shprewind(1) [debian man page]
SHAPELIB(1) User Commands SHAPELIB(1) NAME
shprewind - fix polygon ring orientations in ESRI shapefiles SYNOPSIS
shprewind infile outfile DESCRIPTION
Makes a copy of the shapefile infile to outfile and fixes the orientation of points in the rings of Polygon, PolygonZ, and PolygonM typed shapes to conform to the shapefile specification. According to the specification, the vertices of outer rings should be oriented clockwise on the X/Y plane, and those of inner rings counterclockwise. Shapefiles actually consist of two files with the same basename and extensions .shp and .shx (or .SHP and .SHX) containing the shape data and shape index respectively. The files to open are determined by first stripping any filename extension from infile and attempting to open the files infile.shp or infile.SHP, and infile.shx or infile.SHX for the respective data and index files. The files to create from outfile are determined by stripping any filename extension from outfile and appending .shp and .shx suffixes for the respective data and index files. EXIT STATUS
0 Successful program execution. 1 Missing infile or outfile arguments, failed to open shapefile infile or create shapefile outfile. DIAGNOSTICS
The following diagnostics may be issued on stdout: Unable to open:infile Unable to create:outfile count objects rewound. AUTHORS
Frank Warmerdam (warmerdam@pobox.com) is the maintainer of the shapelib shapefile library. Joonas Pihlaja (jpihlaja@cc.helsinki.fi) wrote this man page. BUGS
The implementation assumes that there is at most one outer ring in each shape, that it is the first ring in a shape, and all other rings in a shape are inner rings. Polygons inside MultiPatch shape types aren't rewound. SEE ALSO
dbfadd(1), dbfcreate(1), dbfdump(1), dbf_dump(1), shpadd(1), shpcreate(1), shpdump(1) shapelib OCTOBER 2004 SHAPELIB(1)
Check Out this Related Man Page
SHAPELIB(1) User Commands SHAPELIB(1) NAME
shpdump - dump an ESRI shapefile as text SYNOPSIS
shpdump [-validate] file DESCRIPTION
Prints the contents of the shapefile file to standard output in textual format. Shapefiles actually consist of two files with the same basename and extensions .shp and .shx (or .SHP and .SHX) containing the shape data and shape index respectively. The files to open are determined by first stripping any filename extension from file and attempting to open the files file.shp or file.SHP, and file.shx or file.SHX for the respective data and index files. Output consists of a header giving number and type of shapes in the file and the bounds for the minimum and maximum X, Y, Z, and M values appearing in the shapes. The header is followed by the geometric data for each shape in the file. All shapes in the file should be of the same type, except that NullShape typed shapes may be intermixed with any other type. The header has the form Shapefile Type: type # of Shapes: count File Bounds: (minX,minY,minZ,minM) to (maxX,maxY,maxZ,maxM) See section SHAPE TYPES below for the list of possible shape types. Next for each shape in the file a header giving it's shape_index, it's type type, number of vertices nVertices, number of parts nParts, and bounding box is given, followed by the vertex data of each part. Shape: shape_index (type) nVertices=nVertices, nParts=nParts Bounds: (minX,minY,minZ,minM) to (maxX,maxY,maxZ,maxM) vertices of the first part + vertices of the second part... + vertices of the last part The shape_index of a shape is the number of the shape starting from zero in the shape file. Each vertex has the form (X,Y,Z,M) If there are multiple parts then the type of the part is appended appended to first vertex of each part, and the first vertex of the second and following parts is preceded by a plus (+) sign. The part type is Ring for all shape types except MultiPatch where it is the type of a surface patch. See below for the description of possible part types. SHAPE TYPES
Each type of shape except MultiPatch typed shapes comes in three flavours: The normal unsuffixed type, where points lie in X/Y-space; a type with suffix M where points lie in X/Y-space and additionally have a measure value in M-space; and finally a type with suffix Z where points lie in X/Y/Z-space and also have a measure value in M-space. NullShape A shape without data. Shapes of this type may be intermixed with other shapes and are sometimes used to represented deleted or missing geometric data for a shape. Point or PointZ or PointM A single point. Arc or ArcZ or ArcM Piecewise linear paths. Shapes of this type may consist of multiple parts which may or may not intersect and/or connect. Arcs are called PolyLines in the shapefile specification. Polygon or PolygonZ or PolygonM Polygon