By John E. Harmon
Delivering a detail-oriented advisor to the strategic making plans and implementation of GIS, Harmon (geography, significant Connecticut collage) and Anderson (a undertaking administration advisor) talk about each one step of the advance strategy - from wishes evaluate to interacting with the procedure. particular chapters specialise in features like database schema, designing spatial info, characteristic facts, the makes use of of remotely sensed info, info improvement and conversion, and and software program choice. Case reviews show how quite a few thoughts play out in perform.
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Software vendors that have many users of a particular sort, however, have constructed template database schema that can be 47 48 Designing the GIS Database Schema customized. But even the task of customizing an existing schema in a complex organization that is planning to construct a large geographic database that integrates most of its existing data and incorporating new data tables into that schema ought to be done by highly skilled database administrators and designers. From the perspective of the users of the geographic data, who may be a minority of the total set of users, it is important that your geographic feature tables be correctly linked to the other tables you need to do your jobs.
There are 26 departments in this municipality, and prior to implementing system, 20 people in these departments made a change in some document, spreadsheet, or database. Each change took approximately 5 minutes to make on average. The one person now only spends 250 hours annually making this change, and 4,750 hours of staff time is gained on an annual basis. This community on average has a high rate of name changes, but experience has shown that virtually every agency has this type of redundancy in many of its systems including accounting, permitting, and taxation.
These layers are typically used for planning applications. Street sweeping, snow plowing, and school bus routes are examples of layers that require a considerable amount of planning before they are defined, but once they are defined, they do not change very often throughout the year. 35 Before Design: Needs Assessment and Requirements Analysis 36 ◆ As outside source updates. These layers are created and maintained by an outside source. Once they are created, they are not often updated by these agencies; therefore there is no need to update them unless changed.
