There are many difficult requirements imposed on block triangulation when it is applied on a practical basis. The main problem with aerial analytical triangulation is the error occurence and the necessity of reconstructing the block model. Because a certain number of operational errors always occur, the system of block triangulation is evaluated by the way it corrects such errors with certainly while at the same time reducing total working time.
The authors of this paper have solved the problem by introducing the concept of block to block triangulation. With this concept, operational errors are kept in local and the volume of errors needing correction is minimized in total.
Requirements for computerr use on practical basis are as follows: -
1. The error check method
2. The saving of computer costs (using only core memory-300 kc)
To satisfy these requirements we have developed two concepts:
1. The concept of block to block triangulation
2. The reduction method on divided linear equation
The system which the authors of this paper have developed has a cost/performance ratio level that is nearly comparable to the usual strip type solution method.

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An approximate camera calibration method without using any photogoniometer or angle measurement was tried for the preliminary calibration of the taken camera. A flat terrain with vast quantity of canals, rivers and ditches was selected and the heights of water surface was measured with a precise plotting instrument at many points scattering over the stereo-model.
After adjustments of model inclination and the effects of the Earth's curvature, the height discrepancies at each points from the datum plane was expressed as the function of bi-polar coordinnates, which has their poles at the principal points of the two photos.
Assuming a polinomial form for the distortion, the residual bight discrepancies were computed and compared with the measured values And the distortion polinominals was corrected by iteration.
Actual analysis was carried out graphically, with not so high accuracy which can not be expected from such a approximate method. Also, the determination of the principal points on the photo-plane was not tried because of the poor resultant accuracy which may be expected from such a approximate method.

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The paper deals with digital correction of EATS MSS Bulk digital data for high resolution image data base. Geometric and geographic correction will be done by using five types of polinomials from one to five degree, for three cases of numbers of control points, that is, 45, 35 and 25 points which are selected on both of ERTS digital data and 1 : 50, 000 national base map. Accuracies for the respective cases, will be compared, for the EARTS-1 frame on Nov. 26, 1972 (ID. No. 112600484) . Accuracy will be less than one pixel RMS in the case of more than three dimensional polinomials.
The program will enable the establishment of ERTS image data base which is consisted of digitally corrected MSS data with the interval of 100 meters for each frame of 1: 50, 000 national base map. The data base is considered as well utilized data base for not only remote sensing scientists but also planners, engineers and governmental officers.

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A map gives us various kinds of informations accurately. The work to make a map is divided into many stages. In most of these stages, a lot of time and manual labour are necessary.
In order to reduce the time and manual labour, the binary dot devices are used. With the use of these devices, each element-lines, planes, characters, etc.-which constitutes a map is expressed by a set of small dots.
Many computer programs are developed in this paper, and most of them are concerned with figure processing. Actually, the map is produced for simulation.
Moreover, the method developed here can be applied to any kind of digital data, no matter what form they take. Therefore, it may be possible to use this method for the visualization of various kinds of digital data.

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