> Just wondering if the real meaning of the error is just "Did
> not find projection code from the epsg/esri definition files,
> continuing by other means".
Indeed I believe not. If you look into pj_init.c from the PROJ4 source,
the core init function pj_init_ctx() contains this:
/* find projection selection */
if (!(name = pj_param(ctx, start, "sproj").s))
{ pj_ctx_set_errno( ctx, -4 ); goto bum_call; }
for (i = 0; (s = pj_list[i].id) && strcmp(name, s) ; ++i) ;
if (!s) { pj_ctx_set_errno( ctx, -5 ); goto bum_call; }
according to pj_strerrno.c, these result in
"projection not named", /* -4 */
"unknown projection id", /* -5 */
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