PyGeoprocessing: Geoprocessing routines for GIS
PyGeoprocessing is a Python/Cython based library that provides a set of commonly used raster, vector, and hydrological operations for GIS processing. Similar functionality can be found in ArcGIS/QGIS raster algebra, ArcGIS zonal statistics, and ArcGIS/GRASS/TauDEM hydrological routing routines.
PyGeoprocessing is developed at the Natural Capital Project to create a programmable, open source, and free Python based GIS processing library to support the InVEST toolset. PyGeoprocessing’s design prioritizes computation and memory efficient runtimes, easy installation and cross compatibility with other open source and proprietary software licenses, and a simplified set of orthogonal GIS processing routines that interact with GIS data via filename. Specifically the functionally provided by PyGeoprocessing includes
- a suite of raster manipulation functions (warp, align, raster calculator, reclassification, distance transform, convolution, and fast iteration)
- a suite of vector based manipulation function (zonal statistics, rasterization, interpolate points, reprojection, and disjoint polygon sets)
- a simplified hydrological routing library (D8inf/MFD flow direction, plateau drainage, weighted and unweighted flow accumulation, and weighted and unweighted flow distance)
$ pip install pygeoprocessing
import pygeoprocessing and see a
ValueError: numpy.dtype has the
wrong size, try recompiling, this is the result of a version compatibility
issue with the numpy ABI in the precompiled pygeoprocessing binaries.
The solution is to recompile pygeoprocessing on your computer:
$ pip uninstall -y pygeoprocessing $ pip install pygeoprocessing --no-deps --no-binary :all:
Note the pip-installable requirements in
requirements.txt are for best results, but older package versions may also work. If necessary, PyGeoprocessing can be installed without dependencies with
pip install --no-deps.
- Added error checking in raster_calculator to help ensure that the target_datatype value is a valid GDAL type.
- Fixed an issue in distance_transform_edt that would occasionally cause incorrect distance calculations when the x sampling distance was > 1.
- Changed iterblocks API to take a raster/path band as an input rather than a path and a list of bands. Also removed the astype_list due to its lack of orthogonality.
- Fixed bugs in convolve_2d involving inputs with nodata masking.
- Changing default raster creation compression algorithm from LZW to DEFLATE, this is to address issues where we were seeing recreatable, but unexplainable LZWDecode errors in large raster data.
- Fixed an issue that could cause the distance transform to be incorrect when the sampling distance was in the noninclusive range of (0.0, 1.0).
- Specific type checking for astype_list in iterblocks to avoid confusing exceptions.
- Renamed test suite to be consistent with the pattern test_[component].tif.
- Added a function pygeoprocessing.routing.extract_streams_mfd that creates a contiguous stream layer raster to accounts for the divergent flow that can occur with multiple flow direction. If the flow direction raster is otherwise directly thresholded, small disjoint streams can appear where the downstream flow drops below the threshold level.
- Fixed an issue that could cause some custom arguments to geotiff creation options to be ignored.
- Added a mask_raster function that can be used to mask out pixels in an existing raster that don’t overlap with a given vector.
- Fixed a bug in the distance_transform_edt function that would cause incorrect distances to be calculated in the case of nodata pixels in the region raster. The algorithm has been modified to treat nodata as though pixel values were 0 (non-region) and the distance transform will be defined for the entire raster.
- Added a sampling_distance parameter to distance_transform_edt that linearly scales the distance transform by this value.
- Fixed an issue in calculate_slope that would raise an exception if the input dem did not have a nodata value defined.
- Changed the behavior of zonal_statistics for polygons that that do not intersect any pixels. These FIDs are now also included in the result from zonal_statistics where previously they were absent. This is to remain consistent with how other GIS libraries calculate zonal stats.
- Hotfix that fixes an issue that would cause zonal_statistics to crash if a polygon were outside of the raster’s bounding box.
- Adding error checking to ensure that target_pixel_size passed to warp_raster and align_and_resize_raster_stack are validated to ensure they are in the correct format. This solves an issue where an incorrect value, such as a single numerical value, resolve into readable exception messages.
- Added a gdal_warp_options parameter to align_and_resize_raster_stack and warp_raster whose contents get passed to gdal.Warp’s warpOptions parameter. This was implemented to expose the CUTLINE_TOUCH_ALL functionality but could be used for any gdal functionality.
