Source code for rios.applier

#!/usr/bin/env python
Basic tools for setting up a function to be applied over 
a raster processing chain. The :func:`rios.applier.apply` function is the main
point of entry in this module. 

# This file is part of RIOS - Raster I/O Simplification
# Copyright (C) 2012  Sam Gillingham, Neil Flood
# 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 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <>.

import os
import sys

import numpy
from osgeo import gdal
from osgeo import ogr

from . import imagereader
from . import imagewriter
from . import imageio
from . import rioserrors
from . import vectorreader
from . import calcstats
from . import rat
from .parallel import jobmanager

# All default values, etc., copied in from their appropriate rios modules. 
# Use of DEFAULTCREATIONOPTIONS is now deprecated, in favour of dfltDriverOptions[driver]
dfltDriverOptions = imagewriter.dfltDriverOptions
"Use the spatial intersection of inputs"
UNION = imageio.UNION
"Use the spatial union of inputs"
"Use the spatial extent of the reference file"

# From the calcstats module
"Default overview levels on output images"
"Default minimum dimension of highest overview level calculated"
"Default agregation type when using formats without LAYER_TYPE"

# For supporting that automatic color table thing which Sam loves

# For deciding if we resample using a VRT or not. VRT is the default
# and should be used unless there is a real problem with gdalwarp
# (ie GDAL 2.1.x and NZTM)
NO_VRT_FOR_RESAMPLING = os.getenv('RIOS_NO_VRT_FOR_RESAMPLING', default='0') != '0'
Whether to use VRTs for resampling inputs. Set by RIOS_NO_VRT_FOR_RESAMPLING
environment variable. Default is True.

if sys.version_info[0] > 2:
    # hack for Python 3 which uses str instead of basestring
    # we just use basestring
    basestring = str

[docs]class FilenameAssociations(object): """ Class for associating external image filenames with internal names, which are then the same names used inside a function given to the :func:`rios.applier.apply` function. Each attribute created on this object should be a filename, or a list of filenames. The corresponding attribute names will appear on the 'inputs' or 'outputs' objects inside the applied function. Each such attribute will be an image data block or a list of image data blocks, accordingly. """ def __len__(self): "Number of names defined on this instance (a list counts as only one name)" return len(self.__dict__.keys())
[docs]class BlockAssociations(object): """ Generic object to store the image blocks used within the applied function. The attributes are named the same way as in the corresponding FilenameAssociations object, but are blocks of image data, instead of filenames. Where lists of filenames were used, lists of image blocks are used here. """ pass
[docs]class OtherInputs(object): """ Generic object to store any extra inputs and outputs used inside the function being applied. This class was originally named for inputs, but in fact works just as well for outputs, too. Any items stored on this will be persistent between iterations of the block loop. """ pass
[docs]class ApplierControls(object): """ Controls for the operation of rios, for use with the :func:`rios.applier.apply` function. This object starts with default values for all controls, and has methods for setting each of them to something else. Attributes are: * **windowxsize** X size of rios block (pixels) * **windowysize** Y size of rios block (pixels) * **overlap** Number of pixels in margin for block overlaps * **footprint** :data:`rios.applier.INTERSECTION` or :data:`rios.applier.UNION` or :data:`rios.applier.BOUNDS_FROM_REFERENCE` * **drivername** GDAL driver short name for output * **creationoptions** GDAL creation options for output * **thematic** True/False for thematic outputs * **layernames** List of layer names for outputs * **referenceImage** Image for reference projection and grid that inputs will be resampled to. * **referencePixgrid** pixelGrid for reference projection and grid * **loggingstream** file-like for logging of messages * **progress** progress object * **statsIgnore** global stats ignore value for output (i.e. null value) * **calcStats** True/False to signal calculate statistics and pyramids * **omitPyramids** True/False to omit pyramids when doing stats * **overviewLevels** List of level factors used when calculating output image overviews * **overviewMinDim** Minimum dimension of highest overview