# File: lib/Geo/H3.pm ## NAME Geo::H3 - H3 Geospatial Hexagon Indexing System ## SYNOPSIS use Geo::H3; my $gh3 = Geo::H3->new; my $h3 = $gh3->h3(index => $int); #isa Geo::H3::Index my $h3 = $gh3->h3(string => $string); #isa Geo::H3::Index my $geo = $gh3->geo(lat=>$lat, lon=>$lon); #isa Geo::H3::Geo my $h3 = $geo->h3($resolution); #isa Geo::H3::Index my $center = $h3->center; #isa Geo::H3::GeoCoord my $lat = $center->lat; #isa Double WGS-84 Decimal Degrees my $lon = $center->lon; #isa Double WGS-84 Decimal Degrees my $distance = $center->pointDistM($geo); #isa Double meters ## DESCRIPTION This Perl distribution provides a Perl Object Oriented interface to the H3 Core Library. It accesses the H3 C library using [libffi](https://github.com/libffi/libffi) and [FFI::Platypus](https://metacpan.org/pod/FFI::Platypus). H3 is a geospatial indexing system that partitions the world into hexagonal cells. The H3 Core Library implements the H3 grid system. It includes functions for converting from latitude and longitude coordinates to the containing H3 cell, finding the center of H3 cells, finding the boundary geometry of H3 cells, finding neighbors of H3 cells, and more. The H3 Core Library can be installed from Uber's H3 repository on GitHub [https://github.com/uber/h3](https://github.com/uber/h3) which is well documented at [https://h3geo.org/docs/](https://h3geo.org/docs/). ### CONVENTIONS The Geo::H3 lib is an Object Oriented wrapper on top of the [Geo::H3::FFI](https://metacpan.org/pod/Geo::H3::FFI) library. Geo::H3 was written as a wrapper so that in the future we are able to re-write against different backends such as the yet to be developed Geo::H3::XS backend. #### libh3 - Latitude and longitue cordinates are in radians WGS-84 - H3 Index values are handled as uint64 integers - GeoCoord values are handled as C structures with lat and lon - GeoBoundary values are handled as C structures with num_verts and verts #### Geo::H3::FFI - Latitude and Longitue cordinates are in radians WGS-84 - H3 Index values are handled as uint64 integers - GeoCoord values are handled as Geo::H3::FFI::Struct::GeoCoord objects - GeoBoundary values are handled as Geo::H3::FFI::Struct::GeoBoundary objects #### Geo::H3 - Latitude and longitue cordinates are in decimal degrees WGS-84 - H3 Index values are handled as Geo::H3::Index objects - GeoCoord values are handled as Geo::H3::GeoCoord objects - GeoBoundary values are handled as Geo::H3::GeoBoundary objects ## CONSTRUCTORS ### h3 Returns a [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) object my $h3 = $gh3->h3(index => $int); #isa Geo::H3::Index my $h3 = $gh3->h3(string => $string); #isa Geo::H3::Index my $h3 = Geo::H3::Index->new(index => $index); #isa Geo::H3::Index ### geo Returns a [Geo::H3::Geo](https://metacpan.org/pod/Geo::H3::Geo) object my $geo = $gh3->geo(lat=>$lat_deg, lon=>$lon_deg); #isa Geo::H3::Geo my $geo = Geo::H3::Geo->new(lat=>$lat_deg, lon=>$lon_deg); #isa Geo::H3::Geo ## SEE ALSO [https://h3geo.org/](https://h3geo.org/), [https://github.com/uber/h3/](https://github.com/uber/h3/), [Geo::H3::FFI](https://metacpan.org/pod/Geo::H3::FFI) ## INSTALLATION [Geo::H3](https://metacpan.org/pod/Geo::H3) has some pretty deep requirements that are not available in many OS repositories. For RedHat and CentOS 7 users, I have have built RPMs and placed them on my [Linux Yum Repository](http://linux.davisnetworks.com/el7/) To install the distribution with all dependencies - CentOS 7 $ sudo yum install http://linux.davisnetworks.com/el7/updates/mrdvt92-release-8-2.el7.mrdvt92.noarch.rpm $ sudo yum install 'perl(Geo::H3)' To install the additional dependencies for the example script perl-Geo-H3-geo-to-googleearth.pl $ sudo yum install 'perl(Geo::GoogleEarth::Pluggable)' 'perl(Geo::GoogleEarth::Pluggable::Plugin::Styles)' 'perl(Path::Class)' ## AUTHOR Michael R. Davis ## COPYRIGHT AND LICENSE MIT License Copyright (c) 2021 Michael R. Davis Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # File: lib/Geo/H3/Index.pm ## NAME Geo::H3::Index - H3 Geospatial Hexagon Indexing System ## SYNOPSIS use Geo::H3::Index; my $h3 = Geo::H3::Index->new(index=$index); #isa Geo::H3::Index my $centroid = $h3->geo; #isa Geo::H3::GeoCoord my $lat = $center->lat; #isa double WGS-84 Decimal Degrees my $lon = $center->lon; #isa double WGS-84 Decimal Degrees ## DESCRIPTION Perl API to the H3 Geospatial Hexagon Indexing System. ## CONSTRUCTORS ### new my $geo = Geo::H3::Index->new(index=>$index); ## PROPERTIES ### index Returns the H3 index uint64 representation ### string Returns the H3 string representation. ### resolution Returns the resolution of the index. ### baseCell Returns the base cell number of the index. ### isValid Returns non-zero if this is a valid H3 index. ### isResClassIII Returns non-zero if this index has a resolution with Class III orientation. ### isPentagon Returns non-zero if this index represents a pentagonal cell. ### maxFaceCount Returns the maximum number of icosahedron faces the given H3 index may intersect. ### area Returns the area in square meters of this index. ### areaApprox Returns the average area in square meters of indexes at this resolution. ### edgeLength Returns the exact edge length in meters of this index. ### edgeLengthApprox Returns the average edge length in meters of indexes at this resolution. ## METHODS ### geo Returns the centroid of the index as a [Geo::H3::Geo](https://metacpan.org/pod/Geo::H3::Geo) object. ### geoBoundary Returns the boundary of the index as a [Geo::H3::GeoBoundary](https://metacpan.org/pod/Geo::H3::GeoBoundary) object ### parent Returns a parent index of this index as a [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) object. my $parent = $h3->parent; #next larger resolution my $parent = $h3->parent(1); #isa Geo::H3::Index ### children Returns the children of the index as an array reference of [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) objects. my $children = $h3->children(12); #isa ARRAY my $children = $h3->children; #next smaller resolution ### centerChild Returns the center child (finer) index contained by this index at given resolution. my $centerChild = $index->centerChild; #isa Geo::H3::Index my $centerChild = $index->centerChild(12); #isa Geo::H3::Index ### kRing Returns k-rings indexes within k distance of the origin index. my $list $index->kRing($k); #isa ARRAY of L objects ### kRingDistances Returns a hash reference where the keys are the H3 index and values are the k distance for the given index and k value. my $hash = $index->kRingDistances($k); ### hexRange my $indexes = $index->hexRange($k); ### hexRangeDistances Returns a hash reference where the keys are the H3 index and values are the k distance for the given index and k value. my $hash = $index->hexRangeDistances($k); ### hexRing Returns the hex ring of this index as an array reference of [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) objects my $hexes = $h3->hexRing; #default k = 1 my $hexes = $h3->hexRing(5); #isa ARRAY ### areNeighbors Returns whether or not the provided H3Indexes are neighbors. my $areNeighbors = $start_index->areNeighbors($end_index); ### line Returns the indexes starting at this index to the given end index as array reference of [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) objects. my $list_aref = $start_index->line($end_index); ### distance Returns the distance in grid cells between this index to the given end index. my $distance = $start_index->distance($end_index); ### struct Returns the H3 index as an [FFI::C](https://metacpan.org/pod/FFI::C) struct in the [Geo::H3::FFI::Struct::Index](https://metacpan.org/pod/Geo::H3::FFI::Struct::Index) namespace ## SEE ALSO [Geo::H3](https://metacpan.org/pod/Geo::H3), [Geo::H3::FFI](https://metacpan.org/pod/Geo::H3::FFI) ## AUTHOR Michael R. Davis ## COPYRIGHT AND LICENSE MIT License Copyright (c) 2021 Michael R. Davis Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # File: lib/Geo/H3/Geo.pm ## NAME Geo::H3::Geo - H3 Geospatial Hexagon Indexing System ## SYNOPSIS use Geo::H3::Geo; my $geo = Geo::H3::Geo->new(lat=>$lat, lon=>$lon); #isa Geo::H3::Geo my $h3 = $geo->h3($resolution); #isa Geo::H3::Index my $center = $h3->center; #isa Geo::H3::Geo my $lat = $center->lat; #isa double WGS-84 Decimal Degrees my $lon = $center->lon; #isa double WGS-84 Decimal Degrees ## DESCRIPTION Perl API to the H3 Geospatial Hexagon Indexing System. ## CONSTRUCTORS ### new my $geo = Geo::H3::Geo->new(lat => $lat, lon => $lon); ## PROPERTIES ### lat Returns the latitude in degrees ### lon Returns the longitude in degrees ## METHODS ### struct ### h3 Indexes the location at the specified resolution, returning the index object [Geo::H3::Index](https://metacpan.org/pod/Geo::H3::Index) of the cell containing the location. my $h3 = $geo->h3; #default resolution is 0 my $h3 = $geo->h3(7); #isa Geo::H3::H3Index Returns undef on error. ### distance Returns in meters the "great circle" or "haversine" distance between pairs of points (lat/lon pairs). my $distance = $geoA->distance($geoB); #isa Double ## SEE ALSO [Geo::H3](https://metacpan.org/pod/Geo::H3), [Geo::H3::FFI](https://metacpan.org/pod/Geo::H3::FFI) ## AUTHOR Michael R. Davis ## COPYRIGHT AND LICENSE MIT License Copyright (c) 2021 Michael R. Davis Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # File: lib/Geo/H3/GeoBoundary.pm ## NAME Geo::H3::GeoBoundary - H3 Geospatial Hexagon Indexing System ## SYNOPSIS use Geo::H3::GeoBoundary; my $gb = Geo::H3::GeoBoundary->new(gb=>$gb); #isa Geo::H3::GeoBoundary my $gb = Geo::H3::GeoBoundary->new(gb=>$gb, ffi=>$ffi); #isa Geo::H3::GeoBoundary ## DESCRIPTION Perl API to the H3 Geospatial Hexagon Indexing System. ## CONSTRUCTORS ### new my $geo = Geo::H3::GeoBoundary->new(gb=>$gb); ## PROPERTIES ### gb Returns the H3 GeoBoundray Object as returned from the API ## METHODS ### coordinates Returns an OGC compatible closed polygon as an array reference of hashes i.e. \[{lat=>$lat, lon=>$lon}, ...\]. ## SEE ALSO [Geo::H3](https://metacpan.org/pod/Geo::H3), [Geo::H3::FFI](https://metacpan.org/pod/Geo::H3::FFI) ## AUTHOR Michael R. Davis ## COPYRIGHT AND LICENSE MIT License Copyright (c) 2021 Michael R. Davis Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # File: scripts/perl-Geo-H3-geo-to-googleearth.pl ## NAME perl-Geo-H3-geo-to-googleearth.pl - Creates a Google Earth document from Coordinates, H3, Parent, Children and Hex Ring.