- Modified rasterize API call to make burn_values and option_list both optional parameters, along with error checking to ensure a bad input’s behavior is understood.
- Exposing GeoTIFF creation options for all the pygeoprocessing.routing functions which create rasters. This is consistent with the creation options exposed in the main pygeoprocessing API.
- Removing 'mean_pixel_size' as a return value from get_raster_info, this is because this parameter is easily misused and easily calculated if needed. This is a “What good programmers need, not what bad programmers want.” feature.
- Hotfix to patch an infinite loop when aggregating upstream or downstream with custom rasters.
Fixed a handful of docstring errors.
Improved runtime of zonal_statistics by a couple of orders of magnitude for large vectors by using spatial indexes when calculating disjoint polygon overlap sets, using database transactions, and memory buffers.
Improved runtime performance of reproject_vector by using database transactions.
Improved logging for long runtimes in zonal_statistics.
Changed zonal_statistics API and functionality to aggregate across the FIDs of the aggregate vector. This is to be consistent with QGIS and other zonal statistics functionality. Additionally, fixed a bug where very small polygons might not get aggregated if they lie in the same pixel as another polygon that does not intersect it. The algorithm now runs in two passes:
- aggregate pixels whose centers intersect the aggregate polygons
- any polygons that were not aggregated are geometrically intersected with pixels to determine coverage.
Removed the calculate_raster_stats function since it duplicates GDAL functionality, but with a slower runtime, and now functions in pygeoprocessing that create rasters also calculate stats on the fly if desired.
Fixes an issue in get_raster_info and get_vector_info where the path to the raster/vector includes non-standard OS pathing (such as a NETCDF), info will still calculate info.
Added functionality to align_raster_stack and warp_raster to define a base spatial reference system for rasters if not is not defined or one wishes to override the existing one. This functionality is useful when reprojecting a rasters that does not have a spatial reference defined in the dataset but is otherwise known.
Added a weight_raster_path_band parameter to both flow_accumulation_d8 and flow_accumulation_mfd that allows the caller to use per-pixel weights from a parallel raster as opposed to assuming a weight of 1 per pixel.
Added a weight_raster_path_band parameter to both distance_to_channel_mfd and distance_to_channel_d8 that allows the caller to use per-pixel weights from a parallel raster as opposed to assuming a distance of 1 between neighboring pixels or sqrt(2) between diagonal ones.
Added an option to reproject_vector that allows a caller to specify which fields, if any, to copy to the target vector after reprojection.
Adding a check in align_and_resize_raster_stack for duplicate target output paths to avoid problems where multiple rasters are being warped to the same path.
Created a public merge_bounding_box_list function that’s useful for union or intersection of bounding boxes consistent with the format in PyGeoprocessing.
Added functionality in align_and_resize_raster_stack and warp_raster to use a vector to mask out pixel values that lie outside of the polygon coverage area. This parameter is called vector_mask_options and is fully documented in both functions. It is similar to the cutline functionality provided in gdal.Warp.
Fixed an issue in the flow_accumulation_* functions where a weight raster whose values were equal to the nodata value of the flow accumulation raster OR simply nodata would cause infinite loops.
- Exposing a parameter and setting reasonable defaults for the number of processes to allocate to convolve_2d and warp_raster. Fixes an issue where the number of processes could exponentiate if many processes were calling these functions.
- Fixing an issue on zonal_statistics and convolve_2d that would attempt to both read and write to the target raster with two different GDAL objects. This caused an issue on Linux where the read file was not caught up with the written one. Refactored to use only one handle.
- Fixing a rare race condition where an exception could occur in raster_calculator that would be obscured by an access to an object that had not yet been assigned.
- align_and_resize_raster_stack now terminates its process pool.
- Increased the timeout in joining raster_calculator’s stats worker. On a slow system 5 seconds was not quite enough time.
- Hotfixed a bug that would cause numpy arrays to be treated as broadcastable even if they were passed in “raw”.
- Fixing an issue with warp_raster that would round off bounding boxes for rasters that did not fit perfectly into the target raster’s provided pixel size.
- Cautiously joining all process pools to avoid a potential bug where a deamonized subprocess in a process pool may still have access to a raster but another process may require write access to it.
