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上游一般是指单纯的传统测绘成果,也是所谓的4D产品(DLG,DEM,DRG,DOM),都是数据的初步加工产品。中游大多是基础软件和平台软件厂商,这个层面严格意义上是属于软件技术的范畴,基本与测绘技术关系不大。下游主打应用,涉及的行业最为广泛,其中包括到大众类的应用,例如,农业、林业、国土、交通、军事等,其应用五花八门、千变万化。
Upstream generally refers to the simple traditional mapping results, but also the so-called 4D products (DLG, DEM, DRG, DOM), are the initial processing of data products. The middle reaches are mostly basic software and platform software vendors, this level is strictly within the scope of software technology, basic and mapping technology has little to do. Downstream main applications, involving the industry’s most extensive, including the application to the public class, such as agriculture, forestry, land, transportation, military, etc., its wide range of applications, ever-changing.