Re: [Geotools-gt2-users] Working with GDAL and File Geodatabases

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Hi Phil,
the documentation is correct in the sense that the code was manually tested
for 3.2 or older.
Setting up GDAL to work with GeoTools is sort of a dark magic art that few
master, Linux distributions stopped
providing gdal-java bindings making a manual build almost the only option.

Even for the github action testing GDAL on Linux we pull a pre-built bridge
library, a solution
that works for the time being, but won't last in the long run:
https://github.com/geotools/geotools/blob/main/.github/workflows/linux_gdal.yml#L23

The GeoServer docker image also has an example, in this case building
everything from sources:
https://github.com/geoserver/docker/pull/138

I don't have a ready to use recipe regarding Windows... wondering if the
https://gisinternals.com/ builds
have java support at all?

Regards,

Andrea Aime

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On Wed, Mar 5, 2025 at 5:00 AM Phil Scadden <P.S...@gn...> wrote:

> I am having something of nightmare setting this up. The documentation
> (33-snapshot) says GDAL 3.2  or OLDER. Puzzling? Downloading GDAL3.2 from
> gisinternals archive, I find gdalinfo –formats complaining about entrypoint
> for sqlite3 in the gdal302.dll after I set up all the path and environment
> variables  (and     OGRDataStoreFactory factory = new
> JniOGRDataStoreFactory(); dies with “java.lang.UnsatisfiedLinkError:
> C:\GDAL\gdal\java\gdalalljni.dll: The specified procedure could not be
> found” ). Is the documentation correct here?
>
>
>
> *From:* Ian Turton <ijt...@gm...>
> *Sent:* Thursday, 16 May 2024 9:02 PM
> *To:* Phil Scadden <P.S...@gn...>
> *Cc:* geo...@li...
> *Subject:* Re: [Geotools-gt2-users] getting from geometry in
> SimpleFeature to ESRI geometry
>
>
>
>
>
> *CAUTION:* This email originated from outside of the organization. Do not
> click links or open attachments unless you recognize the sender and know
> the content is safe:
>
> That's probably my fault :-) GeoJSON parsing has moved to gt-geojson-core
> which along with the gt-geojson-store replaces the functionality in
> gt-geojson. The plan is at some point in the future to remove gt-geoson but
> currently GeoServer makes use of it (at least I think that was the problem)
> and I ran out of time and energy,
>
>
>
> With gt-geoson-core you should be able to do something like this:
>
>
>
> GeometryFactory gf = new GeometryFactory();
> SimpleFeatureType type = DataUtilities.*createType*("test", "the_geom:Point:srid=4326");
> SimpleFeatureBuilder builder = new SimpleFeatureBuilder(type);
> builder.add(gf.createPoint(new Coordinate(1.23456789, 0.123456789)));
> SimpleFeature feature = builder.buildFeature(null);
> ByteArrayOutputStream out = new ByteArrayOutputStream();
> GeoJSONWriter writer = new GeoJSONWriter(out);
> writer.setMaxDecimals(6);
>
> writer.write(feature);
>
> Ian
>
>
>
>
>
> On Thu, 16 May 2024 at 05:56, Phil Scadden <P.S...@gn...> wrote:
>
> Ultimately, what I am trying to do is read some features from a geopkg
> using geotools, fidding with contents of the feature and then writing the
> Feature to an ESRI FeatureServer using the REST API. Along the way, I have
> to get the geotools geometry converted to an ESRI Geometry class.
>
>  The ESRI OGCGeometry (https://esri.github.io/geometry-api-java
> <https://esri.github.io/geometry-api-java%20can> can convert to ESRI
> geometry, but the fromGeoJson seems to be only method for creating a
> OGCGeometry.
>
>
>
> What I am struggling with is getting a GeoJSON string out of geotools. I
> added gt-geojson module but can only see method for writing to file. Am I
> missing something blindingly obvious here? The documentation doesn’t seem
> up to date – pointing to methods that (eg GeoJSONWriter) that don’t exist
> (and pages 404 in the Javadoc).
>
>
>
> Using 31.0
>
>
>
> Also looking at option of using a WKT route instead.
>
>
>
>
>
> ________________________________________________
>
> Ngā mihi, Nā Phil Scadden (he/him)
>
> Te Raraunga me te Tātaritanga Mokowā Aronuku (Geospatial Data and
> Analysis)
>
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>
> --
>
> Ian Turton
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Re: [Geotools-gt2-users] Working with GDAL and File Geodatabases

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Re: [Geotools-gt2-users] Working with GDAL and File Geodatabases