Accurate Understanding of Geodatabase

Geodatabase is a brand new spatial data model introduced by ESRI in arcgis8. it is a unified and Intelligent spatial database built on the relational database management information system. It is a new data model developed on the basis of the new integrated data storage technology. Implements unified data management that cannot be completed by all spatial data models (including coverage and shape) before Geodatabase, that is to say, in the framework of a common model, the geographical spatial features such as vector, grid, tin, network, and address that GIS normally processes and expresses are described in the same way. At the same time, geodatabase is an object-oriented geographic data model. Its geospatial features are more similar to our understanding and Expression of realistic object than previous models.

Shape is a data format launched by arcview2.0. It is fully formatted. Learning Because traditional CAD data is insufficient to characterize geographical data, the attribute information is first linked to spatial information through DBASE tables. Therefore, ESRI has become a leader in the GIS field. While fully absorbing the advantages of shape, coverage adds topology and other new features, and shows its advantages in ESRI's ARC/INFO workstation, as a result, ESRI was pushed into the ranks of world-class GIS companies and IT companies. Geodatabase is the source of today's development. It is the product of rapid development of database technology and object-oriented technology. It fully absorbs many new idea in the software industry, integrates with the geographic data model. String 9

From the generation and development of the above three data formats, ESRI companies launched in each data format are not rashly launched. They all have huge demands and vacancies in the market, it is also technically available in the form of a data format + software package, because a data format must have its own mother, it is difficult to reflect the advantages of this format without a mother, it is achieved through displaying the data format and the form of your own software package and another commodity. On the surface, ESRI's software is very expensive and its performance is superior, but what is actually expensive and superior is its data GPS format, its ArcView, pc arc/INFO, and today's ArcGIS are all based on better representation of their corresponding spatial information formats.

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If we can see this, I believe that for the GIS industry, spatial data organization, database, and data model are much more important than GIS software. Therefore, we must become a good GIS expert, its database level and the level of understanding of spatial information organization are higher than the level and ability of its software design.

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Return to Geodatabase because it absorbs the latest technologies, such as databases and object-oriented systems, therefore, when considering, understanding, and designing a Geodatabase, we should re-return to the database and object-oriented technology itself, when we fully understand the basic theories of the two, we can add our own geo stuff to it. After all, Geodatabase wants an octal mirror compared to several previous data formats, if we look at it from one aspect, it is very beautiful, but only when we fully understand the basic principles can we truly jump out of the three boundaries, not in the five lines, only then can we see its full picture and truly appreciate its beauty. Of course, all new things are accepted. We can't eat fat people, but it also takes time to iterate.

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Currently, ArcGIS introduces geodabase to supplement and promote coverage and other data formats, but does not immediately replace coverage. Of course, it is impossible to replace it until today, still in the era of coexistence of CAD, shape, and coverage, is the same for China and the United States? We should clearly see that CAD \ shape \ coverage can fully meet the needs of project engineering and various applications, that is, the folk (this word is a point of concept) it has not yet produced the kind of desire enthusiasm like CAD -- GIS in the past, but it is also similar to process-orientedProgramLike the design, it is no accident that the age will accept the strong after fully enjoying the advantages it brings. This is the most basic theoretical application of the materialism concept of development. String 1

Therefore, I think that if the benefits of integrating feature behavior (object-oriented advantage) and storing all data in the database exceed those of data conversion, it is a great victory for Geodatabase. Back to the starting point, it is still object-oriented and database technology. As long as these two technologies flourish, the development space of geodatabase is immeasurable.

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