Using Printouts Under a Stereoscope

Stereoscopes are optical devices that help to view the two images separately and with relaxed eyes. Lens or pocket stereoscopes permit viewing the full overlap area of prints up to ~9cm x 13 cm or parts of larger prints. Mirror stereoscopes are designed to accept standard 23 cm x 23-cm metric airphotos and therefore work well also with A4/US letter-sized prints (Fig. 11-20). Most models come with magnifying options up to eight times. They are large enough for allowing the analyst to draw beneath them, so it is possible to trace objects identified in the stereoview with a pen onto one of the images or a transparent overlay. However, remember that this sketch would not have the geometric properties of a map as it contains all distortions present in the base image.

To prepare printouts for use with a stereoscope, checking and if applicable scaling them first as described above is advisable. Especially when intended to be viewed at high magnification, a high printing resolution (600 dpi minimum) is necessary, or image details would be veiled by the printing dots. High-resolution photo-quality printouts or photographic prints are best suited.

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