- Several PyGeoprocessing functions now take advantage of multiple CPU cores:
- raster_calculator uses a separate thread to calculate raster statistics in a nogil section of Cython code. In timing with a big rasters we saw performance improvements of about 35%.
- align_and_resize_raster_stack uses as many CPU cores, up to the number of CPUs reported by multiprocessing.cpu_count (but no less than 1), to process each raster warp while also accounting for the fact that gdal.Warp uses 2 cores on its own.
- warp_raster now directly uses gdal.Warp’s multithreading directly. In practice it seems to utilize two cores.
- convolve_2d attempts to use multiprocessing.cpu_count cpus to calculate separable convolutions per block while using the main thread to aggregate and write the result to the target raster. In practice we saw this improve runtimes by about 50% for large rasters.
- Fixed a bug that caused some nodata values to not be treated as nodata if there was a numerical roundoff.
- A recent GDAL upgrade (might have been 2.0?) changed the reference to nearest neighbor interpolation from ‘nearest’ to ‘near’. This PR changes PyGeoprocessing to be consistent with that change.
- raster_calculator can now also take “raw” arguments in the form of a (value, “raw”) tuple. The parameter value will be passed directly to local_op. Scalars are no longer a special case and need to be passed as “raw” parameters.
- Raising ValueError in get_raster_info and get_vector_info in cases where non-filepath non-GIS values are passed as parameters. Previously such an error would result in an unhelpful error in the GDAL library.
- PyGeoprocessing now supports Python 2 and 3, and is tested on python 2.7 and 3.6 Testing across multiple versions is configured to be run via tox.
- After testing (tox configuration included under tox-libcompat.ini), numpy requirement has been dropped to numpy>=1.10.0 and scipy has been modified to be scipy>=0.14.1,!=0.19.1.
- A dependency on future has been added for compatibility between python versions.
- Fixed a crash in pygeoprocessing.routing.flow_dir_mfd and flow_dir_d8 if a base raster was passed in that did not have a power of two blocksize.
- raster_calculator can now take numpy arrays and scalar values along with raster path band tuples. Arrays and scalars are broadcast to the raster size according to numpy array broadcasting rules.
- align_and_resize_raster_stack can now take a desired target projection which causes all input rasters to be warped to that projection on output.
- Hotfix patch to remove upper bound on required numpy version. This was causing a conflict with InVEST’s looser requirement. Requirement is now set to >=1.13.0.
- This release marks a feature-complete version of PyGeoprocessing with a full suite of routing and geoprocessing capabilities.
- pygeoprocessing.routing module has a flow_dir_mfd function that calculates a 32 bit multiple flow direction raster.
- pygeoprocessing.routing module has a flow_accumulation_mfd function that uses the flow direction raster from pygeoprocessing.routing.flow_dir_mfd to calculate a per-pixel continuous flow accumulation raster.
- pygeoprocessing.routing module has a distance_to_channel_mfd function that calculates distance to a channel raster given a pygeoprocessing MFD raster.
- pygeoprocessing.routing module has a distance_to_channel_d8 function that calculates distance to a channel raster given a pygeoprocessing D8 raster.
- Versioning is now handled by setuptools_scm rather than natcap.versioner. pygeoprocessing.__version__ is now fetched from the package metadata.
- Raster creation defaults now set “COMPRESS=LZW” for all rasters created in PyGeoprocessing, including internal temporary rasters. This option was chosen after profiling large raster creation runs on platter hard drives. In many cases processing time was dominated by several orders of magnitude as a write-to-disk. When compression is turned on overall runtime of very large rasters is significantly reduced. Note this otherwise increases the runtime small raster creation and processing by a small amount.
- pygeoprocessing.routing module now has a fill_pits, function which
- fills hydrological pits with a focus on runtime efficiency, memory space efficiency, and cache locality.
- pygeoprocessing.routing module has a flow_dir_d8 that uses largest slope to determine the downhill flow direction.
- pygeoprocessing.routing module has a flow_accumulation_d8 that uses a pygeoprocessing D8 flow direction raster to calculate per-pixel flow accumulation.
- Added a merge_rasters function to pygeoprocessing that will mosaic a set of rasters in the same projection, pixel size, and band count.
