DeLorme XMap 6 Guia do Utilizador descarregar pdf (Página 8)

duplicates of their counterparts within the database and don’t allow ﬁltering of attribute

ﬁelds during export; however, you can use queries to ﬁlter geometries and attribute

records.Allexportedlayersareinthelatitude/longitudecoordinatesystemandWGS1984

datum.

Importing from an ArcSDE 9.2 or 9.3 Database

XMap 6 GIS Enterprise allows you to import layers directly from ESRI ArcSDE databases to

DeLorme databases. To import layers, use the Connect to Database utility in the GIS Import

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. You can import from ArcSDE 9.2 databases with all

versions of XMap 6. You can import from ArcSDE 9.3 databases with XMap 6.2.

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 6 Professional users can

run spatial queries but cannot create them.

Buffering

Use the Buffer tool to build polygon geometries 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 output 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 Classiﬁcations

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

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 33 34

Sem comentários

DeLorme XMap 6 Guia do Utilizador Página 8