Category Archives: QGIS

A New Version of QGIS v2.14 Has Been Released!

Currently a new version of QGIS is released every four months!  To help users deal with this rapid development pace, the version put out each spring is designated as a long-term release (LTR). This means it will be supported for one calendar year. After that, new stable versions continue to be posted quarterly and any bug fixes associated with those quarterly versions are applied to the LTR. The LTR is recommended for production environments. It has a slower release cycle, and receives regular bug fixes throughout the year. Monday February 29th QGIS 2.14, the next LTR was released. It is nicknamed ‘Essen’ after the town in Germany where a recent developer meeting was held.

essen

QGIS Essen

Essen has a lot of new features. You can visit the Visual Changelog to read about all the new features in detail. You can also see who developed and sponsored each new feature. Community Health Mappers might be especially interested in these new features:

  • the new 2.5 D renderer which allows you to extrude features into space.
With25DandTreesShaddow-832x400

Example of 2.5 D Rendering by Nicholas Duggan @ XYHT.com

  • improved labeling
  • better control over map elements in the Print Composer
  • an improved Processing Toolbox
  • the new widget you get by right clicking on a layer in the Layers Panel and choosing Style. It allows you to change the color for a symbol without having to open a single dialog box!
2016-03-02_151603

Style Widget

If you are using QGIS you should visit the download page and install the latest version! Note that the Mac installer takes a little longer to assemble and may not be available for several more days.

Happy GIS’ing!

Community Health Mapping: A New Year Review

To start the New Year I thought I’d begin with a review of Community Health Mapping (CHM). There are a lot of new project partners, and I thought it would be a good time to give a project overview. CHM is a collaborative effort between the National Library of MedicineCenter for Public Service Communications and Bird’s Eye View. The National Library of Medicine is funding the initiative.

The overall goal is to empower community organizations serving vulnerable or underserved populations with low cost, intuitive mapping technology. Therefore we’ve been working with programs organizations who:

  • Focus on vulnerable populations
  • Frequently use and collect data
  • Need effective, scalable & easy to use mapping tools
  • Lack resources (i.e., for proprietary GIS training & software)

We have identified a suite of tools that allow you to collect custom field data, analyze that data, combine it with other spatial datasets, and generate both static maps and/or dynamic maps on the internet. This allows organizations to collect and work with their own data, and if appropriate, share it with others. CHM involves three components that meet all basic mapping needs:

  • Field Data Collection
  • Desktop Analysis and Cartography
  • Internet Mapping
Community Health Mapping Workflow

Community Health Mapping Workflow

A given project may not require all three, however, collectively these components address the basic needs of all mapping projects.

Field Data Collection:

Rather than focusing on the use of expensive GPS receivers, we recommend the use of smart phones and tablets for these reasons:

  • Most community-based organizations already have them!
  • Many know how to use them
  • They’re intuitive
  • They’re portable
  • They come with an on board GPS receiver (iPhone 5 uses GPS + GLONASS)
  • Have on board cameras
  • Can connect to wireless networks
  • Access to the internet
  • Email is available
  • “There’s an app for that!”
SmartPhones and Tablets vs. Traditional GPS Receivers

SmartPhones and Tablets vs. Traditional GPS Receivers

Of course an important consideration is horizontal accuracy. You can read our blog post on that topic to see if mobile smart devices meet your project needs.

When collecting data you need to be able to develop your own custom data collection form. The top three mobile apps we have found are:

Desktop Analysis and Cartography:

After community field data collection, the next step typically involves bringing the data into a desktop GIS. This is the middle step in the workflow. Here the data can be viewed against basemaps such as Google or OpenStreetMap, and combined with other organizational data. This is also where analyses (proximity, density etc.) can be conducted. Presentation quality maps can also be generated in this step.

The software we found to be the best fit is QGIS. This is an open source desktop GIS software. It has many strengths:

  • It can consume many kinds of data, including all the data that would come out of the field data collection apps.
  • It is both intuitive and robust.
  • It has a large suite of geoprocessing tools for analyzing data.
  • It will run on Windows, Mac, or Linux.
  • It is free to download and install.
  • It is well documented.
  • There is a large user community.
  • New functionality is being continuously added. New stable versions are being released every 4 months!
Baltimore Diabetes Data in QGIS Desktop

Baltimore Diabetes Data in QGIS Desktop

Web Presentation

Often you may want to present an interactive map of your results. Interactive means the map reader can zoom in/out, pan the map and turn layers off and on. For this we recommend CartoDB.

