GDAL OSM DRIVER

The doc of the Open method however states: Some vector formats mix features that belong to different layers in an interleaved way, which make the current feature iteration per layer rather inefficient this requires for each layer to read the whole file. We have encountered such issues with a few in-tree drivers, and fixed them. Open function and find out in which situation it returns None. The implementation will be done by Even Rouault, and is mostly triggered by the needs of the new GMLAS driver initial development funded by the European Earth observation programme Copernicus.

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Starting with GDAL 2. For example in the case of the OSM driver, as an optimization you can ask the driver to return features of a subset of layers. We have encountered such issues with a few in-tree drivers, and fixed them.

OGR – OpenStreetMap Wiki

But knowing the position of the file pointer regarding the total size of the size is easy. Rationale Some vector formats mix features that osmm to different layers in an interleaved way, which make the current feature iteration per layer rather inefficient this requires for each layer to read the whole file.

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However, it all happened suddenly that the same method won’t work any more to the same. GetNextFeatureas the later might have a slow, incomplete or stub implementation. The ResetReading method can be used to start at the beginning again. Your kind help would be greatly appreciated.

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Does anyone know what’s happening here? This method takes into account spatial and attribute filters set on layers that will be iterated upon. The progress percentage output is redundant with the progress callback mechanism, and the latter could be used to get the former, however it may be a bit convoluted.

If it grows above, it will be written in a temporary file on disk. So when reading sequences of this pattern, the driver will emit features in the order B,A,B,A, Regarding the choice of the range [0,1]this psm to be consistent with the range accepted by GDAL progress functions.

And i run it wiwth command line. A similar need arises with the development of a new driver, GMLAS for GML Application Schemasthat reads Gal files with arbitrary element nesting, and thus can return them in a apparent random order, because it works in a streaming way.

Either you do not have the file “osmconf. I’m facing the same problem, after trying to use gdal from a python wrapper: How did you set the environment variables?

[gdal-dev] How does GDAL OSM driver deal with closed ways?

Depending on the driver, this method may return features from layers in a non sequential way. Interleaved reading Gdao to the nature of OSM files and how the driver works internally, the default reading mode that works ksm might not work correctly, because too many features will accumulate in the layers before being consumed by the user application.

Email Required, but never shown. For this driver, a hack had been developped in the past to be able gral use gxal OGRLayer:: For whole planet file, the effect of this option will be less efficient. Internal working and performance tweaking The driver will use an internal SQLite database to resolve geometries.

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This RFC introduces a new API to be able to iterate over vector features at dataset level, in addition to the existing capability of doing it at the layer level. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

[gdal-dev] How does GDAL OSM driver deal with closed ways?

With the method presented in this threadI could successfully parse open the file a week ago through the following code: By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Email Required, but gdql shown. This could be interesting to address schema-less datasources where basically each feature could have a different schema GeoJSON for example without really belonging to a clearly identified layer.

I took a look at the source, but it’s beyond my knowledge. Hence the decision to make GetNextFeature?

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