Skip to content
Permalink
Browse files

[processing] add GDAL Contour algorithm

  • Loading branch information
alexbruy committed Sep 14, 2013
1 parent 6b5fef1 commit 65b5b01b456aacd70d8be3168aa6b3f0e1ab0b41
@@ -45,6 +45,7 @@
from processing.gdal.gdaladdo import gdaladdo
from processing.gdal.ClipByExtent import ClipByExtent
from processing.gdal.ClipByMask import ClipByMask
from processing.gdal.contour import contour

from processing.gdal.ogr2ogr import Ogr2Ogr
from processing.gdal.ogrinfo import OgrInfo
@@ -94,6 +95,7 @@ def createAlgsList(self):
self.preloadedAlgs = [nearblack(), information(), warp(), translate(),
rgb2pct(), pct2rgb(), merge(), polygonize(),
gdaladdo(), ClipByExtent(), ClipByMask(),
contour(),
OgrInfo(), Ogr2Ogr(), OgrSql()]

#And then we add those that are created as python scripts
@@ -0,0 +1,80 @@
# -*- coding: utf-8 -*-

"""
***************************************************************************
contour.py
---------------------
Date : September 2013
Copyright : (C) 2013 by Alexander Bruy
Email : alexander bruy at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""

__author__ = 'Alexander Bruy'
__date__ = 'September 2013'
__copyright__ = '(C) 2013, Alexander Bruy'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'

import os
from PyQt4 import QtGui
from qgis.core import *

from processing.core.GeoAlgorithm import GeoAlgorithm

from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterNumber import ParameterNumber
from processing.parameters.ParameterString import ParameterString

from processing.outputs.OutputVector import OutputVector

from processing.gdal.GdalUtils import GdalUtils

class contour(GeoAlgorithm):

INPUT_RASTER = "INPUT_RASTER"
OUTPUT_VECTOR = "OUTPUT_VECTOR"
INTERVAL = "INTERVAL"
FIELD_NAME = "FIELD_NAME"
EXTRA = "EXTRA"

def getIcon(self):
filepath = os.path.dirname(__file__) + "/icons/contour.png"
return QtGui.QIcon(filepath)

def defineCharacteristics(self):
self.name = "Contour"
self.group = "[GDAL] Extraction"
self.addParameter(ParameterRaster(self.INPUT_RASTER, "Input layer", False))
self.addParameter(ParameterNumber(self.INTERVAL, "Interval between contour lines", 0.0, 99999999.999999, 10.0))
self.addParameter(ParameterString(self.FIELD_NAME, "Attribute name (if not provided, no elecation attribute is attached)", "ELEV", optional=True))
self.addParameter(ParameterString(self.EXTRA, "Additional creation parameters", ""))

self.addOutput(OutputVector(self.OUTPUT_VECTOR, "Output file for contour lines (vector)"))

def processAlgorithm(self, progress):
interval = str(self.getParameterValue(self.INTERVAL))
fieldName = str(self.getParameterValue(self.FIELD_NAME))
extra = str(self.getParameterValue(self.EXTRA))

arguments = []
if len(fieldName) > 0:
arguments.append("-a")
arguments.append(fieldName)
arguments.append("-i")
arguments.append(interval)

if len(extra) > 0:
arguments.append(extra)

arguments.append(self.getParameterValue(self.INPUT_RASTER))
arguments.append(self.getOutputValue(self.OUTPUT_VECTOR))

GdalUtils.runGdal(["gdal_contour", GdalUtils.escapeAndJoin(arguments)], progress)

0 comments on commit 65b5b01

Please sign in to comment.
You can’t perform that action at this time.