About Nearmap Content

Nearmap's range of content products are derived from images containing metadata. These images are generated from individual aerial photos that are automatically captured from an aircraft making regular or scheduled flights over very large survey areas of entire cities or regions, usually between 700km2 and 10,000km2.

Coverage

The questions our customers ask us most are: where do we fly, how often do we update our imagery and how accurate is our imagery.

At Nearmap, w e regularly capture urban and regional areas across Australia, the United States, New Zealand and Canada — multiple times a year, bot h leaf-on and leaf- o ff. All imagery is timestamped and delivered to you via the cloud in just a few days.  Learn more about our coverage program, include where you can watch for updates.

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Accuracy

Our current generation camera system captures data with a ground sample distance (GSD) of 5.5cm (2.2”) in vertical imagery with a horizontal accuracy of 19.8cm (7.8”).  Read more about the accuracy of our imagery and how it is georeferenced.

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First imagery dates - We have captured imagery of Perth since November 2007. Sydney, Melbourne, Adelaide, and Brisbane images go back to late 2009. United States image captures began in 2014. No prior imagery is available.

Nearmap Imagery and Privacy

Nearmap’s aerial photos are taken from overhead and are at a much lower resolution compared to street level photos.

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Nearmap Content Types

If you already have a Nearmap subscription, it will include at least one of our content types. This section introduces our content types and provides links where you can find out more. Note that you may need to upgrade your subscription to include each of the content types described below.


Nearmap Vertical (2D)

This is Nearmap's flagship high resolution aerial view (top-down) 2D imagery. 


ACCURACY AND MORE SPECS


Nearmap Oblique

Nearmap Oblique lets you view a location from multiple directions, offering a 45-degree view of the world.

Quickly measure the height of structure s and vegetation , or measure roof area and slope to better contextualise your environment. 



ACCURACY AND MORE SPECS


Nearmap Panorama

Nearmap Panorama imagery offers a 45-degree angle view of a location and  can be viewed from each cardinal direction in MapBrowser using the compass tool. You can view Panorama in MapBrowser, however for accurate measurements, use Oblique imagery. In addition, Nearmap provides access to its Vertical and  Panorama Imagery  via a Tile API.  


ACCURACY AND MORE SPECS


Nearmap 3D

Immerse yourself in photorealistic city models with 3D Viewer . Obtain elevation data , or measure heights and distances between buildings with this powerful feature available through MapBrowser and via the DSM And True Ortho API.


ACCURACY AND MORE SPECS


Nearmap AI

The built environment is a rapidly changing place. Use Nearmap AI to enrich your data with a higher quality result, at greater scale, and updated more regularly.

Export our AI data for analysis with either geospatial software or a simple spreadsheet.


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Glossary

For more definitions, including those below, see the full Glossary.

TermDescription

Absolute Accuracy

How closely a map feature location matches its real-world counterpart.

Also Absolute Horizontal and Absolute Vertical Accuracy.

DatumA model of the earth that is used in mapping. The datum consists of a series of numbers that define the shape and size of the ellipsoid and it's orientation in space. A datum is chosen to give the best possible fit to the true shape of the Earth.
Ground Sample Distance (GSD) 

The area on the ground represented by each pixel in a digital orthoimage. The smaller the pixel, the more detail visible in the image. The distance on the ground between camera samples (pixels) during PhotoMap capture; indicates the level of detail. The GSD value depends on the camera type, the flight altitude and image angle for oblique. Since the flight altitude varies between surveys, content originating from the same camera source may have slightly different GSD.

Horizontal Measurement PrecisionPrecision of measurement between two well-defined features at ground level in an image, accounting for digitisation error and relative accuracy of the features. Measurement of features above ground level is subject to larger parallax error.
Image Bands

The three bands (red, green and blue) needed to display a colour image.

Projection 

The systematic transformation of points on a globe into points on a planer map Nearmap: MapBrowser uses the Web Mercator projection. 
Root Mean Square Error (RMSE) Root mean square error, used to measure the differences between values predicted by a model and the values actually observed.
RMSErRoot mean square error (radial) measures the horizontal accuracy.
RMSEzRoot mean square error (in z) measures the vertical accuracy.



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