How accurate is Nearmap imagery?
Our latest camera systems capture Vertical (orthogonal) imagery with a ground sampling distance (GSD) of 5.6cm (2.2”) and an absolute horizontal accuracy of 19.8cm (7.8”) RMSEr. In aerial mapping applications, the ground sampling distance (GSD) represents the distance, measured on the ground, between the centres of two…
Imagery looks different at different zoom levels
Sometimes you'll notice that our imagery looks different at different zoom levels. This is because we have a multi-resolution camera system, and the overview (when zoomed out) comes from a different camera to the detail imagery.
Aligning Nearmap imagery with Cadastre boundaries (Australia)
When aligning a third party layer, such as a Cadastre boundary, with our imagery there are only a few possible reasons for any misalignments. These can be all or any of the following: Projection / Datum differences between the two layers. Accuracy of the third party layer. Accuracy of the Nearmap imagery layer. Accuracy…
Why is an obvious edge visible in some imagery?
Sometimes we may show overlapping surveys and at some places, this may affect the edges of the survey. We may fly different surveys at different resolutions and scales. For example, we may fly a very high resolution for a smaller area. If this is the case, you will have surveys of different dates shown overlapping each…
Why do the dates for 2D and 3D imagery look different?
While the 3D content date of capture will correspond with some 2D images, not every 2D capture is processed into 3D, so switching from 2D to 3D may result in viewing a scene older than the current 2D image being viewed. 3D scenes are processed over a large area and may also be made of images taken over one to three months.
Can I remove the trees and just display the buildings?
No, the 3D mesh displayed is a continuous surface. No classification or feature extraction has been performed on this layer.
How can I control the resolution of the DSM and True Ortho image retrieved?
The image resolution is determined by the image length (2 x radius) and the size in pixels. This allows us to maintain the location as the centre point of the image. Refer to the examples below as an illustration of how radius and size values determine image resolution. radius: 10 m length: 20 m size: 100x100 px pixel…
How can I get notified when my area of interest has fresh imagery?
Get notified by email as soon as your location of interest has been updated by adding it to your Watchlist. Find out more about Watchlists here: Manage Your Watchlist.
Is the radius I specify in DSM and True Ortho a true radius ?
The radius is not a radial dimension with location as centre point. The radius defines a square bounding box with location as the centre. Note also that the units are real world and not Web Mercator metres.
What geoid models are used with Nearmap's 3D imagery?
AU: AHD (AusGeoid09) US: EGM2008 Canada: CGVD2013