- Added an optional parameter to iterblocks to allow the largest_block to be set something other than the PyGeoprocessing default. This in turn allows the largest_block parameter in raster_calculator to be passed through to iterblocks.
- Upgraded PyGeoprocessing GDAL dependency to >=2.0.
- Added a working_dir optional parameter to zonal_statistics, distance_transform_edt, and convolve_2d which specifies a directory in which temporary files will be created during execution of the function. If set to None files are created in the default system temporary directory.
- Fixed an issue where NETCDF files incorrectly raised Exceptions in raster_calculator and rasterize because they aren’t filepaths.
- Added a NullHandler so that users wouldn’t get an error that a logger handler was undefined.
- Added ignore_nodata, mask_nodata, and normalize_kernel options to convolve_2d which make this function capable of adapting the nodata overlap with the kernel rather than zero out the result, as well as on the fly normalization of the kernel for weighted averaging purposes. This is in part to make this functionality more consistent with ArcGIS’s spatial filters.
- When testing for raster alignment raster_calculator no longer checks the string equality for projections or geotransforms. Instead it only checks raster size equality. This fixes issues where users rasters DO align, but have a slightly different text format of the WKT of projection. It also abstracts the problem of georeferencing away from raster_calculator that is only a grid based operation.
- Changed the error message in reclassify_raster so it’s more informative about how many values are missing and the values in the input lookup table.
- Added an optional parameter target_nodata to convolve_2d to set the desired target nodata value.
- Hotfix to fix an issue with iterblocks that would return signed values on unsigned raster types.
- Hotfix to correctly cite Natural Capital Project partners in license and update the copyright year.
- Hotfix to patch an issue that gave incorrect results in many PyGeoprocessing functions when a raster was passed with an NoData value. In these cases the internal raster block masks would blindly pass through on the first row since a test for numpy.ndarray == None is False and later x[False] is the equivalent of indexing the first row of the array.
Non-backwards compatible refactor of core PyGeoprocessing geoprocessing pipeline. This is to in part expose only orthogonal functionality, address runtime complexity issues, and follow more conventional GIS naming conventions. Changes include:
- Full test coverage for pygeoprocessing.geoprocessing module
- Dropping “uri” moniker in lieu of “path”.
- If a raster path is specified and operation requires a single band, argument is passed as a “(path, band)” tuple where the band index starts at 1 as convention for raster bands.
- Shapefile paths are assumed to operate on the first layer. It is so rare for a shapefile to have more than one layer, functions that would be confused by multiple layers have a layer_index that defaults to 0 that can be overridden in the call.
- Be careful, many of the parameter orders have been changed and renamed. Generally inputs come first, outputs last. Input parameters are often prefixed with “base_” while output parameters are prefixed with “target_”.
- Functions that take rasters as inputs must have their rasters aligned before the call to that function. The function align_and_resize_raster_stack can handle this.
- vectorize_datasets refactored to raster_calculator since that name is often used as a convention when referring to raster calculations.
- vectorize_points refactored to meaningful interpolate_points.
- aggregate_by_shapefile refactored to zonal_statistics and now returns a dictionary rather than a named tuple.
- All functions that create rasters expose the underlying GeoTIFF options through a default parameter gtiff_creation_options which default to “(‘TILED=YES’, ‘BIGTIFF=IF_SAFER’)”.
- Individual functions for raster and vector properties have been aggregated into get_raster_info and get_vector_info respectively.
- Introducing warp_raster to wrap GDAL’s ReprojectImage functionality that also works on bounding box clips.
- Removed the temporary_filename() paradigm. Users should manage temporary filenames directly.
- Numerous API changes from the 0.3.x version of PyGeoprocessing.
Fixing an issue with aggregate_raster_values that caused a crash if feature IDs were not in increasing order starting with 0.
Removed “create_rat/create_rat_uri” and migrated it to natcap.invest.wind_energy; the only InVEST model that uses that function.
Fixing an issue with aggregate_raster_values that caused a crash if feature IDs were not in increasing order starting with 0.
Removed “create_rat/create_rat_uri” and migrated it to natcap.invest.wind_energy; the only InVEST model that uses that function.
- Fixing a memory leak with large polygons when calculating disjoint set.