You can sign up for a free account, which gives you 50Mb of storage space. Data can be collected with a smart phone or tablet and brought directly into CartoDB.  It is a very intuitive platform. You can literally drag and drop a spreadsheet onto the CartoDB page and have the data upload to your account.  It will accept the most common geospatial file formats including: spreadsheets and comma delimited text files with addresses or coordinates, KML/KMZ, GPX, and shapefiles.

CartoDB also has great documentation including:

Baltimore Diabetes Data in CartoDB

Baltimore Diabetes Data in CartoDB

In Conclusion

This blog has a lot of resources including reviews of mapping technology and case studies. You might begin by clicking on some of the links in this entry. We are also working on a 6 lab CHM curriculum that interested parties will be able to use to hone their skills. Stay tuned for that!

We are always looking for new partners and continuously work to support current project partners. If you are interested, or have questions please don’t hesitate to contact John Scott (jscott at cpsc.com) or Kurt Menke (kurt at birdseyeviewgis.com). Most importantly get out and do some mapping in 2016!

 

 

 

Wildly Successful Community Health Mapping Workshops at MUSC!

Community Health Maps (CHM) conducted it’s largest and most successful workshops ever at the end of September at the Medical University of South Carolina (MUSC). The training at MUSC was divided into three workshops and a presentation. The attendees were a mix of professors, students and researchers, most of whom had little to no experience with GIS. Despite this fact, nearly everyone was able to collect data and make a map. This is a testament to the easy to use nature of the CHM workflow.

It began Monday morning with the first workshop. This was an Intermediate Session for those Community Health Mappers who had been working on projects since the April CHM workshop. We spent two hours covering more advanced topics and answering project specific questions.

Kurt Menke explaining advanced QGIS features.

Kurt Menke explaining advanced QGIS features.

Following that, Kurt Menke presented a CHM project overview at a brown bag lunch session to 30 attendees. Matt Jones closed this session with a 10 minute talk detailing how he used The Community Health Maps workflow this summer to map access to care on Johns Island.

The second workshop was Monday afternoon. It was a two hour session covering field data collection with iForm, and mapping that data online with CartoDB. There were 55 attendees at this session, the vast majority of whom had no GIS experience. In just two hours all 55 attendees were able to collect field data and make a map in CartoDB!

iForm and CartoDB Workshop Attendees

iForm and CartoDB Workshop Attendees

The final workshop on Tuesday was a 5 hour session covering the use of QGIS. The workshop consisted of a custom Charleston based QGIS exercise. Each of the 35 participants worked with a set of Charleston GIS data while learning the basic layout of QGIS. They learned how to add data, style it, and compose a map. The workshop ended with a discussion of each participants goals and project specific questions.

QGIS Workshop Attendees

QGIS Workshop Attendees

In total almost 80 people attended one or more sections of the training! Thanks go out to Dr. Deborah Williamson for hosting the workshops, Dana Burshell for organizing the entire event and assisting during the workshops, and to Sarah Reynolds who was invaluable in providing Mac and QGIS support!

QGIS 2.8.1 Released

Today the next stable version of QGIS was released. It is being called QGIS version 2.8 ‘Wien‘. Wien is German for ‘Vienna‘ which was the host city for the QGIS developer meetings in 2009 and 2014.

QGIS2.8_splash

QGIS 2.8 Splash Page

Recently a new version of QGIS has been released every four months. This rapid pace of development has its pros and cons. On the plus side, the software is rapidly growing and improving. On the con side it has made it difficult to maintain documentation. It has also been an issue for people working on large projects. They have had to deal with the software changing every four months.

QGIS 2.8 is a special release because it is the first in a series of long-term releases (LTR’s). The idea is that one release per year will be an LTR. This means that the LTR release will be supported and available for download for one year. This way people needing stability can use this until the next LTR is released a year from now.

Some of the highlights are:

  • Numerous bug fixes and stability improvements
  • QGIS Browser is more responsive
  • Ability to select the units in the Measure tool
  • Improvements to editing: better control of snapping and a new suite of Advanced Digitizing tools
  • Improvements to the Map Composer such as better control over coordinate graticules and map rotation.
  • Symbology improvements such as filling polygons with raster images, ability to have multiple styles per layer.

