Validation and Correction of GPS Altitude with data out of Digital Elevation model

Hello.

I have a Project which also consist of validating and correcting GPS Altitude data.

I have a 2Hz GPS log and i want to verify the Altitude through Latitude and Longitude in a DEM.

The 10m resolution DEM is from a government webpage and is an ASCII-File (coordinate system ETRS89/WGS84).

(https://www.data.gv.at/katalog/dataset/land-stmk_digitalesgelndemodell10m/resource/ed0d0239-8c06-4e51-b1f1-59001e23dcc9

http://service.stmk.gv.at/ogd/OGD_Data_ABT17/geoinformation/ALS_DGM_10M_UTM33N.zip)

So the data is present in meter x- and y-coordinates not in degree lat and lon.

I successfully read the data using:

[A,R] = readgeoraster('ALS_DGM_10M_UTM33N.asc','OutputType','double');

That outputs R as:

R = 

  MapCellsReference with properties:

            XWorldLimits: [388131.5 589511.5]
            YWorldLimits: [5161133.5 5298053.5]
              RasterSize: [13692 20138]
    RasterInterpretation: 'cells'
        ColumnsStartFrom: 'north'
           RowsStartFrom: 'west'
      CellExtentInWorldX: 10
      CellExtentInWorldY: 10
    RasterExtentInWorldX: 201380
    RasterExtentInWorldY: 136920
        XIntrinsicLimits: [0.5 20138.5]
        YIntrinsicLimits: [0.5 13692.5]
      TransformationType: 'rectilinear'
    CoordinateSystemType: 'planar'

I found the program "deg2utm" which converts my polar coordinates in to cartesian coordinates. (which it does successfully)

e.g.

    [x_GPS,y_GPS,utmzone] = deg2utm(lat_GPS,lon_GPS)

However neither geointerp nor mapprofile works with my "R" which is "map.rasterref.MapCellsReference"

Error using geointerp
Expected R to be one of these types:

map.rasterref.GeographicCellsReference, map.rasterref.GeographicPostingsReference

Instead its type was map.rasterref.MapCellsReference.

Error in geointerp (line 22)
    validateattributes(R, ...

Error using internal.map.convertToGeoRasterRef (line 39)
Function MAPPROFILE expected input argument 2, 'R', to be a 3-element referencing vector, a 3-by-2 referencing matrix, or a (scalar) geographic raster
reference object.

Error in mapprofile (line 123)
R = internal.map.convertToGeoRasterRef( ...
 

Maybe somebody can help me resolve my issues

THANKS