- Hotfix to patch an issue with watershed delineation packing that causes some field values to lose precision due to default field widths being set.
- Hotfix patch to address an issue in watershed delineation that doesn’t pack the target watershed output file. Half the shapefile consists of features polygonalized around nodata values that are flagged for deletion, but not removed from the file. This patch packs those features and returns a clean watershed.
- Added rel_tol and abs_tol parameters to testing.assertions to be consistent with PEP485 and deal with real world testing situations that required an absolute tolerance.
- Removed calls to logging.basicConfig throughout pygeoprocessing. Client applications may need to adjust their logging if pygeoprocessing’s log messages are desired.
- Added a flag to aggregate_raster_values_uri that can be used to indicate incoming polygons do not overlap, or the user does not care about overlap. This can be used in cases where there is a computational or memory bottleneck in calculating the polygon disjoint sets that would ultimately be unnecessary if it is known a priori that such a check is unnecessary.
- Fixed an issue where in some cases different nodata values for ‘signal’ and ‘kernel’ would cause incorrect convolution results in convolve_2d_uri.
- Added functionality to pygeoprocessing.iterblocks to iterate over largest memory aligned block that fits into the number of elements provided by the parameter. With default parameters, this uses a ceiling around 16MB of memory per band.
- Added functionality to pygeoprocessing.iterblocks to return only the offset dictionary. This functionality would be used in cases where memory aligned writes are desired without first reading arrays from the band.
- Refactored pygeoprocessing.convolve_2d_uri to use iterblocks to take advantage of large block sizes for FFT summing window method.
- Refactoring source side to migrate source files from [REPO]/pygeoprocessing to [REPO]/src/pygeoprocessing.
- Adding a pavement script with routines to fetch SVN test data, build a virtual environment, and clean the environment in a Windows based operating system.
- Adding transform_bounding_box to calculate the largest projected bounding box given the four corners on a local coordinate system.
- Removing GDAL, Shapely from the hard requirements in setup.py. This will allow pygeoprocessing to be built by package managers like pip without these two packages being installed. GDAL and Shapely will still need to be installed for pygeoprocessing to run as expected.
- Fixed a defect in pygeoprocessing.testing.assert_checksums_equal preventing BSD-style checksum files from being analyzed correctly.
- Fixed an issue in reclassify_dataset_uri that would cause an exception if the incoming raster didn’t have a nodata value defined.
- Fixed a defect in pygeoprocessing.geoprocessing.get_lookup_from_csv where the dialect was unable to be detected when analyzing a CSV that was larger than 1K in size. This fix enables the correct detection of comma or semicolon delimited CSV files, so long as the header row by itself is not larger than 1K.
- Intra-package imports are now relative. Addresses an import issue for users with multiple copies of pygeoprocessing installed across multiple Python installations.
- Exposed cython routing functions so they may be imported from C modules.
- get_lookup_from_csv attempts to determine the dialect of the CSV instead of assuming comma delimited.
- Added relative numerical tolerance parameters to the PyGeoprocessing raster and csv tests with in the same API style as numpy.testing.allclose.
- Fixed an incomparability with GDAL 1.11.3 bindings that expects a boolean type in band.ComputeStatistics. Before this fix PyGeoprocessing would crash with a TypeError on many operations.
- Fixed a defect in pygeoprocessing.routing.calculate_transport where the nodata types were cast as int even though the base type of the routing rasters were floats. In extreme cases this could cause a crash on a type that could not be converted to an int, like an inf, and in subtle cases this would result in nodata values in the raster being ignored during routing.
- Added functions to construct raster and vectors on disk from reasonable datatypes (numpy matrices for rasters, lists of Shapely geometries for vectors).
- Fixed an issue where reproject_datasource_uri would add geometry that couldn’t be projected directly into the output datasource. Function now only adds geometries that transformed without error and reports if any features failed to transform.
- Added file flushing and dataset swig deletion in reproject_datasource_uri to handle a race condition that might have been occurring.
- Fixed an issue when “None” was passed in on new raster creation that would attempt to directly set that value as the nodata value in the raster.
- Added basic filetype-specific assertions for many geospatial filetypes, and tests for these assertions. These assertions are exposed in pygeoprocessing.testing.
