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# README.au_ga
The files in this section result from the conversion of datasets originating
from [Geoscience Australia](http://www.ga.gov.au)
### Australia: AUSGeoid98: GDA94 -> AHD height
*Source*: [Geoscience Australia](http://www.ga.gov.au/ausgeoid/comp.html)
*Format*: GeoTIFF converted from GTX
*License*: [Creative Commons Attribution 4.0]
*Converter*: gdal_translate -of GTX AUSGeoid98.gsb AUSGeoid98.gtx -b 1
* AUSGeoid98.tif
### Australia: AUSGeoid09: GDA94 -> AHD height
*Source*: [Geoscience Australia](http://www.ga.gov.au/ausgeoid/comp.html)
*Format*: GeoTIFF converted from GTX
*License*: [Creative Commons Attribution 4.0]
*Converter*: gdal_translate -of GTX AUSGeoid09_V1.01.gsb AUSGeoid09_V1.01.gtx -b 1
Uses AusGeoid09 model which uses bi-cubic interpolation; bi-linear interpolation
of the grid file will give results agreeing to within 1cm 99.97% of the time.
* AUSGeoid09_V1.01.tif
### Australia: AUSGeoid2020: GDA2020 -> AHD height
*Source*: [Geoscience Australia](http://www.ga.gov.au/ausgeoid/comp.html)
*Format*: GeoTIFF converted from GTX
*License*: [Creative Commons Attribution 4.0]
*Converter*: gdal_translate AUSGeoid2020_20180201.gsb tmp.tif -a_nodata -999 -b 1 && gdalwarp tmp.tif AUSGeoid2020_20180201.gtx -dstnodata -88.8888015747070312 -of GTX
Uses AusGeoid2020 model.
* AUSGeoid2020_20180201.tif
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