DeLorme XMap 6 Betriebsanweisung PDF herunterladen (Seite 6)

Wizard to connect to the ArcSDE database. You must provide the server name on which

the ArcSDE installation resides, the port # (instance) of ArcSDE on the server (typically

5151), and the login name and password. When you have a connection to the ArcSDE

instance, you can select available databases and use the Import Wizard or Bulk Importer to

import layers from that database.

Spatial Queries

Spatial queries allow GIS users to ask direct geographic questions about how GIS data is

spatially related. For example, “Which towns are located within a watershed?,” “Which

parcels contain toxic point source locations?,” “Which rivers are within 1,000 meters of a

road?,” “Which cities are within 100 miles of a selected city,” and so on. Spatial queries

combined with attribute queries allow you to uncover complex patterns between spatial

data layers and are a fundamental strength of a GIS. Note: XMap Professional users can

run spatial queries but cannot create them.

Buffering

Use the Buffer tool to build polygon geometries, including zero and negative buffers,

around existing geometries in a layer. The size of the buffer polygons is determined by

a user-specied linear distance around the edge of the geometries in the existing layer.

The new polygon geometries are a merged combination of the original polygons and the

buffer polygons. Buffering is often used in GIS spatial analysis when proximity issues are of

concern, such as site planning or risk assessment.

Multiple Classications

XMap-compatible DeLorme OpenSpace databases support the storage of more than one

classication against a GIS layer. The ability to create and store multiple classications

against a layer is particularly useful for rapid analysis of the data in the layer. Once the

classications are created, you can quickly switch between them for comparison to

discover trends in the data, rather than recreating each classication and applying it each

time. There is no limit to the number of classications that can be stored against a layer, but

only one classication can be active at a time. Like queries, classications are transferred

with a layer when it is duplicated or exported to an OpenSpace GIS le format.

Note: XMap Professional users can view layer classications but cannot create them.

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DeLorme XMap 6 Betriebsanweisung Seite 6