Scaling NOAA CDR AVHRR NDVI imagery with image.reduceRegion()?

Question

var reduce = img.reduceRegion(ee.Reducer.mean(), geom);

Using this code above on AVHRR NDVI imagery (with a resolution of 0.05 arc degrees), what scale should I set reduceRegion to? Scale accepts input of meters, but the resolution of this dataset is in arc degrees. Link to AVHRR NDVI metadata below:

https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_AVHRR_NDVI_V4

Answer 1

The reduction will by default use the scale of the viewer. However, you can check the scale of the imagery with the following code, and add it to the scale parameter of reduceRegion

print (img.projection().nominalScale())