ASC import and mapping data to earth

superstefansuperstefan Global Mapper UserPosts: 34Trusted User
edited April 2014 in Elevation Data
I am importing elevation data from an ASC data source with the header:
ncols 3482
nrows 2401
xllcorner -11502,5
yllcorner 330997,5
cellsize 10
NODATA_value -9999

using TM/WGS84. This works, but how can I rectify all X/Y coordinates to lat/lon?

Thank you very much in advance.

Comments

  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited April 2014
    After load, just go to the Projection tab of the Configuration dialog and change the projection to Geographic. This will reproject your data to lat/lon. You can then export a new grid in that projection using File->Export->Export Elevation Data.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Guru
    geohelp@bluemarblegeo.com
    Global Mapper
  • superstefansuperstefan Global Mapper User Posts: 34Trusted User
    edited April 2014
    Thank you Mike! After changing the projection to GEO the coordinates displayed in statusbar remain unchanged.
    Expecting something like 48.275028, 16.237251 (near Vienna).

    I believe I need to georeference the dataset first since the values in the Arc ASCII Grid (xllcorner,yllcorner) are odd IMO.
    What am I missing?
  • superstefansuperstefan Global Mapper User Posts: 34Trusted User
    edited April 2014
    Please ignore, I need to provide something like
    False_Northing: -5000000.000000
    Central_Meridian: 10.333333

    as projection parameters. Got it. :-)
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