Natural Earth in Wagner VII projection
This is a complete database of basemap/reference GIS data in Wagner VII projection, using the Natural Earth 2.0 database reprojected and edited. This is primarily for use in GIS software like QGis, ArcGIS, MapInfo and others, as well as for GIS enabled web applications (GeoServer, ArcGIS Server, MapServer and more).http://www.georeference.org/doc/wagner_vii.htm) and [here](http://www.mapthematics.com/ProjectionsList.php?Projection=188) for more information) represents a good solution. The projection is *equal-area* and has a decent trade-off in shape distortion. One problem with the projection is that it is not supported in some of the common desktop GIS packages, like ArcGIS and QGis, and when it is (like Saga GIS) data sometimes gets distorted in the view/reprojection process. By using 10E as the central meridian one avoids the problem of a far sliver of Russia being split up. The projection definition in WKT is:
PROJCS["Wagner VII, 10E",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS84",6378137,298.257223563]],PRIMEM["10E",10],UNIT["degree",0.0174532925199433]],PROJECTION["Wagner_VII"],PARAMETER["false_easting",0],PARAMETER["false_northing",0]]
The projection file (ArcInfo style .prj) that Global Mapper generates is:
Projection WAGNER VII Datum WGS84 Zunits NO Units METERS Xshift 0.000000 Yshift 0.000000 Parameters 10 0 0.000 /* longitude of center of projection 0.000 /* false easting (meters) 0.000 /* false northing (meters)
To get access to the full database, download the latest of all the data (some 300 MB), or clone this repo using your favorite git tool. If you are using just using the data, please ignore the 'tools' folder.
Source data - Natural Earth 2.0
The data in this database is the vector datasets from the Natural Earth dataset/collection. This collection features essential basemap data for small-scale maps, in multiple levels of detail resolutions (1:10m, 1:50m and 1:110m). The data includes coastlines, country boundaries, lakes and rivers and much more. Natural Earth is a collective effort, headed by Nathaniel Kelso and Tom Patterson, and the data has been released in the public domain.
This collection of data is placed in the public domain, under the unlicense, please refer to LICENSE.md for more information. Please consider giving Hugo Ahlenius, Nordpil and the Natural Earth team credit and recognition as a data source.
Please note that Natural Earth has been seen minor (and some major) revisions since assembling this database... I would still be of use as it is though.
This collection contains most of the data from Natural Earth 2.0, with the following exceptions/notes:
- The raster datasets has not yet been reprojected. This process is reasonably trivial (doesn't require much cleanup)
- The bathymetry isobaths were skipped. Could also be added fairly easily, so far it is the polygons that has caused most trouble
- Graticules for the 1:50m and 1:110m collection were skipped, used the graticules in the 1:10m folder
- The bounding box is new
- The shapefiles for map units in the ocean has a few polygons that needs to be corrected
- The gdb (ESRI ArcGIS file geodatabase) data in Natural Earth 2.0 has not been reprojected
These have been noted as issues in this repository and might get dealt with eventually. Feel free to fork and contribute! Also - the reprojection has been done using Global Mapper 11, there has been notes of slighly different results (offset data) when reprojection using other tools, e.g. proj4, ogr or Saga GIS. Be careful if you need to integrate data from other sources, and review any reprojection. The safest bet is to use Global Mapper when integrating this data. The tools folder in this repository contains a few files/scripts that were used in preparing the data for publishing, and can safely be ignored/skipped!
All the Natural Earth shapefiles were retrived from http://naturalearthdata.com on April 4, 2014 and reprojected in batch using Global Mapper 11. Further data manipulation was performed in ArcGIS 10.2.
- Repair Geometry run on all datasets
- Each layer visually inspected for any inconsistencies
- Reprojection issues manually edited in ArcGIS
- Polygons close to the 170E line
- Polygons around Antarctica
- Clipped to the world bounding box when needed
- Graticules manually added in, where missing (close to the edges)
This work was performed by Hugo Ahlenius, and I am consultant specializing in GIS and cartography, you can read more about me and my services at http://nordpil.com - where you can also find some examples of thematic maps in Wagner VII projection. I wish to extend a warm thanks! to the Natural Earth team for creating such a wonderful resource! Please note anything that can be improved in the data, feel free to contribute, and just let me know if there is anything unclear.