DTM generation and bird eye view generation using a personal computer
Suits Visehsin(Talland),Shunji Murai (Japan)
Institute of Industrial Science.
University of Tokyo
7-22, Roppongi, Minato-ku, Tokyo 106
Abstract
Software for digital terrain model (DTM) generation and bird-eye view enervation using a personal computer has been developed. The software is divided into two parts. One is the DTM generation to generate slope aspect. Slope gradient and relief shading of the terrain. The other is the bird-eye view generation to generate a bridge view image of the te5rain from any view direction and any depression angle. The bid eye view generation can also be used to produce a superimpose image between DTM data and other satellite data.
Introduction
Recently, demand on digitized map information of high precision and regular grid digital terrain model (DTMS) have become larger and larger in various fields. Since computers come to play an important role in photogrammetry and remote sensing, many procedures can now be processed faster than before.
Within the last few years, microelectronics, especially personal computer technology, has made a remarkable progress. The DTM generation and bird-eye view generation, which earlier were possible only with expensive large sale computer system, have become somewhat feasible with personal computers.
The objective of this study is to utilize the advantage of personal computers to develop a cheap system for generating DTM and bird-eye view image data.
Personal Computer Hardware Configuration
Fig. 1 shows the hardware configuration of the personal computer used for this system. The computer is a NEC PC 9801 RA5. The computer system consists of 32-bit microprocessor as CPU. Mathematical coprocessor. 640 KB main memory, 256 KB graphic memory, 20 MB or 40 MB hard disk drive, dual 5" floppy disk drives, analog color display, mouse and a keyboard. An optional image memory card (SUPER FRAME) is used for display of the image data.
This software can actually work on any 16-bit NEC computer (ie. NEC Pc -9801 Vm/Vx) but the processing time will then increase.
Fig. 1 Hardware conflguration of the system
Software Functions
The software has been named DTMAN (Analysis). Fig. 2 shows the functions which are available.
Fig.2 Outline of the software
