Tag Archives: earthquake
You can add data to your map using CSV or text files referenced from URL locations in both the ArcGIS.com map viewer and Explorer Online. An interesting feature of adding data via URL locations is that each time you open your map the data is refreshed from the source. This means that if the CSV or text file has changed, the map will automatically be refreshed with the latest data when opened. Let’s take a closer look at how this works.
First we need to find a handy CSV file that is URL-based and updated regularly. The USGS earthquake latest feeds and data site is a good source for these, and we can find CSV files recording earthquake lat/long, magnitude, and other details that are updated at frequent intervals.
Below we’ve located the CSV file containing earthquakes recorded for the past hour. Earthquakes that have occurred more than an hour ago are dropped from the list, and the latest ones are added. The list is updated every few minutes. Right-click to copy the file location (we’re using Firefox, your browser may show different options):
Bing Maps recently updated their aerials and hybrid basemaps to include post-tsunami imagery for Japan. Esri has also acquired detailed pre-tsunami imagery for several areas from GeoEye that are being used for custom Web apps as part of ongoing disaster response work.
I decided to have a look at these image services and using Explorer Desktop’s swipe tool I was able to compare the before and after imagery.
First, I chose the Bing Maps Aerial basemap from the built-in basemap gallery. This is the service that’s been recently updated by Bing Maps to include the post-tsunami imagery.
Next I connected to the Esri server that is publishing the pre-event GeoEye imagery (this service is not currently public) by choosing Add Content, then choosing GIS Services, then entering the URL path to the service.
Next I made the pre-event imagery service visible, highlighted it in the map contents, clicked the Tools tab, and clicked the Swipe tool:
Using the swipe tool the before and after differences in the devastated areas could be viewed. The “before” imagery is somewhat obviously on the left in the screen captures below (click to view a larger image):
For more information on swipe see the control layer appearance help topic.
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:
Indonesia was hard-hit by an earthquake, tsunami, and volcanic eruption, all occurring within a short timeframe. The earthquake happened on Monday night, and registered 7.7 on the Richter Scale. The subsequent tsunami triggered by the quake flattened several villages and a resort, leaving hundreds dead and many hundreds more still missing. Mount Merapi, one of Indonesia’s most active volcanos, erupted soon after the earthquake killing at least 28 people and coating the region with ash.
The Pacific Disaster Center (PDC) monitors many sources of disaster event information (like NOAA and USGS) and publishes continually updated information in real-time via ArcGIS Server. PDC shares these services via ArcGIS Online, where you can discover and use them to create your own map to take a closer look at these disastrous events.
Start by opening the ArcGIS.com viewer and choose Add. Below we’ve searched ArcGIS Online for “PDC” to discover the available services, choosing PDC Active Hazards to add to our map.
The PDC Active Hazards service includes a collection of dynamically updated information that’s culled from sources in near real-time. These are published as sublayers in the single PDC Active Hazards ArcGIS service. For our map we want to view just two of the sublayers – earthquakes and volcanoes.
To view a subset of all available information in the service, we open the map contents, and click PDC Active Hazards (the service name) to view its sublayers. Below we’ve checked the Active_Volcano and Recent_Earthquake sublayers to view them on our map.
Next we zoom to Indonesia, where the cluster of earthquakes and active Mount Merapi volcano can be seen, and save and share our map publicly via our ArcGIS Online account. There it can be discovered and viewed by visiting ArcGIS.com or using the built-in ArcGIS Online search capabilities in ArcGIS Desktop, ArcGIS Explorer Online, or ArcGIS Explorer Desktop. The map can also be viewed using ArcGIS for iOS, a free application for your iPhone or iPad that you can download from the Apple store.
03/04/10–ESRI recently published an Earthquake Response for Chile group on ArcGIS Online to assist in providing data and other resouces related to the recent earthquake. The content is being published by ESRI and other organizations in support of relief activities.
At the site, a variety of resources can be found, including applications that combine ESRI maps with other types of information, links to services with relevant information, and links to downloadable data and maps.
From the group landing page, click the Contents tab to view shared content. Click on a thumbnail to open the item, or click the title for more information.
Here we opened the detailed description for one of the shared items, a Web map that combines USGS earthquake data with ArcGIS Online basemaps.
Click to open the Web map. Here we used Identify to view additional information from the USGS about each earthquake in the area. The red dots represent quakes greater than 2.5 in magnitude.
