GeoTools e-Newsletter # 182:


GeoTools e-Newsletter # 182:

June 26, 2007
Bangalore, India

GeoTools V 8.01 Update:

Pick up this latest update from

New command added:

GT_EDGEBUILDER: (Build Tools & Drawing Cleanup Tools - Build common edges along adjacent, closed polygons):

The GT_EDGEBUILDER command is a tool useful for building edges along adjacent, closed polylines. A typical scenario in GIS data preparation or modelling involves being able to create intersection-to-intersection edges from a network of closed polygons lying adjacent to each other. While many GIS applications create a netowrk of closed polygons, very few easy and direct tools or procedures are available to create the common edges between polygons as unique, open polylines. The GT_EDGEBUILDER command was born in an attempt to fulfil this need in an easy way.

The program works on a selection of polygon boundaries and builds the unique edges betwee them. Like in every GeoTools command, it is best to start with as clean and accurate data as possible. BEFORE you start this command, it is essential that all duplicate segments from the selection are removed and cleaned using the GT_DISTANGWEED command.

Please review this command and let me know your feedback.

Bug Fixes:

GT_XP_ATT (Block Tools - Explode blocks, retain attributes as text):

There was a bug in this command which affected AutoCAD 2007 version and above only. Upon exploding the blocks, the attribute values would not get re-cerated as text. This has now been fixed. The program now correctly re-creates all attributes correctly.

GT_PL_INTER (Polyline Tools - Assign interpolated Z values to vertices): The behavior of this command has been slightly modified. If the polyline is closed AND if the first vertex is a non-zero value, the program will now use this first vertex elevation value considering it as the non-zero elevation of the last vertex and perform linear interpolated for the last stretch of the polyline.

As an illustration, in a 7-vertex closed polyline, if the elevations of Vx1=2.5, Vx2=0.0, Vx3=0.0, Vx4=0.0, Vx5=8.5, Vx6=0.0, Vx7=0.0, then this version of the GT_PL_INTER will interpolate Vx6 and Vx7 linearly between the elevations of 8.5 and 2.5. In earlier versions, this would have been left as 0.0 and not interpolated.


GT_DENSIFY command: (Polyline Toolset 1 - Densify vertices): A number of bugs have been fixed in this version. A check has been added while processing polyline whose total length is less than the Segment length to be densified. This prevents the program from crashing out when encountering polylines whose total length is less than the segment length to be densified. The Densify algorithm has been replaced with a more advanced one and the program now accepts polylines with arcs also. Until now, you could use the GT_DENSIFY command on polyline without arc segments only. This limitation has been removed now.

GT_INTEX command: (Cleanup Tools - Intersections processor): A major overhaul has been done on this command.

The 'Object Break Options' have now been implemented. You can now split a network of inter-connected lines into individual segments at each point where they intersect by enabling the 'Object Break' options. Until now, it was only possible to add interpolated vertices at the intersections but not break the polylines at these points.

GT_GENSET command: (GeoTools->Settings): A new 'Settings' option has been added here called 'Fuzzy search distance around points of interest'. This is a generic search distance parameter used in GeoTools commands when a search is required to be made around a point of interest for the existence of other 'very closeby' objects. For example, whiile searching to find if there is another polyline starting (or passing by) the ends of a polyline, you would need to apply different search distances, depending on whether your AutoCAD units are survey units like meters or feet -OR- if they are geographic units like Latitude and Longitude. While in the former case, a value like 0.01 is an acceptable search distance, in the latter case, it should be a very small value like 0.0000001. The provision of this parameter under GeoTools->Settings allows you better control of your processing needs, especially when you have to deal with geographic as well as map projection units in AutoCAD.


GDF Viewer 1.04 Beta released:
Minor changes and fixes have been made in this update. The program can nowread GDF files containing record 60. An in-built check has been placed to ensure that the program detects AutoCAD Map and will run only in AutoCAD Map, and not in plain AutoCAD versions.


Important note: While all of GeoTools commands are tested quite extensively before they are released, it is humanly impossible to test-run it under every different data type or operating environment. In the event that you notice any GeoTools command not functioning as expected, please bring it to our notice as soon as possible. We will attend to it and fix the problem as soon as possible.


Thank you for your continued support. As always, we welcome feedback at all times.

This newsletter is never sent as "spam mail"

If you wish to stop receiving this newsletter, simply send an email to "" with the subject "UNSUBSCRIBE" and you will be removed from the GoogleGroups subscription list. You can visit GoogleGroups GeoTools and un-subscribe yourself as well.

The URL for the GeoTools @ GoogleGroup is:

**** Four Dimension Technologies ****

India Office:
C-616, Natasha Golf View
[Off Airport Road]
No. 2, New Ring Road
Domlur Layout
Bangalore - 560 071
Phone : + 91-80-41625057
TeleFax: + 91-80-41625057