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S.Kadnichanskiy

Digital oblique images and their application. The possibility of aerial survey system A3 in taking oblique

aerial photography

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Recently, in connection with the rapid development of information technology, geographic information systems, digital aerial photography and digital methods of processing of aerial photos oblique aerial photography and the use of oblique pictures acquire a new meaning and of great importance in solving very different tasks, though it is still not universally appreciated

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Oblique aerial survey - aerial photography, the projected and the actual angle of deviation from the vertical optical axis of the camera for which are significantly different from zero values, for example, about 40 degrees

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Geo-referenced digital oblique aerial photos is a fundamentally new type of product, which is a set of digital oblique pictures with parameters of external orientation, allowing to observe objects of locality with four or more different angles of view. Compared to the usual vertical pictures they provide even inexperienced users to easily interpret the image and giving fine bump of locality

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When you use oblique aerial photos in a special software environments you can carry out the necessary spatial measurements

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What is the oblique aerial photographs can be interesting and useful for comparison with the usual vertical aerial photos?

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We don't just learn much more about the object on the image of him on the oblique aerial photo, but also understand the spatial character of the object and its parts, their three-dimensional spatial relations

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We don't just learn much more about the object on the image of him on the oblique aerial photo, but also understand the spatial character of the object and its parts, their three-dimensional spatial relations

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The advantages of oblique pictures:

* Represented objects is significantly easier to be recognized,

* Image contain much more information about the depicted objects,

* Easy to determine the nature of the spatial (in three-dimensional space) extent and forms of objects,

* Easily to define spatial (in three-dimensional space) arrangement of objects and their parts

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As a result:• compared usual vertical photos oblique picture provides even inexperienced users to easily interpret the image and navigate on it on the area• becomes easier and quicker decision making in the analysis of visual spatial data

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Oblique aerial survey is especially effective, if the subject is photographed from different angles, as a minimum, with four, which allows to observe it from different sides

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Oblique aerial survey is especially effective, if the subject is photographed from different angles, as a minimum, with four, which allows to observe it from different sides

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Oblique aerial survey is especially effective, if the subject is photographed from different angles, as a minimum, with four, which allows to observe it from different sides

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Oblique aerial survey is especially effective, if the subject is photographed from different angles, as a minimum, with four, which allows to observe it from different sides

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What's the purpose and applications oblique aerial photos are used in?

• The rapid response services - emergency medical assistance, security and rescue, fire-fighting. This is explained by the fact, that it is in these applications it is very important to quickly navigate, to determine the position of the object on the visual spatial data, assess the necessity of the situation around the object and the specific properties of the area and the object.

• For the decision making of various levels of local authorities and large enterprises, located on the large territories; information systems, operating perspective images, are very convenient continuation of (development) of the GIS.

• Realtor activity

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Up-to-date oblique aerial survey - it's aerial photography of the territory provided a solid cover by oblique photos with some of the lend l and side overlaps. Moreover, these projected overlap s depending on the orientation of direction of photographing can be constant or variable in the field of the image

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How and with what technical means are oblique aerial photos taken?

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How and with what technical means are oblique aerial photos taken?

Oblique aerial photography, as a rule, is

performed simultaneously with the vertical aerial survey and may be accompanied by a lidar survey

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Variants of technical solutions

Complex of two oblique medium format cameras and a full-frame digital camera

Ось маршрута

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Variants of technical solutions

Specialized systems, including 5 medium format cameras on a single platform

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Variants of technical solutions

Use of aerial survey system, that allows to perform the vertical and oblique aerial survey by the same camera

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Variants of technical solutions

Such a system is a system A3, which company Meridian+

has and use

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Features and advantages of the Vision system Map A3 for taking of oblique

aerial photos Oblique pictures are

obtained as a peripheral part of the large quasi panoramic pictures, covering strip - 54.8 degrees÷ + 54.8 degrees from the direction of the nadir

Olique Images

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Features and advantages of the Vision system Map A3 for taking of oblique

aerial photos Large size of the oblique

images, like for large format aerial cameras

7812 x 17450 pixels And as a result of this high

productivity of oblique aerial survey

Olique Images

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Features and advantages of the Vision system Map A3 for taking of oblique

aerial photos High spatial resolution

(small GSD) for big heights of flight

H=2300 m GSD=8 cm (β min) GSD=12 cm (β max)

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Features and advantages of the Vision system Map A3 for taking of oblique

aerial photos Aerial triangulation is performed with the use of all parts of the quasi panoramic image; as a result, the accuracy of the geo-referencing of oblique images comparable and is determined by the accuracy of aerial triangulation (comparable with the GSD)

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Features and advantages of the Vision system Map A3 for taking of oblique

aerial photos

Example of the set of parameters of oblique aerial surveyHeight of Flight 230 m

GSD min 8 cm

GSD max 12 cm

β min 25.5°

β max 54.5°

β aver 40°

Image Size 7812 x 17450

Coverage Across Flight 1500 m

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Example of A3 oblique aerial photo

H=3000 m

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Example of A3 oblique aerial photo

H=5000m

H=5000 m

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Example of A3 oblique aerial photo

H=5000 m

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Conclusions

Digital oblique aerial photographs can be successfully applied in all areas of application where you want the visual analysis and measuring the processing of spatial information - map, plan, orthophoto, but much more effective in comparison with the listed kinds of spatial data.

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Conclusions

Possessing many of the benefits for visual analysis, specific to the 3D models of the built-up areas, oblique aerial photos present a much more simple in the manufacture of a product that contains no derivative of the information about the object, but directly collected information.

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Conclusions

The advantages of using the system A3 for oblique survey can count on the high effectiveness of its use for these purpose

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Thank you for your attention