level * **overviewAggType** Aggregation type for calculating overviews * **tempdir** Name of directory for temp files (resampling, etc.) * **resampleMethod** String for resample method, when required (as per GDAL) * **numThreads** Number of parallel threads used for processing each image block * **jobManagerType** Which :class:`rios.parallel.jobmanager.JobManager` sub-class to use for parallel processing (by name) * **autoColorTableType** Type of color table to be automatically added to thematic output rasters * **allowOverviewsGdalwarp** Allow use of overviews in input resample (dangerous, do not use) * **approxStats** Allow approx stats (much faster) Options relating to vector input files * **burnvalue** Value to burn into raster from vector * **filtersql** SQL where clause used to filter vector features * **alltouched** Boolean. If True, all pixels touched are included in vector. * **burnattribute** Name of vector attribute used to supply burnvalue * **vectorlayer** Number (or name) of vector layer * **vectordatatype** Numpy datatype to use for raster created from vector * **vectornull** Rasterised vector is initialised to this value, before burning Default values are provided for all attributes, and can then be over-ridden with the 'set' methods given. Some 'set' methods take an optional imagename argument. If given, this should be the same internal name used for a given image as in the :class:`rios.applier.FilenameAssociations` objects. This is the internal name for that image, and the method will set the parameter in question for that specific image, which will over-ride the global value set when no imagename is given. """ def __init__(self): self.loggingstream = sys.stdout self.drivername = DEFAULTDRIVERNAME self.overlap = DEFAULTOVERLAP self.windowxsize = DEFAULTWINDOWXSIZE self.windowysize = DEFAULTWINDOWYSIZE self.footprint = DEFAULTFOOTPRINT self.referenceImage = None self.referencePixgrid = None self.progress = None self.creationoptions = None self.statsIgnore = 0 self.calcStats = True self.omitPyramids = False self.overviewLevels = DEFAULT_OVERVIEWLEVELS self.overviewMinDim = DEFAULT_MINOVERVIEWDIM self.overviewAggType = None self.thematic = False self.layernames = None self.tempdir = '.' self.resampleMethod = DEFAULT_RESAMPLEMETHOD self.numThreads = 1 self.jobManagerType = os.getenv('RIOS_DFLT_JOBMGRTYPE', default=None) self.autoColorTableType = DEFAULT_AUTOCOLORTABLETYPE self.allowOverviewsGdalwarp = False self.approxStats = False # Vector fields self.burnvalue = 1 self.vectornull = 0 self.burnattribute = None self.filtersql = None self.alltouched = False self.vectordatatype = numpy.uint8 self.vectorlayer = 0 self.layerselection = None # Options specific to a named image. This was added on later, and is # only valid for some of the attributes, so it looks a bit out-of-place. # Instead of the options being attributes of self, they are keys in a # dictionary. This dictionary is managed by the two methods # setOptionForImagename() and getOptionForImagename(). self.optionsByImage = {}
[docs] def setOptionForImagename(self, option, imagename, value): """ Set the given option specifically for the given imagename. This method is for internal use only. If you wish to set a particular attribute, use the corresponding 'set' method. """ if imagename is None: setattr(self, option, value) else: if option not in self.optionsByImage: self.optionsByImage[option] = {} self.optionsByImage[option][imagename] = value
[docs] def getOptionForImagename(self, option, imagename): """ Returns the value of a particular option for the given imagename. If only the global option has been set, then that is returned, but if a specific value has been set for the given imagename, then use that. The imagename is the same internal name as used for the image in the :class:`rios.applier.FilenameAssociations` objects. """ value = getattr(self, option) if option in self.optionsByImage: if imagename in self.optionsByImage[option]: value = self.optionsByImage[option][imagename] return value
[docs] def setLoggingStream(self, loggingstream): """ Set the rios logging stream to the given file-like object. """ self.loggingstream = loggingstream
[docs] def setOverlap(self, overlap): """ Set the overlap to the given value. Overlap is a number of pixels, and is somewhat mis-named. It refers to the amount of margin added to each block of input, so that the blocks will overlap, hence the actual amount of overlap is really more like double this value (allowing for odd and even numbers, etc). The margin can result in pixels which are outside the extent of the given input images. These pixels will be filled with the null value for that input file, or zero if no null value is set on that file. """ self.overlap = overlap