The detailed list of new features can be found here: http://www2.qgis.org/en/site/forusers/visualchangelog28/index.html

Visit the download page and take the new version for a spin. Remember you can install it on Windows, Mac and Linux!

 

Community Health Maps Conducts a Training in the South Carolina Lowcountry

Recently Kurt Menke headed to Charleston, South Carolina to train several groups how to map their communities. This region is also known as the ‘lowcountry’ due to the flat, low elevation geography. The training was hosted by the Medical University of South Carolina (MUSC) and included people from Communities in Schools – Charleston (CISC) and the MUSC College of Nursing.

MUSC Community Health Mapping Training Session

MUSC Community Health Mapping Training at the School of Nursing

First everyone learned how collect GPS field data with iPads. For this we used a new app named iForm. This app was used in lieu of EPI Collect, which no longer supported on iOS. (The next blog post will cover iForm in more detail.) iForm is an app very similar to the Android app ODK Collect, allowing a custom data collection form to be developed. To practice we collected bike rack locations  and seating areas around the MUSC campus. The afternoon was spent working with everyone’s  data. GPS data points were brought into QGIS and shown against some local Charleston GIS data layers.

MUSC Data Points in QGIS

MUSC Data Points in QGIS

The points were also uploaded to CartoDB. CartoDB is another new component of the Community Health Mapping workflow. It has become more intuitive than GIS Cloud and worked really well. (Note: There will be a post on using CartoDB soon too.)

The following day I visited CISC’s Derek Toth and three of his students at St. John’s High School on John’s Island, SC. Over a working lunch Mr. Toth showed students how easy it is to collect GPS points with their iPhones. We collecting several points while walking around the campus.

IMG_5459

Mapping the St. Johns Campus

Afterwards we went back inside and showed them how to upload the points into CartoDB and make a map. The figure below shows the results of 45 minutes worth of work! Click on the map to open the live version.

St Johns High School Map

St Johns High School Data Points in CartoDB

This spring these three juniors will be leading the charge to map their island!  They will be presenting their work to the National Library of Medicine later this spring. I look forward to seeing their work!

St. Johns High School Mapping Team

The St. Johns High School Mapping Team from left to right: Jocelyn Basturto, Khatana Simmons, Candace Moorer (MUSC), Corrieonna Roper & Derek Toth (CISC)


Noise Pollution and Health in the Urban Environment: A Pilot Project

In October 2013, the Seattle Indian Health Board’s (SIHB’s) Urban Indian Health Institute (UIHI) completed a noise pollution pilot study. The goals of this project were: 1) to evaluate the feasibility of community data collection and analysis via a low cost GPS/GIS workflow, and 2) to offer recommendations on the feasibility and next steps for scalability to the larger Urban Indian Health Organization (UIHO) network. The collected data could additionally illustrate community health needs when merged with health or other contextual data for analysis, but these analyses were not the primary focus of this pilot. We chose to look at noise pollution because it is an environmental health concern that has been linked to a variety of health conditions in both occupational and community studies and it is easy to measure with portable devices.

For field data collection, we used an iPad Mini with the GISPro and Decibel 10th apps. For mapping and spatial analysis, we used the open source desktop GIS software QGIS (www.qgis.org). While GISPro is a paid iPad app, the other programs are free. Data collection participants were staff recruited from the SIHB’s administrative, clinical and UIHI departments. We selected participants from this pool because they are representative of the staff at UIHOs who likely have limited experience with data collection and GIS. UIHI project staff trained seven participants in the iPad workflow and data collection process. This workflow consisted of five steps: 1) collect noise data with Decibel 10th, 2) export noise data via email, 3) take a site picture, 4) collect GIS data with GISPro and 5) export that GIS data.

Select pictures of data collection sites, taken by study participants using an iPad Mini; Seattle, WA

Select pictures of data collection sites, taken by study participants using an iPad Mini; Seattle, WA

When the volunteer participants were finished with data collection, project staff compiled and analyzed the data using QGIS and Stata. Data were merged with socioeconomic indicators from the American Community Survey by zip code. Participating staff were asked for their feedback about their experience and the usability of the tools.

