/// <summary>
/// 从数据库中指定的投影字段得到坐标系统. 任何投影格式都能被使用.
/// </summary>
public CoordinateSystem GetCoordinateSystem(string str, ProjectionSearchType searchType)
{
CoordinateSystem cs = null;
MapWinGIS.GeoProjection proj = new MapWinGIS.GeoProjection();
if (proj.ImportFromAutoDetect(str))
{
cs = this.GetCoordinateSystem(proj, searchType);//返回proj相关的坐标系统
}
return(cs);
}
/// <summary>
/// Gets coordinate system from database for specified projection string. Any projection format can be used.
/// </summary>
public ICoordinateSystem GetCoordinateSystem(string str, ProjectionSearchType searchType)
{
ICoordinateSystem cs = null;
var proj = new SpatialReference();
if (proj.ImportFromAutoDetect(str))
{
cs = GetCoordinateSystem(proj, searchType);
}
if (cs == null && proj.ImportFromEsri(str))
{
cs = GetCoordinateSystem(proj, searchType);
}
return(cs);
}
/// <summary>
/// Returns coordinate system object associated with given GeoProjection.
/// This property is computationally expensive.
/// </summary>
public ICoordinateSystem GetCoordinateSystem(ISpatialReference projection, ProjectionSearchType searchType)
{
if (string.IsNullOrWhiteSpace(_dbname))
{
return(null);
}
if (projection == null || projection.IsEmpty)
{
return(null);
}
// standard
var cs = GetCoordinateSystemCore(projection);
if (searchType == ProjectionSearchType.Standard || cs != null)
{
return(cs);
}
// enhanced
var projTest = new SpatialReference();
if (projTest.ImportFromProj4(projection.ExportToProj4()))
{
cs = GetCoordinateSystemCore(projection);
}
if (searchType == ProjectionSearchType.Enhanced || cs != null)
{
return(cs);
}
// dialects
RefreshDialects();
int code = EpsgCodeByDialectString(projection);
if (code != -1)
{
return(GetCoordinateSystem(code));
}
return(null);
}
/// <summary>
/// 返回与给定的GeoProjection相关的坐标系统对象.
/// 这个属性的计算量很大.
/// </summary>
public CoordinateSystem GetCoordinateSystem(MapWinGIS.GeoProjection projection, ProjectionSearchType searchType)
{
if (m_dbname == "")
{
return(null);
}
// standard
CoordinateSystem cs = this.GetCoordinateSystemCore(projection);
if (searchType == ProjectionSearchType.Standard || cs != null)
{
return(cs);
}
// enhanced
MapWinGIS.GeoProjection projTest = new MapWinGIS.GeoProjection();
if (projTest.ImportFromProj4(projection.ExportToProj4()))
{
cs = this.GetCoordinateSystemCore(projection);
}
if (searchType == ProjectionSearchType.Enhanced || cs != null)
{
return(cs);
}
// dialects
this.RefreshDialects();
int code = this.EpsgCodeByDialectString(projection);
if (code != -1)
{
return(this.GetCoordinateSystem(code));
}
return(null);
}