[docs] def setOutputDriverName(self, drivername, imagename=None): """ Set the output driver name to the given GDAL shortname. Note that the GDAL creation options have defaults suitable only for the default driver, so if one sets the output driver, then the creation options should be reviewed too. In more recent versions of RIOS, the addition of driver-specific default creation options ($RIOS_DFLT_CREOPT_<driver>) allows for multiple default creation options to be set up. """ self.setOptionForImagename('drivername', imagename, drivername)
[docs] def setWindowXsize(self, windowxsize): """ Set the X size of the blocks used. Images are processed in blocks (windows) of 'windowxsize' columns, and 'windowysize' rows. """ self.windowxsize = windowxsize
[docs] def setWindowYsize(self, windowysize): """ Set the Y size of the blocks used. Images are processed in blocks (windows) of 'windowxsize' columns, and 'windowysize' rows. """ self.windowysize = windowysize
[docs] def setFootprintType(self, footprint): """ Set type of footprint, one of INTERSECTION, UNION or BOUNDS_FROM_REFERENCE from this module The footprint type controls the extent of the pixel grid used for calculation within the user function, and of the output files. Using INTERSECTION will result in the maximum extent which is wholly included in all of the input images. Using UNION results in the minimum extent which wholly includes all of the input images. If BOUNDS_FROM_REFERENCE is used, then the extent will be the same as that of the reference image or pixgrid, regardless of the extents of the various other inputs. For both UNION and BOUNDS_FROM_REFERENCE, it is possible to have pixels which are within the extent, but outside one or more of the input files. The input data for such pixels are filled with the null value for that file. If no null value is set for that file, then zero is used. """ self.footprint = footprint
[docs] def setReferenceImage(self, referenceImage): """ Set the name of the image to use for the reference pixel grid and projection. If neither referenceImage nor referencePixgrid are set, then no resampling will be allowed. Only set one of referenceImage or referencePixgrid. Note that this is the external filename, not the internal name (which unfortunately is a bit inconsistent with everything else). """ self.referenceImage = referenceImage
[docs] def setReferencePixgrid(self, referencePixgrid): """ Set the reference pixel grid. If neither referenceImage nor referencePixgrid are set, then no resampling will be allowed. Only set one of referenceImage or referencePixgrid. The referencePixgrid argument is of type :class:`rios.pixelgrid.PixelGridDefn`. """ self.referencePixgrid = referencePixgrid
[docs] def setProgress(self, progress): """ Set the progress display object. Default is no progress object. """ self.progress = progress
[docs] def setCreationOptions(self, creationoptions, imagename=None): """ Set a list of GDAL creation options (should match with the driver). Each list element is a string of the form "NAME=VALUE". Defaults are suitable for the default driver, and need to be changed if that is changed. However, if an appropriate driver-specific default environment variable ($RIOS_DFLT_CREOPT_<driver>) is given, this will be used. """ self.setOptionForImagename('creationoptions', imagename, creationoptions)
[docs] def setStatsIgnore(self, statsIgnore, imagename=None): """ Set the global default value to use as the null value when calculating stats. Setting this to None means there will be no null value in the stats calculations. """ self.setOptionForImagename('statsIgnore', imagename, statsIgnore)
[docs] def setCalcStats(self, calcStats, imagename=None): """ Set True to calc stats, False otherwise. If True, then statistics and pyramid layers are calculated (if supported by the driver """ self.setOptionForImagename('calcStats', imagename, calcStats)
[docs] def setOmitPyramids(self, omitPyramids, imagename=None): """ Set True to omit pyramid layers, False otherwise. If True, then when statistics are being calculated, pyramid layers will be omitted, otherwise they will be created at the same time. Usual default is False. """ self.setOptionForImagename('omitPyramids', imagename, omitPyramids)
