Digital areotriangulation on the Helava digital scanning workstation DSW 100

Dietrich G. Haumann

doi:10.1117/12.227888

1 December 1995 Digital areotriangulation on the Helava digital scanning workstation DSW 100

Dietrich G. Haumann

Proceedings Volume 2646, Digital Photogrammetry and Remote Sensing '95; (1995) https://doi.org/10.1117/12.227888
Event: Digital Photogrammetry and Remote Sensing '95, 1995, St. Petersburg, Russian Federation

Abstract

The revolutionary development of electronic computers from the mid-60s onward, allowed the development of powerful programs for the computation of aerotriangulations (AT). Since the end of the 80s the further explosion in computer-speed and storage-capacity from mega to gigabyte allowed the next step into digital photogrammetry and also to digital aerotriangulation (DAT). The HELAVA DSW 100 opens the possibilities to handle AT with digital data, thus moving away from the actual photograph to scanned digital information, originating from aerial photography or other imagery. It consists of a high-precision scanner, with two CCD sensor cameras and linear encoders for very precise positioning. The actual measurement is done by automatic picture-correlation with the DCCS Software module. The selection of tie and other points can be done on paperprints, no point-transfer-device is needed. The measured picture coordinates are further processed using some existing AT-programs, such as PAT-B ALBANY or in our case BLUH. So far more than 2000 models have been processed. The triangulation data have been used for consecutive work. We could not detect any discrepancies in these consecutive works. For some 40 models, we could compare DAT results with those of a conventional AT, for which an analytical stereoplotter and pugged carry-over-points were used. The results of the DAT were more accurate by a factor of 0.7. Care has to be taken in point-selection, that no disturbing picture-detail complicates automatic correlation. This may be overcome by manual correlation but with inferior accuracy. DAT is certainly a very powerful tool and applicable to a wide range of projects.

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Dietrich G. Haumann "Digital areotriangulation on the Helava digital scanning workstation DSW 100", Proc. SPIE 2646, Digital Photogrammetry and Remote Sensing '95, (1 December 1995); https://doi.org/10.1117/12.227888

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KEYWORDS

Photography

Digital photography

Cameras

Computing systems

Analog electronics

Astatine

Image processing

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