Martin Andersson created SEDONA-269:
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Summary: Add data source for writing binary files
Key: SEDONA-269
URL: https://issues.apache.org/jira/browse/SEDONA-269
Project: Apache Sedona
Issue Type: Improvement
Reporter: Martin Andersson
The main use case in Sedona would be to write raster files in other formats
than Geotiff.
The binary file data source in Spark makes it easy to support reading different
raster formats in Sedona. We only need to implement a function to convert the
binary content to a raster.
Spark doesn't offer a binary data source that supports writing. That could be
implemented in Sedona.
The benefits to Sedona would be:
* Sedona would be able to support writing different raster formats by
implementing different RS_As[ImageFormat] functions instead of creating a
custom data source for each format. Like
[https://postgis.net/docs/RT_reference.html#Raster_Outputs]
* Users would be able to transport rasters in common formats to other data
stores like RDBMS.
Example:
{code}
// Writing rasters to file using the proposed data source:
df.selectExpr("filename", "RS_AsPNG(raster)").write.format("binary").path(....)
// Transfering rasters to Postgis:
df.selectExpr("filename", "RS_AsWKB(raster)").write.format("jdbc").option(...)
{code}
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