Category Archives: QGIS

Mapping Curb Ramp Accessibility around a Silver Spring, MD Assisted Living Facility

Submitted by Jenny Rewolinski, University of Maryland, B.S. Community Health 2016

I just completed a spring internship with the National Library of Medicine (NLM). My goal was to demonstrate what a typical user of the Community Health Maps (CHM) blog might experience, while using the low cost resources it reviews to develop a mapping project with a public health focus. I read through the case studies on the CHM blog and used its labs to develop my project plan and to guide my related decisions.

Because of my experience with elderly relatives and my background in public health, I centered my project on how the senior population of a nearby Assisted Living Facility might safely navigate local sidewalks. According to the 2014 American Community Survey, 23% of people over 65 have some sort ambulatory disability. With this in mind, I decided to map local curb ramps –sloped transitions between sidewalks and streets which function as accessibility enhancements to help those with mobility issues to cross streets safely.

JennyDataCollection

Figure 1. Curb Ramp Data Collection using the iForm app

I used CHM Lab 1: Field Data Collection to learn how to design my own data collection form using iForm. My Curb Ramp form captured curb ramp location, conditions, and other observations such as seniors using the curb ramps, steep or damaged curb ramps, and a lack of sidewalks in the area. As discussed in a prior blog post, How Accurate is the GPS on my Smart Phone?, phone geolocation is usually accurate up to 8 meters. This was not precise enough for my curb ramp data, so I corrected for this on my form.  Over the course of 8 hours spanning 2 days, and with 2 other interns I collected 103 existing curb ramps and locations where curb ramps might aid accessibility.

iFormCurbRampForm

Figure 2. iForm Curb Ramp Data Collection Form

Next, I brought my iForm curb ramp data from my phone into the QGIS software by using instructions from CHM Lab 2: Bringing Field Data into QGIS.  I also used CHM Labs 3: Combining Field Data with Other Organizational Data and CHM Lab 4: Basic Spatial Analysis  to add data layers and to perform spatial analysis to finalize my map.

Map

Figure 3. Curb Ramp Accessibility of Senior Population of Silver Spring Assisted Living Center Map

This is my project map! I completed construction of my map using CHM Lab 5: Cartography with QGIS. In addition to my curb ramp data points, I added data layers for sidewalks, roads, places of interest (such as grocery stores, restaurants, bus stops,  theaters), and my Assisted Living Facility. My goal was to raise awareness of how accessibility can impact seniors’ sense of autonomy and empowerment, and their ability to exercise and to lead a healthier lifestyle. This map also provides recommendations for where more curb ramps should be placed based on observations during data collection. I plan to discuss this map and curb ramp recommendations with the city of Silver Spring and to create “safest route” guides for popular local destinations.

SafestRoute

Figure 4. A Safest Route Guide example showing safe and dangerous routes based on location of curb ramps and sidewalks

GIS has a huge potential to help us analyze health issues. When I began my project at NLM, I thought I would simply be mapping the location of curb ramps near a local Assisted Living Facility; however I discovered the significant need for more curb ramps as well as sidewalks around my project area.

I believe the conclusions I was able to reach by using the low cost CHM resources CHM are accurate and workable. I came to NLM with little to no GIS knowledge yet I learned from the CHM GIS labs, collected curb ramp data points and created a map that may bring awareness to a public health issue. In doing so I believe my experience is typical of many CHM users.

If I can do it, you can too!

Discover QGIS – A new QGIS workbook!

Two years ago, myself and several colleagues authored the GeoAcademy which is the first ever GIS curriculum based on a national standard – the U.S. Department of Labor’s Geospatial Competency Model (GTCM). The GTCM consists of the knowledge, skills and abilities needed to be a working GIS professional.  Our team was honored with the 2015 GeoForAll Educator of the Year award for this effort. The GeoAcademy consists of 5 complete college courses.

  • Introduction to Geospatial Technology Using QGIS
  • Spatial Analysis Using QGIS
  • Data Acquisition and Management Using QGIS
  • Cartography Using QGIS and InkScape
  • Remote Sensing Using QGIS and GRASS

This winter I converted the curriculum to fit into a convenient workbook format with Locate Press. The workbook is called Discover QGIS.