[docs] def setOverviewLevels(self, overviewLevels, imagename=None): """ Set the overview levels to be used on output images (i.e. pyramid layers). Levels are specified as a list of integer factors, with the same meanings as given to the gdaladdo command. """ self.setOptionForImagename('overviewLevels', imagename, overviewLevels)
[docs] def setOverviewMinDim(self, overviewMinDim, imagename=None): """ Set minimum dimension allowed for output overview. Overview levels (i.e. pyramid layers) will be calculated as per the overviewLevels list of factors, but only until the minimum dimension falls below the value of overviewMinDim """ self.setOptionForImagename('overviewMinDim', imagename, overviewMinDim)
[docs] def setOverviewAggregationType(self, overviewAggType, imagename=None): """ Set the type of aggregation used when computing overview images (i.e. pyramid layers). Normally a thematic image should be aggregated using "NEAREST", while a continuous image should be aggregated using "AVERAGE". When the setting is given as None, then a default is used. If using an output format which supports LAYER_TYPE, the default is based on this, but if not, it comes from the value of the environment variable $RIOS_DEFAULT_OVERVIEWAGGREGATIONTYPE. This method should usually be used to set when writing an output to a format which does not support LAYER_TYPE, and which is not appropriate for the setting given by the environment default. """ self.setOptionForImagename('overviewAggType', imagename, overviewAggType)
[docs] def setThematic(self, thematicFlag, imagename=None): "Set boolean value of thematic flag (may not be supported by the GDAL driver)" self.setOptionForImagename('thematic', imagename, thematicFlag)
[docs] def setLayerNames(self, layerNames, imagename=None): """ Set list of layernames to be given to the output file(s) """ self.setOptionForImagename('layernames', imagename, layerNames)
[docs] def setTempdir(self, tempdir): "Set directory to use for temporary files for resampling, etc. " self.tempdir = tempdir
[docs] def setResampleMethod(self, resampleMethod, imagename=None): """ Set resample method to be used for all resampling. Possible options are those defined by gdalwarp, i.e. 'near', 'bilinear', 'cubic', 'cubicspline', 'lanczos'. """ self.setOptionForImagename('resampleMethod', imagename, resampleMethod)
[docs] def setBurnValue(self, burnvalue, vectorname=None): """ Set the burn value to be used when rasterizing the input vector(s). If vectorname given, set only for that vector. Default is 1. """ self.setOptionForImagename('burnvalue', vectorname, burnvalue)
[docs] def setBurnAttribute(self, burnattribute, vectorname=None): """ Set the vector attribute name from which to get the burn value for each vector feature. If vectorname is given, set only for that vector input. Default is to use burnvalue instead of burnattribute. """ self.setOptionForImagename('burnattribute', vectorname, burnattribute)
[docs] def setVectorNull(self, vectornull, vectorname=None): """ Set the vector null value. This is used to initialise the rasterised vector, before burning in the burn value. This is of most importance when burning values from a vector attribute column, as this should be a distinct value from any of the values in the column. If this is not so, then polygons can end up blending with the background, resulting in incorrect answers. """ self.setOptionForImagename('vectornull', vectorname, vectornull)
[docs] def setFilterSQL(self, filtersql, vectorname=None): """ Set an SQL WHERE clause which will be used to filter vector features. If vectorname is given, then set only for that vector """ self.setOptionForImagename('filtersql', vectorname, filtersql)
[docs] def setAlltouched(self, alltouched, vectorname=None): """ Set boolean value of alltouched attribute. If alltouched is True, then pixels will count as "inside" a vector polygon if they touch the polygon, rather than only if their centre is inside. If vectornmame given, then set only for that vector. """ self.setOptionForImagename('alltouched', vectorname, alltouched)
[docs] def setVectorDatatype(self, vectordatatype, vectorname=None): """ Set numpy datatype to use for rasterized vectors If vectorname given, set only for that vector """ self.setOptionForImagename('vectordatatype', vectorname, vectordatatype)
