By Aileen Buckley, Mapping Center Lead
Some of you may find this news of interest…the USGS historical topographic quadrangles are being made available in the Map Locator application at the USGS Store website (http://store.usgs.gov/), for viewing/downloading in GeoPDF format (a print-on-demand can also be ordered). They will be posted in the same order that the new product U.S. topos are being made available, so the first state for which they are available is Kansas. These historical quad scans include every version of a USGS topographic quadrangle map that was printed, including reprints where no changes were made to the interior of the map. Here is where you can find details on this project: http://nationalmap.gov/historical/index.html.
Note that we also blogged about this in an earlier entry: USGS Historical Quadrangle Scanning Project.
The Hydrography Event Management (HEM) Tool Version 2.4 for ArcGIS 10 is now available!
The HEM Tool provides full functionality for adding and editing events in the National Hydrography Dataset (NHD).
Events are informational data linked to the NHD using a linear
referencing system on NHDFlowlines. The use of events allows vast
amounts of scientific information to be linked to the NHD.
The HEM tool handles all linear referencing mechanics to make working with events easy. It works on point, line, and area events and allows events to be located interactively, imported, or calculated.
A number of state and federal partners have adopted HEM: Environmental Protection Agency (EPA) incorporated HEM to meet Clean Water Act reporting requirements, the U.S. Forest Service incorporated HEM functionality into their National Resource Information System (NRIS) Aquatic Surveys application, Bureau of Land Management (BLM) incorporated HEM to support event creation for its Oregon/Washington Aquatic Resource Information Management System
and is evaluating its use for a national Riparian Database, and the HEM
Tool is used to georeference water quality data to the NHD, and this
information is then used for Section 303(d) water quality reports on impaired waters.
HEM effort is a unique collaboration between the BLM, U.S. Geological
Survey (USGS), and the EPA that results in ongoing tool development and
support to the expanding HEM user community.
The USGS provides basic to advanced HEM training with easy to follow exercises:
and additional user support in the Troubleshooting Guide.
To find out more information visit USGS’s HEM site.
Special thanks to Ariel Bates for providing the post. Questions for Ariel: email@example.com
Earlier this evening I saw this tweet from the USGS about a recent swarm of earthquakes in Arkansas:
Checking out a few tweets this evening I noticed this one from the USGS:
I followed the tweeted link to more details about the recent earthquake swarm in Arkansas, and went to the data and feeds page to make my own map. I made my first map by opening the KML file in ArcGIS Explorer Desktop, shown below.
The great thing about opening the KML in Explorer vs. Google Earth is that I could choose from many different basemaps, or combine other ArcGIS Online services like population density (shown below) to see how many folks were close by. From the population density l discovered that the population density near the quake cluster is very low.
I also used the buffer tool (found in the Analysis Gallery)
to create several radii to see how far away the smaller quakes were to the largest quake, a 4.0 shown in red. I created 3, 4, and 5 mile rings and discovered that most of the swarm was within 4 miles of the epicenter of the largest quake.
Since I wanted to keep an eye on the swarm, I decided to add the GeoRSS feed which is dynamic, and continually updated. To add the feed I clicked Add Content and chose GIS Services:
Then chose GeoRSS as the service type:
And entered the URL I found at the USGS website for the feed:
Next I chose the update interval, and since I wanted to view the latest earthquakes each time I opened the map, I toggled the second option. I could also have set the update to refresh periodically. Below is the GeoRSS feed shown in my map.
For more information check out these help topics:
12/30/09–Earlier this morning several of us sitting in our offices felt the roll of an earthquake – where could it be? Visiting the USGS Natural Hazards Support System site we quickly learned that the quake we felt was located in Baja California, measuring in at hefty 5.8 with a number of aftershocks, one measuring 4.9.
Yesterday nearly 5 million Californians living near the San Andreas fault participated in an earthquake disaster preparedness drill called the ShakeOut, which we mentioned in our post yesterday. The earthquake scenario included a 7.8-magnitude earthquake along a 190-mile stretch of the fault starting at the Salton Sea and stretching northwest.
To understand the demographics of the most impacted areas in the scenario, we opened the USGS earthquake simulation shake intensity map (published as a KML) and added it to Explorer. Here’s the view of the quake intensity map looking north along the southern California Coast. The red areas are the areas with the highest predicted intensity.
We used the Business Reports task (powered by ESRI’s Business Analyst Online), available on the Explorer Resource Center, to delineate the boundary around the highest intensity areas. We used that boundary to generate the report, shown here:
The graphic demographic profile is the one we chose, and there are many different kinds of reports to choose from (some are free, some require a subscription). The report showed that over 6 million households are located in the high intensity area, roughly evenly distributed by age and income, with %50 of the owner occupied homes having a value greater than $400,000, and %40 having a value of greater than $500,000.