Category: Cities

How to split a bike lane in two and copy features with QGIS

July 13, 2012 / / 0 Comments

A screenshot of the splash image seen on users with iPad retina displays in landscape mode. 

To make the Chicago Offline Bike Map, I need bikeways data. I got this from the City of Chicago’s data portal, in GIS shapefile format. It has a good attribute table listing the name of the street the bikeway is on and the bikeway’s class (see below). After several bike lanes had been installed, I asked the City’s data portal operators for an updated shapefile. I got it a month later and found that it wasn’t up-to-date. I probably could have received a shapefile with the current bikeway installations marked, but I didn’t have time to wait: every day delayed was one more day I couldn’t promote my app; I make 70 cents per sale.

Since the bikeway lines were already there, I could simply reclassify the sections that had been changed to an upgraded form of bikeway (for example, Wabash Avenue went from a door zone-style bike lane to a buffered bike lane in 2011). I tried to do this but ran into trouble when the line segment was longer than the bikeway segment that needed to be reclassified (for example, Elston Avenue has varying classifications from Milwaukee Avenue to North Avenue that didn’t match the line segments for that street). I had to divide the bikeway into shorter segments and reclassify them individually.

Enter the Split Features tool. QGIS is short on documentation and I had trouble using this feature. I eventually found the trick after a search that took more time than I expected. Here’s how to cut a line:

  1. Select the line using one of the selection tools. I prefer the default one, Select Features, where you have to click on the feature one-by-one. (It’s not required that you select the line, but doing so will ensure you only cut the selected line. If you don’t select the line, you can cut many lines in one go.)
  2. Toggle editing on the layer that contains the line you want to cut.
  3. Click Edit>Split Features to activate that tool, or find its icon in one the toolbars (which may or may not be shown).
  4. Click once near where you want to split the line.
  5. Move the cursor across the line you want to split, in the desired split location.
  6. When the red line indicating your split is where you desire, press the right-click mouse button.

Your line segment has now been split. A new entry has been added to the attribute table. There are now two entries with duplicate attributes representing that together make up the original line segment, before you split it.

This screenshot shows a red line across a road. The red line indicates where the road will be split. Press the right-click mouse button to tell QGIS to “split now”.

After splitting, open the attribute table to see that you now have two features with identical attributes. 

Copying features in QGIS

A second issue I had when creating new bikeways data was when a bikeway didn’t exist and I couldn’t reclassify it. This was the case on Franklin Boulevard: no bikeway had ever been installed there. I solved this problem by copying the relevant street segments from the Transportation (roads) shapefile and pasted them into the bikeways shapefile. New entries were created in the attribute table but with blank attributes. It was simple to fill in the street name, class, and extents.

Chicago bikeways GIS description

Bikeway classes (TYPE in the dataset) in the City of Chicago data portal are:

  1. Existing bike lane
  2. Existing marked shared lane
  3. Proposed on-street bikeway
  4. Recommended bike route
  5. Existing trail
  6. Proposed off-street trail
  7. Access path (to existing trail)
  8. Existing cycle track (also known as protected bike lane)
  9. Existing buffered bike lane

It remains to be seen if the City will identify the “enhanced marked shared lane” on Wells Street between Wacker Drive and Van Buren street differently than “existing marked shared lane” in the data.

I found the Milwaukee Avenue peloton this morning

July 12, 2012 / / 0 Comments

You can spot at least 10 people bicycling southbound on Milwaukee Avenue through Bucktown. 

I work from home and don’t commute downtown like I believe a majority of cycle commuters do. I was bicycling towards the Wicker Park-Bucktown Chamber of Commerce office for an 8:30 AM meeting of the Special Service Area’s transportation committee. We talked about bike racks, street furniture, and the progress of Open Streets. We partnered with Active Transportation Alliance to put that on, September 16, a Sunday and the week after Open Streets on State Street.

Traveling to Portland on July 18 through July 23

July 10, 2012 / / 0 Comments

My favorite photo from my first (and only) trip to Portland, Oregon, in April 2010. 

Things I want to see or do:

  • New Sellwood non-car bridge
  • South Waterfront
  • Bike on a trail outside of town
  • Visit the ocean (this won’t happen as it will take too much of my short time there)
  • Buy a WorkCycles Fr8
  • Any other urban design, urban planning stuff that’s gone in since April 2010
  • Bike in Sunday Parkways
  • Take more photos of curbs

People I want to meet:

  • Jonathan Maus
  • Will Vanlue
  • Travis Wittwer
  • EthanPDX
  • Joel (at Splendid Cycles)
  • Metrofiets people
  • Mia Birk
  • Kelly C. and Jennifer D. at the university
  • Mayor Adams
  • Roger Geller
  • I want to interview some people about Sunday Parkways
  • Toni and Candace from Women and Women First bookstore

Brief history of suburbs and sprawl, according to Taras Grescoe’s “Straphanger”

June 29, 2012 / / 0 Comments

The Metra station in Riverside, Illinois, a version 1.0 streetcar suburb designed by Frederick Law Olmsted and Calvert Vaux. 

I’m reading another book a publisher sent to me. It seems pretty biased, and it’s biased in the direction I already feel, so it’s really easy reading. But it seems that people like me are its only audience and that it assumes I’m already pro-cities, anti-suburbs and maybe even anti-car. Definitely not a book that’s going to espouse the benefits of transit to those who don’t use it, don’t want to use it, or are on the fence for either situation.