[docs] def setVectorlayer(self, vectorlayer, vectorname=None): """ Set number/name of vector layer, for vector formats which have multiple layers. Not required for plain shapefiles. Can be either a layer number (start at zero) or a layer name. If vectorname given, set only for that vector. """ self.setOptionForImagename('vectorlayer', vectorname, vectorlayer)
[docs] def makeResampleDict(self, imageDict): """ Make a dictionary of resample methods, one for every image name in the given dictionary. This method is for internal use only. """ d = {} imagenamelist = imageDict.keys() for name in imagenamelist: method = self.getOptionForImagename('resampleMethod', name) if isinstance(imageDict[name], list): # We have a list of images for this name, so make a list of # resample methods d[name] = [method] * len(imageDict[name]) else: # We have just one image, so the corresponding entry is just one # resample method d[name] = method return d
[docs] def selectInputImageLayers(self, layerselection, imagename=None): """ Set which layers are to be read from the input image(s). Default will read all layers. If imagename is given, selection will be for that image only. The layerselection parameter should be a list of layer numbers. Layer numbers follow GDAL conventions, i.e. a layer number of 1 refers to the first layer in the file. Can be much more efficient when only using a small subset of layers from the inputs. """ self.setOptionForImagename('layerselection', imagename, layerselection)
[docs] def setNumThreads(self, numThreads): """ Set the number of 'threads' to be used when processing each block of imagery. Note that these are not threads in the technical sense, but are handled by the JobManager class, and are some form of cooperating parallel processes, depending on the type of job manager sub-class selected. See :mod:`rios.parallel.jobmanager` for full details. Note that this is only worth using on very computationally-intensive tasks. Default is 1, i.e. no parallel processing. """ self.numThreads = numThreads
[docs] def setJobManagerType(self, jobMgrType): """ Set which type of JobManager is to be used for parallel processing. See :mod:`rios.parallel.jobmanager` for details. Default is taken from $RIOS_DFLT_JOBMGRTYPE. """ self.jobManagerType = jobMgrType
[docs] def setAutoColorTableType(self, autoColorTableType, imagename=None): """ If this option is set, then thematic raster outputs will have a color table automatically generated and attached to them. The type is passed to :func:`rios.rat.genColorTable` to determine what type of automatic color table is generated. The default type will be taken from $RIOS_DFLT_AUTOCOLORTABLETYPE if it is set. If that is not set, then the default is not to automatically attached any color table to thematic output rasters. In practise, it is probably simpler to explicitly set the color table using the :func:`rios.rat.setColorTable` function, after creating the file, but this is an alternative. Note that the imagename parameter can be given, in which case the autoColorTableType will only be applied to that raster. None of this has any impact on athematic outputs. """ self.setOptionForImagename('autoColorTableType', imagename, autoColorTableType)
[docs] def setAllowOverviewsGdalwarp(self, allowOverviewsGdalwarp): """ This option is provided purely for testing purposes, and it is recommended that this never be used operationally. In GDAL >= 2.0, the default behaviour of gdalwarp was modified so that it will use overviews during a resample to a lower resolution. By default, RIOS now switches this off again (by giving gdalwarp the '-ovr NONE' switch), as this is very unreliable behaviour. Overviews can be calculated by many different methods, and the user of the file cannot tell how they were done. In order to allow users to assess the damage done by this, we provide this option to allow resampling to use overviews. This also allows compatibility with versions of RIOS which did not switch it off, before we discovered that it was happening. To allow this, set this parameter to True, otherwise it defaults to False. We strongly recommend against allowing gdalwarp to use overviews. """ self.allowOverviewsGdalwarp = allowOverviewsGdalwarp
[docs] def setApproxStats(self, approxStats): """ Set boolean value of approxStats attribute. This modifies the behaviour of calcStats by forcing it to use the pyramid layers during stats generation (much faster but only provides approximate values, not recommended for thematic rasters) """ self.approxStats = approxStats
