新旧图幅号转换的公式如下图所示：
共有50W，25W，10W，5W，2.5W，1W几种比例尺
下面的公式中，字母的下标表示对应的比例尺
H代表新图幅号中的行号，例如：J49E016003中的016，共三位，不足三位的在前面补0
L代表新图幅号中的列号，例如：J49E016003中的003，共三位，不足三位的在前面补0
X代表旧图幅号中的地图代码值，有A，B，C，D的一律转为1，2，3，4
其中[]表示取整，（）表示取模
旧->新
新->旧：
下面是一段将新图幅号转为旧图幅号的示例代码（C#，100W，50W，25W，10W，5W几种比例尺）
//新图幅号转到旧图幅号 private string SheetNoConvert(string newNo) { if (newNo.Length != 3 && newNo.Length != 10) return null; string bigRowNo = newNo[0].ToString(); string bigColNo = newNo.Substring(1, 2); if (newNo.Length == 3) //100W return bigRowNo + "-" + bigColNo; else { char scaleChar = newNo[3]; //新图幅号第三位，标识是哪种比例尺 int H, L; //新图幅号的行列代码，H为行代码，L为列代码 //提取行代码和列代码，若非数字，则表示图幅号格式不正确 if (!int.TryParse(newNo.Substring(4, 3), out H) || !int.TryParse(newNo.Substring(7, 3), out L)) return null; if (newNo[3] == 'B') //50W { #region 50W if (H > 2 || L > 2) return null; int X = (H - 1) * 2 + (L - 1) + 1; //旧图幅号对应的地图代码 string code = ""; switch (X) { case 1: code = "A"; break; case 2: code = "B"; break; case 3: code = "C"; break; case 4: code = "D"; break; default: break; } return bigRowNo + "-" + bigColNo + "-" + code; #endregion } else if (newNo[3] == 'C')//25W { #region 25W if (H > 4 || L > 4) return null; int X = (H - 1) * 4 + (L - 1) + 1; //旧图幅号对应的地图代码 string code = ""; if (X > 9) code = X.ToString(); else code = "0" + X; return bigRowNo + "-" + bigColNo + "-[" + code + "]"; #endregion } else if (newNo[3] == 'D') //10W { #region 10W if (H > 12 || L > 12) return null; int X = (H - 1) * 12 + (L - 1) + 1; //旧图幅号对应的地图代码 string code = ""; if (X > 99) code = X.ToString(); else if (X > 9) code = "0" + X; else code = "00" + X; return bigRowNo + "-" + bigColNo + "-" + code + ""; #endregion } else if (newNo[3] == 'E') //5W { #region 5W if (H > 24 || L > 24) return null; int H10 = (H - 1) / 2 + 1; //10W地形图对应的行号 int L10 = (L - 1) / 2 + 1; //10W地形图对应的列号 int X10 = (H10 - 1) * 12 + (L10 - 1) + 1; //10W旧图幅号对应的地图代码 string code = ""; if (X10 > 99) code = X10.ToString(); else if (X10 > 9) code = "0" + X10; else code = "00" + X10; int X = (H - 2 * H10 + 1) * 2 + (L - 2 * L10 + 1) + 1; //旧图幅号对应的地图代码 switch (X) { case 1: code += "-A"; break; case 2: code += "-B"; break; case 3: code += "-C"; break; case 4: code += "-D"; break; default: break; } return bigRowNo + "-" + bigColNo + "-" + code + ""; #endregion } else return null; //图幅号格式不正确 }
下面是一段将旧图幅号转为新图幅号的示例代码（C#，100W，50W，25W，10W，5W几种比例尺）
//旧图幅号转到新图幅号 private string SheetNoConvert2(string old_number) { String[] temp1 = old_number.Split('-'); if (temp1.Length == 1) return ""; else if (temp1.Length == 2)// I-45 100万比例尺的图幅号 return temp1[0] + temp1[1]; else if (temp1.Length == 4) //5W地形图 I-48-060-C { #region 5w int x10 = -1; if (!int.TryParse(temp1[1], out x10)) return ""; if (!int.TryParse(temp1[2], out x10)) return ""; int x5 = -1; if (temp1[3] == "A") x5 = 1; else if (temp1[3] == "B") x5 = 2; else if (temp1[3] == "C") x5 = 3; else if (temp1[3] == "D") x5 = 4; else return ""; int h10 = (x10 - 1) / 12 + 1; int l10 = (x10 + 11) % 12 + 1; int h5 = 2 * h10 + (x5 - 1) / 2 - 1; int l5 = 2 * l10 + (x5 + 1) % 2 - 1; string h5s = ""; if (h5 < 10) h5s = "00" + h5; else if (h5 < 100) h5s = "0" + h5; else h5s = h5.ToString(); string l5s = ""; if (l5 < 10) l5s = "00" + l5; else if (l5 < 100) l5s = "0" + l5; else l5s = l5.ToString(); return temp1[0] + temp1[1] + "E" + h5s + l5s; #endregion } else if (temp1.Length == 3) { if (temp1[2].Length == 1) //50W地形图 H-45-B { #region 50w int x50 = -1; if (temp1[2] == "A") x50 = 1; else if (temp1[2] == "B") x50 = 2; else if (temp1[2] == "C") x50 = 3; else if (temp1[2] == "D") x50 = 4; else return ""; int h50 = (x50 - 1) / 2 + 1; int l50 = (x50 + 1) % 2 + 1; string h50s = ""; if (h50 < 10) h50s = "00" + h50; else if (h50 < 100) h50s = "0" + h50; else h50s = h50.ToString(); string l50s = ""; if (l50 < 10) l50s = "00" + l50; else if (l50 < 100) l50s = "0" + l50; else l50s = l50.ToString(); return temp1[0] + temp1[1] + "B" + h50s + l50s; #endregion } else if (temp1[2].Length == 4) //25W地形图 H-47-[14] { #region 25w if (temp1[2][0] != '[' || temp1[2][3] != ']') return ""; int x25 = -1; if (!int.TryParse(temp1[2].Substring(1, 2), out x25)) return ""; int h25 = (x25 - 1) / 4 + 1; int l25 = (x25 + 3) % 4 + 1; string h25s = ""; if (h25 < 10) h25s = "00" + h25; else if (h25 < 100) h25s = "0" + h25; else h25s = h25.ToString(); string l25s = ""; if (l25 < 10) l25s = "00" + l25; else if (l25 < 100) l25s = "0" + l25; else l25s = l25.ToString(); return temp1[0] + temp1[1] + "C" + h25s + l25s; #endregion } else if (temp1[2].Length == 3) //10W地形图 K-50-041 { #region 10w int x10 = -1; if (!int.TryParse(temp1[2], out x10)) return ""; int h10 = (x10 - 1) / 12 + 1; int l10 = (x10 + 11) % 12 + 1; string h10s = ""; if (h10 < 10) h10s = "00" + h10; else if (h10 < 100) h10s = "0" + h10; else h10s = h10.ToString(); string l10s = ""; if (l10 < 10) l10s = "00" + l10; else if (l10 < 100) l10s = "0" + l10; else l10s = l10.ToString(); return temp1[0] + temp1[1] + "D" + h10s + l10s; #endregion } else return ""; } else return ""; }
