John J Czaplewski jczaplew

Same as http://bl.ocks.org/jczaplew/6603431 but using Canvas instead of SVG. Seems to be faster in some browsers, but still remains unusably slow in mobile browsers. For full code see https://github.com/jczaplew/d3-acmp-lite

Display global views using a Hammer projection with d3.js, everything else in a web mercator with Leaflet.js.

Edit: now with additional smoke and mirrors.

A simple example showing how to detect a double tap with d3.js, and an accompanying method for reusability.

GeoJSON plates render correctly, whereas the TopoJSON plates do not. The plate that wraps the north pole is inverted, covering all of the oceans.

In contrast to the other example (http://bl.ocks.org/jczaplew/7204160), this example uses the same data, but with all latitudes in the GeoJSON file flipped before converting to TopoJSON. This results in the GeoJSON rendering incorrectly, but the TopoJSON rendering correctly.

A modular D3.js-based geologic time scale that utilizes data from the Paleobiology Database. The repo can be found here.

These three maps demonstrate that under some conditions, the winding order of large polygons that wrap the poles is incorrectly guessed by D3. Converting to Topojson (topojson -o plates.topojson -p --no-stitch-poles -- plates.geojson) forces a consistent winding order (see https://github.com/mbostock/d3/wiki/Geo-Paths#wiki-_path), but in this case does not fix the problem.

It is also important to note that this error only throws an error in Chrome Canary and simply does not draw the problematic polygon, whereas in every other browser (Chrome Stable, Firefox, Safari) no error is thrown to the console and the problematic polygon is draw with the wrong winding order.

Heroku + Github + Sensitive Data

Scenario: You deployed a Heroku project that contains sensitive data (password, API key, etc) but you want to share it on Github.

Problem: You need to commit all files necessary for the application to run on Heroku. However, pushing this to Github would reveal the sensitive info.

Solution: Have a production branch (for this example, master will be the production branch) and a Github branch. The latter contains a different .gitignore that ignores the sensitive files.

	#! I need this for my broken version of Postgres.app
	#!export DYLD_LIBRARY_PATH=/Applications/Postgres.app/Contents/MacOS/lib/

	for i in *.shp; do
	shp2pgsql -s 4326 $i \| psql -h localhost -U you -d database
	done

	'''
	A simple tool for exporting from a PostGIS table to GeoJSON and TopoJSON. Assumes Python 2.7+,
	psycopg2, and TopoJSON are already installed and in your PATH.

	Adapted from Bryan McBride's PHP implementation
	(https://gist.github.com/bmcbride/1913855/)
	by John Czaplewski \| [email protected] \| @JJCzaplewski

	TODO:
	- Add argument for SRS