[docs]def apply(userFunction, infiles, outfiles, otherArgs=None, controls=None): """ Apply the given 'userFunction' to the given input and output files. infiles and outfiles are :class:`rios.applier.FilenameAssociations` objects to define associations between internal variable names and external filenames, for the raster file inputs and outputs. otherArgs is an object of extra arguments to be passed to the userFunction, each with a sensible name on the object. These can be either input or output arguments, entirely at the discretion of userFunction(). otherArgs should be in instance of :class:`rios.applier.OtherInputs` The userFunction has the following call sequence:: userFunction(info, inputs, outputs) or:: userFunction(info, inputs, outputs, otherArgs) if otherArgs is not None. inputs and outputs are objects in which there are named attributes with the same names as those given in the infiles and outfiles objects. In the inputs and outputs objects, available inside userFunction, these attributes contain numpy arrays of data read from/written to the corresponding image file. If the attributes given in the infiles or outfiles objects are lists of filenames, the the corresponding attributes of the inputs and outputs objects inside the applied function will be lists of image data blocks instead of single blocks. The numpy arrays are always 3-d arrays, with shape:: (numBands, numRows, numCols) The datatype of the output image(s) is determined directly from the datatype of the numpy arrays in the outputs object. The info object contains many useful details about the processing, and will always be passed to the userFunction. It can, of course, be ignored. It is an instance of the :class:`rios.readerinfo.ReaderInfo` class. The controls argument, if given, is an instance of the :class:`rios.applier.ApplierControls` class, which allows control of various aspects of the reading and writing of images. See the class documentation for further details. There is a page dedicated to :doc:`applierexamples`. """ # Get default controls object if none given. if controls is None: controls = ApplierControls() (imagefiles, vectorfiles) = separateVectors(infiles) inputImageLayerSelection = makeInputImageLayerSelection(imagefiles, controls) reader = imagereader.ImageReader(imagefiles.__dict__, controls.footprint, controls.windowxsize, controls.windowysize, controls.overlap, loggingstream=controls.loggingstream, layerselection=inputImageLayerSelection) vecreader = None if len(vectorfiles) > 0: vectordict = makeVectorObjects(vectorfiles, controls) vecreader = vectorreader.VectorReader(vectordict, progress=controls.progress) handleInputResampling(imagefiles, controls, reader) writerdict = {} if controls.progress is not None: controls.progress.setTotalSteps(100) controls.progress.setProgress(0) lastpercent = 0 # Set up for parallel processing, if requested. jobmgr = None if controls.numThreads > 1: jobmgr = jobmanager.getJobMgrObject(controls) done = False iterator = reader.__iter__() while not done: # list of RIOSJobInfo jobInputs = [] for n in range(controls.numThreads): try: info, blockdict = iterator.__next__() except StopIteration: done = True break inputBlocks = BlockAssociations() inputBlocks.__dict__.update(blockdict) if vecreader is not None: vecblocks = vecreader.rasterize(info) inputBlocks.__dict__.update(vecblocks) # build a RIOSJobInfo with the params jobInfo = RIOSJobInfo(info, inputBlocks, otherArgs) jobInputs.append(jobInfo) if len(jobInputs) == 0: break # Now call the function with those args if jobmgr is None: # single threaded - just call it params = jobInfo.getFunctionParams() userFunction(*params) outputBlocks = jobInfo.getFunctionResult(params) writeOutputBlocks(writerdict, outfiles, outputBlocks, controls, info) else: # multi threaded - get the job manager to run jobs outBlocksList = jobmgr.runSubJobs(userFunction, jobInputs) for outputBlocks in outBlocksList: writeOutputBlocks(writerdict, outfiles, outputBlocks, controls, info) lastpercent = updateProgress(controls, info, lastpercent) if jobmgr is not None: jobmgr.finalise() if controls.progress is not None: controls.progress.setProgress(100) closeOutputImages(writerdict, outfiles, controls)
