August 6, 2014
by chris
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I have produced a new generalized coastline data set you can download and also put together a new update of my coastline data quality analysis. The main news is: The generalized coastlines are now – at least for the moment … Continue reading
March 11, 2014
by chris
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The generalized coastline data sets have been updated and i also wrote an update to my Openstreetmap coastline quality report. This contains a new visualization of the coastline node age showing were the coastline has been modified most recently: Overall … Continue reading
October 12, 2013
by chris
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One difficulty of creating the Franz Josef Land map (see the previous post for the details) has been the constant change of the glaciers and ice caps that cover most of the islands. Like elsewhere in the Arctic glaciers are … Continue reading
September 24, 2013
by chris
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There are essentially two established and broadly used methods of mapping things in Openstreetmap: With GPS or by tracing aerial or satellite images. In the early days GPS was by far the most important method but with the availability of … Continue reading
August 19, 2013
by chris
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The shapefiles with generalized coastlines have now been updated, as previously in web mercator projection for zoom levels one to eight under CC-BY-SA license: download generalized coastlines
August 16, 2013
by chris
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In April I wrote in detail about the quality of the Openstreetmap coastline data. I have now produced an update to that with new analysis maps that also include the new Antarctica data and a list of other larger coastline … Continue reading
April 7, 2013
by chris
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Having worked quite a bit with the Openstreetmap coastline data i have concluded some time ago that the quality of this data is quite good but i have not given any proof for this assertion. The recent import of new … Continue reading
March 11, 2013
by chris
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I updated the demonstration map with generalized lakes as well as views in polar stereographic projection in north and south. Also included are some improvements in relief rendering and in the map display in the browser. Like the coastline the … Continue reading
March 1, 2013
by chris
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Last weekend i have been interviewed for the German OSM Podcast together with Jochen on the Antarctica project. The chat is mostly about the difficulties of mapping a remote location, map projections, the data sources and the special issues of … Continue reading
February 20, 2013
by chris
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Peter Selinger has released a new version of potrace which contains a new backend I have written to generate GeoJSON output. This simplifies use of potrace for geographic applications which previously required to convert from eps or dxf files. I … Continue reading