Mobile GIS & LBS
Matt holds an MSc in Geography and GIS. He has been working with clients solving problems with GIS for over 17 years. Matt founded WebMapSolutions whose mission is to put innovative, intuitive GIS driven applications into the hands of new and existing users.
April 22nd, 2013 by Matt Sheehan
We have spent much of the last year focused on ArcGIS Online. Our initial development efforts targeted mobile. Working with the Idaho Transportation Department, we have been building an online/offline mobile editing app. The data itself is part of a hosted feature service in ArcGIS Online. Using these hosted feature services, we have started doing analytic’s in ArcMap 10.1 and building Web apps for office based executives. The demo below shows the mobile, desktop and Web portions of this work.
Contact us for more information.
March 1st, 2013 by Matt Sheehan
Disaster management demands rapid response, and careful coordination of workers in the field. Mobile technology has the potential to provide important tools to first responders to help mitigate the effects of disasters. Working with a county in the state of Michigan, we have been investigating the use is iOS and Android devices in combination with ArcGIS Online to help improve disaster management efforts.
Disaster Management Today Relies on Pen and Paper
Over the last few years there have been an increasing number of tornadoes and floods causing considerable damage in Michigan. An important requirement of many county GIS departments, often with help from the Red Cross, is to quickly record damage and report findings to State authorities to then provide funding and assistance. Field workers are sent out to affected areas with parcel maps. Notes are made parcel by parcel on level of damage, often home owners are interviewed. Once back in the office this data is collated and assembled in a spreadsheet and emailed to the State. This represents a labor intensive effort under considerable time pressure.
The Use of Mobile Apps for Disaster Management
Mobile technology in combination with the cloud, have the potential to dramatically improve the efficiency and reduce the effort required in managing disasters. We were asked to investigate the use of tablets as disaster management tools; a mobile ArcGIS Online app which uses both onboard GPS and camera, to collect and report levels of damage. The app needed to work in both connected and disconnected modes.
Disaster Management Mobile App Set Up
We’ve been building a mobile app framework which provides both online and offline functionality. We took this framework and adapted it for the disaster management requirements.
Figure 1: Base Map Layer Package Source in ArcMap 10.1
Our first step was to open ArcMap 10.1 and generate two base map sources:
1) A tile package or TPK for the offline basemap
Figure 2: Tile Package Generation in ArcMap 10.1 for Offline BaseMap
2) A tiled base layer based on a layer package (.lpk file) for an online base map.
Figure 3: ArcGIS Online Hosted Tiled Service Publishing from ArcMap 10.1 for Online BaseMap
Next we published an editable hosted feature service in ArcGIS Online. In our case we made some edits to the attributes of the shapefile and added two field (damage level, and comments) before publishing.
Figure 4: ArcGIS Online Hosted Feature Service Preparation & Publishing from ArcMap 10.1
In each case above the data needed to be in a Web Mercator projection which is the default for ArcGIS Online. Another point worth mention is that ArcGIS Online at present only supports 1000 features, so shapefiles with more than this number of features cannot be published as hosted feature services. We will revisit this topic in due course.
The hosted feature service needs setting up as we describe in the following blog post >a href=”http://www.webmapsolutions.com/hosted-feature-layers-arcgis-online”>http://www.webmapsolutions.com/hosted-feature-layers-arcgis-online
Now our interest is only editing certain attributes. Though we do wish to see all attributes in non-edit mode, when in edit mode it would be nice to only list these editable fields. In ArcGIS Online when we view the hosted feature service, we can open the ‘Configure Pop Ups’ option and set only those attributes we wish to edit as visible. Perfect. But alas not, this filter only applies in the web interface and not what is passed to the mobile app.
Figure 5: ArcGIS Online Hosted Feature Service Configure Pop Ups
After successfully publishing and configuring the services, we then combined the published tiled basemap and hosted feature service as a single web map.
Figure 6: ArcGIS Online Web Map
Offline ArcGIS Online Editing
So good, to summarise we have publshed three services to ArcGIS Online:
1) Hosted Tiled basemap
Next it is time to think about offline. The tpk we generated earlier is in essence a zip file. We need to copy this to the mobile tablet. In the case of Android this is a drag and drop copy operation. For iOS it is done through iTunes. Next we set the configuration file. Given the general theme of this, as with all our mobile work, is to build a mobile app which:
1) Provides focused functionality – here connected/disconnected editing
The configuration file is a key element, providing maximum flexibility.
Figure 7: ArcGIS Online Mobile App Configuration File
This file, like the tpk, is copied to the device. And is read each time the application loads.
Connected Disconnected ArcGIS Online Editing Demo
Connected Disconnected ArcGIS Online Editing Thoughts
The 1000 feature limit in ArcGIS Online hosted feature service we mentioned earlier is both a problem and solution for this application. A problem since we often have source geodata containing many more than 1000 features. But we will never need more than 1000 features visible at any one time to edit, plus more than 1000 feature layer features will degrade the performance of the mobile application; zoom and pan will become increasingly more challenging. So what is our best compromise? In this case id we have more 1000 features and an ArcGIS server instance, we publish the full dataset to server, BUT only publish a subset of this data in ArcGIS Online. This subset would be the extent of the data published, so the area and features being edited that day or by that group of field workers.
Mobile ArcGIS Online Editing Conclusion
There are many potential applications of this technology in disaster management and assessment. Mobile apps such a the one described will prove important to local and state governments, the insurance industry and other key sectors and organisations. For more information about our work in this area contact us at firstname.lastname@example.org.
February 7th, 2013 by Matt Sheehan
We always like a good challenge. More than once in the last few weeks we have been asked if it is possible to auto generate features – points, lines, polygons – on a mobile device using GPS. So store the path followed using the built in mobile GPS. Then generate a feature from this data. We put our thinking caps on and came up the application you see in the video below
The demo shows the app running on an Android tablet in offline mode. This could just as easily have been an iPad; since we built the app using Mobile Flex which can run on either platform. We first generated a tile package in ArcMap, this forms the offline basemap and is stored on the tablet. Checkboxes in the top left header allow users to select either polygon or line as the final generated feature. Start and stop buttons initiate data collection, and generate the final feature respectively. In the demo we drove around a block; starting and finishing at the same point, so we chose to generate a polygon.
January 28th, 2013 by Matt Sheehan
We’ve spent some time on this blog discussing ArcGIS Online. As we have said, we see this new mapping platform as a major step forward. But detailed discussion of the advantages misses the most central point; ArcGIS Online brings simplicity. Users, organisations, developers all will benefit. We thought is worthwhile discussing areas we see ArcGIS Online simplifying:
Organizing, Administering and Sharing Geo-Data with ArcGIS Online within Organizations
1) Groups and users – Online offers a slew of ways to organise data into groups, and share with a specific group of users. If your data is confidential, then host Online behind your firewall.
2) Data Conversion – We are often approached with questions around mobile apps which allow both access to and editing of shapefiles. Sure it can be done, but there is much time and effort needed to achieve, what we often think is a less than perfect solution. With ArcGIS Online shapefiles are converted to interactive feature layers. If these are generated as hosted feature layers, editing is now possible.
January 17th, 2013 by Matt Sheehan
Wanted to follow up on a recent post we wrote on hosted Web apps for ArcGIS Online.
December 31st, 2012 by Matt Sheehan