[docs]def closeOutputImages(writerdict, outfiles, controls): """ Called by :func:`rios.applier.apply` to close all output image files. """ for name in outfiles.__dict__.keys(): writer = writerdict[name] if isinstance(writer, list): writerList = writer else: writerList = [writer] for singleWriter in writerList: singleWriter.close(calcStats=controls.getOptionForImagename('calcStats', name), statsIgnore=controls.getOptionForImagename('statsIgnore', name), progress=controls.progress, omitPyramids=controls.getOptionForImagename('omitPyramids', name), overviewLevels=controls.getOptionForImagename('overviewLevels', name), overviewMinDim=controls.getOptionForImagename('overviewMinDim', name), overviewAggType=controls.getOptionForImagename('overviewAggType', name), autoColorTableType=controls.getOptionForImagename('autoColorTableType', name), approx_ok=controls.getOptionForImagename('approxStats', name))
[docs]def updateProgress(controls, info, lastpercent): """ Called by :func:`rios.applier.apply` to update progress """ if controls.progress is not None: percent = info.getPercent() if percent != lastpercent: controls.progress.setProgress(percent) lastpercent = percent return lastpercent
[docs]def handleInputResampling(infiles, controls, reader): """ Called by :func:`rios.applier.apply` to handle automatic resampling of input rasters. Most of the work is done by the read.allowResample() method. """ if controls.referenceImage is not None: resampleDict = controls.makeResampleDict(infiles.__dict__) reader.allowResample(refpath=controls.referenceImage, tempdir=controls.tempdir, resamplemethod=resampleDict, useVRT=(not NO_VRT_FOR_RESAMPLING), allowOverviewsGdalwarp=controls.allowOverviewsGdalwarp) elif controls.referencePixgrid is not None: resampleDict = controls.makeResampleDict(infiles.__dict__) reader.allowResample(refPixgrid=controls.referencePixgrid, tempdir=controls.tempdir, resamplemethod=resampleDict, useVRT=(not NO_VRT_FOR_RESAMPLING), allowOverviewsGdalwarp=controls.allowOverviewsGdalwarp)
[docs]def writeOutputBlocks(writerdict, outfiles, outputBlocks, controls, info): """ Called by :func:`rios.applier.apply`, to write the output blocks, after they have been created by the user function. For internal use only. For all names given in outfiles object, look for a data block of the same name in the outputBlocks object. If the given name is a list, then the corresponding name should be a list of blocks. """ for name in outfiles.__dict__.keys(): if name not in outputBlocks.__dict__: msg = 'Output key %s not found in output blocks' % name raise rioserrors.KeysMismatch(msg) outblock = outputBlocks.__dict__[name] outfileName = getattr(outfiles, name) if name not in writerdict: # We have not yet created the output writers if isinstance(outfileName, list): # We have a list of filenames under this name in the dictionary, # and so we must create a list of writers. The outblock will also be # a list of blocks writerdict[name] = [] numFiles = len(outfileName) if len(outblock) != numFiles: raise rioserrors.MismatchedListLengthsError(("Output '%s' writes %d files, "+ "but only %d blocks given")%(name, numFiles, len(outblock))) for i in range(numFiles): filename = outfileName[i] writer = imagewriter.ImageWriter(filename, info=info, firstblock=outblock[i], drivername=controls.getOptionForImagename('drivername', name), creationoptions=controls.getOptionForImagename('creationoptions', name)) writerdict[name].append(writer) if controls.getOptionForImagename('thematic', name): writer.setThematic() layernames = controls.getOptionForImagename('layernames', name) if layernames is not None: writer.setLayerNames(layernames) else: # This name in the dictionary is just a single filename writer = imagewriter.ImageWriter(outfileName, info=info, firstblock=outblock, drivername=controls.getOptionForImagename('drivername', name), creationoptions=controls.getOptionForImagename('creationoptions', name)) writerdict[name] = writer if controls.getOptionForImagename('thematic', name): writer.setThematic() layernames = controls.getOptionForImagename('layernames', name) if layernames is not None: writer.setLayerNames(layernames) else: # The output writers exist, so select the correct one and write the block if isinstance(outfileName, list): # We have a list of files for this name, and a list of blocks to write numFiles = len(outfileName) if len(outblock) != numFiles: raise rioserrors.MismatchedListLengthsError(("Output '%s' writes %d files, "+ "but only %d blocks given")%(name, numFiles, len(outblock))) for i in range(numFiles): writerdict[name][i].write(outblock[i]) else: # This name is just a single file, and we write a single block writerdict[name].write(outblock)
