Scanning of Negative Aerial Photographs for the Archive of the Hellenic Cadastre

Consortis, as part of a consortium of three companies, participates in a strategically important project for the Hellenic Cadastre, providing digitization and georeferencing services for negative aerial photographs. This project aims to create a fully digitized and georeferenced database, enhancing the management and utilization of the country’s geospatial data.

The Problem

The archive contains approximately 407,000 aerial photographs in analog format, with extremely delicate material, making their management, storage, and utilization challenging and time-consuming. Converting these photographs into digital format with high precision and georeferencing them was essential for their effective use within the Hellenic Cadastre framework.

The Solution

The Surveying Department of Consortis, along with its partner companies, implemented an advanced process of digitization and georeferencing:

• Scanning of Analog Material: High-precision scanning equipment was used, installed at the Hellenic Cadastre facilities, to convert the negative aerial photographs into digital format
• Photogrammetric Methods: Advanced photogrammetric techniques were applied to accurately georeference the aerial photographs
• Creation of Footprints: Determination of the footprint of each aerial photograph on the ground in the form of a closed polygon, ensuring accuracy of up to 1 cm at the center of the photograph
• High-Precision Base Maps: Utilization of high-accuracy geospatial data to support georeferencing

Benefits

Consortis’ participation in this project offers multiple benefits:

• Digitization of Valuable Material: Preservation of analog aerial photographs by converting them into digital format, safeguarding critical geospatial data
• Accuracy and Transparency: High precision in the geolocation of aerial photograph footprints, enhancing data reliability
• Support for Cadastre Development: Provision of tools for efficient land management and spatial planning
• Innovation Enhancement: Application of advanced technologies to upgrade geospatial management processes

This project represents a milestone in the transition of the Hellenic Cadastre to a modern, fully digitized system, with Consortis’ Surveying Department playing a key role in its successful completion.