| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to correct distortion of an original picture of a map such as an aerial photograph, and also efficiently write the results of a site survey on the picture by correcting positional deviations on each point on a map picture displayed on a screen of a personal computer based on the coordinates of geographical positions of reference points. SOLUTION: In a survey at site, plural geographical reference points are selected while referring to a site situation and a picture displayed on a screen of a personal computer from a map original picture data storage medium 8, and concerning each reference point, GPS coordinate positions of the reference points are measured by using a GPS receiver 4 and a differential correction signal receiver 5. Next, coordinates on the picture are specified concerning each point on the picture corresponding to the reference points. And the coordinate positions of the reference points by GPS measurement are compared with those of each points on the picture, the positional relations of the latter are corrected with respect to the former. For such comparisons and corrections, a storage medium 6 is used where a coordinate transformation program between the geographical position coordinates and the on-picture position coordinates is recorded.
|
