Aerial Data Acquisition

 
Mapping

Photogrammetry

Orthorectified Imagery

Orthomosaic

DSM

DTM

Topographic Map

3D Model

3D Point Cloud

GIS

CAD Data Integration

2D / 3D Site Map

Volumetric & 2D Measurement

Activity Heat Map

Plan Overlay

Feature Extraction

Crop Management

Inspection

Bridge Inspection

Gas & Oil Pipe Inspection

Asset & Plant Inspection

Maintenance Survey

Rooftop Inspections / Survey

Industrial Roof Inspection

Progress Monitoring & Reporting

Insurance

Claims Adjustment Insurance

Damage Assessment

Photogrammetry

Construction

Construction Planning

Construction Progress Monitoring

Surveying

Activity Heat Map

Plan Overlay

Feature Extraction

Photogrammetry

Orthorectified Imagery

Orthomosaic

GIS

CAD Data Integration

2D Site Map

Volumetric & 2D Measurement

Aerial View Study

Panoramic Photo

360˚ Panoramic Virtual Tour

ORTHOMOSAIC

Epic Footy uses professional image processing software for the rectification, assembly, and correction of aerial images. The resulting orthomosaic is an image that can be analyzed in any GIS or remote sensing software. 

The relative accuracy of outputs, in general terms and without ground control points, is 1-2 times the ground sample distance (GSD) horizontally (X,Y coordinates) and 2-3 times the GSD vertically (Z coordinate). For instance, a project with a GSD of 3 cm: the horizontal accuracy is about 3-6 cm and the vertical one 6-9 cm. The point cloud, DSM and consequently the orthomosaic accuracy are also affected by the quality of the initial images and their visual content. Sharp edges, trees, reflective surfaces, certain type or roads and rooftops may present locally lower accuracy. Using ground control points, the relative accuracy may improve (especially at areas with lower overlap of difficult image content).

Absolute georeferencing

 

With onboard GPS on all of our drones, our orthomosaics typically have an absolute error of only half a meter. If needed, ground control points can be integrated to give centimeter precision.

Artifact removal

 

Artifacts can be manually edited out of the orthomosaic, in order to improve the detailed appearance.

Angle specification

 

If a specific viewing angle is desired, the flightplan can be designedaccordingly and the mosaic can be manually corrected for this purpose.

Other Details

Weather

 

If weather events such as fog or cloud cover change during the flight, the resulting orthomosaic will appear blotchy and may lead to false interpretation. We therefore prefer to fly on days with steady weather conditions. Shadows on the ground have a negative effect on key point identification and increase the contrast of the image, reducing the amount of detail that can be seen. A high-altitude cloud cover is optimal.

Topography

 

For moderate elevation changes, the altitude of the drone can be adjusted to conform to the landscape and provide images with a uniform resolution. Rapidly changing elevation profiles are difficult to capture at a uniform resolution and will result in heterogeneous mosaics. The ground must have a strong texture in order to identify key points and perform image stitching. Please note, the following terrains are not favorable: large bodies of water and snow fields.

Artifacts

 

Objects with sharp edges that are higher than their surroundings are sometimes poorly recognized in some images, leading to a local distortion of the image, called an artifact. Artifacts can be avoided by increasing flight altitude or by increasing image overlap, or can be removed in the post-processing.

File Formats

 

The Orthomosaic is delivered in GeoTiff, .las point cloud, .obj or 3D file. We can also delibver the orthomossiac in practically any other professional file format upon request at additional cost.

DIGITAL SURFACE MODEL

With GPS enabled drones, we are able to take the georeferenced images and identify millions of key-points and calculate their positions. With the high resolution aerial images, we can generate point clouds and digital surface models (DSMs).

OUTPUT FORMATS

3D Point Cloud

 

The most basic product of the photogrammetric process is the 3D point cloud: a set of points defined by X, Y, and Z coordinates as well as a color.

 

Output format:

  • “.las”.

 

Some examples of compatible software:

  • ArcGIS

  • Global Mapper 

  • AutoCAD

  • MeshLab

  • 3D Reshaper

  • Trimble RealWorks Viewer

 

Applications include:

  • Visualization

  • Surface editing

  • DSM generation

  • DTM generation

Trangulated Meshes

 

A filtered point cloud can be triangulated to create a mesh model.

 

Available Wavefront output formats:Wavefront:

  • “.obj”

  • “.ply”

  • “.las”

 

Some examples of compatible software:

  • AutoCAD

  • Bentley Pointools View

  • CC Viewer

 

Applications include:

  • Rendering in animation package

  • Small projects visualization

  • 3D printing

Raster Digital Surface Model

 

A raster Digital Surface Model (DSM) is a matrix assigning an altitude to each x-y coordinate and thus takes the form of a single-band image. This image (format: geoTiff) is georeferenced and can be opened in all GIS software such as: ArcGIS, Global Mapper, AutoCAD, QuantumGIS

 

Applications include:

  • Surface analysis

  • Volume measurements

  • Contour line generation

  • Breaklinegeneration

LIMITATIONS

Weather

 

Shadows on the ground have a negative effect on key point identification and increase the contrast of the image, reducing the amount of detail that can be seen. A high-altitude cloud cover is optimal.

Land Cover

 

Forests, tall buildings, and tall thin objects such as light posts are difficult to detect because of their spatial complexity and/or stereoscopic displacement, which makes it difficult to identify key points. The result of such a failure is a sparse point cloud with insufficient detail. One solution to this challenge is to increase flight altitude, albeit at a loss of ground resolution.

Topography

 

Obstructions such as tall buildings, walls, or vegetation can reduce the local quality of the generated 3D model.

VOLUME MEASUREMENT

Epic Footy's advanced tools can measure the following:

 

  • Cut volumes

  • Fill volumes

  • 3D surfaces and Slopes

Accuracy of the measurements

 

By using aerial imagery, we can collect a high density of elevation points which result in a highly accurate volume calculation. Below are a few tests and studies that have been carried out to assess the accuracy of drones (aka unmanned aerial vehicle (UAV), unmanned aerial systems (UAS)) measuring methods for volume calculation.

 

In the following documents, drone image collection with Pix4D post-fight processing is compared to other methods like LiDAR or Global Navigation Satellite System (GNSS).

Once we have collected the images, they are processed with our powerful geoprocessing tools. With this software we are able to generate a high resolution elevation map and calculate the volume of specific objects.

 
 
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CONTACT US

469.305.1934

info@epicfooty.com 
Frisco, Texas

Work With US

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We are multimedia experts who specialize in capturing and editing stills, 360, and aerial, photography and video. We are a local 360 photography and aerial drone UAV service provider to Frisco, Mckinney, Allen, Plano, Dallas, Rowlett, Carrollton, Lewisville, The Colony, Richardson, North Dallas, Highland Village, Rockwall, Denton and the surrounding areas. 

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