Changes between Version 6 and Version 7 of NetCDF_ProjectionTestingStatus


Ignore:
Timestamp:
Oct 18, 2011, 7:39:36 AM (13 years ago)
Author:
etourigny
Comment:

--

Legend:

Unmodified
Added
Removed
Modified

  • NetCDF_ProjectionTestingStatus

    v6 v7  
    77The table below shows tested ability to export projections from a GDAL raster - originally in GeoTIFF - to NetCDF CF-1.5 in each supported projection.
    88
    9 Hopefully the shorthand projection names listed below are fairly self-explanatory - they've been listed in the same order as that shown on the CF-1.5 appendix page.
     9The shorthand projection names listed below correspond to their names in the source files and hopefully are fairly self-explanatory - they've been listed in the same order as that shown on the CF-1.5 appendix page.
    1010
    1111'''Note''': the current import capability has been tested to be the inverse of the export capability. If and when we are able to test capability to import NetCDF variants that don't have a direct CF-1 equivalent, we should add a supplementary table.
    1212
    13 ||'''Projection'''||'''Export- CF compliance'''||'''Export - openable by NetCDF Java'''||'''Updated'''||'''Note'''||
    14 ||AEA||Yes||Yes||18/10/11||Tested regular 2SP version - see AEA note below.||
    15 ||!AzEq||Yes||No||18/10/11||See (1) below||
    16 ||LAzEqA||Yes||Yes||18/10/11||||
    17 ||LC-2SP||Yes||Yes||18/10/11||Tested 2SP version - CF-1 claims to have a 1SP version, but params quite different to OGC WKT so not tested. See note below.||
    18 ||LCEA||Yes||No||18/10/11||Tested regular OGC WKT with 1 std parallel version (CF-1 has alternative, see notes below). See (1) below re NetCDF-Java loading.||
    19 ||M-1SP||Yes||No||18/10/11||See (1) below||
    20 ||M-2SP||Yes||Yes*||18/10/11||Parameters appear correct, loads in NetCDF Java and IDV, but appears translated slightly (a few arc-minutes) from expected position||
    21 ||Ortho||Yes||Yes||18/10/11||||
    22 ||Polar St||Yes*||No*||18/10/11||See projection comments below re parameters. File opens in IDV, but then ||
    23 ||Rot Pole||No||No||18/10/11||See projection comments below||
    24 ||St||Yes||Yes||18/10/11||||
    25 ||TM||Yes||Yes||18/10/11||||
     13||'''Projection'''||'''Name'''||'''CF Export'''||'''CF Import'''||'''NetCDF Java'''||'''Updated'''||'''Note'''||
     14||AEA||Albers Equal Area||Yes||Yes||Yes||18/10/11||Tested regular 2SP version - see AEA note below.||
     15||AE||Azimuthal equidistant||Yes||Yes||No||18/10/11||See (1) below||
     16||LAEA||Lambert azimuthal equal area||Yes||Yes||Yes||18/10/11||||
     17||LCC1SP||Lambert conformal||?||?||?||18/10/11||Tested 2SP version - CF-1 claims to have a 1SP version, but params quite different to OGC WKT so not tested. See note below.||
     18||LCC2SP||Lambert conformal||Yes||Yes||Yes||18/10/11||LCC in GDAL/OGR||
     19||CEA||Lambert Cylindrical Equal Area||Yes||Partial||No||18/10/11||Tested regular OGC WKT with std_parallel version (CF-1 has alternative scale_factor_at_projection_origin version, see notes below). See (1) below re NetCDF-Java loading.||
     20||M-1SP||Mercator||Yes||Yes||No||18/10/11||See (1) below||
     21||M-2SP||Mercator||Yes||Yes||Yes*||18/10/11||Parameters appear correct, loads in NetCDF Java and IDV, but appears translated slightly (a few arc-minutes) from expected position||
     22||Ortho||Orthographic||Yes||Yes||Yes||18/10/11||||
     23||PS||Polar stereographic||Yes*||No||No*||18/10/11||See projection comments below re parameters. File opens in IDV, but then ||
     24||Rot Pole||Rotated pole||No||No||No||18/10/11||See projection comments below||
     25||St||Stereographic||Yes||Yes||Yes||18/10/11||||
     26||TM||Transverse Mercator||Yes||Yes||Yes||18/10/11||||
    2627
    2728'''General notes''':
    … …  
    3132'''Issues with CF-1 implementation of specific projections''':
    3233
    33  * AEA (Albers Equal Area): The OGC WKT version has 2 Std parallels - whereas the CF-1.5 version says it can have either 1 or 2 std parallels. How would the 2SP version be converted to a CF 1SP version, and vice-versa?
    34  * LCC (Lambert Conformal Conic): The OGC WKT 'Lambert_Conformal_Conic_2SP' maps clearly to LC in CF-1 with 2 std parallels. The CF-1 spec claims that a 1SP version can be used, but it doesn't include a 'scale_factor' as does the OGC WKT 'Lambert_Conformal_Conic_1SP'. Is there a way to do this conversion?
    35  * LCEA (Lambert Cylindrical Equal Area): The CF-1 conventions claim this can be encoded with a 'scale_factor_at_projection_origin' alternative to standard parallel - how would this conversion be done back from OGC WKT?
    36  * Polar St (Polar Stereographic): This projection's parameters in CF-1 are quite unusual, and significantly different from http://www.remotesensing.org/geotiff/proj_list/polar_stereographic.html. In particular finding a CF-1 equivalent for 'latitude of natural origin' is proving difficult.
    37  * Rot pole (Rotated Pole): Not able yet to test: as seems GDAL needs support of advanced proj4 strings that can handle rotated coord systems.
     34 * AEA : The OGC WKT version has 2 Std parallels - whereas the CF-1.5 version says it can have either 1 or 2 std parallels. How would the 2SP version be converted to a CF 1SP version, and vice-versa?
     35 * LCC : The OGC WKT 'Lambert_Conformal_Conic_2SP' maps clearly to LC in CF-1 with 2 std parallels. The CF-1 spec claims that a 1SP version can be used, but it doesn't include a 'scale_factor' as does the OGC WKT 'Lambert_Conformal_Conic_1SP'. Is there a way to do this conversion?
     36 * CEA : The CF-1 conventions claim this can be encoded with a 'scale_factor_at_projection_origin' alternative to standard parallel - how would this conversion be done back from OGC WKT?
     37 * PS : This projection's parameters in CF-1 are quite unusual, and significantly different from http://www.remotesensing.org/geotiff/proj_list/polar_stereographic.html. In particular finding a CF-1 equivalent for 'latitude of natural origin' is proving difficult.
     38 * Rot pole : Not able yet to test: as seems GDAL needs support of advanced proj4 strings that can handle rotated coord systems.