payload: {"push_id":4455578658,"size":2,"distinct_size":2,"ref":"refs/heads/master","head":"fa15c9a53bf51217fcdffa9b441b38e59c2af1cb","before":"078f846729d4187661b184bbe5df52673f736390","commits":[{"sha":"c9cec218b8a32d9815572152e96f12459cdbeef0","author":{"name":"Even Rouault","email":"d8205f621e59e021912ca64710aac70d69f0e24a@spatialys.com"},"message":"north-america: fix American Samoan AS62->NAD83(HARN) grids\n\nThose grids were located in the northern hemisphere, whereas American Samoa\nis in the southern hemisphere. This issue is acknowledged in the NADCON5 manual\nhttps://www.ngs.noaa.gov/PUBS_LIB/NOAA_TR_NOS_NGS_63.pdf#page=36\n\"\"\"The grids in American Samoa are in the Southern hemisphere, and this caused\nthem to be inadvertently stored in mirror image (south is north, north is south).\"\n\nSo :\n- fix the registration of the grid to switch the sign of latitude\n- mirror vertically\n- and also negate the sign of the latitude correction\n\nThe result is consistent with what is obtained with the AS62->WGS84 Helmert\ntransformation and the https://www.ngs.noaa.gov/NCAT/ online service\n\nFor example given lat=-14.3178643343 lon=-170.8335399628 in AS62\n\n- https://www.ngs.noaa.gov/NCAT/ : AS62->NAD83(1993) outputs\n  lat -14.3129107343 lon=-170.8347552800\n\n- with the corrected grid:\n  $ echo \"-14.3178643343 -170.8335399628 0\" | cct -d 8 \\\n    +proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad \\\n    +step +proj=hgridshift +grids=$HOME/proj/proj-datumgrid/north-america/wshpgn.gsb \\\n    +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1\n -14.31290935  -170.83475638    0.00000000           inf\n\n- with the AS62->WGS84 Helmert transformation:\n  $ echo \"-14.3178643343 -170.8335399628 0\" | cct -d 8 \\\n    +proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad \\\n    +step +proj=push +v_3 +step +proj=cart +ellps=clrk66 \\\n    +step +proj=helmert +x=-115 +y=118 +z=426 \\\n    +step +inv +proj=cart +ellps=WGS84 +step +proj=pop +v_3 \\\n    +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1\n -14.31289451  -170.83478954    0.00000000           inf","distinct":true,"url":"https://api.github.com/repos/OSGeo/proj-datumgrid/commits/c9cec218b8a32d9815572152e96f12459cdbeef0"},{"sha":"fa15c9a53bf51217fcdffa9b441b38e59c2af1cb","author":{"name":"Even Rouault","email":"d8205f621e59e021912ca64710aac70d69f0e24a@spatialys.com"},"message":"Merge pull request #100 from rouault/fix_american_samoan_harn\n\nnorth-america: fix American Samoan AS62->NAD83(HARN) grids","distinct":true,"url":"https://api.github.com/repos/OSGeo/proj-datumgrid/commits/fa15c9a53bf51217fcdffa9b441b38e59c2af1cb"}]}
other: {"actor":{"display_login":"rouault"}}