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本文研究了数字摄影测量功能在地理信息系统(GIS)中的实现问题。摄影测量作为一种数据获取手段具有广泛的用途,其面临的主要障碍是需要使用复杂的量测仪器。但是,在影像分析中,如能在工作站上实现摄影测量制图和三角测量的功能。就可以从根本上解决解析仪器的价格问题。这样的系统不仅易于给非摄影测量人员使用,而且还能直接运用于数据库环境。本文给出了数字摄影测量系统作为一个现有GIS软件模块的概念。在工作站环境下,摄影测量全部的功能可以得到实现,其中从航空像片和卫星影像生成数字高程模型和数字正射影像是GIS的两个重要层次。所发展的软件不仅限于数字测图,而且可用于高精度航空或卫星三角测量。立体影像能直接显示于工作站像屏上,可半自动化进行定位采集。这样,分析人员能在一个统一的系统框架上精确地将数字航空影像与卫星数据结合起来运用。
This paper studies the implementation of digital photogrammetry in geographic information system (GIS). Photogrammetry has a wide range of uses as a means of data acquisition, and the major obstacle it faces is the need to use sophisticated measurement instruments. However, in image analysis, photogrammetry and triangulation can be done on a workstation. You can fundamentally solve the price of analytical instruments. Such a system is not only easy to use for non-photogrammetric personnel but can also be used directly in a database environment. This paper presents the concept of a digital photogrammetric system as an existing GIS software module. In the workstation environment, all the features of photogrammetry can be realized. The generation of digital elevation models and digital orthophotos from aerial photos and satellite images are two important levels of GIS. The software developed is not limited to digital mapping and can be used for high-precision aerospace or satellite triangulation. Stereoscopic images can be directly displayed on the workstation screen, semi-automatic positioning acquisition. In this way, analysts can accurately combine digital aerial images with satellite data in a unified system framework.