osm – Andrew Harvey's Blog

Andrew Harvey's Blog · andrewharvey4.wordpress.com · English

Software Developer, Mapper, Free Culture/Software Supporter, Recreational Cyclist

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Last post: Oct 9, 2012
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A free and open source SRTM shaded relief and contour map
Oct 9, 2012 · original
I’ve recently pushed out a new srtm3-stylesheets repository which contains shell scripts for working with NASA SRTM DEM data, gdaldem based stylesheets for shaded relief maps, Mapnik stylesheets for contours and a TileStache configuration for sandwich those styles together into a single map. This was spurred on by the fact that I simply needed a map which showed hills. I’ve used Andy Allan’s OpenCycleMap in the past which has color relief and contours. Unfortunately it is closed source. So I put my head down and hacked together repeatable scripts to get the source data up and running and some basic stylesheets to produce a usable and pleasant looking map. All released as free and open source software under the CC0 license. I want to avoid adding things like streets etc, such maps could be built as separated layers based upon this style and sandwiched together, for example, with the TileS
Development Update (Static OSM Tiles, git rebase, Map Labelling)
Dec 11, 2011 · original
Map Labelling Suburbs and Cities Yesterday I pushed a bunch of changes to my OSM/Aerial Imagery Hybrid Style , see the (demo) . I spent a bit of time on suburb and city labels as they are a really important feature of a map aimed at non-experts. I’m finding making a non-trivial style like this has defiantly made me realise the difficulties of such a task. There are a lot of improvements that can be made (either by modifying or making new components) to the OSM Mapping conventions, osm2pgsql/imposm, mapnik library, carto language stack. That said, the current form is still great and you can still make great maps. But, I would like to be able to but this needs have labels for large bays at lower zooms than small bays need bays mapped as closed ways covering their area, rather than a point in the centre define a linear function for the size of icons. i.e. at z10 the icon is 10px, at z20 the
OSMT
Oct 9, 2011 · original
I feel the map style I’ve been working on recently is in good enough shape to announce. It is written in carto and designed to be used with OpenStreetMap data. It is an overlay layer for aerial imagery, though in my example I use NearMap imagery. Take a look at http://tianjara.net/osmt.html . The source is at https://github.com/andrewharvey/osm-hybrid-carto/ , licensed CC-BY-SA. There is still lots of work to do on it though. I also have a lightweight cycle-overlay too (view example at http://tianjara.net/leaflet.html and tick on the cycle overlay or view the code at https://gist.github.com/1216315 )
All Roads Lead to Packaging for Debian
Sep 12, 2011 · original
Just a quick update to say that I have exhausted all my options to build a latest .osm file from fosm.org minute-replicate osc files + a base .osm file from osm.org. Currently fosm.org is down, but I still want to edit on top of the latest data so I can submit my changesets when it comes back online. This is proving to be more difficult that I thought. Although really it is a good thing as even though I’ve tried to ensure I have everything I need to rebuild fosm.org if it were to go down for good, I’m still not 100% sure as I haven’t tried, well now I get to try. My first method was to use osmconvert with the aid of the workflow given in https://github.com/rrankin/osmconvert/blob/e1fbb7319f92f338e0023d110a3098f5a979fd64/update_osm.sh . It was quite fast and it almost worked, but due to limitation of osmconvert it seems that it expects the objects to be sorted in the order given by the ob
Using TileMill to make OpenStreetMap Map Stylesheets
Jun 6, 2011 · original
A short time ago TileMill got support for PostGIS data sources. I’m really excited by this as it means you can use TileMill, which is very easy to use, having a gentle learning curve, to construct your own OpenStreetMap stylesheets and see the data being rendered using your style. This is great! e.g. in less than an hour I made this, Map data © OpenStreetMap contributors, CC-BY-SA Want a map which just shows the drainage network (which you can see from low zooms)? Easy. Map data © OpenStreetMap contributors, CC-BY-SA I’m sure I’ll be publishing lots of new styles in the near future, one of which will be a style designed as an aerial image (NearMap) overlay. Exciting times ahead…
Using ABS ASGS Data in OpenStreetMap
Mar 17, 2011 · original
