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The Geographic Data Files (GDF) are used to model road network data for navigation purposes.
For a brief introduction and explanation of GDF, read this page,
What is a GDF file?.
The GDFViewer comprises of a set of routines that run as an add-on module within the GeoTools environment and are used to view, query, analyze and compare GDF files within the AutoCAD environment.
All commands within this module start with the prefix
IG_
Menu
: GeoTools  GDF
Viewer
Import GDF
file
Command
line : IG_IMPORTGDF
The IG_IMPORTGDF command is used to
import GDF files and display the contents of the GDF file within AutoCAD. You can import
the Level 1 Point (GDF Record 51), Line (GDF Record 52) and Area
(GDF Record 53) features with this command as well as Level 2 features
like Complex Features (GDF Record 54), Conversion Features (GDF Record 46)
and Relationship Records (GDF Record 50).
Input GDF file
:
Select:
Click on the Select button to specify the name and location of an
GDF file that you wish to import. GDF Variant : From the drop
down box you can choose the required GDF Variant. i.e. TeleAtlas,
NavTech or CEN. Currently, the program is tested only with the TeleAtlas variant.
Point Feature Import
:
Import
Method:
You can
import the Point Features in different ways. Specify your Import Method
here. All : Imports all Point Features
found in the GDF file. No filters or checks are applied.
Object ID : Imports the point feature with specified Object ID (s).
Feat Code : Imports the point feature with specified Feature Codes.
None : Does not Import the point feature. Feature Code's [comma
delimited] :
Specify the point feature code
in the text box provided, if multiple point features have to be imported
then multiple feature codes can be provided by comma separator.
Note: The feature code text box is highlighted only when you select
Feat Code in the import method
Object ID's [comma delimited] :
Specify the Object ID in the
text box provided, if multiple point objects have to be imported then
multiple Object ID's can be provided by comma separator.
Note: The Object ID's text box is highlighted only when you select Object
ID in the import method
Line Feature Import
:
Import
Method: Allows to choose the required
import method.
All : Imports with all details
like Feature code, Object ID etc.
Object ID : Imports the line feature with specified Object ID.
Feat Code : Imports the line feature with specified Feature Code.
None : Does not Import the line feature. Feature Code's [comma
delimited] :
Specify the line feature code
in the text box provided, if multiple line features have to be imported
then multiple feature codes can be provided by comma separator.
Note: The feature code text box is highlighted only when you select
Feat Code in the import method
Object ID's [comma delimited] :
Specify the Object ID in the
text box provided, if multiple line objects have to be imported then
multiple Object ID's can be provided by comma separator.
Note: The Object ID's text box is highlighted only when you select Object
ID in the import method
Area Feature Import
:
Import
Method: Allows to choose the required
import method.
All : Imports with all details
like Feature code, Object ID etc.
Object ID : Imports the line feature with specified Object ID.
Feat Code : Imports the line feature with specified Feature Code.
None : Does not Import the line feature. Feature Code's [comma
delimited] :
Specify the area feature code
in the text box provided, if multiple area features have to be imported
then multiple feature codes can be provided by comma separator.
Note: The feature code text box is highlighted only when you select
Feat Code in the import method
Object ID's [comma delimited] :
Specify the Object ID in the
text box provided, if multiple area objects have to be imported then
multiple Object ID's can be provided by comma separator.
Note: The Object ID's text box is highlighted only when you select Object
ID in the import method
Conversion Feature
Import Method
:
Allows to choose the required
conversion feature method.
All : Imports with all Features
like Point, Line, Area, Complex.
Point : Imports only point feature. Line : Imports only line feature.
Complex : Imports only complex
feature.
None : Imports no Conversion
feature.
Complex Features Import Method: Allows to choose the required
import method.
All : Imports with all details
like Feature code, Object ID etc.
Object ID : Imports the line feature with specified Object ID.
Feat Code : Imports the line feature with specified Feature Code.
None : Does not Import any Complex Features.
Relationships Record Import Method: Allows to choose the required
import method.
All : Imports with all details
like Feature code, Object ID etc.
Object ID : Imports the line feature with specified Object ID.
Feat Code : Imports the line feature with specified Feature Code.
None : Does not Import any relationship features. Miscellaneous :
Annotation
Text Height : Specify the required text
height the the text box provided.