By clicking Add More Layers:
We can find additional services to mashup in our application, enabling us to build upon existing maps.
Here we found another service published by the Pacific Disaster Center (PDC) and created a mashup of our original map with the PDC service, selected a new basemap, and reordered the layers in our contents.
For more information visit the ESRI Chile Earthquake Support site.
Here’s a video we found published by GIShistory on YouTube. Produced with ArcGIS Explorer, this animation shows all earthquakes of magnitude 3 or greater in the Southern California area between 1932 and 2008. Data from USGS.
01/15/10–With the recent Haiti earthquake, we had many inquiries from users who want to know where they can find maps, or how they can share their maps and other content. To find maps in ArcGIS Online, type Haiti in the top right search box and click Go.
Below are steps on how you can quickly add your own content, share your content, and create a group in ArcGIS Online to share your content with others.
If you have already registered your ESRI Global account for ArcGIS Online, skip to the section on Adding your content to ArcGIS Online.
Registering your ESRI Global Account for ArcGIS Online
If you haven’t joined ArcGIS Online yet, first you need to register
your ESRI Global Account, then you sign in with your ESRI Global
Account information. If you don’t already have an ESRI Global Account,
you need to create one before you can register it with ArcGIS Online
and sign in.
- Go to ArcGIS Online and click the Sign In link on the upper right.
- Click the register your ESRI Global Account with ArcGIS Online link below the
Sign In button.
- On the registration page, enter your ESRI Global account username and password, and click Register. You will need to sign
up for an ESRI Global Account if you don’t already have one. See Registering for an account in ArcGIS Online Help for detailed steps.
will see your My Content page.
Adding your content to ArcGIS Online
- Make sure you are signed in to ArcGIS Online.
- On the My Content page, click Add Item.
- Fill in the Add Item form and click Add Item.NOTE: If you are adding content specific to Haiti relief activities, include the following in your Tags: Haiti,earthquake.
- Once you add the item, it appears in My Content. Click the item name, then click Edit to upload a thumbnail image; to add a summary, description, and access and use constraints; or to change the item’s title and tags.
For more information on adding and editing your ArcGIS Online content, see Adding items in ArcGIS Online Help.
Sharing your content
You can share your items with everyone (public), or with a group or groups.
- Make sure you are signed in to ArcGIS Online.
- On the My Content page, click to select the checkbox next to the item(s) you want to share and click Share.
- Choose the group(s) you want to share the item(s) with, and click OK.
NOTE: If you want your content added to the Haiti Earthquake group that is published on ArcGIS Online, go to the page for that group and click Join this Group to submit a request to become a member of that group. Once approved, you will have the ability to share content to that group.
For more information on sharing your content, see Sharing your items in ArcGIS Online Help.
Creating a group
You can create a group to share content with other users who have a common interest.
- Make sure you are signed in to ArcGIS Online.
- Click My Groups.
- On the My Groups page, click Create a group .
- On the Group Name page, include a name, summary, description, contact
information, tags, and upload
an image. Tags are important since they determine if your group shows up in the search results when someone enters a keyword that matches one of your tags.
NOTE: If you make your group Public, then anyone will be able to find it through the search function. If you choose to make your group Private, then only users whom you invite will be able to see your group.
- Once you fill in all the information and upload a thumbnail, click Save. You will now see the group on your My Groups page.
For more information on creating groups, see Creating and editing groups in ArcGIS Online Help.
- If you made your group private, you can invite members by clicking your group name, and clicking Invite Users .
- Fill out the Invite Users form. See Inviting people to join a group in ArcGIS Online Help for instructions on filling out the form.
- A notification will be sent to the users you invite. The user(s) will be alerted that they have a pending notification via the Notification link in the top right of ArcGIS Online.
For more information on notifications, see Notifications in ArcGIS Online Help.
If you have questions, please post them to our forum at http://forums.esri.com/forums.asp?c=188.
Contributed by Maria Lomoro of the Product Marketing team for ArcGIS Online
01/13/10–The recent devastating earthquake centered near Port-au-Prince in Haiti has lots of GIS responders scrambling for data and other information. As a quick start, the Bing Maps aerials provide a pre-quake substrate for other data and analysis.
We also found this recently posted Web app by searching for “haiti.”
The application shows the locations of the earthquake and related aftershocks.
Visit ESRI’s disaster response and assistance site to request help and locate other resources or to contact the ESRI Disaster Coordination team.