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THE USE OF MULTIPLE DATA SOURCES IN THE PROCESS OF TOPOGRAPHIC MAPS UPDATING

机译：在地形图更新过程中使用多个数据源

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The methods used in the process of updating maps have evolved and become more complex, especially upon the development of the digital technology. At the same time, the development of technology has led to an abundance of available data that can be used in the updating process. The data sources came in a great variety of forms and formats from different acquisition sensors. Satellite images provided by certain satellite missions are now available on space agencies portals. Images stored in archives of satellite missions such us Sentinel, Landsat and other can be downloaded free of charge. The main advantages are represented by the large coverage area and rather good spatial resolution that enables the use of these images for the map updating at an appropriate scale. In our study we focused our research of these images on 1: 50.000 scale map. DEM that are globally available could represent an appropriate input for watershed delineation and stream network generation, that can be used as support for hydrography thematic layer update. If, in addition to remote sensing aerial photogrametry and LiDAR data are ussed, the accuracy of data sources is enhanced. Ortophotoimages and Digital Terrain Models are the main products that can be used for feature extraction and update. On the other side, the use of georeferenced analogical basemaps represent a significant addition to the process. Concerning the thematic maps, the classic representation of the terrain by contour lines derived from DTM, remains the best method of surfacing the earth on a map, nevertheless the correlation with other layers such as Hidrography are mandatory. In the context of the current national coverage of the Digital Terrain Model, one of the main concerns of the National Center of Cartography, through the Cartography and Photogrammetry Department, is represented by the exploitation of the available data in order to update the layers of the Topographic Reference Map 1:5000, known as TOPRO5 and at the same time, through the generalization and additional data sources of the Romanian 1:50 000 scale map. This paper also investigates the general perspective of DTM automatic use derived products in the process of updating the topographic maps.
机译：更新地图的过程中使用的方法已经发展并变得更加复杂，尤其是在数字技术的发展时。与此同时，技术的发展导致了丰富的可用数据，可以在更新过程中使用。数据源以不同采集传感器的各种形式和格式出现。现有卫星任务提供的卫星图像现在可以在太空机构门户网站上提供。存储在卫星任务中的档案中的图像如此美国Sentinel，Landsat等，可以免费下载。主要优点由大的覆盖区域和相当良好的空间分辨率表示，这使得能够以适当的比例使用这些图像以进行地图更新。在我们的研究中，我们将我们的研究专注于1：50.000尺度地图的这些图像。全局可用的DEM可以代表流域描绘和流网络生成的适当输入，可以用作水文专题层更新的支持。如果除了遥感空中摄影测图和LIDAR数据之外，还提高了数据源的准确性。 OrtophotoImages和数字地形模型是可用于特征提取和更新的主要产品。在另一边，使用地理学设计的类似群地图代表了该过程的重要补充。关于主题地图，来自DTM的轮廓线的地形的经典表示仍然是在地图上浮出地球的最佳方法，尽管如此与诸如流行的其他层的相关性是强制性的。在目前国家数字地形模型的国家覆盖范围的背景下，通过制图和摄影测量部门，通过制图和摄影测量部门的国家中心的主要问题之一是由可用数据的开发来提取更新的层地形参考图1：5000，称为TOPRO5，同时通过罗马尼亚语的泛化和附加数据来源1:50 000刻度图。本文还调查了DTM自动使用衍生产品在更新地形图的过程中的一般视角。

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