Trace
Report GDF Linkages : Check this box to trace the
GDF linkages. Create
Individual Edges of LINE Features : Checking this box creates
individual edges of LINE feature.
Create
Individual Edges of AREA Features : Checking this box creates
individual edges of AREA feature.
.
Label
GDF Objects : Checking this box labels
all the GDF objects.
Import
Relationship Record Data : Checking this box imports
the relationship record data. With selected relationship method.
Import
GDF into memory only (do not draw in AutoCAD): Checking this box causes the
GDF data to be imported and stored in transient memory only. No
AutoCAD entities will be created during the import. This option is
especially useful to reduce processing time and system resources while dealing
with large GDF data-sets wherein you only would like to import the data
into memory and query only selected objects from memory using commands
like IG_PNTQUERY, IG_LINEQUERY, IG_AREAQUERY etc (see below for
explanation of these commands). OK :
Click on OK button to
import the GDF file with specified parameters.
Note: When you are Importing the GDF file, the program will need to
parse through the entire GDF file and build the data structure in memory.
When you run this command, the program will
display a message box as shown below, asking you whether you want to parse
the GDF file or not. If you are sure that the GDF input file is alerady
parsed and in-memory, click on the Yes button, else click on
the No button to use the information from memory.
Menu
: GeoTools GDF
Viewer
Draw/Query GDF Point Feature
Command
line : IG_PNTQUERY
The IG_PNTQUERY command is used to
draw and query a GDF point feature from memory. This command
works on the memory-built list of GDF Point features and helps you
to select and view/query/draw a
specific point feature.
Analyze/query a point feature:
Enter Point Feature ID to draw/query [ or 'S' to select from list] <>:
(do so)
Menu
: GeoTools GDF
Viewer
Draw/Query GDF Line Feature
Command
line :
IG_LINEQUERY
The IG_LINEQUERY command is used to
draw and query a GDF line feature from memory. This command
works on the memory-built list of GDF Line features and helps you to
select and view/query/draw a
specific line feature.
Draw/Analyze/query a line feature:
Enter Line Feature ID to draw/query [ or 'S' to select from list] <>:
(do so)
Menu
: GeoTools GDF
Viewer
Draw/Query GDF Area Feature
Command
line :
IG_AREAQUERY
The IG_AREAQUERY command is used to
draw and query a GDF area feature from memory. This command
works on the memory-built list of GDF Area features and helps you to
select and view/query/draw a
specific area feature.
Draw/Analyze/query an area feature:
Enter Area Feature ID to draw/query [ or 'S' to select from list] <>:
(do so)
Menu
: GeoTools GDF
Viewer
Draw/Query GDF Complex Features
Command
line :
IG_COMPQUERY
The IG_COMPQUERY command is used to
draw and query a GDF complext feature from memory. This command
works on the memory-built list of GDF Complex features and helps you
to select and view/query/draw a
specific complex feature.
Draw/Analyze/query a complex feature:
Enter Complex Feature ID to draw/query [ or 'S' to select from list] <>:
(do so)
Menu
: GeoTools GDF
Viewer
Draw/Query GDF Relationship Features
Command
line :
IG_RELQUERY
The IG_RELQUERY command is used to
draw and query a GDF Relationship feature from memory. This command
works on the memory-built list of GDF Relationship features and
helps you to select and view/query/draw a
specific relationship feature.
Draw/Analyze/query a Relationship feature:
Enter Relationship Feature ID to draw/query [ or 'S' to select from list]
<>: (do so)
Menu
: GeoTools GDF
Viewer
View GDF data
Command
line :
IG_VIEWGDF
The IG_VIEWGDF command is used to view
complete GDF information from a selected AutoCAD object. the
detail information of selected object like Point feature, Line feature or
Area feature. For example a Point feature is selected from the .GDF file
shows the following information.
The screen dumps below show
typical information that is produced from a query / view of Point, Line
and Area GDF Features.
