[gdal-dev] Bogus GeoJSON file or am I doing something wrong? (re-post)

[Simon Eves]

OK, so it's a weird file.

I'll leave it to you to decide whether it's worth making GDAL/Proj deal
with it. I suspect not, and that's fine with us.

Thanks!

Simon

On Tue, Sep 24, 2019 at 12:22 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> On mardi 24 septembre 2019 11:52:22 CEST Simon Eves wrote:
> > (re-posting as the first one ~2 weeks ago went into moderation quarantine
> > due to attachment size and I don't know if it ever came out again, but
> > certainly had no responses)
> >
> > When our system imports (using GDAL) the attached GeoJSON file (of
> unknown
> > provenance, via our QA team) the geo (California counties) ends up
> > somewhere out in the Pacific and really small and slightly rotated.
> >
> > I get the same results whether I import the file directly, or do a
> > Shapefile or WKT CSV conversion with ogr2ogr first (forcing to
> EPSG:4326).
> >
> > Is the file bogus, or is GDAL not interpreting the original coordinate
> > system correctly?
>
> Its CRS and coordinate encoding is highly unstandard
>
>
> "crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:EPSG:102243"}},"hc-
> transform":{"default":{"crs":"+proj=lcc +lat_1=37.06666666666667
> +lat_2=38.43333333333333 +lat_0=36.5 +lon
> _0=-120.5 +x_0=2000000 +y_0=500000 +ellps=GRS80 +units=m +no_defs","scale":
> 0.000665455608285,"jsonres":15.5,"jsonmarginX":-999,"jsonmarginY":
> 9851.0,"xoffset":1668099.76286,"yoffset":1116967.85109}}
>
> EPSG:102243 doesn't exist. It is actually ESRI:102243 (the proj string
> above
> is consistant with that)
>
> But the main issue is the "transform" object that seems to describe a
> offset &
> scaling strategy to encode coordinates as integer values. You'll have to
> manually apply those corrections
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>


-- 
<http://www.omnisci.com/>
Simon Eves
Senior Graphics Engineer, Rendering Group
OmniSci, 1 Front St. #2650, San Francisco, CA 94111, USA


Email: simon.eves at omnisci.com | Cell:  415.902.1996
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