The land records of several states of India are maintained in the office of the Thasildar. The records are stored in volumes pertaining to each village in a compilation of a register or a book known as the Field Management Book (FMB).
FMB sketch refers to an accumulation of map information stored in volumes by the Government of a state at the office of the Thasildar.
The individual survey number sketches are recorded at a scale of 1:1000 or 1:2000. These numbers are further divided into various sub-divisions. Every property owner is allotted with one sub-division of this kind.
FMB specifies the exact dimensions of the land; hence these FMB sketches are of great importance in a purchase transaction of property as it is used to verify the land dimensions and borders of a property.
A sample FMB sketch is shown below
Parts of FMB:
- Subdivision lines
- Extension lines
- Neighboring field survey numbers
The G-line sketches the making of the entire sketch. It is an abstract line that transforms the sketch into various dimensions of triangles to allocate the boundary line and various points of the sketch.
Any inaccuracies made in ascertaining the G-line will damage the calculations done herewith.
The Field line also known as the F-line specifies the actual field borders in the outer lines of the sketch. Its points are specified with reference to its offset space from the G-line.
3. Subdivision Lines
The Subdivision lines delineate a minor portion of land within an individual distinct survey number.
A sub-divisional degree of a polygon is directly connected to the extent found for that respective sub-division. The sub division lines are generally calculated through a ladder, or the likes of it for all purposes excluding the graphical representation in FMB.
The ladder is a measure used to calculate the left or right angle deviated by the offset distance.
The Field line points are demarcated with respect to an offset distance from the G-line. The offset distance may be differed either to the left or right side of the G-line. This left or right angle differed by the offset distance is calculated by a component called as ladder. Conversion of the details of the ladder details into electronic information can produce the outline of the FMB sketch electronically.
5. Extension Lines
The Extension Lines help demarcate the exact position where the field lines of one property meet the field lines of another property. This is very important, as each field number forms a crucial part of the village map, hence exact demarcation of the extension lines plays a vital role.
6. Neighboring Field Survey Numbers
The Neighboring Field Survey Numbers refer to the fields numbers of the neighboring fields around a specific field for which the FMB sketch is procured.
Every survey sketch is bordered by other fields. These surrounding field numbers are marked around each FMB.
This helps in conversion of FMB sketches into D-sketches, etc.
Obtaining FMB Sketch
As mentioned earlier, the FMB sketch is recorded and stored at the office of the Thasildar. Hence to obtain a FMB sketch, one needs to submit a request to the same in writing to the concerned office of the Thasildar falling in the jurisdiction of the land for which the FMB sketch is required.
The FMB records the details of land stored in the office of the Thasildar in the form of volumes. A FMB sketch specifies the exact details pertaining to a land comprising of its dimensions, boundaries, features identified with a unique field number.
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