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a#####.gdbindexes: a list of all the indexes for a data table; a#####.name.atx: an attribute index for a data table, listing the rows in the sorted order of the selected attribute column. A single data table can have multiple indices. a#####.spx: a spatial index for a feature class table to speed up shape access, using a gridded spatial index.
Starting with the 9.3 release, Esri added support for the open-source PostgreSQL database. ArcSDE serves data for the advanced ArcGIS Desktop products (ArcView, ArcEditor and ArcInfo); the ArcGIS development products (ArcGIS Engine and ArcGIS Server), ArcView 3.x as well as ArcIMS. It is a key component in managing a multi-user Esri-based GIS.
ArcGIS Online is a web application allowing sharing and search of geographic information, as well as content published by Esri, ArcGIS users, and other authoritative data providers. It allows users to create and join groups, and control access to items shared publicly or within groups.
In 1989, Esri created the Esri Conservation Program to assist in changing the operations of non-profit organizations for their objectives of nature conservation and social change. Esri’s ArcGIS platform has provided GIS data, analytics software, and training to thousands of non-profit organizations and individual conservation projects since 1993.
It is developed and regulated by Esri as a mostly open specification for data interoperability among Esri and other GIS software products. [1] The shapefile format can spatially describe vector features: points, lines, and polygons, representing, for example, water wells, rivers, and lakes.
The binary format is widely used within Esri programs, such as ArcGIS, while the ASCII format is used as an exchange, or export format, due to the simple and portable ASCII file structure. The grid defines geographic space as an array of equally sized square grid points arranged in rows and columns.
Tables can be set to inherit their characteristics from a parent table. Data in child tables will appear to exist in the parent tables, unless data is selected from the parent table using the ONLY keyword, i.e. SELECT * FROM ONLY parent_table;. Adding a column in the parent table will cause that column to appear in the child table.
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