Frequently asked questions

How to georeference an image from VerticalViewer

Most GIS and cartography programs can import raster images and place them in the correct position.
Georeferencing these images is done by finding points in the image that correspond to points in reality found either with GPS data, geodesic points, gereferenced or vectorized maps.
The precision when georeferencing a vertical image respect to a map, is improved by taking the greatest possible map scale. The greater the number of georeferenciated points, the bigger the precision or coincidence wirh the used map will be. If you are interested in georeferencing images with a program, we can help you at info@aeridigitals.com

Why raster images do not coincide with the vectorial drawing?

The lower the detail of an aerial image, the easier is for it to coincide with the vectorial drawing. Ironically, we can say that the thickness of the lines of the map can help to disguise the lack of coincidence.
The more detailed the images are, the more difficult is for them to coincide. It happens, for example, that in some photos the width of a path or even its curb can bee seen, whereas the vectorial map just shows a line.

Why the images of the VerticalViewer are not merged?

This is the main characteristic of the VerticalViewer. Each photo conserves its colour and sharpness and it is not affected by the blending of colours with the contiguous photos. The greater the number of merged photos, the bigger the loss of colour will be when it comes to blend the hues of both, so that the overlap does not show. The images of VerticalViewer are high resolution ones, showing reality as it is with the maximum detail. When they are zoomed in at maximum, it does not matter wheter the edges are blend, as those edges are out of our focus point. The overlap between contiguous images guarantees that the whole of the territory is covered. The images are not retouched, nor do they modify reality as taken from the camera. No modification of the image is made in order to make it coincide with the contiguous one. Sometimes, it is better to have the same reality in two photos apart than a blend that modifies the captured image.



CONCEPTS TO CONSIDER:

ORTOPHOTOGRAPHY:

Photographic document that is obtained from the aerial photographies in which the optical deformations have been corrected and the image of the land according to the vertical orthogonal projection has been replaced.

ORTOPHOTOMAP:

Map of a photographic image, obtained to enclose ortofotographies, in which contours and topographic information have been drawn.

PHOTO-MAP:

Name that we give to our product, which consists of a moisac of loose images of vertical snaps of the territory. They have an area of overlap between them that guarantees that the whole surface of the Photo-map is covered.

VERTICAL PHOTO:

Are the images taken perpendicularly over the land that form a Photo-map. The vertical images conserve the optical deformation and are exactly as the camera shot them, without any manipulation or change of colour.

PROJECT

We call proyect to a group of vertical photos that form a PHOTO-MAP and have a relation to each other, for example a town, a rural zone or a river. All the photos have an overlap that guarantees that the whole area of the photo-map is covered.

TO GEOREFERENCE:

It is when we position a raster image of a map of bips on its geographic place. The relation that exists between a pixel of the image and its geographical coordinate is what we call a georeferenced point.