shapes consist of one or more parts, called rings, that each define a closed path. Rings must contain at least four ver- tices with the first and last vertices being equal, and must not self-intersect. For shapes of type Polygon, the rings define a polygon with optional holes by giving the vertices of inner rings a counterclockwise orientation and the vertices of outer rings a clockwise orientation. Intersection and orientation is always computed in X/Y-space and never in X/Y/M-space. MultiPoint or MultiPointZ or MultiPointM A set of points. MultiPatch A MultiPatch represents one or more surfaces in X/Y/Z-space, and consists of a number of parts called it's surface patches. Each surface patch describes a either a surface or a hole in another surface, depending on the type of the patch. Patches may share a common boundary but may not otherwise intersect. The type of a patch may be one of TriangleStrip A set of connected triangles. The first three points define the first triangle and every following point defines a new tri- angle using the new point and the two previous points. TriangleFan A set of connected triangles. The first three points define the first triangle and every following point defines a new tri- angle using the previous point, the current point, and the first point, thus forming a fan of triangles around the first point. OuterRing The outer ring of a sequence of rings defining a polygon with holes. All following parts of type InnerRing are taken to be the holes of the polygon. The sequence of rings ends with the first non-InnerRing typed part or the part of the shape, whichever comes first. InnerRing An inner ring in a sequence of rings defining a polygon with holes. This type of part may only follow an OuterRing or other InnerRing typed parts. FirstRing The first in a sequence of rings defining a polygon of unspecified type. The following parts of type Ring defines the other rings in the polygon. This type of part is used when the innerness or outerness of a polygon isn't known or applicable. The sequence of rings defining the polygon ends with the first non-Ring typed part or the last part of the shape, whichever comes first. Ring A ring in a sequence of rings defining a polygon of unspecified type. It may only follow a FirstRing or other Ring typed parts. UknownPartType This type is returned for parts whose type isn't recognised. UnknownShapeType This type is returned for shapes whose type isn't recognised. OPTIONS
-validate Performs validation on the orientation of inner and outer rings in Polygon, PolygonZ, and PolygonM objects. According to the shape- file specification outer rings should be given a clockwise orientation, and inner rings that define holes a counterclockwise orien- tation. If some rings of a shape are oriented the wrong way around then the following message is output after dumping that shape: count rings wound in the wrong direction. In addition the total number of shapes with problem rings is output after the last shape has been dumped: count object has invalid ring orderings. EXIT STATUS
0 Successful program execution. 1 No shapefile file was given or it couldn't be opened. EXAMPLE
$ shpdump shapefile.shp Shapefile Type: Arc # of Shapes: 3 File Bounds: ( 3531586.750, 7253086.100,0,0) to ( 3536417.463, 7778375.875,0,0) Shape:0 (Arc) nVertices=2, nParts=1 Bounds:( 3536397.797, 7253086.100, 0, 0) to ( 3536417.463, 7253163.597, 0, 0) ( 3536397.797, 7253163.597, 0, 0) Ring ( 3536417.463, 7253086.100, 0, 0) Shape:1 (Arc) nVertices=3, nParts=1 Bounds:( 3458966.390, 7373335.808, 0, 0) to ( 3459141.856, 7373474.681, 0, 0) ( 3458966.390, 7373474.681, 0, 0) Ring ( 3458979.042, 7373466.273, 0, 0) ( 3459141.856, 7373335.808, 0, 0) Shape:2 (Arc) nVertices=7, nParts=1 Bounds:( 3531586.750, 7777880.500, 0, 0) to ( 3532930.206, 7778375.875, 0, 0) ( 3531586.750, 7777880.500, 0, 0) Ring ( 3532228.265, 7778072.455, 0, 0) ( 3532310.897, 7778119.445, 0, 0) ( 3532367.866, 7778144.877, 0, 0) ( 3532440.559, 7778168.920, 0, 0) ( 3532506.504, 7778190.785, 0, 0) ( 3532930.206, 7778375.875, 0, 0) $ DIAGNOSTICS
The following diagnostics may be issued on stdout: Unable to open:file AUTHORS
Frank Warmerdam (warmerdam@pobox.com) is the maintainer of the shapelib shapefile library. Joonas Pihlaja (jpihlaja@cc.helsinki.fi) wrote this man page. BUGS
The -validate option supports only one outer ring in a polygonal shape and assumes that the first ring in a shape is the outer ring. It doesn't support polygons inside MultiPatch shapes. The X and Y coordinates of a point are printed to three decimal places only. SEE ALSO
dbfadd(1), dbfcreate(1), dbfdump(1), dbf_dump(1), shpadd(1), shpcreate(1), shprewind(1) shapelib OCTOBER 2004 SHAPELIB(1)