Increase flexibility of spatial reference checks

OTB Usage
1

With some spatial reference system, the OTB application fail to run because the naming of vector and raster coordinate systems are not the same. I guess this comes from OGR/gdal differences, but I would like to know if it is possible to desactivate the check of identical srs (I know that it is a "safety " control, but in my case I know what I am doing.

I have the issue with otbcli_KMeansclassification (no input shp, but one is created during the process) and with otbcli_TrainImagesClassifier, even when I copy/paste the PROJS definition into the prj file. My workaround was to define a wrong projection for both, then come bck to the initial srs, but this is clearly dirty.

2019-01-25 16:06:03 (FATAL): itk::ERROR: PersistentImageSampleExtractorFilter(0xa10940): Spatial reference of input image and samples don't match:
PROJCS["Belge 1972 / Belgian Lambert 72",
    GEOGCS["Belge 1972",
        DATUM["Reseau_National_Belge_1972",
            SPHEROID["International 1924",6378388,297,
                AUTHORITY["EPSG","7022"]],
            TOWGS84[-106.8686,52.2978,-103.7239,0.3366,-0.457,1.8422,-1.2747],
            AUTHORITY["EPSG","6313"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4313"]],
    PROJECTION["Lambert_Conformal_Conic_2SP"],
    PARAMETER["standard_parallel_1",51.16666723333333],
    PARAMETER["standard_parallel_2",49.8333339],
    PARAMETER["latitude_of_origin",90],
    PARAMETER["central_meridian",4.367486666666666],
    PARAMETER["false_easting",150000.013],
    PARAMETER["false_northing",5400088.438],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["X",EAST],
    AXIS["Y",NORTH],
    AUTHORITY["EPSG","31370"]]
vs
PROJCS["Belge_1972_Belgian_Lambert_72",
    GEOGCS["GCS_Belge 1972",
        DATUM["Reseau_National_Belge_1972",
            SPHEROID["International_1924",6378388,297]],
        PRIMEM["Greenwich",0],
        UNIT["Degree",0.017453292519943295]],
    PROJECTION["Lambert_Conformal_Conic_2SP"],
    PARAMETER["standard_parallel_1",51.16666723333333],
    PARAMETER["standard_parallel_2",49.8333339],
    PARAMETER["latitude_of_origin",90],
    PARAMETER["central_meridian",4.367486666666666],
    PARAMETER["false_easting",150000.013],
    PARAMETER["false_northing",5400088.438],
    UNIT["Meter",1]]
2

I think merging the following merge request :

https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/merge_requests/224

Might solve your problem because SRS comparison will then rely on OSR::IsSame() method in gdal instead of comparing strings.