[Gdal-dev] Measured Values for Shapefile read & write

[Dylan Beaudette]

On Tuesday 24 July 2007 12:32, Nelson, Dean wrote:
> Yes, I was projecting to a WSG84 from a Lambert_Azimuthal_Equal_Area
> projection (as far as I can tell) See the "[Gdal-dev] Is ogr2ogr the
> tool to use?" thread.
>
> Regards,
>
> Dean Nelson
> Enterprise Electronics Corp
>
If you are projecting across datums, then you might want to check that you 
installed GDAL/OGR in such a way that the NADGRIDS files were included. If 
you are outside of North America, then I am not sure how to go about this.

http://proj.maptools.org/


Cheers,

Dylan

>
> -----Original Message-----
> From: gdal-dev-bounces at lists.maptools.org
> [mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Dylan
> Beaudette
> Sent: Tuesday, July 24, 2007 1:53 PM
> To: gdal-dev at lists.maptools.org
> Subject: Re: [Gdal-dev] Measured Values for Shapefile read & write
>
>
> Sounds like there was some kind of NADGRID mixup.... ? where you
> projecting
> across datums?
>
> cheers,
>
> Dylan
>
> On Tuesday 24 July 2007 11:34, Nelson, Dean wrote:
> > Craig,
> >
> > We would like our product to ingest any type of shape file (projected
> > or
> > lat/lon) and be able to run with it. However, as in the "[Gdal-dev] Is
> > ogr2ogr the tool to use?" thread, I have some shapefile data from the
> > USGS/Hydro1k project that is projected from a point and all of the
> > values in the polygons are x,y values. I needed to convert to a
>
> Lat/Lon
>
> > shapefile. I did it via ogr2ogr and the resulting output was placed
>
> 17km
>
> > north of reality.
> >
> > I was looking for a kludgy fudge factor ;-)
> >
> >
> >
> > Regards,
> >
> > Dean Nelson
> > Enterprise Electronics Corp
> >
> >
> > 	-----Original Message-----
> > 	From: Craig Hunter [mailto:craigrthunter at gmail.com]
> > 	Sent: Tuesday, July 24, 2007 12:52 PM
> > 	To: Nelson, Dean
> > 	Cc: gdal-dev at lists.maptools.org
> > 	Subject: Re: [Gdal-dev] Measured Values for Shapefile read &
>
> write
>
> > 	Dean,
> >
> > 	Are you referring to an offset, in the sense you have a point on
> > a line and you want to project it 100 meters off to the left side (90
> > degrees) of the line?  In that case, no, but I'm pretty sure that can
> > already be performed with the ogr library as it is now.
> >
> > 	I'm referring to measured values (M-values) that are included in
> > the geometry and can be used for dynamic segmentation.
> >
> > 	(Sorry for the repeated message, I left the mailing list off my
> > initial reply)
> >
> >
> > 	On 7/24/07, Nelson, Dean <dean.nelson at eecradar.com> wrote:
> >
> > 		Craig,
> > 		Would this be like a projected shape file (i.e. x,y off
> > of a median) ?
> >
> >
> > 		Regards,
> >
> > 		Dean Nelson
> > 		Enterprise Electronics Corp
> >
> >
> >
> >
> > 			-----Original Message-----
> > 			From: gdal-dev-bounces at lists.maptools.org
> > [mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Craig Hunter
> > 			Sent: Tuesday, July 24, 2007 11:25 AM
> > 			To: gdal-dev at lists.maptools.org
> > 			Subject: [Gdal-dev] Measured Values for
> > Shapefile read & write
> >
> >
> > 			Hi,
> >
> > 			I performed a hack to the OGR source in order to
> > read and write shapefiles with measured values.  If others may find
>
> this
>
> > of value, I'll work on a patch?
> >
> > 			Also, the SDE driver only provides read access.
> > Is there some technical or proprietary issues with performing write
> > access to SDE? or has this not been developed due to a lack of
>
> interest?
>
> > 			Thanks,
> > 			Craig Hunter.
>
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