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

Question

Louise Wilson 2021-11-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1596974-change-projection-of-netcdf-data-and-convert-from-utm-to-lat-lon

评论： Louise Wilson 2021-11-30

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?

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Answer 1

Louise Wilson 2021-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/1596974-change-projection-of-netcdf-data-and-convert-from-utm-to-lat-lon#answer_843419

I have since realised that it is not logical to modify the spatial data in this way as it would break the regularity.

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Answer 2

Rishabh Singh 2021-11-29

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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.

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Rishabh Singh 2021-11-30

Could you provide more insight on this issue of yours regarding lat/lon array of different sizes?

Louise Wilson 2021-11-30

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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