Average decibel reading at the 17 data collection sites and per capita income of zip codes, location of the Seattle Indian Health Board indicated by yellow star; Seattle, WA; October 2013

Average decibel reading at the 17 data collection sites and per capita income of zip codes, location of the Seattle Indian Health Board indicated by yellow star; Seattle, WA; October 2013

That feedback, combined with the experience of project staff, suggested that the GIS software tools were user-friendly and highly effective. Thus, they are likely to be attractive to organizations with limited technology budgets. However, some of the other resources necessary for this project (i.e. the GISPro mapping app, the iPad and general GIS software expertise) are expensive and may be limitations for many UIHOs. In the future, the UIHI would like to use these tools to better understand the health of the community, as well as assist UIHOs in conducting similar projects in their service area.

For more information about this project, view the project brief at http://www.uihi.org/wp-content/uploads/2014/08/GIS-Project-Brief_20140604.pdf.

The UIHI is a division of the SIHB and is one of 12 Indian Health Service tribal epidemiology centers (TECs). Unlike the other TECs that focus on geography-specific tribal populations, the UIHI is national in scope, focusing on American Indians and Alaska Natives (AI/ANs) living in urban areas. The UIHI supports the efforts of Urban Indian Health Organizations (UIHOs) nationally, as they serve the health and social support needs of their urban AI/AN communities.

The Center for Public Service Communications and the National Library of Medicine provided funding for the UIHI to complete this project.

Map and Analyze Field Data with QGIS

After community field data collection, the next step typically involves bringing the data into a desktop GIS. This is the middle step in the workflow outlined in the Introduction. Here the data can be viewed against basemaps such as Google or OpenStreetMap, and combined with other organizational data. This is where analyses can be conducted. Presentation quality maps can also be generated in this step.

The software we found to be the best fit is QGIS. This is an open source desktop GIS software. It has many strengths:

  • It can consume many kinds of data, including all the data that would come out of the field data collection apps.
  • It is both intuitive and robust.
  • It has a large suite of geoprocessing tools for analyzing data.
  • It will run on Windows, Mac, or Linux.
  • It is free to download and install.
  • It is well documented.
  • There is a large user community.
  • New functionality is being continuously added. New stable versions are being released every 4 months!

 QGIS Browser:

QGIS has two main applications: QGIS Browser and QGIS Desktop. Browser allows you to preview your GIS data. It is similar to Windows Explorer, or Mac Finder, but is designed to work with GIS data. It has a File Tree, a main Display Window, Database Connections and Display Tabs (See figure below). It allows you to view basic information about a GIS layer and preview both the spatial features and the attributes. Data can be dragged and dropped from QGIS Browser to QGIS Desktop.

QGIS Browser

QGIS Browser

QGIS Desktop:

Desktop is the program for conducting analyses and making maps. It comes with tools for editing and manipulating GIS data. The main interface is similar to well known proprietary GIS packages with a Table of Contents along the left side. This shows your data layers and the symbol applied to them. The majority of the space is taken up with the Map Window (See figure below). Buttons along the left side allow you to add data to a map. Buttons along the top allow you to pan and zoom into the map. There are additional editing and data analysis tools available from menus.

QGIS Desktop

QGIS Desktop

With QGIS Desktop you can perform analyses such as calculating distances to resources, characterizing communities with socioeconomic data from the U.S. Census (NOTE: you will need to obtain data from the U.S. Census to do this), or generate new data like density surfaces.  The sky is the limit.

QGIS Desktop also comes with a Print Composer (See figure below). This opens in a separate window and allows you to craft a publication quality map. Common map elements such as a title, legend, scale bar, north arrow, logos, and text can be added. The final map can be exported in a variety of common image formats such as: jpg, png or tif. Maps can also be exported as pdf’s. If you want to do additional design work in a program like InkScape or Adobe Illustrator the maps can also be exported as svg files.

QGIS Print Composer

QGIS Print Composer

Resources:

While fairly intuitive, GIS work can still be rather complicated and full of jargon. There is a learning curve involved. To help with this we have resources that explain how to install QGIS and bring in data from the three recommended field data collection apps.

For more complete GIS training with QGIS there is the newly created FOSS4G Academy. This is a five course curriculum teaching GIS principles via QGIS. The material is available for free here: http://foss4geo.org/. The courses include:

  • GST 101 – Introduction to Geospatial Technology
  • GST 102 – Spatial Analysis
  • GST 103 – Data Acquisition and Management
  • GST 104 – Cartography
  • GST 105 – Remote Sensing

QGIS also comes with thorough documentation.

Download it today and try it out!