1);
}
GeographicInfo.ParseEsriString(gcs);
FalseEasting = GetParameter(new string[] { "False_Easting", "Easting_At_False_Origin" }, ref _falseEastingAlias, esriString);
FalseNorthing = GetParameter(new string[] { "False_Northing", "Northing_At_False_Origin" }, ref _falseNorthingAlias, esriString);
CentralMeridian = GetParameter("Central_Meridian", esriString);
// Esri seems to indicate that these should be treated the same, but they aren't here... http://support.esri.com/en/knowledgebase/techarticles/detail/39992
// CentralMeridian = GetParameter(new string[] { "Longitude_Of_Center", "Central_Meridian", "Longitude_Of_Origin" }, ref LongitudeOfCenterAlias, esriString);
LongitudeOfCenter = GetParameter("Longitude_Of_Center", esriString);
StandardParallel1 = GetParameter("Standard_Parallel_1", esriString);
StandardParallel2 = GetParameter("Standard_Parallel_2", esriString);
_scaleFactor = GetParameter("Scale_Factor", esriString);
alpha = GetParameter("Azimuth", esriString);
_longitudeOf1st = GetParameter("Longitude_Of_1st", esriString);
_longitudeOf2nd = GetParameter("Longitude_Of_2nd", esriString);
LatitudeOfOrigin = GetParameter(new[] { "Latitude_Of_Origin", "Latitude_Of_Center", "Central_Parallel" }, ref _latitudeOfOriginAlias, esriString);
iStart = esriString.LastIndexOf("UNIT", StringComparison.Ordinal);
string unit = esriString.Substring(iStart, esriString.Length - iStart);
Unit.ParseEsriString(unit);
if (esriString.Contains("PROJECTION"))
{
iStart = esriString.IndexOf("PROJECTION", StringComparison.Ordinal) + 12;
iEnd = esriString.IndexOf("]", iStart, StringComparison.Ordinal) - 1;
string projection = esriString.Substring(iStart, iEnd - iStart);
Transform = TransformManager.DefaultTransformManager.GetProjection(projection);
Transform.Init(this);
}
double?auxType = GetParameter("Auxiliary_Sphere_Type", esriString);
if (auxType != null)
{
// While the Esri implementation sort of tip-toes around the datum transform,
// we simply ensure that the spheroid becomes properly spherical based on the
// parameters we have here. (The sphereoid will be read as WGS84).
AuxiliarySphereType = (AuxiliarySphereType)auxType;
if (AuxiliarySphereType == AuxiliarySphereType.SemimajorAxis)
{
ProjectionInfo WebMercator = ProjectionInfo.FromProj4String("+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +no_defs ");
WebMercator.Transform = new MercatorAuxiliarySphere();
WebMercator.ScaleFactor = 1;
WebMercator.AuxiliarySphereType = AuxiliarySphereType.SemimajorAxis;
WebMercator.GeographicInfo.Datum.Spheroid = new Spheroid(WebMercator.GeographicInfo.Datum.Spheroid.EquatorialRadius);
WebMercator.Transform.Init(WebMercator);
Transform = WebMercator.Transform;
}
else if (AuxiliarySphereType == AuxiliarySphereType.SemiminorAxis)
{
double r = GeographicInfo.Datum.Spheroid.PolarRadius;
GeographicInfo.Datum.Spheroid = new Spheroid(r);
}
else if (AuxiliarySphereType == AuxiliarySphereType.Authalic ||
AuxiliarySphereType == AuxiliarySphereType.AuthalicWithConvertedLatitudes)
{
double a = GeographicInfo.Datum.Spheroid.EquatorialRadius;
double b = GeographicInfo.Datum.Spheroid.PolarRadius;
double r =
Math.Sqrt(
(a * a
+
a * b * b
/ (Math.Sqrt(a * a - b * b) * Math.Log((a + Math.Sqrt(a * a - b * b)) / b, Math.E)))
/ 2);
GeographicInfo.Datum.Spheroid = new Spheroid(r);
}
}
if (FalseEasting != null)
{
FalseEasting = FalseEasting * Unit.Meters;
}
if (FalseNorthing != null)
{
FalseNorthing = FalseNorthing * Unit.Meters;
}
return(true);
}
