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Aerial Surveying Imaging Collection Accuracy Statements

ARC Aerial Imaging can safely, precisely and accurately plan to collect ~2cm GSD baseline geotagged aerial imagery and produce various geospatial products including orthomosiacs/landmaps, GeoTIFFs, 3D Google Earth layers and digital terrain and surface models. Furthermore, our services can also include providing geospatial analysis with informed consultation.

Our georeferenced products come with an accompanying Collection Accuracy Statement in the form of an Overlap Report image that is also generated during processing.  This indicates to the client and GIS end user on how many nadir images (indicated as black dots in the left Overlap Report image) contain a view of tasked survey location within the processed survey area and giving them an illustrative and informative representation on how accurate the aerial survey was conducted.

Generally, the more "looks" at a feature on the ground the system has to work with, the better the outputs will be (within reason).  The Overlap Report colour codes these numbers to inform the client when the system considers to be good or bad overlap coverage and helps them visualise the things that affect the collection of consistent overlap.

A Collection Accuracy Statement in the form of an Overlap Report image.
The finalCollection Accuracy Statement in the form of an Overlap Report image

For example 1, 2, 3, 4 or 5 views (colour coded in reds) of an area is considered to be inadequate for the purposes of reconstructing a 3D scene.  6, 7 or 8 views (colour coded in greens) are considered adequate for the reconstruction of fairly simple features like fields, basic structures or stockpiles.  For the greatest ability to reconstruct a complex scene, getting 9 or more views (colour coded in blues) is required to have the detail necessary to reconstruct complex features like buildings, trees or other vegetation.

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