Town survey operations (A to H process)

Town survey covers streets, private plots, and government/municipal lands inside a municipal area so encroachments can be found and records kept current. Work is organised as lettered stages A through H. This is a field checklist, not a substitute for the Survey Manual or current GOs.

Why town survey differs from village cadastral

• Dense built-up areas (old town cores) vs planned layouts with compounds.
• Every plot—private, government, or municipal—must be surveyable and recoverable.
• Street network and panchayat/municipal interest often drive boundary priorities.

Process overview

Stage	Name	What you deliver
—	Index map preparation	Control sketch of town wards / blocks for planning work
A	Boundary demarcation	Outer / block boundaries fixed with durable marks
B	Traverse survey	Traverse lines measured on ground
C–D	Traverse computation & plotting	Adjusted traverse plotted for control
E	Field demarcation	Plot corners and street lines marked
F	Field measurement	Detailed measurement of plots / streets
—	Inspection	Supervisory check of field work
—	Final check operations	Corrections before final mapping
G–H	Mapping	Fair maps / fair records prepared and checked

1. Index map preparation

1. Collect existing municipal maps, village maps (if town grew from villages), and prior survey data.
2. Divide the town into workable blocks/wards for control and progress tracking.
3. Note dense vs open areas — methods and density of control differ.

2. A process — boundary demarcation

1. Fix outer town / block boundaries with stones or permanent marks.
2. Clear disputed or encroached stretches with revenue / municipal officers before accepting a line.
3. Record marks so later traverse and detail can hang on them.

3. B process — traverse survey

1. Run theodolite (or total station) traverse connecting control marks.
2. Measure angles and distances carefully; keep field book neat for computation.
3. Close traverses wherever design allows so misclosure can be checked.

4. C and D processes — computation and plotting

1. Compute coordinates / bearings; adjust within allowable error.
2. Plot traverse on a suitable scale for the town sheet.
3. Reject or reobserve if misclosure exceeds norms — do not force-fit detail onto a bad traverse.

5. E process — field demarcation

1. From plotted control, set out plot corners, street alignments, and government parcels on ground.
2. Plant temporary/permanent marks as ordered.
3. Involve parties where private boundaries change enjoyment.

6. F process — field measurement

1. Measure all required sides/offsets for private and public parcels.
2. Note buildings, compounds, and encroachments relative to legal lines.
3. Keep FMB-style sketches consistent with traverse orientation.

7. Inspection and final check

• Inspecting officer verifies control, marks, and sample measurements.
• Correct errors before fair mapping; late fixes cost more than rework in F stage.

8. G and H processes — mapping

1. Prepare fair maps / town survey sheets from checked field data.
2. Complete abstracts, area lists, and registers required for municipal/revenue use.
3. Submit for scrutiny under the prevailing town-survey standing instructions.

Field tips

• Work from whole (A–D control) to part (E–F detail).
• Old cores need denser control; planned layouts may follow layout deeds but still need survey control.
• Encroachment notes are part of the product — not optional commentary.

Related: Cadastral principles · D&O system · Tools