- Pygeoprocessing package tests can be run by invoking python setup.py nosetests. A subset of tests may also be run from an installed pygeoprocessing distribution by calling pygeoprocessing.test().
- Fixed an issue with reclassify dataset that would occur when small rasters whose first memory block would extend beyond the size of the raster thus passing in “0” values in the out of bounds area. Reclassify dataset identified these as valid pixels, even though vectorize_datsets would mask them out later. Now vectorize_datasets only passes memory blocks that contain valid pixel data to its kernel op.
- Added support for very small AOIs that result in rasters less than a pixel wide. Additionally an all_touched flag was added to allow the ALL_TOUCHED=TRUE option to be passed to RasterizeLayer in the AOI mask calculation.
- Added watershed delineation routine to pygeoprocessing.routing.delineate_watershed. Operates on a DEM and point shapefile, optionally snaps outlet points to nearest stream as defined by a thresholded flow accumulation raster and copies the outlet point fields into the constructed watershed shapefile.
- Fixing a memory leak in block caches that held on to dataset, band, and block references even after the object was destroyed.
- Add an option to route_flux that lets the current pixel’s source be included in the flux, or not. Previous version would include on the source no matter what.
- Now using natcap.versioner for versioning instead of local versioning logic.
- Adding MinGW-specific compiler flags for statically linking pygeoprocessing binaries against libstdc++ and libgcc. Fixes an issue on many user’s computers when installing from a wheel on the Python Package Index without having two needed DLLs on the PATH, resulting in an ImportError on pygeoprocessing.geoprocessing_core.pyd.
- Fixing an issue with versioning where ‘dev’ was displayed instead of the version recorded in pygeoprocessing/__init__.py.
- Adding all pygeoprocessing.geoprocessing functions to pygeoprocessing.__all__, which allows those functions to appear when calling help(pygeoprocessing).
- Adding routing_core.pxd to the manifest. This fixes an issue where some users were unable to compiler pygeoprocessing from source.
- Fixed a bug on the test that determines if a raster should be memory blocked. Rasters were not getting square blocked if the memory block was row aligned. Now creates 256x256 blocks on rasters larger than 256x256.
- Updates to reclassify_dataset_uri to use numpy.digitize rather than Python loops across the number of keys.
- More informative error messages raised on incorrect bounding box mode.
- Updated docstring on get_lookup_from_table to indicate the headers are case insensitive.
- Added updates to align dataset list that report which dataset is being aligned. This is helpful for logging feedback when many datasets are passed in that don’t take long enough to get a report from the underlying reproject dataset function.
- pygeoprocessing.routing.routing_core includes pxd to be cimportable from a Cython module.
- Fixed a library wide issue relating to the underlying numpy types of GDT_Byte Datasets. Now correctly identify the signed and unsigned versions and removed all instances where code used to mod byte data to unsigned data and correctly creates signed/unsigned byte datasets during resampling.
- Removed extract_band_and_nodata function since it exposes the underlying GDAL types.
- Removed reclassify_by_dictionary since reclassify_dataset_uri provided almost the same functionality and was widely used.
- Removed the class OrderedDict that was not used.
- Removed the function calculate_value_not_in_dataset since it loaded the entire dataset into memory and was not useful.
- Fixed an issue on reclassifying signed byte rasters that had negative nodata values but the internal type stored for vectorize datasets was unsigned.
- Package logger objects are now identified by python hierarchical package paths (e.g. pygeoprocessing.routing)
- Fixed an issue where rasters that had undefined nodata values caused striping in the reclassify_dataset_uri function.
- Fixing LICENSE.TXT to .txt issue that keeps reoccurring.
- Fixed an issue where int32 dems with INT_MIN as the nodata value were being treated as real DEM values because of an internal cast to a float for the nodata type, but a cast to double for the DEM values.
- Fixed an issue where flat regions, such as reservoirs, that could only drain off the edge of the DEM now correctly drain as opposed to having undefined flow directions.
- Fixed a memory issue for DEMs on the order of 25k X 25k, still may have issues with larger DEMs.
- Fixed an issue so tox correctly executes on the repository.
- Created a history file to document current and previous releases.
- Created an informative README.rst.
- Fixing issue that caused “LICENSE.TXT not found” during pip install.
- Fixing issue with automatic versioning scheme.
- First release on PyPI.
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