From his presentation: 

Geographic tools have emerged that useopen-standards and support users creating and sharing their owngeodata. Together, these tools form a GeoStack that enable the entirelifecycle of data.
This talk will discuss the technologiesthat currently comprise the GeoStack and how it is enabling users toshare and use geographic data. Developers can fit their tools into anypoint along this stack, or add to existing services. We'll also discussthe future of the geotools.

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