HYGEOS support forum

Greetings - Im new to polymer and am trying to process some Sentinel 2 SAFE files through the application. The SAFE files have a projection prior to processing of WGS 84 / UTM ZONE 18 (EPSG 32618). The polymer output appears to be in width, height. Should I assume those are in Meters? Im seeing lat/lon variables as well. Does this output look correct from ncdump?

Portion of ncdump output file
netcdf test {
dimensions:
width = 10980 ;
height = 10980 ;
variables:
double latitude(height, width) ;
latitude:_FillValue = 9.96920996838687e+36 ;
double longitude(height, width) ;
longitude:_FillValue = 9.96920996838687e+36 ;
short bitmask(height, width) ;
bitmask:_FillValue = -32767s ;
bitmask:description = "LAND:1, CLOUD_BASE:2, L1_INVALID:4, NEGATIVE_BB:8, OUT_OF_BOUNDS:16, EXCEPTION:32, THICK_AEROSOL:64, HIGH_AIR_MASS:128, EXTERNAL_MASK:512, CASE2:1024, INCONSISTENCY:2048, ANOMALY_RWMOD_BLUE:4096" ;
bitmask:bitmask_reject = "bitmask & 1023 != 0" ;
float Rnir(height, width) ;
Rnir:_FillValue = 9.96921e+36f ;

Thanks
Steve

As far as I know, the output has the same reference grid as the input (possibly resampled). The lat/lon bands are filled in by Polymer and are based on retrieving the UTM grid coordinates from the scene metadata and transforming those into longitudes and latitudes.

This is correct. The level2 output is provided in the same gris as the level1. For Sentinel-2, there is an option for using the level1 at either 10, 20 or 60 m of spatial resolution, other than this over or undersampling, there is no reprojection in Polymer.