Classification supervisée

OTB Usage
1

Bonjour j’essaie de faire une classification svm, j’utilise le qgis 3.10 et j’ai installé otb 7.1
Je n’arrive pas à faire la classification, voici le message d’erreur. ceci est arrivé à quelqu’un?

ERROR 1: PROJ: proj_create_from_database: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_database: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_database: Cannot find proj.db
proj_create_from_database: Cannot find proj.db
ERROR 1: PROJ: pj_obj_create: Cannot find proj.db
ERROR 1: PROJ: createGeodeticReferenceFrame: Cannot find proj.db
ERROR 1: PROJ: proj_as_wkt: Cannot find proj.db
proj_create_from_database: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_wkt: Cannot find proj.db
ERROR 1: PROJ: createGeodeticReferenceFrame: Cannot find proj.db
ERROR 1: PROJ: pj_obj_create: Cannot find proj.db
ERROR 1: PROJ: proj_as_wkt: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_wkt: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_wkt: Cannot find proj.db
ERROR 1: PROJ: proj_as_wkt: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_wkt: Cannot find proj.db
ERROR 1: PROJ: proj_create_from_database: Cannot find proj.db

3

Hello,

OTB 7.1.0 is not fully compatible with QGIS 3.10, you should either use OTB 7.0 and QGIS 3.10 pr OTB 7.1 and QGIS 3.14.

Because it uses GDAL 3 and PROJ 6, the OTB requires the proj database file (proj.db), which should be given by the environment variable PROJ_LIB, this required some modification in the QGIS OTB plugin, which are only available in QGIS 3.14.

There is a table summarizing which version of OTB can be used with which version of QGIS here.

Cédric

4

J’ai installé la dernière version de qgis et je pense que ça va marcher. Sauf que ça fait plus de 4h que “imageClassifer” tourne ceci est dû à la grandeur de l’image j’imagine.