Map of number and age of buildings in Cleveland by census tract. Future plans include employement, income, and foreclosure data, etc.
Make sure that ogr2 and TopoJSON are installed properly, see "Let's make a map!" (http://bost.ocks.org/mike/map/) for further instructions
tl_2013_39_tract.shp (via http://catalog.data.gov/dataset/tiger-line-shapefile-2013-state-ohio-current-census-tract-state-based)
cleveland_housing_age.csv (for city of Cleveland, data taken by census tract from http://neocando.case.edu/cando/index.jsp?page=)
Take the census tract data for Cuyahoga County, ID 035
ogr2ogr -f GeoJSON -where "COUNTYFP = '035'" input35.json tl_2013_39_tract.shp
Add attributes to the GeoJSON file, mapping the id property from the shapefile (originally) to the column title in the csv file
topojson \
-o output35.json \
-e cleveland_housing_age.csv \
--id-property=+NAME,+CensusTract \
-p since05=+Since05 \
-p 00to05=+00to05 \
-p 90to99=+90to99 \
-p 80to89=+80to89 \
-p 70to79=+70to79 \
-p 60to69=+60to69 \
-p 50to59=+50to59 \
-p 40to49=+40to49 \
-p pre40=+Pre40 \
--input35.json Note: delete tract 9900, as it represents the lake itself and does not contain useful information (to the best of my knowledge).