May 2015
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Interactive Snowpack Map

Thanks to Mike Carson for passing this along:

eGIS Committee Meeting Agenda for May 2015

Please find the agenda for tomorrow’s meeting attached here: eGIS meeting notice and Agenda – May 2015

See you tomorrow!

Forum – LARIAC Data for a Resilient LA Region

larc_flyerLoyola Marymount is hosting a forum for the Los Angeles Regional Collaborative for Climate Action and Sustainability – this one is focused on the use of LARIAC data for resiliency and sustainability.  The event is free and open to the public.

Click here to view the flyer: LARC 3rd Month Forum at LMU CURes

Click here to RSVP

MapStory and Story Maps

Many of us are familiar with Esri Story Maps, and hopefully, many of us will visit exhibits and workshops about them at the upcoming Esri User Conference in July. Story Maps are a great way to add a “where” dimension to telling our story, or to just help explain something to someone. (It’s not too late to enter Esri’s Storytelling Contest, with winners to be announced at the Conference.)

While Esri Story Maps provide self-guided interactive presentations for the user, has been likened to the “YouTube of geospatial temporal data”. Here, maps have Play buttons.

With initial development beginning in 2011, was launched in early 2013 by the MapStory Foundation as a community project, inspired by Wikipedia and completely built on open source software. One example shows the growth of the City of Los Angeles. Unknown to us, within weeks after our countywide city annexation data was first uploaded to the Los Angeles County GIS Data Portal, someone from New York City created this animated map. The same author later created a more elaborate animation showing the evolution of all of L. A. County’s cities, including several cities that are now extinct.

With a free MapStory account, all it takes is a shapefile containing dates to create a story layer.

Interactive Map of Fatal Collisions (2003 – 2012)

I wanted to play a bit more with both Leaflet, which is an open source Javascript library for mapping.  A recent dataset that we downloaded from UC Berkeley contains all injury collisions in LA County from 2003 – 2012.  Mapping the locations of fatal collisions would let me play with some of the cool features of leaflet, namely hotspot mapping, as well as referencing ESRI leaflet specific capabilities.

So on the map below you can see different types of fatalities (pedestrian, bike, vehicle, or all).  I just put an IFrame around the actual web page:

Note that the way leaflet works, data is downloaded to your computer and rendered locally – so it will take a while to stream the data down initially.

Update to Preferred GIS Technologies

LA County has released an update to our preferred technologies for GIS, which recognizes the value, increasing adoption rates, and power of Leaflet (, which is an open source Javascript Library for mobile-friendly apps, along with the related data structure, geoJSON (  As well, this update recognizes the use of Socrata for the LA County Data Portal

We have also created a new page specific for our Preferred Technologies:

For some examples of these in action, see this page: – these applications work very well for mobile devices.

LA County Open Data Portal goes live

opendataThis morning LA County launched its Open Data Portal at  Beyond GIS data, the data portal expands the scope of our open data efforts to non-GIS data, including budget and finance information.

Developer tools and Open APIs enable developers to leverage the data as a service, and to build applications against this data.

We have loaded some of the GIS datasets that we make available on our GIS Data Portal ( onto this new portal, but for now will continue to maintain the GIS Data Portal in parrallel.

Historic Maps of Los Angeles

Mike Carson at SoCalGIS posted about Earthworks recently – so I took a quick look.

Interestingly, I found a scanned, georeferenced map of downtown LA (the first survey of the city) – I had seen the original at a recent Geospatial LA tour of the LA Central Library – I had thought it would be interesting to scan and georeference these maps, and they are already there!

So – for those of you who might want to see the older maps, take a loot.  Here is a link to a search for the LA Area:

I requested a download of that map, so it should be interesting to see what arrives!

eGIS Committee Meeting Agenda – April 2015

Please find tomorrow’s agenda attached.  Note that there is now a second page which lists the presentations by department.  I have added it since the departments scheduled for tomorrow did not remember they were on the agenda, so they were not prepared.  Please review.

eGIS meeting notice and Agenda – April 2015


Chrome removes support for Silverlight – LA County GIS Viewers impacted

If you use Chrome to access some of the County’s GIS applications (the GIS Viewer and the Parcel Viewer, for example), and those applications are based on Silverlight, you won’t be able to access them without making a settings change.  Note – Internet Explorer and Mozilla Firefox will work just fine.

Why?  Chrome is disabling support for NPAPI – see this post here:

You can re-enable NPAPI by doing the following:

  1. Open Chrome
  2. Go to: http://chrome://flags
  3. Enable NPAPI
  4. Force Exit Chrome (Ctrl+Shift+Q)
  5. Restart Chrome

However – Chrome will finish deprecation and remove ALL support in September of this year.  The County is moving to an HTML5 JAvascript platform over the next few months, but after that, to access the Silverlight applications you will need to use IE or Firefox