The Ministry of Agriculture and Environment has issued Circular No. 19/2026, which sets out technical guidelines for integrating surveying, cadastral mapping, land registration, cadastral documentation, and the development of a national land database. The circular provides detailed regulations on how land parcel identification codes are constructed.

Under the new regulation, the creation of land identification codes will be standardized. Each code is a 12-character sequence derived from the geographical position of the land parcel.

Notably, each land plot will have only one unique code, with no duplication nationwide - effectively serving as a “digital identity card” for real estate.

The code is built using the international geographic coordinate system WGS84 and encoded through the GeoHash algorithm, which converts geographic coordinates - latitude and longitude - into a short alphanumeric string.

The circular clearly defines a four-step process for generating land parcel identification codes, ensuring both technical precision and system-wide consistency.

The first step is to determine the representative point of the land parcel. This is carried out on the spatial data layer of the parcel, identifying the coordinate position (X, Y) of a point within the parcel using the VN2000 coordinate system based on the central meridian of each locality.

The representative point is located within the parcel boundary and is calculated from the coordinates of the parcel’s vertices using the Polygonlabel algorithm. This ensures the point lies deep inside the parcel, away from its edges.

From this representative point, the coordinates are then converted from Vietnam’s VN2000 system to the international WGS84 coordinate system, following current conversion formulas.

Next, the geographic coordinates - latitude and longitude - are encoded using the GeoHash algorithm into a 12-character alphanumeric string. This string becomes the official identification code of the land parcel.

Finally, the code is updated into the land parcel code field across relevant datasets, including both spatial cadastral data and attribute data within the national cadastral database.

 
Hong Khanh