Orthomosaic mapping is one of the subcategories of aerial data services. Before we dive into the orthomosaic map, let’s talk about orthophotos to understand the concept of the orthomosaic map. An orthophoto or orthoimage is an aerial image that’s geometrically rectified in a uniformed scale without any distortion. 

Orthophotos can be used to measure the actual distances of the geographical landscapes. This is because it creates an almost exact representation of the Earth’s surface when done with critical adjustments. And a collection of such photographs stitched together with geometric rectification to form a map of a certain area is called an orthomosaic map. Maps like these are very detailed in nature and consist of an actual representation of the area. Orthophotos are captured with the help of a powerful aerial surveying drone.

Uses of orthomosaic maps

In Police Work

Orthomosaic maps can be used to map locations like malls and schools from very high ranges. When in a critical situation like shooting, fire, or terrorist siege, the maps work great in showing each detail without altering the scaling to give the police a precise calculation of the area. Othromosaic maps can also be used in times when naked eyes fail to identify clues or evidence. The maps can trace as little as a mobile for the searcher’s convenience. The map can also keep detailed accounts of the damage of a said location so that the responders understand the risk or the damage.

Real Estate

Orthomosaic maps can also be used in infrastructures and real estate for a detailed plan of properties. All the details may help to achieve you the biggest bargains when you think of selling a property. The aerial mapping covers all the areas, the periphery, and houses by picturizing thousands of acres of property. This can be a major help for realtors when trying to sell a particular property to the customers; the pictures of the location with precise details can make buyers more invested and interested in the plan.

Construction

Maps like this can help to deliver closures on the updates of the construction project’s progress. You don’t need to take a plane or chopper to supervise the construction from that high. The drones have high quality and resolution cameras that allow the drone operator to zoom in and out of different parts of the buildings under construction.

Conservation & Agriculture

Orthomosaic maps can also help conservationists by mapping the forests, sand dunes, water bodies, etc. As they give numerous and detailed information about the surrounding, you can easily keep tabs on the conservations without having to take the trouble to pay a visit every time. The same could be said for agriculture as well. Ortho maps can help farmers get helpful information about how their crops are doing and how the land’s condition looks.

How Drones Are Collecting Orthoimages Via Photogrammetry

Before drones came out, aerial photography was usually performed by aircraft or satellites handled by man. However, using manually operated transports can put human lives and survey areas at risk. Also, they weren’t free of human error. Satellite technology isn’t used much because it comes with a heavy price tag. Hence when the drone came out, it was already a hit! And the fact that it’s less expensive than satellite and doesn’t require human-crewed flight makes it more convenient. Plus, the power of the camera lens can capture even the minute details that the naked eye can easily miss.

How Drones Are Collecting Orthoimages Via Photogrammetry

When performing photogrammetry for collecting orthoimages, a few factors should be kept in mind: precise flight plan, data formation, and orthoimage conversions.

Flight Plan

When developing a flight plan, the main motto should be creating high-resolution and relevant images. Images should be sharp, well-timed, and properly captured. Poor quality images will most likely generate blurry, unclear images with distortions. Remember that proper overlapping needs to be done to get an evenly covered area. The angles need to be just precise to take such photographs, or else the pictures will look out of place. Fortunately, modern drones come with advanced mobility and hovering that makes photography easier.

Data Formation

The images are the first step, but they aren’t the only thing you should factorize. The second important thing is metadata. Metadata is a collection of data-encoded notes used to make image organization easier. The metadata connects the images to GIS location and provides other valuable factors like time and date, focal length, resolution settings, weather, and climate, etc. All these metadata collected with the image allows map processing software to create a more comprehensive report.

Orthoimage Conversion

After the data formation is successful, converting these images to a 3D map needs good processing software. To get the best results, you need software that works fast and efficiently with larger data because that’s where you’d find the most problems. There isn’t a limitation for uploads though, there is much software that comes with an automated scale to meet your demands. The software you use should be 90% accurate, or else all the hard works are wasted! External distortion, poor management practices are something you should stay away from when generating a map from the images. 

Also, the software should be free of bugs and unnecessary crashes. Frequent software crashes can ruin your entire project, or worse – make them disappear. You should aim for stable, user-friendly software that is easy to use because the software will do the most important work.

Our Drone Service

At GeoDrones Aerial Services, it is not just Drone Services and Drone flights for Aerial Capture. We do the Data Processing and Analytics of all aerial data captured. Aerial Data Captured includes Oblique Imagery, Visual Imagery, Thermal Imagery depending upon each of applications in its sectors for Aerial Surveying, Mapping, and Inspections. Want to know more about drone aerial mapping? Check our other blog posts or contact us for more closure.