Orthophoto map production

An orthophoto map is an aerial image corrected for perspective distortion and terrain relief so that it has a uniform scale. Unlike an ordinary aerial photo, distances, areas and coordinates can be measured on it directly. It is therefore widely used as a visual base for design, for analysing land plot boundaries, updating GIS maps and showing a client the real condition of a site.

Orthophoto accuracy depends on flight height, image overlap and the quality of ground control. We plan flights with 70–80% forward and side overlap, measure ground control points with GNSS RTK and run aerial triangulation in photogrammetric software. The images are then rectified using a digital surface model, the mosaic is colour-balanced, and seamlines are edited so they do not cross buildings or roads.

The result is delivered as GeoTIFF in the national coordinate system or WGS-84/UTM 39N, split into tiles for large areas. The orthophoto opens directly in AutoCAD, Civil 3D, QGIS, ArcGIS and other software. An accuracy report on check points shows clearly which tasks the orthophoto is suitable for.

When you need it

• Visual base for design
• Analysis of land plot boundaries and land use
• Updating GIS maps and cadastral data
• Documenting the state of construction sites and quarries
• Presenting a site to investors and clients

What's included

• Flight planning for the required pixel size
• GNSS RTK measurement of control points
• Aerial imaging
• Aerial triangulation and digital surface model
• Orthorectification, mosaicking and colour balancing
• Accuracy report

How we work

1. Agreeing area, pixel size and coordinate system
2. Preparing flight permit and plan
3. Measuring control points and flying
4. Photogrammetric processing and mosaicking
5. Accuracy check and delivery

Deliverables

• Orthophoto (GeoTIFF, ECW/JPG if required)
• Digital surface model
• Accuracy report on check points
• Print-ready sheets on request