LA Cleanliness Index More Effective Than Philadelphia’s Litter Index

Philadelphia has been using a litter index to assess street trash conditions since 2007 (link). Here is the most recent litter index, downloaded from OpenDataPhilly.  The actual dates for the litter survey data is not provided.

phl_litter_index_fall_2016

Philadelphia’s Litter Index provides a 1-4 composite score for 111 trash collection day area in the City. The City’s meta data file states:

The Litter Index is used to compare the relative cleanliness of different areas of the city of Philadelphia. he relative cleanliness of different areas of the city of Philadelphia.

Originally created in 2007, the Litter Index is used to compare the relative cleanliness of different areas of the city. The Litter Index is scored on a 1-4 scale with 1 being minimal litter and 4 being extremely littered.

The City’s Litter Index has a number of shortcomings which limit its usefulness as a City trash hot spot identification and management tool.

  • Data collection is based on relatively large areas, with an average of 2.2 square miles. Seriously trash street segments are masked when the data is averaged over such a large area.
  • Street Litter Index Values for specific areas vary widely from survey to survey, raising concerns about the reliability of the underlying methodology (link).
  • There is no relationship between 311 Illegal Dumping Service Requests and Street Litter Index.

phl_litter_index_311_il_dmp_sr

Los Angeles has developed a Street Cleanliness Index (link) which provides detailed street segment by segment data not available in Philadelphia’s index.

Here is a short video describing how LA used a dashcam, smartphone camera and ArcGIS to score each street segment in LA.

LA  uses assigns a  1 to 3 cleanliness score for Loose Litter, Illegal Dumping, Weeds and Bulky Items as well as a composite score.  Here is an example of the LA Cleanliness Score Map , showing segments with Clean, Somewhat Clean and Not Clean scores.

la_map_snippet

With the LA method, the Not Clean (red) segments standout.  Philadelphia needs to adopt a detailed street litter index score system like LA so that we can pinpoint the badly trash street segments and begin getting our trash problems under control.

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