Wondering how the boundary of Los Angeles County looked like in 1851? Here you go:
Here it is in 1887, just before Orange County was created the year after:
The Atlas of Historical County Boundaries allows you to explore how county boundaries have shifted throughout history. You can also download GIS shapefiles of polygons for each different configuration of a state’s counties or the entire United States, coded by date. Check it out!
The California Geologic Survey (CGS) Seismic Hazards Program has significantly updated two versions of its regulatory hazard zone map products. First, all GIS data files (in ESRI Shapefile format) for fault rupture, liquefaction and earthquake-induced landslide zones have been re-projected to California (Teale) Albers, in meters, with a North American Datum 1983. In addition, all GIS zone polygons now include attributes that provide the name of the 7.5-minute quadrangle, map release date(s), and links to zone reports and PDF maps. Active fault traces within earthquake fault zones have attributes for fault name and fault type. Continue reading
The Interdisciplinary Earth Data Alliance (IEDA) data facility aims to, “support, sustain, and advance the geosciences by providing data services for observational geoscience data from the ocean, earth, and polar sciences.” The IEDA, which is funded by the US National Science Foundation, is headed by staff at Columbia University’s Lamont-Doherty Earth Observatory. On this website, you will find a number of data repositories and data syntheses, which are collections of data sets with a shared area of investigation. Data repositories include information in the fields of Antarctic science, marine geology and geophysics, and geochronology. You can also download the free GeoMapApp, which is a free software tool for creating data visualization. Check it out!
Whether you are an ArcGIS Online subscriber or an ArcGIS Hub user, you can launch an open data site in 3 steps, which include configuring and designing the site and making it public. Check out ESRI’s post about it here.
The Los Angeles County Assessor has just released their 2016 tax roll parcels. The 2016 parcels (in a file geodatabase) with associated tax roll information can be downloaded at the Los Angeles County GIS Data Portal.
A newly discovered print of Martin Waldseemüller’s 1507 map was to be sold at auction this month until experts raised concerns about its authenticity. The Waldseemüller map is considered to be the first to mention America. Click below for the story and how it was discovered to be a fake.
See how a data enthusiast takes commuter data from the US Census American Community Survey and plots where people live and work to visualize commuting trends. Click below to read about how it was done.
Click below to try out the app and select a state and county to visualize the data.
ESRI has released AppStudio 2.1 for ArcGIS. The release includes new features like material design layouts, community panel, updated templates, app framework plugins, biometric authentication, and interapp communication. Read on for more info!
Huell Howser was an American television personality best known for hosting, producing, and writing California’s Gold, a human interest show that aired on California PBS stations. He would explore natural wonders, historic landmarks, and quirky destinations in California.
Before he passed away in 2013, he donated his videotaped collection of California’s Gold episodes and others to Chapman University. The school established the Huell Howser Archives which offers the public free access to the entire digitized collection of his life’s work!
And yes, there is a story map! Just click on a location to get episode info and a link to the video to watch. As Huell would say … That’s Amazing!
UPDATE 5/3/2024: After many years, the wonderful app below is no longer working. Apparently it was created by a GIS consulting company that was not related to Chapman University and now they have gone out of business.
If you missed your favorite workshop at the 2017 ESRI UC in July, there are 51 of them that you can watch online. From ArcGIS Enterprise to ArcGIS Pro to ArcGIS Online, there is something there that might interest you. Check them out!
SoCalGIS.org 