The following are the four types of survey errors.
1. Measurement errors:
If the same line was measured twice the result would hardly ever be the same and this difference was due to the inevitable practical error which crept despite all our care. As measurement progresses more or less tension in the chain will inevitably occur due to improper arrows planted or manipulation when measuring up and down with elevated ridges.
| For survey | For Maintenance |
|---|---|
1.For F-lines up to 5 chains, a margin of 3 links, and Over 5 chains, 1 link per chain up to a limit of 10 links. |
1.Up to 5 chains, a margin of 5 links and Over 5 chains, 1 link per chain up to 10 links in wetland, 20 links in dry land. |
2. For G-lines and diagonals where cross-staff is used and for offset measurements, up to 5 chains, a margin of 4 links and Inlines over 5 chains, 1 link per chain up to a limit of 10 links. |
– |
If the above allowances exceed it may be considered a survey error.
2. Plotting errors:
The difference in area is 5% due to errors in plotting anything beyond this allowance is considered a plotting error.
3. Area errors:
Case-1: The area of the Survey field or any subdivision the difference between the actual area and the registered area is below 5%, therefore, the registered area may be noted and no changes are needed.
| Survey Number | Sub Division | Reg. Area(Ac-Cents) | Actual Area(Ac-Cents) | Adjusted Area(Ac-Cents) | Accepted Area(Ac-Cents) |
|---|---|---|---|---|---|
1 |
1 |
07-51 |
07-85 |
– |
07-51 |
2 |
00-85 |
00-87 |
– |
00-85 | |
3 |
02-32 |
02-30 |
– |
02-32 | |
Total Area |
10-68 |
11-02 |
– |
10-68 |
Case-2: The total area of the Survey field should not be more than 5% of the actual area but the actual subdivision area may any one of them exceeds the registered area.
| Survey Number | Sub Division | Reg. Area(Ac-Cents) | Actual Area(Ac-Cents) | Adjusted Area(Ac-Cents) | Accepted Area(Ac-Cents) |
|---|---|---|---|---|---|
1 |
1 |
03-34 |
02-85 |
02-74 |
02-74 |
2 |
01-56 |
02-91 |
02-79 |
02-79 | |
3 |
01-25 |
00-89 |
00-86 |
00-86 | |
4 |
01-82 |
01-65 |
01-58 |
01-58 | |
Total Area |
07-97 |
08-30 |
07-97 |
Case-3:The area of Survey field, the difference between actual area and registered area is above 5% therefore the actual area may be noted.
| Survey Number | Sub Division | Reg. Area(Ac-Cents) | Actual Area(Ac-Cents) | Adjusted Area(Ac-Cents) | Accepted Area(Ac-Cents) |
|---|---|---|---|---|---|
1 |
1 |
00-91 |
00-88 |
– |
00-88 |
2 |
01-39 |
01-40 |
– |
01-40 | |
3 |
06-93 |
06-18 |
– |
06-18 | |
Total Area |
09-23 |
08-38 |
– |
08-38 |
4. Traverse Errors:
How it is rectified in the course of maintenance?
The difference of more than 5% between the actual area computed and the registered area of a Revenue field will be treated as an error in area. The procedure for correcting the Survey Errors involving alternation in alteration is explained below:
- The Mandal Surveyor will after completing the re-measurement, prepare and submit to the Mandal Revenue Officer (Tahsildar) revised maps in duplicate and also draft notices in the prescribed form (Appendix XIV) calling for objections within 15 days from the date of receipt of such notice.
- The M.R.O. will serve the notices on the parties concerned, note on the duplicate copy the date on which any objections were heard by him, and an abstract of his orders, and forward all the connected records to the Deputy Inspector or Asst. Director Survey & Land Records.
- The Divisional Dy. Inspector /Asst.Director should scrutinize the maps and records, prepare a memorandum of alterations in the prescribed form and submit the file to the Collector.
- After approval by the Collector the case should be entered in the “Register of Survey Errors corrected” which will be maintained by the Dy. Inspector/ Asst. Director. The records should then be returned to the M.R.O. who will have the revised field maps inserted in the Village F.M.B. and Taluk copy of the F.M.B. and corrections made in the permanent “A” Register.
- The file should then be given disposal No. and recorded in the Taluk Office after intimation to the Assistant Director, of the date of insertion of the copy of the field map in the Taluk F.M.B.
- The correction of an error in the calculation of area which involves an alternation in the area of a Revenue field should be dealt with in the above manner with the exception that revised maps need not be prepared.