As you may be aware, QGIS is evolving rapidly. A new version is released every 4 months!  Due to this rapid development pace each spring a long-term release (LTR) is created. The LTR version is supported for a calendar year and is better for production environments. Originally written for QGIS 2.4, the GeoAcademy material in this workbook has been updated for use with QGIS 2.14 LTR. It therefore represents the most up-to-date version of the GeoAcademy curriculum. In addition to working with QGIS, it also includes exercises doing analysis tasks with the powerful GRASS GIS software, both alone and via the GRASS QGIS plugin. The cartography section includes exercises with InkScape. Here you’ll learn how to begin a map in QGIS and use InkScape to finish a publication quality map.

At the moment the digital version of the workbook is available as a Preview Edition for only $24.99. Purchasing this preview entitles you to the full version when it is released. There are just a few formatting issues to resolve.

This book will be a great resource for Community Health Mappers wanting to build their skills. The 470 page workbook comes with exercise data, challenge exercises and solution files!

Discover QGIS

Discover QGIS

APTR: Teaching Prevention – Albuquerque, NM

Community Health Mappers had a strong presence at the recent APTR Teaching Prevention conference held in Albuquerque, New Mexico last week.

APTR Teaching Prevention Conference Logo

APTR Teaching Prevention Conference Logo

The theme of the conference was Preparing Students to Address Emerging Issues, and four students presented work incorporating the CHM mapping protocol. Medical University of South Carolina (MUSC) College of Nursing students Caitlin Baker and Carleigh Fox presented a  poster on their project “A Diabetes Epidemic in Rural South Carolina.” They used mobile devices to conduct a windshield survey of a rural South Carolina community to better understand the diabetes epidemic.

Caitlin Baker and Carleigh Fox Presenting at the APTR Poster Session

Caitlin Baker and Carleigh Fox (MUSC) Presenting at the APTR Poster Session

Amy Tseng, a student at the University of Washington’s School of Public Health, presented a poster outlining her project, “Evaluating of the Wellness for Asian Pacific Americans Using GIS.” This is her capstone project in the Community Oriented Public Health Practice program . One question she is attempting to answer is whether there is a relationship between having a sense of community and the density of Asian Pacific Americans  in a given neighborhood. She is utilizing QGIS and Fulcrum to help answer this question.

Amy Tseng (UW) Presenting at the APTR Poster Session

Amy Tseng (UW) Presenting at the APTR Poster Session

Christina Yantsides, also in the School of Public Health at the University of Washington, presented her capstone project, “Bicycle Injuries and Fatalities: A GIS Mapping Project” in both a the Sunday afternoon lightning session, and the Sunday evening poster session. She is using QGIS to help identify clusters of bicycle accidents in Seattle and gain a better understanding of the causal factors.

Christina Yantsides (UW) Presenting at the APTR Poster Session

Christina Yantsides (UW) Presenting at the APTR Poster Session

The final morning of the conference myself, John Scott, Dr.  Deborah Williamson (MUSC) and Dana Burshell (MUSC) presented the “National Library of Medicine (NLM) Community Health Mapping Project.” Often conference attendees are tired by the final morning. However, we were excited to present to a standing room only crowd of about 75 attendees! Collectively we introduced the project and the National Library of Medicine, and went on to show how successfully the project has been implemented from Hawai’i to South Carolina. I heard several audible gasps from the audience as we presented examples. This caused me reflect on the fact that mapping and GIS is simply what I do all day long, however, to many it is still a new and exciting tool. We finished with a quick live demo of downloading data from Fulcrum and uploading it into CartoDB to show how quick and easy it is.

John Scott, Deborah Williamson, Kurt Menke and Dana Burshell Before Presenting at APTR

John Scott, Deborah Williamson, Kurt Menke and Dana Burshell Before Presenting at APTR

Collectively it was a very successful demonstration of how Community Health Mapping can be used by community organizations, educators and students. APTR was a very interesting conference and a great fit for Community Health Mapping. Several conference organizers suggested we teach a Community Health Mapping workshop at next years conference! Looks like we will be back!

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Amy Tseng, Sarah Reynolds, Kurt Menke, John Scott, Deborah Williamson, Dana Burshell and Christina Yantsides at APTR

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.
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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!
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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!