Can't create a mosaic of ASCII Grid files

Description

After creating a mosaic of ASCII grid tiles I get rendering errors like this:

2017-10-06 15:17:58,128 DEBUG [org.geotools.gce.imagemosaic] - Loading level 0 with source region: java.awt.Rectangle[x=169,y=217,width=48,height=82] subsampling: 1,1 for granule:file:/data/os-data/panorama/data/nx/nx64.asc
2017-10-06 15:17:58,129 INFO [org.geotools.coverage.grid.io.imageio] - All factories fail for the operation "ImageRead"
javax.media.jai.util.ImagingException: All factories fail for the operation "ImageRead"
at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1687)

see attached file for full log.

Individual tiles load fine as ASCII grid stores

Environment

Linux

Assignee

Unassigned

Reporter

Ian Turton

Triage

None

Fix versions

None

Affects versions

Components

Priority

Medium
Configure