[gdal-dev] MVT fields/geometry alignment

[Michael Sumner]

Hello,

In this MVT source poLayer->GetFeatureCount() reports that there are 85
features, as does ogrinfo summary:

##  taken from https://docs.mapbox.com/vector-tiles/reference/
ogrinfo -so
http://a.tiles.mapbox.com/v4/mapbox.mapbox-streets-v7/14/4823/6160.mvt?access_token=
<your-token>

INFO: Open of `'
      using driver `MVT' successful.

Layer name: landuse
Geometry: Multi Polygon
Feature Count: 85
Extent: (-8239795.799271, 4968375.188829) - (-8238077.160463,
4970241.327215)
Layer SRS WKT:
...

But, iterating features finds 81 valid features, as reported by

ogrinfo
http://a.tiles.mapbox.com/v4/mapbox.mapbox-streets-v7/14/4823/6160.mvt?access_token=
<your-token>

without Summary Only mode.

Is this a problem for GDAL, or a general issue with various formats? I'm
after advice on whether to always iterate for a valid feature count, or
could this be fixed for MVT?

(I don't know anything about the internal details of protocol buffers.)

Thank you.

Mike

--
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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