Autodesk 15606-011408-9320 User Guide - Page 170

decimal degrees, data source

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coordinate system origin The reference location for a planar coordinate system that is stored with a map. Coverage A data format that includes files created in ESRI Arc/Info. You can convert these files to latitude/longitude SDF files using the Autodesk MapGuide SDF Loader. Ctrl-click A method of selecting multiple, non-contiguous items in a list by holding down the Ctrl key, and then clicking each item you want to select. database A collection of interrelated alphanumeric data files controlled by a database management system (DBMS). Databases are structured so that the DBMS can perform rapid search and retrieval by various data elements. In Autodesk MapGuide, "database" refers to a relational database that stores attribute data, such as a database of records that contain information like population and area for each country. See also RDBMS. data extension An OLE DB data provider that can process spatial queries and access spatial data. You can purchase Autodesk MapGuide data extensions for VISION*, Oracle8i Spatial, AutoCAD Map DWG, and ArcView SHP. data source A Microsoft Data Link file, which is an ASCII text file with a .UDL extension, containing all the information required to connect to a specific OLE DB data provider. Before you can access an external database from within Autodesk MapGuide, you must configure it as an OLE DB data source. datum A mathematical model, and its calculations, that provides a smooth approximation of the Earth's surface. decimal degrees The mathematical representation of degrees in floating point values. For example, in decimal degrees, 30°30'0'' is 30.5°. degrees° minutes' seconds" The mathematical representation of degrees as minutes and seconds, where one degree equals 60 minutes and one minute equals 60 seconds. For example, in degrees° minutes' seconds", 30.5° is 30°30'0". DGN file format Microstation Design File, a data format that includes files created in Intergraph/Bentley Microstation. You can convert these files to latitude/longitude SDF files using the Autodesk MapGuide SDF Loader. digitize To convert spatially dispersed information on maps, drawings, or charts into machine-readable digital data that can be processed by computer software. Digitizing captures spatial data as x,y coordinates in digital form. display range The maximum and minimum scale at which Autodesk MapGuide will display a layer. In Autodesk MapGuide Author, you can specify that a layer will display only at certain ranges, or specify multiple display ranges for a layer and specify different attribute styles for each of the display ranges, so that the layer will be drawn differently depending on the current scale at which the map is displayed. By default, Autodesk MapGuide displays the layer regardless of the current scale. See also map scale. display styles A set of properties that define how to display data on the layer. Layers without themes typically have only one display style, which defines how to display all of the data on the layer. Layers with themes typically have multiple display styles: one for each category in the theme. You specify different properties for each display style, such as color, fill style, line width, or point symbol. Display attributes are defined for each style set on a layer. 170 | Glossary

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170
|
Glossary
coordinate system origin
The reference location for a planar coordinate system that
is stored with a map.
Coverage
A data format that includes files created in ESRI Arc/Info. You can convert
these files to latitude/longitude SDF files using the Autodesk MapGuide SDF Loader.
Ctrl-click
A method of selecting multiple, non-contiguous items in a list by holding
down the Ctrl key, and then clicking each item you want to select.
database
A collection of interrelated alphanumeric data files controlled by a database
management system (DBMS). Databases are structured so that the DBMS can perform
rapid search and retrieval by various data elements. In Autodesk MapGuide,
“
database
”
refers to a relational database that stores attribute data, such as a database of records that
contain information like population and area for each country. See also
RDBMS
.
data extension
An OLE DB data provider that can process spatial queries and access
spatial data. You can purchase Autodesk MapGuide data extensions for VISION*,
Oracle8
i
Spatial, AutoCAD Map DWG, and ArcView SHP.
data source
A Microsoft Data Link file, which is an ASCII text file with a .UDL exten-
sion, containing all the information required to connect to a specific OLE DB data pro-
vider. Before you can access an external database from within Autodesk MapGuide, you
must configure it as an OLE DB data source.
datum
A mathematical model, and its calculations, that provides a smooth approxi-
mation of the Earth
’
s surface.
decimal degrees
The mathematical representation of degrees in floating point values.
For example, in decimal degrees, 30
°
30
’
0
’’
is 30.5
°
.
degrees
°
minutes' seconds"
The mathematical representation of degrees as minutes
and seconds, where one degree equals 60 minutes and one minute equals 60 seconds.
For example, in degrees
°
minutes
’
seconds
”
, 30.5
°
is 30
°
30
’
0
”
.
DGN file format
Microstation Design File, a data format that includes files created in
Intergraph/Bentley Microstation. You can convert these files to latitude/longitude SDF
files using the Autodesk MapGuide SDF Loader.
digitize
To convert spatially dispersed information on maps, drawings, or charts into
machine-readable digital data that can be processed by computer software. Digitizing
captures spatial data as
x,y
coordinates in digital form.
display range
The maximum and minimum scale at which Autodesk MapGuide will
display a layer. In Autodesk MapGuide Author, you can specify that a layer will display
only at certain ranges, or specify multiple display ranges for a layer and specify different
attribute styles for each of the display ranges, so that the layer will be drawn differently
depending on the current scale at which the map is displayed. By default, Autodesk
MapGuide displays the layer regardless of the current scale. See also
map scale
.
display styles
A set of properties that define how to display data on the layer. Layers
without themes typically have only one display style, which defines how to display all
of the data on the layer. Layers with themes typically have multiple display styles: one
for each category in the theme. You specify different properties for each display style,
such as color, fill style, line width, or point symbol. Display attributes are defined for
each style set on a layer.