GeoServer Image Mosaic time dimension is disabled

Question

I am trying to create NDVI map for 100 tiles. For each tile I have more than 10 TIFF files belonging to different dates. To do that, It appears that the Image Mosaic module can be useful with the time series.

Before I start, I tried to repeat the example in the GeoServer documentation:

https://docs.geoserver.org/latest/en/user/tutorials/imagemosaic_timeseries/imagemosaic_timeseries.html

Followed each step but without database. I created timeregex.properties file, a store and point that folder which includes snow TIFFs, afterwards I created a layer and go to the dimensions tab to enable time dimension.

It looks like it is disabled with a warning: Cannot enable, no attribute of type Date found

Does anyone know how I can proceed?

GeoServer version: 2.19.2

My timeregex.properties file:

regex=[0-9]{8}

My Folder:

sample_image.dat
snowExample.dbf
snowExample.fix
snowExample.prj
snowExample.properties
snowExample.qix
snowExample.shp
snowExample.shx
snow_20091001.tif
snow_20091101.tif
snow_20091201.tif
snow_style.sld
timeregex.properties

Answer 1

I believe you are missing the indexer.properties file. It should contain something like:

TimeAttribute=ingestion
Schema=*the_geom:Polygon,location:String,ingestion:java.util.Date
PropertyCollectors=TimestampFileNameExtractorSPI[timeregex](ingestion)

The tutorial (https://docs.geoserver.org/latest/en/user/tutorials/imagemosaic_timeseries/imagemosaic_timeseries.html) isn't clear in this, but the file is needed even if you aren't storing the data in a database.