Horizontal datum defining the standard datum information.
Inheritance: Datum, IHorizontalDatum
コード例 #1
0
ファイル: HorizontalDatum.cs プロジェクト: beritec/fdotoolbox
        /// <summary>
        /// Checks whether the values of this instance is equal to the values of another instance.
        /// Only parameters used for coordinate system are used for comparison.
        /// Name, abbreviation, authority, alias and remarks are ignored in the comparison.
        /// </summary>
        /// <param name="obj"></param>
        /// <returns>True if equal</returns>
        public override bool EqualParams(object obj)
        {
            if (!(obj is SharpMap.CoordinateSystems.HorizontalDatum))
            {
                return(false);
            }
            HorizontalDatum datum = obj as HorizontalDatum;

            if (datum.Wgs84Parameters == null && this.Wgs84Parameters != null)
            {
                return(false);
            }
            if (datum.Wgs84Parameters != null && !datum.Wgs84Parameters.Equals(this.Wgs84Parameters))
            {
                return(false);
            }
            return(datum.Ellipsoid == this.Ellipsoid && this.DatumType == datum.DatumType);
        }
コード例 #2
0
        /// <summary>
        /// 
        /// </summary>
        /// <param name="tokenizer"></param>
        /// <returns></returns>
        private static IHorizontalDatum ReadHorizontalDatum(WktStreamTokenizer tokenizer)
        {
            //DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
            Wgs84ConversionInfo wgsInfo = null;
            string authority = String.Empty;
            long authorityCode = -1;

            tokenizer.ReadToken("[");
            string name = tokenizer.ReadDoubleQuotedWord();
            tokenizer.ReadToken(",");
            tokenizer.ReadToken("SPHEROID");
            IEllipsoid ellipsoid = ReadEllipsoid(tokenizer);
            tokenizer.NextToken();
            while (tokenizer.GetStringValue() == ",")
            {
                tokenizer.NextToken();
                if (tokenizer.GetStringValue() == "TOWGS84")
                {
                    wgsInfo = ReadWGS84ConversionInfo(tokenizer);
                    tokenizer.NextToken();
                }
                else if (tokenizer.GetStringValue() == "AUTHORITY")
                {
                    tokenizer.ReadAuthority(ref authority, ref authorityCode);
                    tokenizer.ReadToken("]");
                }
            }
            // make an assumption about the datum type.
            IHorizontalDatum horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, DatumType.HD_Geocentric, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);

            return horizontalDatum;
        }