Martin Andersson created SEDONA-268:
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Summary: Add support for raster types in Geotiff writer
Key: SEDONA-268
URL: https://issues.apache.org/jira/browse/SEDONA-268
Project: Apache Sedona
Issue Type: Improvement
Reporter: Martin Andersson
As discussed in:
[https://lists.apache.org/thread/kbwqnj7kn9omtpsoyzbn0zsslvd8cm5t]
With the introduction of raster types in SEDONA-251, it is now possible to
enhance the existing Geotiff writer to directly support writing Geotiffs from
rasters.
Currently, the Geotiff writer requires six columns to create Geotiff files:
origin, geometry, width, height, nBands, and data. However, for rasters, only
two columns would be necessary: origin and raster.
To achieve this, we propose modifying the Geotiff writer to first attempt to
use the existing six-column format. If the input DataFrame does not meet the
necessary criteria, the writer should instead look for the origin column and a
column with the raster UDT.
For the origin column we could use the existing configuration parameter
(fieldOrigin). The raster column could be detected by type. If there are
several columns of type raster, the writer would throw an exception. For
DataFrames with several raster columns users would need to select one at a
time. Example:
{code:java}
df_many_rasters = ...
df_many_rasters.select("origin","raster1").write...
df_many_rasters.select("origin","raster2").write...
{code}
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