[OSM-newbies] How to convert NAD83 to latitude/longitude?

[Kelly Jones]

Thanks, Gabriel. I couldn't get ogr2ogr working (perhaps because I'm
using dbf files?), but invproj worked great. I spot-checked the
answers and they appear accurate. I couldn't figure out how NAD83 ==
EPSG2258, but the results seem to bear this out.

Next question (for anyone): how do I batch upload data that's NOT a
GPS track and isn't in GPX format? In other words, how do I upload raw XML?

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On 12/28/07, Gabriel Ebner <ge at gabrielebner.at> wrote:
> On Thu, Dec 27, 2007 at 04:04:00PM -0700, Kelly Jones wrote:
> > I found some public domain data I want to upload to OSM, but can't
> > seem to convert the NAD83 format it's in to latitude/longitude. I know
> > it should be easy, but even things like:
>
> It's not NAD83 that's giving you troubles, but the particular projection the
> data is in.  NAD83 is almost exactly the same as WGS84 (at least for this
> century).
>
> > http://www.ngs.noaa.gov/cgi-bin/spc_getgp.prl
> >
> > are giving me ridiculous answers.
>
> This page doesn't seem to accept both NAD83 and feet, so that's to be
> expected.
>
> > OGRFeature(schoolLocation):23
> >   SCHOOLTYPE (String) = HIGH
> >   SCHOOLNAME (String) = RIO GRANDE
> >   POINT (1507003.249 1473733.624)
> >
> > I know the correct answer for this item is approximately latitude
> > 35.052536, longitude -106.69394, but am not sure how to do this
> > translation for all items in the shapefile.
>
> How about the following?
>
> $ echo 1507003.249 1473733.624 | invproj -f %f +init=epsg:2258
> -106.695765     35.049850
>
> According to the data in OSM, it's on the other side of the road as the
> correct location.  Is that accurate enough?
>
> From what I see, you're already using OGR.  Have you tried the following?
> It
> should convert the shapefile with state plane coordinates into a shapefile
> with WGS84 coordinates.
>
> $ ogr2ogr -t_srs EPSG:4326 shapefile_wgs84.shp shapefile.shp
>
>   Gabriel.