Command: ig_viewgdf
Select object to query:
Point Feature
--------------------------------------------------------
ObjectType = Point
---------------------------------------------
GDF POINT Id = 2206
GDF FEATURE Code = 8040
Number of GDF Nodes =1
GDF NODE ID : 2231
GDF XYZ ID: 4980, Number of points stored=1
There are 1 segmented attribute ID's attached to this Point Feature
-----------------------------------------------------------------
Segmented Attribute ID = 3036
Building Name(BN): FoodWorld SuperMarket
City(CT): Bangalore
Country(CN): India
State (ST): Karnataka
Point Feature Code(FD): Others
BDA Building Number(B#): 568932G
Command: ig_viewgdf
Select object to query:
Line Feature
--------------------------------------------------------
ObjectType = Line
---------------------------------------------
GDF LINE Id = 2077
GDF FEATURE Code = 4110
from GDF NODE ID : 698
to GDF NODE ID : 1687
Number of GDF EDGE's = 1
GDF EDGE ID : 2077
(edge)from GDF NODE ID : 698
(edge)to GDF NODE ID : 1687
(edge) GDF XYZID : 3763, number of points = 6
There are 1 segmented attribute ID's attached to this Line Feature
-----------------------------------------------------------------
Segmented Attribute ID = 2077
Official Name(ON): CMH Road
Alternate Name(AN): 100 feet Road
Area Name(AR): Indirangar
Functional Road Class(FC): Commerical
Carriageway(CW): Dual Carriageway
Surface Type(SF): Asphalt
Number of lanes(NL): 2
Direction of Traffic Flow(DF): Two-Way
Length of segment(LN): 3399
Command: ig_viewgdf
Select object to query:
Area Feature
--------------------------------------------------------
ObjectType = Area
---------------------------------------------
GDF AREA Id = 1505
GDF FEATURE Code = 7121
Number of GDF FACE's =1
GDF FaceId = 1505
Number of GDF Edges = 1
GDF EdgeId = 4239, EdgeOrient = 0
(from) Node = 3134
(from) Node = 3134
GDF XYZId = 7547, Number of points = 35
There are 1 segmented attribute ID's attached to this Area Feature
-----------------------------------------------------------------
Segmented Attribute ID = 4671
City(CT): Bangalore
Country(CN): India
Land Use class(LC): Residential
State Name(SN): Karnataka
Area Name(AR): Indiranagar
Menu
: GeoTools GDF
Viewer
Extract Section
Command
line :
IG_SECTEXTRACT
The IG_SECTEXTRACT command is used to extract
the data section wise from a very large GDF file. And each section is
stored as a separate file. This is will be useful when you want to work on
some part of data from the very large GDF file. The command has the following
syntax and command sequence.
Command: IG_SECTEXTRACT
Enter master GDF file-name(~ for list) <F:\Projects\GDFViewer\UC2\UC2.gdf>:
Type ?
mark, this will pop-up a dialog box which prompts you to select the .GDF
file
Extract which sections? [ Selected/All ] <All>:
Type All,
this will read the data section wise from the .GDF file and writes each
section in the form of a separate file.
Menu
: GeoTools GDF
Viewer
Search GDF file
Command
line :
IG_SEARCHGDF
The IG_SEARCHGDF command is used to
search a selection of AutoCAD objects for a matching GDF record.
IG_SEARCHGDF
Search for GDF object type: [ Point/Line/Area ] <Point>: (do so)
Select objects to search:
Select objects: Specify opposite corner: 1503 found
807 were filtered out.
Select objects:
Enter Object ID to search and zoom to: <1889>:
Object was found. '#ename' Lisp variable exposed
Object placed in active [previous] selection.
Menu
: GeoTools GDF
Viewer
Compare GDF files
Command
line :
IG_GDFCOMPARE
The
IG_GDFCOMPARE command is used to compare two .gdf files of different
variants. It basically compares the record names and structure of two .gdf
files, and generates a report of unmatched values the report is stored in
a separate file with extension .rpt. The command has the following
syntax and command sequence.
Command: IG_GDFCompare
Enter first GDF file-name(~ for list) <F:\Projects\GDFViewer\TeleAtlas.gdf>:
Type ?
mark, this will pop-up a dialog box which prompts you to select the .GDF
file
Enter second GDF file-name(~ for list) <F:\Projects\GDFViewer\TeleAtlas2.gdf>:
Type ?
mark, this will pop-up a dialog box which prompts you to select the .GDF
file
Enter GDF compare report file-name(~ for list)
<F:\Projects\Sanjay\Compare_GDF.rpt>:Type ?
mark, this will pop-up a dialog box which prompts you to specify the path
for storing the report file.
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