Patent ID: 7015967

Claim:
An image formation system comprising: digital image data including at least one of a digital map or a photographed image; a photographed area setting section for setting a first area in which an orthogonally projected image is to be formed on the digital image data; an information setting section for setting photographing camera information relating to a camera which photographs an image from which the orthogonally projected image is to be formed; a photographed area calculating section for obtaining a second area which can be photographed based on the photographing camera information which includes at least one of an angular field of a photograph lens, a size of a photograph plane, a focal length of the photograph lens or a photograph position related to the first area, and which is set by said information setting section; a condition calculating section for calculating photographing conditions which include at least one of a photographing direction, a photographing angle or a photographing position in order to obtain a photograph image which can properly form the orthogonally projected image in the first area set by said photographed area setting section, based on the second area obtained by said photographed area calculating section, a navigation section for making an instruction for a present position where a surveyor currently exists and a place where the surveyor moves to prepare the orthogonally projected image, and a display section for displaying the photographed area, an instruction for a present position where the surveyor currently exists and a place where the surveyor moves to prepare the orthogonally projected image, and at least one of the calculated photographing conditions on the digital image data.