Je veux écrire quelques scripts autonomes qui utilisent la boîte à outils de traitement de Qgis.
J'ai lu quelques discussions ( ici et ici , par exemple) mais je n'ai pas encore trouvé de solution de travail.
Utilisation de Qgis 2.16.1 sur Ubuntu Xenial 16.04 LTS
La section d'importation de mon script ressemble à ceci:
# Python modules
import sys
import time
import os
# Qgis modules
from qgis.core import *
import qgis.utils
from PyQt4.QtCore import QFileInfo, QSettings
Est-ce que quelqu'un sait ce qui me manque pour pouvoir importer le module de traitement?
Avec un traitement d'importation simple , j'obtiens ceci:
Original exception was:
Traceback (most recent call last):
File "/home/steph/Documents/Projets/20141227-CIM_Bishkek/Scripts/python/00-projets/20160811-AnalysesUAVs/20160811-UAVAnalyse.py", line 36, in <module>
import processing
File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named processing
EDIT (après le commentaire de Joseph)
J'ai essayé comme ça:
# Python modules
import sys
import time
import os
# Qgis modules
from qgis.core import *
import qgis.utils
from PyQt4.QtGui import *
app = QApplication([])
QgsApplication.setPrefixPath("/usr", True)
QgsApplication.initQgis()
from PyQt4.QtCore import QFileInfo, QSettings
#from PyQt4.QtGui import *
# Prepare processing framework
sys.path.append('/home/steph/.qgis2/python/plugins')
from processing.core.Processing import Processing
Processing.initialize()
from processing.tools import *
mais le comportement est bizarre: mon script s'exécute jusqu'à la fin sans erreur mais semble "sauter" sur les tâches qu'il est censé effectuer :-) En d'autres termes, il s'exécute jusqu'à la fin mais sans rien faire.
J'avoue que mon explication n'est pas très claire ... Je vais enquêter plus avant mais si quelqu'un a une solution magique (pas une solution) pour importer ce module, alors s'il vous plaît!
EDIT 2: ajout de tout mon script. Désolé si c'est un peu long ...
# -*- coding: cp1252 -*-
########################################################
## Name: Performs various analyses on UAV imagery using Qgis
## Source Name: UAVanalyse.py
## Version: Python 2.7
## Author: Stephane Henriod
## Usage: Performs a set of analyses on UAV imagery
## Date 11.08.2016
## Modified:
########################################################
# Import required modules
# Python modules
import sys
import time
import os
# Qgis modules
from qgis.core import *
import qgis.utils
from PyQt4.QtCore import QFileInfo, QSettings
# Custom modules
from config_work import *
import display_msg as disp
import clean_time as cl
def make_raster_layer(raster, log_file):
"""Creates a raster layer from the path to a raster, if the path exists and if the raster is valid
Param_in:
raster (string) -- The path to the raster to be transformed into a layer
log_file (string) -- The path to the log file to write in
Param_out:
list:
[0] = full path to the raster
[1] = raster layer
"""
if os.path.exists(raster):
fileName = raster
fileInfo = QFileInfo(fileName)
baseName = fileInfo.baseName()
rlayer = QgsRasterLayer(fileName, baseName)
if rlayer.isValid():
return [raster, rlayer]
else:
return False
def study_raster(rlayer, log_file):
"""Returns properties of a raster, if this one exists and is valid
Param_in:
rlayer (bin) -- A raster layer
log_file (string) -- The path to the log file to write in
"""
infos = {}
if rlayer:
infos['a - Width'] = rlayer.width()
infos['b - Height'] = rlayer.height()
infos['c - Extent'] = rlayer.extent().toString()
infos['d - # bands'] = rlayer.bandCount()
infos['e - X resolution'] = rlayer.rasterUnitsPerPixelX()
infos['f - Y resolution'] = rlayer.rasterUnitsPerPixelY()
return infos
else:
return False
def project_raster(raster, to_crs, log_file):
"""Projects a raster into another crs
Param_in:
raster (string) -- The path to the raster to be transformed into a layer
to_crs (string) -- The coordinate reference system to which the layer must be projected
log_file (string) -- The path to the log file to write in
"""
img_out_name = os.path.splitext(os.path.basename(raster))[0] + '_proj' + os.path.splitext(os.path.basename(raster))[1]
img_out = os.path.join(output_folder, img_out_name)
