Ortophotos from Point Clouds

How to Create Orthophotos of Floorplans, Sections, and Elevations from Point Clouds

Orthophotos are images that show the true dimensions of objects, which can be used to accurately measure distances, areas, and heights. They can be generated from 3D scan data, also known as point clouds. Compared to point cloud data, orthophotos are notably lighter and quicker to generate. They also have the added benefit that they can be shared across various software platforms, including those that do not support point clouds.

In this article, we will guide you step by step on how to create, copy, annotate and plot orthophotos from point cloud data using ARES Commander CAD software and Undet tools.


How to Create and Manage Orthophotos from Point Clouds

The first step is to create orthophotos from point cloud data. This requires software that can process point clouds and has orthophoto processing tools[MT1] . The video tutorial below will show you how to make orthophotos with ARES Commander CAD software using Undet tools.

Because orthophotos are geometrically accurate, these images have to match the drawing projections, the same as when we draw plans, elevations and sections. We can use the CCS (UCS) command to set and manage coordinate systems for each projection separately. Also, remember to use reference lines and fit marks. We will need these later to link the orthophotos.


How to Copy Orthophotos Using Datum Lines and Fit Marks

After creating orthophotos, the next step is correctly positioning them with each other. Drawing datum lines at the same height or location on orthophotos will help to produce precise sections and elevations. Fit marks, which are small crosses or circles commonly used to mark the corners or edges of features on floorplans, can be used along with datum lines to ensure the accurate placement of objects. We can then use copy and paste to align the orthophotos with each other using fit marks and datum lines.


How to Annotate Orthophotos: Add heights and Dimensions

Orthophotos are useful as they allow us to measure important dimensions. For example, dynamic elevation blocks in sections and elevation images can be used to obtain relevant heights and levels. In plan views, we can focus on horizontal dimensions, such as room sizes and distances. Annotated orthophotos are particularly helpful for making informed decisions, which is usually the goal of drawings. The only difference being that drafting drawings takes much longer than using orthophotos.


How to Plot Annotated Orthophotos into PDF

PDF files are highly versatile and can be easily integrated into different workflows. Plotting orthophotos into PDFs ensures that the information can be accessed and viewed by a wide range of stakeholders, regardless of their operating system or software. With the help of ARES Commander tools[MT4] , orthophotos can be conveniently compiled into layouts, scaled and sized, and printed as PDF documents.

In the last tutorial video, you will learn how to create and print PDF documents with orthophotos using ARES Commander.

Software used in the video content:

  • #ARES Commander CAD software + #Undet point cloud plug-in.

Would you like to learn more about how Undet and ARES Commander can help streamline your point cloud workflows?