Change projection of netcdf data and convert from UTM to lat/lon

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I have a netcdf file
vardata=ncread('TL__Map1_15C_sand1__20mres_-36.265137N_174.790466','TLdata');
ncdisp('TL__Map1_15C_sand1__20mres_-36.265137N_174.790466')
Source:
X:\Matlab Scripts\TL__Map1_15C_sand1__20mres_-36.265137N_174.790466
Format:
netcdf4
Global Attributes:
description = 'TL data set TLmaps/TL__Map1_15C_sand1__20mres_-36.265137N_174.790466'
history = 'Created Fri Nov 12 09:55:31 2021'
source = 'netCDF4 python module tutorial'
Dimensions:
ilat = 280
ilon = 489
ifreq = 91
Variables:
TLdata
Size: 91x489x280
Dimensions: ifreq,ilon,ilat
Datatype: single
Attributes:
least_significant_digit = 2
units = 'dB'
H_latdata
Size: 280x1
Dimensions: ilat
Datatype: single
Attributes:
units = 'degN or m'
H_londata
Size: 489x1
Dimensions: ilon
Datatype: single
Attributes:
units = 'degE or m'
H_freqdata
Size: 91x1
Dimensions: ifreq
Datatype: single
Attributes:
units = 'Hz'
I know that the projection is WGS 1984 Mercator 41 and the lat/lon coordinates are in UTM.
I would like to be able to convert this grid to lat/lon, can anyone help?

Accepted Answer

Louise Wilson
Louise Wilson on 30 Nov 2021
I have since realised that it is not logical to modify the spatial data in this way as it would break the regularity.

More Answers (1)

Rishabh Singh
Rishabh Singh on 29 Nov 2021
Hey Louise,
If you wish to convert the UTM to lat-lon cordinates I would suggest looking into UTM2LL.
Disclaimer: UTM2LL is a File Exchange submission. Please contact the author of UTM2LL in case of any issue.
  3 Comments
Rishabh Singh
Rishabh Singh on 30 Nov 2021
Could you provide more insight on this issue of yours regarding lat/lon array of different sizes?
Louise Wilson
Louise Wilson on 30 Nov 2021
My latitude array is 280, and the longitude array is 489. It appears you cannot convert these using utm2ll or utm2deg. I have answered this question as I understand now that it's not appropriate to convert the array in the first place.

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