[docs]def separateVectors(infiles): """ Given a :class:`rios.applier.FilenameAssociations` object, separate out the files which are raster, and the files which are vectors. Returns two :class:`rios.applier.FilenameAssociations` objects, carrying the same attribute names, but each has only the raster or the vectors. """ imagefiles = FilenameAssociations() vectorfiles = FilenameAssociations() nameList = sorted(infiles.__dict__.keys()) for name in nameList: fileValue = getattr(infiles, name) if isinstance(fileValue, basestring): testFilename = fileValue elif isinstance(fileValue, list): # We only check the first filename in a list. If the user # mixed rasters and vectors in one list, things would go horribly wrong testFilename = fileValue[0] else: testFilename = None if opensAsRaster(testFilename): setattr(imagefiles, name, fileValue) elif opensAsVector(testFilename): setattr(vectorfiles, name, fileValue) else: raise rioserrors.FileOpenError("Failed to open file '%s' as either raster or vector"%testFilename) return (imagefiles, vectorfiles)
[docs]def opensAsRaster(filename): """ Return True if filename opens as a GDAL raster, False otherwise """ usingExceptions = gdal.GetUseExceptions() gdal.UseExceptions() try: ds = gdal.Open(filename) except Exception: ds = None finally: if not usingExceptions: gdal.DontUseExceptions() opensOK = (ds is not None) return opensOK
[docs]def opensAsVector(filename): """ Return True if filename opens as an OGR vector, False otherwise """ usingExceptions = False if hasattr(ogr, 'GetUseExceptions'): usingExceptions = ogr.GetUseExceptions() ogr.UseExceptions() try: ds = ogr.Open(filename) except Exception: ds = None opensOK = (ds is not None) if not usingExceptions: ogr.DontUseExceptions() return opensOK
[docs]def makeVectorObjects(vectorfiles, controls): """ Returns a dictionary of :class:`rios.vectorreader.Vector` objects, with the keys being the attribute names used on the vectorfiles object. This is then ready to go into the :class:`rios.vectorreader.VectorReader` constructor. """ vectordict = {} namelist = sorted(vectorfiles.__dict__.keys()) for name in namelist: burnvalue = controls.getOptionForImagename('burnvalue', name) vectordatatype = controls.getOptionForImagename('vectordatatype', name) alltouched = controls.getOptionForImagename('alltouched', name) vectorlayer = controls.getOptionForImagename('vectorlayer', name) burnattribute = controls.getOptionForImagename('burnattribute', name) filtersql = controls.getOptionForImagename('filtersql', name) tempdir = controls.tempdir vectornull = controls.getOptionForImagename('vectornull', name) fileValue = getattr(vectorfiles, name) if isinstance(fileValue, list): veclist = [] for filename in fileValue: vec = vectorreader.Vector(filename, burnvalue=burnvalue, datatype=vectordatatype, attribute=burnattribute, filter=filtersql, inputlayer=vectorlayer, alltouched=alltouched, tempdir=tempdir, nullval=vectornull) veclist.append(vec) vectordict[name] = veclist elif isinstance(fileValue, basestring): vectordict[name] = vectorreader.Vector(fileValue, burnvalue=burnvalue, datatype=vectordatatype, attribute=burnattribute, filter=filtersql, inputlayer=vectorlayer, alltouched=alltouched, tempdir=tempdir, nullval=vectornull) return vectordict
[docs]def makeInputImageLayerSelection(imagefiles, controls): """ Make a dictionary with the same image name keys as imagefiles, but with layerselection lists for each entry, as per the controls object. If only some images have a layerselection set, then the remaining entries are None. """ layerselection = {} for name in imagefiles.__dict__.keys(): layerselection[name] = controls.getOptionForImagename('layerselection', name) return layerselection
[docs]class RIOSJobInfo(jobmanager.JobInfo): """ Class that contains information for parameters to a RIOS function """ def __init__(self, info, inputs, otherargs=None): = info self.inputs = inputs self.otherargs = otherargs # we don't bother pickling the outputs - start again # with a fresh BlockAssociations
[docs] def prepareForPickling(self): """ GDAL datasets cannot be pickled and neither stderr (in info.logginstream) so we clean up the info object a bit """ = {} = None return self
[docs] def getFunctionParams(self): """ Return the parameters as a tuple. When this is run in the subprocess, we can reset the info.loggingstream to something other than None """ if is None: = imagereader.DEFAULTLOGGINGSTREAM outputs = BlockAssociations() params = (, self.inputs, outputs) if self.otherargs is not None: params += (self.otherargs,) return params
[docs] def getFunctionResult(self, params): """ Return the ouputs parameter """ return params[2]