Geoviews

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This is a major release with a number of important enhancements and bug fixes:

Features:

- Complete overhaul of geometry handling including support for geometry with holes and geometry dictionary interface ([244](https://github.com/holoviz/geoviews/pull/244), #249](https://github.com/holoviz/geoviews/pull/249))
- Support for holoviews FreehandDraw stream ([219](https://github.com/holoviz/geoviews/pull/219))
- Add `gv.load_tiff` and `gv.RGB.load_tiff` helpers ([221](https://github.com/holoviz/geoviews/pull/221), #233](https://github.com/holoviz/geoviews/pull/233))
- Added support for holoviews padding option ([228](https://github.com/holoviz/geoviews/pull/228))

Enhancements:

- Drop bokeh save tool when tile source is used ([257](https://github.com/holoviz/geoviews/pull/257))
- Compatibility with cartopy 0.17 ([254](https://github.com/holoviz/geoviews/pull/254))

Bug fixes:

- Improved handling of Point geometries in geopandas dataframe ([204](https://github.com/holoviz/geoviews/pull/204))
- Fixes for projecting draw tool data ([205](https://github.com/holoviz/geoviews/pull/205))
- Improvements and fixes for handling of QuadMesh projections ([250](https://github.com/holoviz/geoviews/pull/250))
- Fixes for Image longitude wrapping ([260](https://github.com/holoviz/geoviews/pull/260))

=============

This is a bug fix release which includes a number of important fixes and enhancements.

Enhancements:

- Geopandas interface now supports point geometries ([186](https://github.com/holoviz/geoviews/pull/186))
- Geopandas data now supported in the ``.to`` conversion API ([186](https://github.com/holoviz/geoviews/pull/186))

Fixes:

- Fixed some issues to do with tile source attributions ([176](https://github.com/holoviz/geoviews/pull/176))
- Fixed bug projecting rectilinear QuadMesh ([178](https://github.com/holoviz/geoviews/pull/178))
- Improvements to path/polygon projection and clipping ([179](https://github.com/holoviz/geoviews/pull/179))

=============

Major feature:

- The bokeh backend now supports arbitrary geographic projections, no longer just Web Mercator ([170](https://github.com/holoviz/geoviews/pull/170))

New components:

- Added [``Graph`` element](http://holoviews.org/reference/elements/bokeh/Graph.html) to plot networks of connected nodes ([#115](https://github.com/holoviz/geoviews/pull/115))

- Added [``TriMesh`` element](http://holoviews.org/reference/elements/bokeh/TriMesh.html) and datashading operation to plot small and large irregular triangular meshes ([#115](https://github.com/holoviz/geoviews/pull/115))

- Added [``QuadMesh`` element](http://holoviews.org/reference/elements/bokeh/QuadMesh.html) and datashading operation to plot small and large, irregular rectilinear and curvilinear meshes ([#116](https://github.com/holoviz/geoviews/pull/116))

- Added [``VectorField`` element](http://holoviews.org/reference/elements/bokeh/VectorField.html) and datashading operation to plot small and large quiver plots and other collections of vectors ([#122](https://github.com/holoviz/geoviews/pull/122))

- Added [``HexTiles`` element](http://holoviews.org/reference/elements/bokeh/HexTiles.html) to plot data binned into a hexagonal grid ([#147](https://github.com/holoviz/geoviews/pull/147))

- Added [``Labels`` element](http://holoviews.org/reference/elements/bokeh/Labels.html) to plot a large number of text labels at once (as data rather than as annotations) ([#147](https://github.com/holoviz/geoviews/pull/147))

New features:

- Hover tool now supports displaying geographic coordinates as longitude and latitude ([158](https://github.com/holoviz/geoviews/pull/158))

- Added a new ``geoviews.tile_sources`` module with a predefined set of tile sources ([165](https://github.com/holoviz/geoviews/pull/165))

- Wrapped the xESMF library as a regridding and interpolation operation for rectilinear and curvilinear grids ([127](https://github.com/holoviz/geoviews/pull/127))

- HoloViews operations including ``datashade`` and ``rasterize`` now retain geographic ``crs`` coordinate system ([118](https://github.com/holoviz/geoviews/pull/118))

Enhancements:

- Overhauled documentation and added a gallery ([121](https://github.com/holoviz/geoviews/pull/121))

=============

Enhancements:

- Ensured that HoloViews operations such as datashade, aggregate and regrid do not drop the coordinate reference system on the input element (https://github.com/holoviz/geoviews/pull/118)
- Unified WMTS support across backends, bokeh and matplotlib now support rendering ``{X}_{Y}_{Z}`` based web tiles (https://github.com/holoviz/geoviews/pull/120)
- Handle projecting of empty Elements (https://github.com/holoviz/geoviews/pull/131)
- Set Image element NaN coloring to transparent (https://github.com/holoviz/geoviews/pull/136/commits/f1f29607079f1f86bce56187dd7a98ca2a1d9eff)
- Overhauled website with new theme (https://github.com/holoviz/geoviews/pull/106)

=============

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