A little while ago Marcus Blake from the Australian Bureau of Statistics asked the OSM community about the potential use of some ABS data. As I mentioned on the list I think it is good that at least some government departments are making their data available under free licenses and that they engage with with the community to sort out any technical details about the data. As described by the ABS , the ASGS is essentially data describing geographical areas. ASGS ABS Structures - CC-BY 2.5 AU Australian Bureau of Statistics ASGS Non-ABS Structures - CC-BY 2.5 AU Australian Bureau of Statistics Working out which if any structures should be incorporated into OSM and how needs careful consideration, and I’ve posted some of my thoughts to the list . In the mean time, since the data does contain some landuse information I’ve been looking into how best to use this information to aid in mapping. A
Using XSLT to Transform XML data into OSM format
Feb 14, 2011 · original
For a while I used to think that all there was to XML was blah attribute=”value”inner/blah, but of course there is much more. I’m now digging into the real stuff like XPath, XSLT and XML Schemas. I’ve come across a data set of bus stops (as well as live info on where buses are, and their status). The bus stop data set ( http://nswbusdata.info/ptipslivedata/getptipslivedata?filename=stopdescriptions.zip , no longer active so I’m hosting my original copies at http://tianjara.net/data/nsw-buses/ for preservation) is in an XML format, ?xml version="1.0" encoding="UTF-8" standalone="yes"? StopDescriptionList license="http://creativecommons.org/licenses/by-nc-nd/3.0/au/" copyright="NSW Roads and Traffic Authority" stop longitude="151.17832" latitude="-33.81852" tsndescription="Osborne Rd nr Ronald Av" TSN="206699"/ stop longitude="151.17359" latitude="-33.8082" tsndescription="Ralston St nr Mu
OSM user history heatmap
Jan 16, 2011 · original
In the past few months I’ve been contributing to the OpenStreetMap database. From the day I started I’ve had privacy concerns on my mind. If a criminal goes around committing crimes, leaving behind a signature and always travelling x km from home to commit the crime, you get a nice circle around their home. So I’m interested to see what kind of pattern I’m leaving behind. Someone else has probably got an existing solution out there, but I decided to experiment and put together something myself. I already had all my osmChange files (i.e. the ones from http://www.openstreetmap.org/api/0.6/changeset/$ {changeset_id}/download). I pull these daily from http://api.openstreetmap.org/api/0.6/changesets?display_name=aharvey find the changeset ids and download the osmChange files for all my new changesets. I do this as I try to keep a local copy of things I upload into the cloud, as a backup in ca
Old Maps Online
Nov 28, 2010 · original
I should have made a post about this a while ago, but I didn’t want a half complete post, and the scope of my project kept expanding! Part 1: Scraping I found two huge repositories of old digitised maps of Australia, many of which are in the public domain. The National Library of Australia and Parish Maps from the Department of Lands NSW . Unfortunately they didn’t really have a nice documented RESTfull API for the use of the images and metadata. My first step was to extract as much information as I could and convert it into an intermediate format. Most of my code and documentation for doing this is at https://github.com/andrewharvey/govscrape in those two respective folders. Unfortunately it’s not as easy as running one command from my repo to download and parse all the data. My goal was to get the data to my machine, not write a robust system that anyone could run to get a clone of the
Slippy Map Tilenames For Non-North [Isometric] Web Maps
Nov 28, 2010 · original
I made this image to help my understand a slippy map tile naming system for maps that don’t always point North (it turns out nothing changes in terms of the tile numbering, you just have to apply additional view space transformations). This is how Nearmap does it, and when I get around to putting up http://osm.kyblsoft.cz/3dmapa/ like tiles of Sydney I will endeavor to use the same system (in other words you put your code to view the other views in your map viewer application, rather than just change the tile numbering so that you can use existing code for all the views). It doesn’t really change anything here if we have square or non-square tiles, the tile numbers and true coordinates don’t change because of this. Keep in mind that all the points of tile z/y/x for any of these views will be the geographic location, the views just have a different view space translation. Diagram CC BY-SA

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