This module covers choosing data storage formats for particular purposes as well as tools for working with rasters. is 'empty', # the geojson spec does not define a proper null-geometry type, # however, it does allow geometry types with 'empty' coordinates to be interpreted as null-geometries, # get indexes of start and end points of the ring, # extract the points that make up the ring. Closed. You signed in with another tab or window. ## be written exclusively using saveShp, saveShx, and saveDbf respectively. The Library not installed. Copy link Quote reply Z-M-Y commented Dec 25, 2019. # any shape that is not null should have at least one point, and only those should be sent here. See: http://ipython.readthedocs.io/en/stable/config/integrating.html, # default list methods and attributes of this class, # plus field names (random order if Python version < 3.6). # could also mean that earlier code failed to add points to a non-null shape. The Esri document describes the shp and shx file formats. Expected floats. The code has already been written by others, you just have to use it Next, make sure that pkg-config can correctly report the compilation flags needed to link to igraph; the following command should list a bunch of compiler and linker flags instead of … Add details and clarify the problem by editing this post. You signed in with another tab or window. The orientation of the ring is assumed to be clockwise, unless ccw, # finally, yield the second coordinate to the end to allow checking the last triplet, # add point to triplet (but not if duplicate), # check that triplet does not form a straight line (not a triangle), # check that triplet has the same orientation as the ring (means triangle is inside the ring), # check that triplet centroid is truly inside the ring, # failed to get sample point from this triplet, # remove oldest triplet coord to allow iterating to next triplet, 'Unexpected error: Unable to find a ring sample point.'. Have a question about this project? >>> # Create a Record with one field, normally the record is created by the Reader class, A Record should be created by the Reader class, :param field_positions: A dict mapping field names to field positions, :param oid: The object id, an int (optional), __getattr__ is called if an attribute is used that does, not exist in the normal sense. SHP and DBF files can also. """, # For Null shapes create an empty points list for consistency, # All shape types capable of having a bounding box, # Read points - produces a list of [x,y] values, # Seek to the end of this record as defined by the record header because, # the shapefile spec doesn't require the actual content to meet the header. Therefore open the terminal: sudo apt-get install python-pip sudo easy_install pyshp If you already installed python-pip you can skip the first line. Because of the similarities between these two shape types they are created using a single method called "poly". Also, you can get the issue if you are trying to import a module of a library which not installed in your virtual environment. Parts, are designated by their starting index in geometry record's, list of shapes. TRIANGLE_FAN, OUTER_RING, INNER_RING, FIRST_RING, or RING. Shapefiles are usually not large, # See if a shapefile name was passed as an argument, "Shapefile Reader requires a shapefile or file-like object. ", # When reading a file, pyshp converts NODATA m values to None, so here we make sure to convert them back to NODATA. 4 comments Comments. ", # start - 4 bytes is the content length field, """Creates a dbf attribute record. # move to next pair of vertices, retaining info as possible, """Return a sample point guaranteed to be within a ring, by efficiently, finding the first centroid of a coordinate triplet whose orientation. This form… # if edge's X values both right of the point, must hit, # compute intersection of pgon segment with +X ray, note. Before, adding records you must add fields for the record values using the, field() method. ImportError: No module named pyshp. If not a ShapefileException is raised. # first iterate rings and classify as exterior or hole, # shapefile format defines a polygon as a sequence of rings, # where exterior rings are clockwise, and holes counterclockwise, # if only one exterior, then all holes belong to that exterior, # multiple exteriors, ie multi-polygon, have to group holes with correct exterior, # shapefile format does not specify which holes belong to which exteriors, # so have to do efficient multi-stage checking of hole-to-exterior containment, # first determine each hole's candidate exteriors based on simple bbox contains test, # then, for holes with still more than one possible exterior, do more detailed hole-in-ring test, # check that hole sample point is inside exterior, # if still holes with more than one possible exterior, means we have an exterior hole nested inside another exterior's hole, # exterior candidate with the smallest area is the hole's most immediate parent, # separate out holes that are orphaned (not contained by any exterior), 'Shapefile shape has invalid polygon: found orphan hole (not contained by any of the exteriors); interpreting as exterior. 5 comments Comments. Comments. "Failed to write elevation extremes for record %s. Shape types are, usually point, polyline, or polygons. If the z (elevation) value is not included, it defaults to 0. edges which are entirely to one side of the test ray. Note that each of these functions is a wrapper around the core json function with the same name, and will pass through any additional arguments. Shapely is a Python package full of wonderful possibilities for geometric stuff to do with your data. 0 Kudos All Posts; Previous Topic; Next Topic; 10 Replies by ClintonDow1. ## if self.recNum != self.shpNum: ## raise ShapefileException("When saving both the dbf and shp file, ", ## "the number of records (%s) must correspond ", ## "with the number of shapes (%s)" % (self.recNum, self.shpNum)), ## # Create a unique file name if one is not defined. Expected floats", # if m values are stored as 3rd/4th dimension, # 0-index position of m value is 3 if z type (x,y,z,m), or 2 if m type (x,y,m), "Failed to write measure values for record %s. # Note: missing z values are autoset to 0, but not sure if this is ideal. You need to tell your system where to search for QGIS libraries and appropriate Python modules if they are not in a well-known location - otherwise Python will complain: >>>importqgis.core ImportError: No module named qgis.core This can be fixed by setting the PYTHONPATHenvironment variable. For more informationabout this format please read the well-written "ESRI Shapefile TechnicalDescription - July 1998" located at http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf. A line must have at least two points. Provides the GeoJSON __geo_interface__ to return a Feature dictionary. All of the GeoJSON Objects implemented in this library can be encoded and decoded into raw GeoJSON with the geojson.dump, geojson.dumps, geojson.load, and geojson.loads functions. File "CommandLine_Clip.py", line 15, in
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