PolygonZ and ESRI Shape Format
Tim Rideout
I have a customer who is using third party software called SSRS which can read in ESRI shape files.
So I used the Universal Translator to convert the polygons into a .shp file, but he couldn’t read it as it kept saying:
The spatial data type PolygonZ is not supported or this is not a valid shape file.
It is a valid shape file, though, as I can open it in ArcView 3.2 (which dates from about 2003) and in MapInfo.
If I go back to files translated by an old copy of MapInfo, though, say before 2010, then he can read them. I have just installed MapInfo 9.5 which dates from 2008 and re-translated these files for a final test, but I suspect they will work. The .shp files (for the same Tab file source) are significantly smaller when translated with MapInfo 9.5 than when using 11.5.
So has there been a change in FME and / or the Shape format, and what is ESRI PolygonZ?
Many thanks
Tim
Dr Tim Rideout
Director
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Thomas Bacon
Hi Tim,
I’ve had a similar problem when trying to load data onto a Highways Agency online asset management system. Converted files get rejected as they are 3d shapefiles rather than the accepted 2d shapefile format. Not sure exactly when this change happened, but I noticed it when I upgraded from 9.5 to 11.5. I would be interested to find out if there’s a way to create a 2d shapefile from UT in v11.5+.
Tom Bacon
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Uffe Kousgaard
Yes, later versions of MI has started adding the Z-coordinate to all SHP files.
This means the files grow in size (for no reason) and are not supported by all software reading SHP files.
It is a bug in my mind, since TAB files do not have Z-coordinates.
http://en.wikipedia.org/wiki/Shapefile
Regards
Uffe Kousgaard
Tim Rideout wrote:
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Data Directions
Tim,
If you (or your client) have the ArcGIS 3rd party extension, ET GeoWizards, you can use choose ET GeoWizards > Convert > Shape Z(M) to Shape to convert to a “regular polygon” that can be used in ArcGIS.
I use this as part of my workflow whenever I use the Universal Translator (in MapInfo) to create Shapefiles.
Regards,
Bill
Tim Rideout
Thanks for that, seems to explain everything. So I just need to keep a copy of MapInfo 9.5 installed for whenever we run into this problem.
I have certainly noticed the shape files are generally at least double the size of the tab version.
Regards
Tim
Dr Tim Rideout
Director
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From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Tim Rideout
Sent: 04 March 2014 10:29
To: mapi...@googlegroups.com
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Andrew Harfoot
Cheers,
Andy
-- Andy Harfoot GeoData Institute University of Southampton Southampton SO17 1BJ Tel: +44 (0)23 8059 2719 Fax: +44 (0)23 8059 2849 www.geodata.soton.ac.uk
Andrew Harfoot
shape_pointz with shape_point
shape_polylinez with shape_polyline
shape_polygonz with shape_polygon
This roughly halves the size of the resulting .shp files as people have mentioned.
Looking at the UT guide from the MI doc folder, there is also a command line switch that can be used to specify the type of Shapefile produced, however, this seems to make no difference when invoked (the resulting shapefiles are still 3D).
Cheers,
Andy
On 04/03/2014 11:12, Tim Rideout wrote:
Thomas Bacon
Andy,
I also tried that command line switch with no success. Thanks for the heads up on the mapping file though, I think that’s probably the easiest solution in my case until I get upgraded to v12.
Best regards,
Tom Bacon
GIS Engineer, Mouchel
T 01444 472380 │ E thomas...@mouchel.com │ W www.mouchel.com
Our values: innovation │ excellence │ integrity │ responsibility
From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Andrew Harfoot
Sent: 04 March 2014 12:02
To: mapi...@googlegroups.com
Ross Nixon
I was going to look for that option myself, but now I know not to bother.
I am using the UI for conversions, but may look at ogr2ogr - thanks for the hint.
Ross
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Mats Elfström
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