StereoWebMap is a product which has been developed by the companies Sigrid and Acotel, along with the collaboration of the investment and services agency of Castile and Leon ADE, the agrarian technological institute of Castile and Leon (ITACyL), (whom have created all the images which we use) and also the agro alimentary and agrarian technological centre.

The traditional cartographic navigations systems only allow you to measure the length and the area of a given land. With StereoWebMap you have the ability to measure the height of the land as well. We now have a new dimension in our hands: the 3D dimension. Moving from the traditional 2D to 3D dimension has enabled us to appreciate the orographics of the land: inclines, declines etc. As well as this, we use photo-interpretation, with richer colours and visuals. StereoWebMap is based on the technique of stereoscopic imaging, applied to all images obtained from photometric flights.

In order to use StereoWebMap, a connection is needed between the internet and special glasses. These glasses can be of two types; Anaglyphic glasses (if you want to make your own click here) or stereo glasses.

:: The fundamentals of stereoscopic imaging ::

Our eyes can capture two different images from two different points. This is due to the interocular distance between the eyes, which usually varies between 45 and 75 mm. The most common distance is 65mm.

These two images are interpreted as one image, depending on the extent of disparity of the captured images.The greater the interocular distance and disparity leads to a better observation of the far away objects.

In order to view these past examples correctly, it is vital to have two images which have the same brightness, intensity and contrast: and of course be showing the same caption.

:: Anaglyphic ::

A system of visualising images in 3 dimensions, consisting in the use of complimentary colour filters, such as: red-blue, red-green, red-cyan or amber-blue. For example, the image shown in red is not seen by the eye which has the filter of the same colour, yet the blue, green or cyan images can be seen. This system, due to its low cost of production, is now being used in things such as publications, computer screens and cinemas.

:: Polarized System Imaging ::

A system of visualising 3D images by presenting an alternating sequence of left and right hand images. This synchronized with glasses equipped with Liquid Crystal Shutters (LCS or LCD, Liquid Crystal Display glasses); means each eye only sees its corresponding image. A higher frequency enables the flickering created to go unnoticed. It is used in computer screens, TV and the new generation of 3D cinemas. This system requires the use of stereo glasses, when the polarization affects the screen it also effects the polarization of the glasses at the same time through the use of the filter.

:: The Application of the Stereoscopic Technique ::

The stereoscopic technique especially with the combination of photography has been used in many different areas. With StereoWebMap, you no longer need to use the old stereoscopes to view images. You only need the internet, and this system can be set up on your computer at home or at work, with no need of extra equipment.

The most important use of StereoWebMap, resides in its ability of photo-interpreting any given territory. It does this by combining the base of the image in raster format, with vectorial layers all of which is seen in 3D. Another highlight of this system is that you are able to scan of the whole imaging, viewing different parts of the image and your own pace thanks to the movable cursor and mouse.

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StereoWebMap is a product of Sigrid S.L. and Acotel S.A. © 2007

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