While some practice is required for naked-eye stereoscopic viewing, you can achieve stereoscopic vision by displaying overlapped two aerial photographs (or stereo-paired images) side by side. Aerial photographs and stereo-paired images are not included in this app. ・Naked-eye stereoscopic viewing refers to performing stereoscopic vision using only the naked eye, without tools such as stereoscopes, polarized glasses, or stereoscopic film. ・Aerial photo images shown on either side of the iPad display can be moved, enlarged, or reduced in size simultaneously using gestures (drag, pinch out, pinch in). ・The distance between two aerial photo images can be changed, freely. ・Aerial photographs can be downloaded from the Aerial Photograph Browsing Service of Geospatial Information Authority of Japan (GSI) and so on. ・If you can’t do stereoscopic viewing with only your naked eye, you can achieve stereovison with use KOKON Stereo Mirror Viewer (https://www.kokon.co.jp/book/b166146.html).