#processing.runalg("gdalwarp -overwrite -s_srs EPSG:32642 -t_srs " + to_crs + " " + rlayer[0] + " " + img_out)
msg = img_out
disp.display_msg(log_file, msg, 'a')
return img_out_name
if __name__ == "__main__":
t_start_script = time.localtime()
t_start_script_clean = time.strftime("%Y%m%d-%H%M", t_start_script)
# Checking the folders
if not os.path.exists(input_folder_path):
os.makedirs(input_folder_path)
if not os.path.exists(temp_folder_path):
os.makedirs(temp_folder_path)
if not os.path.exists(output_folder_path):
os.makedirs(output_folder_path)
# Creating the output and temp folders
output_folder = os.path.join(output_folder_path, t_start_script_clean + '-UAVanalyse')
temp_folder = os.path.join(temp_folder_path, t_start_script_clean + '-UAVanalyse')
if not os.path.exists(output_folder):
os.makedirs(output_folder)
if not os.path.exists(temp_folder):
os.makedirs(temp_folder)
# Creating the log file
log_file_name = t_start_script_clean + '-UAVanalyse.log'
log_file = os.path.join(output_folder, log_file_name)
# Heading of the log file
msg = "Performs a set of analyses on UAV imagery" + os.linesep
msg += "Input folder: " + input_folder_path
msg += "\n RGB image: " + img_rgb_name
msg += "\n NIR image: " + img_nir_name
msg += "\n RGBIR image: " + img_rgbir_name
msg += "\n DSM file: " + img_dsm_name
disp.display_msg(log_file, msg, 'w')
#msg = "Script started on " + cl.clean_time(t_start_script)
#disp.display_msg(log_file, msg, 'a')
# Initialize Qgis (source: http://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/intro.html)
msg = 'Initialize Qgis'
disp.display_msg(log_file, msg, 'a')
# supply path to qgis install location
QgsApplication.setPrefixPath("/usr", True)
# create a reference to the QgsApplication, setting the
# second argument to False disables the GUI
qgs = QgsApplication([], False)
# load providers
qgs.initQgis()
# Write your code here to load some layers, use processing algorithms, etc.
# Make raster layers
rlayer_rgb = make_raster_layer(img_rgb, log_file)
rlayer_nir = make_raster_layer(img_nir, log_file)
rlayer_rgbir = make_raster_layer(img_rgbir, log_file)
rlayer_dsm = make_raster_layer(img_dsm, log_file)
all_valid_layers = []
if rlayer_rgb: all_valid_layers.append(rlayer_rgb)
if rlayer_nir: all_valid_layers.append(rlayer_nir)
if rlayer_rgbir: all_valid_layers.append(rlayer_rgbir)
if rlayer_dsm: all_valid_layers.append(rlayer_dsm)
# (I) Infos about the layers
msg = os.linesep + frm_separator + os.linesep + '(I) Infos about the layers' + os.linesep + frm_separator + os.linesep
disp.display_msg(log_file, msg, 'a')
i = 1
for layer in all_valid_layers:
infos = study_raster(layer[1], log_file)
msg = '\n (' + str(i) + ') ' + layer[0] + os.linesep
for item in sorted(infos):
msg += '\n ' + str(item) + ': ' + str(infos[item]) + os.linesep
i+=1
disp.display_msg(log_file, msg, 'a')
msg = 'List of valid layers:' + os.linesep
for layer in all_valid_layers:
msg += layer[0]+ os.linesep
disp.display_msg(log_file, msg, 'a')
# (II) Projects the layers into the national coordinate system or any desired system
msg = os.linesep + frm_separator + os.linesep + '(II) Projecting of the layers' + os.linesep + frm_separator + os.linesep
disp.display_msg(log_file, msg, 'a')
i = 1
for layer in all_valid_layers:
project_raster(layer[0], to_crs, log_file)
# When script is complete, call exitQgis() to remove the provider and
# layer registries from memory
qgs.exitQgis()
msg = 'Qgis has been closed'
disp.display_msg(log_file, msg, 'a')
#raw_input("Press Enter to continue...")
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Réponses:
Linux QGIS 2.18.1
Avec ce code, exécutez Traitement à partir d'un script autonome:
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J'ai donc réussi à le faire fonctionner, merci @Joseph pour vos conseils:
Et je peux le tester avec
Mon problème, je suppose, vient du fait que j'ai importé les modules au début de mon script puis essayé de créer les objets Qgi à partir d'une fonction. Je suppose que ce serait également possible, mais il y a probablement une faille dans mes compétences en Python.
Maintenant, je vais essayer d'utiliser le module de traitement :-)
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