If I could get my father or brother to read this book, that would be an accomplishment just short of a miracle.

The book is Straphanger: Saving our cities and ourselves from the automobile, by Taras Grescoe. I really like the section I just finished reading, a “condensed history of sprawl”. I had recently “argued” with my father about the development of the subdivision he lives in, east of Phoenix. He posited that suburbs were the result of consumer desires. Grescoe writes to the contrary. Here we go:

The origin of the Anglo-American suburb has been traced to Clapham, five miles south of London, where, in the 1790s, Evangelical Christians eager to remove their families from the evils of the city began living in what had formerly been their weekend villas, and commuting to the City by private carriage. In the United States, [author Kenneth] Jackson dates the beginning of the process to 1815, when regular steam ferry service to Manhattan made Brooklyn Heights the nation’s first true commuter suburb. (page 89)

American suburb version 1.0

  • When: 1853 onward
  • What it was: picturesque, full of green space, near central cities, attached by rail line
  • Who lived there: As mortgages didn’t exist, only those who could afford to buy a home outright
  • Examples: Llewellyn Park, NJ; Riverside, IL.
  • Note: Ebenezer Howard’s “Garden City” design is related.

American suburb version 2.0

  • When: Post World War II
  • What it was: cheap, small housing on vast land tracts; pre-assembled homes
  • Who lived there: Families with soldiers that expanded quickly so new homes were needed fast.
  • Examples: Levittown, Long Island; Lakewood, Los Angeles.
  • Note: “The prevailing myth”, writes Kenneth Jackson, “is that the postwar suburbs blossomed because of the preference of consumers who made free choices in an open environment. Actually, most postwar families were not free to choose among several residential alternatives. Because of public policies favoring the suburbs, only one possibility was economically feasible”.

American suburb version 3.0

  • When: Late 1980s, 1990s to now
  • What it was: Found near office parks, also known as “edge cities”, “common interest communities” (gated and homeowners associations)
  • Who lived there: Single races (self-segregating), people who lean conservative
  • Examples: Silicon Valley, Nevada, Florida
  • Note: Under the George W. Bush administration, Fannie Mae and Freddie Mac offered easy credit and homeownership rate rose to 69% by 2004. “(By 2012, it is expected to drop to 62%, the lowest level since 1960.)”

American suburb version 4.0

  • When: 2008, easy credit crisis, underwater mortgages
  • What it is: Least glamorous, the clichéd image of the inner city has moved to the suburbs. Arizona has highest rate of property crime. Nevada and Florida, the most suburbanized states, have highest rates of violent crime (Florida also has highest rate of pedestrian and bicycle fatalities).
  • Who lives there: A diverse group of people.
  • Examples: See “What it is”
  • Note: “Humans are social animals. I [Kenneth Jackson] think the biggest fake ever perpetrated is that children like, and need, big yards. What children like are other children. I think we move children to the suburbs to control the children, not to respond to something the children want. In the city, the kids might see somebody urinate in public, but they’re much more at risk in the suburbs, where they tend to die in cars.”

What are those public policies as described in American suburb version 2.0?

The federal government had carrots and sticks. Carrots were subsidies for homeownership (could be deducted from income taxes) and no down payment required for returning soldiers. Sticks included redlining (racial segregation), propagated by the Federal Housing Administration and banks. Zoning was another stick, which dictated what could go where.

Another carrot was the federally-funded highway system, the “greatest public subside to private real estate in the history of the world”.

Pride Parade 2012: Easier on transportation system over last year

June 28, 2012 / / 0 Comments

Bodhi Spiritual Center says, “You are fabulous”. 

After last year’s near-meltown of transportation surrounding post-parade trips, parade organizers, aldermen, and the city redesigns the parade route, to make it longer and eliminate the hard to access “internal triangle” between Halsted and Broadway (with a vertex at Grace/Halsted/Broadway). The meltdown was that thousands of people tried to board at the CTA Belmont Station. The station stopped allowing new passengers 5 times to ease overcrowding. I can’t recall if trains had to skip the station because they were full.

The new design allowed for better access from more CTA train stations, more bus routes, and allowed for more even spectator dispersal along the route (with 6 pedestrian crossings operated by many police officers). The CTA, which is usually very good at communicating service changes, made a webpage dedicated to the Pride Parade and even designed their own map. That and their social media communication stressed the other stations paradeogers should use: Wilson, Sheridan, Addison, and Fullerton. That was in addition to the other bus routes that now had closer access to the changed route.

I wrote about the 2011 transportation experience on Grid Chicago in which I suggested shutting down private vehicle traffic on more streets and further away from the parade route, allowing only buses and bicyclists. I couldn’t tell if that happened this year. Last year I entered the parade “shed” on Belmont and then Addison. All east-west streets it seemed were closed to traffic from Clark Street to Halsted Street (which is a good thing). Clark Street was closed this year for a couple of blocks south of Diversey Avenue (also a good thing).

Chicago Fire Department miniature trucks. 

I didn’t notice these last year, but the fire department utilized ATV-like trucks to transport sick spectators. I didn’t see any Chicago police officers riding ATVs, but I may have read the department abandoned those because of their increased danger on crowds and the officer driving it.

I think the route changes were effective in making for a better (and safer) parade experience. Organizers and the City’s OEMC estimated attendance at 850,000, just 50,000 over last year. Because of the changes and the great weather (it was very breezy), I expected a higher increase. Some people who attended last year may have been turned off by the unease of the crowded viewing experience.