Daniele Romagnoli ( 
https://osgeo-org.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ad08f42de-4f3f-4079-901f-23e52041d6f9
 ) *created* an issue

GeoServer ( 
https://osgeo-org.atlassian.net/browse/GEOS?atlOrigin=eyJpIjoiMDc4NGZjYzMzMGE4NGI3ZGJkNGQwN2E5Zjk0YmE2M2MiLCJwIjoiaiJ9
 ) / Improvement ( 
https://osgeo-org.atlassian.net/browse/GEOS-9512?atlOrigin=eyJpIjoiMDc4NGZjYzMzMGE4NGI3ZGJkNGQwN2E5Zjk0YmE2M2MiLCJwIjoiaiJ9
 ) GEOS-9512 ( 
https://osgeo-org.atlassian.net/browse/GEOS-9512?atlOrigin=eyJpIjoiMDc4NGZjYzMzMGE4NGI3ZGJkNGQwN2E5Zjk0YmE2M2MiLCJwIjoiaiJ9
 ) RasterDownload on Heterogeneous CRS Mosaic: avoid reprojection of granules 
having same CRS as the target CRS. ( 
https://osgeo-org.atlassian.net/browse/GEOS-9512?atlOrigin=eyJpIjoiMDc4NGZjYzMzMGE4NGI3ZGJkNGQwN2E5Zjk0YmE2M2MiLCJwIjoiaiJ9
 )

Issue Type: Improvement Assignee: Daniele Romagnoli ( 
https://osgeo-org.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ad08f42de-4f3f-4079-901f-23e52041d6f9
 ) Components: Community modules, WPS Created: 21/Feb/20 5:48 PM Priority: 
Medium Reporter: Daniele Romagnoli ( 
https://osgeo-org.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ad08f42de-4f3f-4079-901f-23e52041d6f9
 )

ImageMosaic can support mosaics of data with different CRSs. (Think about a 
collection of sentinel data with different UTM zones).
In ImageMosaic, a single common CRS is exposed as the native CRS of the whole 
collection (as an instance WGS84).

When dealing with an HeterogeneousCRS mosaic, all the read requests get 
internally reprojected to the common CRS.
So, a raster download with targetCRS = UTM 32N of a UTM 32N granule results 
into:

* a read of that granule
* an internal reprojection made by imageMosaic to common CRS (i.e. WGS84)
* an additional reprojection of the reprojected coverage, back to Target CRS = 
UTM 32N

It would be great to recognize this situation and avoid the double reprojection

( 
https://osgeo-org.atlassian.net/browse/GEOS-9512#add-comment?atlOrigin=eyJpIjoiMDc4NGZjYzMzMGE4NGI3ZGJkNGQwN2E5Zjk0YmE2M2MiLCJwIjoiaiJ9
 ) Add Comment ( 
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 )

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