August 11, 2016 / by Open Data Team / In data portal , open data

West Nile Virus Mosquito Test dataset changes

We have made two changes to the West Nile Virus (WNV) Mosquito Test Results dataset:

  • We have added a TRAP_TYPE column.
  • Because addresses are presented at the block level, the LATITUDE, LONGITUDE, and LOCATION columns are designed to be on the correct block but not necessarily at the exact trap location. However, any given trap should appear in the same place for all test records, unless it has actually moved to a different block.  We discovered and fixed an error that was causing the locations to move between tests.  This should only improve the experience for most users but, since most records have moved, anyone sensitive to that sort of change should take note.

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August 11, 2016 / by Open Data Team / In data portal , open data

Filtered views for the Ordinance Violations dataset

We recently released a dataset of ordinance violations related to the Department of Buildings.  However, we will be adding violations from other departments so it is not advisable to use links to the full dataset for purposes that relate only to that department.

We have created a filtered view specifically for Department of Buildings violations.  That view can be treated like a dataset for most purposes and will always stay in sync with the full dataset.  We will be creating similar filtered views for other departments, as we add them. You can find the filtered views for any dataset – as well as other manipulations and presentations of the data – by clicking the purple “More Views” button at the upper-right of the page 

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August 10, 2016 / by Open Data Team / In data portal , open data

Towed Vehicles dataset is not updating

The Towed Vehicles dataset, which normally updates every 15 minutes, has not updated since 10:01 am today.  We are investigating the cause and will post any significant changes – including when the updates resume – as edits to this post.

Services making use of this dataset, such as, will also be affected.  We are not certain but initial indications are that the City of Chicago’s Find Your Vehicle page also has not been updating for towed vehicles since approximately the same time.

Please note that the Relocated Vehicles dataset updates separately and appears to be working properly.

Update 8/10/2016, 12:43 pm - The dataset appears to be updating properly again.  We will continue to monitor but this will be the last update unless the problem returns.

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June 30, 2016 / by Open Data Team / In data portal , open data

Public Chauffeurs data delayed

Due to issues with the data source, the Public Chauffeurs dataset is not showing same-day data.  Updates will occur in the mornings, using data up-to-date through the previous day.

We hope to return to same-day updates sometime in July and will update this post as we have more information.

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June 17, 2016 / by Open Data Team / In data portal , open data

Consolidation of Public Health Clinic Datasets

The Chicago Department of Public Health has historically published three datasets showing the locations, hours, and other information about different clinic types it operates.  Those datasets have been consolidated into a single dataset, with associated map.

Please update any references to the old datasets and maps:

June 02, 2016 / by Open Data Team / In data portal , open data

Missing time slices in beach automated sensor datasets - 6/2/2016

The hourly updates for the Beach Water Quality - Automated Sensors and Beach Weather Stations - Automated Sensors datasets have been failing since 5 am. We are investigating the problem.

Unlike some datasets, the nature of how these datasets are updated means the missing time slices will not be filled in, even after the underlying problem is fixed.

Update 6/2/2016, 2:10 pm - The problem has been fixed and the datasets are updating.

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April 06, 2016 / by Open Data Team / In data portal , open data

Added Ward-Precinct combined field to Business Licenses dataset

Our Business Licenses dataset shows the ward and precinct where the business is located.  Because the same precinct numbers exist in different wards, filtering for a set of precincts in multiple wards has been more complex than necessary.  We have added a new column titled “WARD PRECINCT” to the dataset, which has a combined value.  For example, if you want to filter for businesses in the 1st precinct of the 2nd ward and the 3rd precinct of the 4th ward, you can now set the criteria to 2-1 and 4-3.

This change carries over to the “Current Active” views of the dataset:

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March 03, 2016 / by Open Data Team / In data portal , open data

What coordinate system do our shapefiles use?

We frequently get questions about what coordinate system our shapefile datasets use.  The answer is State Plane Illinois East NAD 1983.

It is important to note that this answer applies to the files we upload – those of view type Files and Documents and “Original” exports of our newer map format.  The “Shapefile” exports are created by the Data Portal software, even if the original file was also a shapefile, and use WGS84.

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February 04, 2016 / by Open Data Team / In data portal , open data

Crimes - 2001 to present dataset is missing records

Due to an error in this morning’s update job, most records in the Crimes - 2001 to present dataset were deleted, leaving only 722 records. We are working on the problem and hope to have a complete dataset by tomorrow morning.

In the meantime, the Crimes - One year prior to present dataset, which shows a trailing year of records, appears to be accurate and can be used as an alternate source for that time period.

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January 07, 2016 / by Open Data Team / In data portal , open data

Datasets are not updating - 1/7/2016

Due to a problem we are investigating, none of our automated dataset updates have run since about 10 pm yesterday.

Update 1/7/2016, 10:50 am - The problem has been fixed and datasets are updating again, although a few may not be updated until tonight’s regularly scheduled runs.

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