Hi Nathan,
I've just checked a couple of shape files that I've recently created via
the method outlined below and the header information seems reasonable,
and the reading code isn't complaining about file length mismatches.
- Don
Reese, Nathan wrote:
>
> Don,
>
> I have reworked my shapefile generation code to use the classes
> suggested. See the code fragment below.
>
> EsriGraphicList polygonList = new EsriPolygonList();
> DbfTableModel polygonModel = new DbfTableModel(7);
>
> //Build graphics
> while (ellipses to add) {
> OMEllipse ellipse = new OMEllipse(centerPoint, majorAxis,
> minorAxis, Length.NM, Math.toRadians(azimuth-90));
> float[] ellipsePoints = ellipse.createLatLonPoints();
> OMPoly polyGraphic = new OMPoly(ellipsePoints,
> OMGraphic.DECIMAL_DEGREES, OMGraphic.LINETYPE_GREATCIRCLE);
> polygonList.add(polyGraphic);
>
> ArrayList<String> attributes = new ArrayList<String>();
> ...
> polygonModel.addRecord(attributes);
> }
>
> //Write files
> EsriShapeExport ese = new EsriShapeExport(polygonList, polygonModel,
> "testShapefile");
> ese.export();
>
>
> The shapefile generated with the reworked method is identical to the
> shapefile generated with the original method, including the file
> length header field. Have you had a chance to dig into the length
> generation code and see if anything is amiss?
>
> Thanks,
>
> Nathan
>
>
> -----Original Message-----
> From: Don Dietrick [mailto:dietrick_at_bbn.com]
> Sent: Tue 10/20/2009 11:33 AM
> To: Reese, Nathan
> Cc: openmap-users_at_bbn.com
> Subject: Re: [OpenMap Users] shapefile header fields, File Length
>
> Hi Nathan,
>
> I admit I haven't tested this method of doing this, but your code
> looks like it should work. I'll give it a shot later.
>
> If I were going to create a shape file, I'd do something like this;
>
> OMGraphicList omgl = new OMGraphicList();
>
> ... add OMGraphics to omgl
>
> DbfTableModel dbf = new DbfTableModel(..);
>
> ... add entries appropriate for OMGraphics
>
> EsriShapeExport ese = EsriShapeExport(omgl, dbf, my_file_path);
> ese.export();
>
> - Don
>
> On Oct 20, 2009, at 10:44 AM, Reese, Nathan wrote:
>
> > I am creating a shapefile with polygons. Below is the code fragment
> > that I am using to generate a shapefile, I have omitted dbf and shx
> > code for simplicity. Let me know if you need any additional
> > information.
> >
> > EsriLayer polygonLayer = new EsriLayer("testShapefile",
> > ShapeConstants.SHAPE_TYPE_POLYGON, 7);
> >
> > //Build dbf table
> > ...
> >
> > //Build layer
> > while (ellipses to add to layer) {
> > OMEllipse ellipse = new OMEllipse(centerPoint, majorAxis,
> > minorAxis, Length.NM, Math.toRadians(azimuth-90));
> > float[] ellipsePoints = ellipse.createLatLonPoints();
> > EsriPolygon poly = new EsriPolygon(ellipsePoints, 1, 0);
> > ArrayList<String> attributes = new ArrayList<String>();
> > ...
> > polygonLayer.addRecord(poly, attributes);
> > }
> >
> > //Write file
> > FileOutputStream shpFileStream = new FileOutputStream
> > ("testShapefile.shp");
> > ShpOutputStream shpStream = new ShpOutputStream(shpFileStream);
> > EsriGraphicList list = polygonLayer.getEsriGraphicList();
> > int[][] imageData = shpStream.writeGeometry(list);
> >
> > //write dbf and shx files
> > ...
> >
> > shpFileStream.close();
> >
> >
> > Thanks,
> >
> > Nathan
> >
> > -----Original Message-----
> > From: Don Dietrick [mailto:dietrick_at_bbn.com]
> > Sent: Mon 10/19/2009 2:37 PM
> > To: Reese, Nathan
> > Cc: openmap-users_at_bbn.com
> > Subject: Re: [OpenMap Users] shapefile header fields, File Length
> >
> > Hi Nathan,
> >
> > The file length is calculated for the shapes being placed in the
> > file. What kind of shape type are you creating a file for, and what
> > classes are you using to do it?
> >
> > - Don
> >
> > On Oct 19, 2009, at 1:41 PM, Reese, Nathan wrote:
> >
> > > I am having problems opening shapefiles generated with OpenMap using
> > > various GIS applications (although the shapefile can be opened in GE
> > > and with ArcGIS). The shapefiles can only be opened by all GIS
> > > applications by first opening and resaving the file with ArcGIS.
> > >
> > > I have compared the orginal .shp file with the ArcGIS updated .shp
> > > and have found that the only difference is in the File Length field
> > > in the main file header (byte 27). I have tried using the ShapeFile
> > > class to display the shapefile header information, but that utility
> > > always returns a value of 100 for the File Length. Has any one
> > > experienced these types of problems. Does ShpOutputStream properly
> > > set the File Length field in the main file header?
> > >
> > > Thanks,
> > >
> > > Nathan
> > >
> >
> >
> >
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > Don Dietrick, openmap_at_bbn.com
> > BBN Technologies, Cambridge MA, USA
> > http://openmap.bbn.com
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> >
> >
> >
> >
>
>
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Received on Mon Oct 26 2009 - 17:30:49 EDT