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“４Ｄ”技术“４Ｄ”的术语源自美国联邦地质调查局（ＵＳＧＳ），指的是数字高程模型（ＤＥＭ）、数字正射影像（ＤＯＱ）、数字栅格图形（ＤＲＧ）和数字线划图形（ＤＬＧ）。生产“４Ｄ”系列产品的技术称为“４Ｄ”技术。“４Ｄ”技术的特点之一是以栅格数据为基本形...
The terminology for “4D” technology “4D” is derived from the United States Federal Geological Survey (USGS) and refers to digital elevation models (DEMs), digital orthophotos (DOQs), digital raster graphics (DRGs), and digital line drawings (DLG). The technology for producing “4D” series products is called “4D” technology. One of the features of “4D” technology is the basic data of raster ...