Creating service area in QGIS - Revision history

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Mellabe: /* Introduction */

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Introduction

Mellabe: /* References */

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References

Mellabe: /* Conclusion */

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Conclusion

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Introduction

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Conclusion

Mellabe: /* Finalized Service Areas */

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Finalized Service Areas

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Finalized Service Areas

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Finalized Service Areas

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Finalized Service Areas

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 == '''Introduction''' ==
-Network analysis is
+In this tutorial we will be creating service areas for parks in Ottawa using two different tools. The tools we will be comparing are the QGIS network analysis tool and the Valhalla plugin these both do similar things while using different methods to create an output. Service areas can be useful to determine accessibility to an establishment and can help determine which areas are not currently able to attend the establishment within a reasonable amount of time or within in a reasonable distance. For this tutorial we will create a service area for a 10 minute walk from parks and service areas for a 5, 10 and 15 minute walk from parks in Ottawa. These times were picked as parks are most often attended by children in the surrounding area and more then a fifteen minute walk one way would likely be outside of the neighbourhood. The output from this tutorial could easily be used to determine areas in need of a park or a layer to a multi-criteria analysis determining areas in need of a park
-In this tutorial we will be
+From this tutorial you will learn how to input data into QIS, set projections, edit files, set symbology, download plugins, use QGIS network analyst to create service areas, and use Valhalla toolbox to create service areas.
-From this tutorial you will learn
 == '''Data''' ==

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 == References ==
-Valhalla website - https://valhalla.readthedocs.io/en/latest/valhalla-intro/
+Valhalla website - https://valhalla.readthedocs.io/en/latest/valhalla-intro/<br>
-GIS OPS Valhalla post - https://gis-ops.com/valhalla-qgis-plugin/#Valhalla-QGIS-Plugin
+GIS OPS Valhalla post - https://gis-ops.com/valhalla-qgis-plugin/#Valhalla-QGIS-Plugin<br>
 GIS COURSE: QGIS network analyst capabilities - https://www.giscourse.com/qgis-network-analysis-capabilities/

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 Comapring 2serviceareas.PNG | Valhalla 10 minute service areas (orange) and QGIS network analyst 10 minute service areas (red)
 </gallery>
+== References ==
+Valhalla website - https://valhalla.readthedocs.io/en/latest/valhalla-intro/
+GIS OPS Valhalla post - https://gis-ops.com/valhalla-qgis-plugin/#Valhalla-QGIS-Plugin
+GIS COURSE: QGIS network analyst capabilities - https://www.giscourse.com/qgis-network-analysis-capabilities/

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 == '''Introduction''' ==
 Network analysis is
+In this tutorial we will be
-When using QGIS there are many ways to do Network analysis between different plugins and QGIS tools. In this tutorial we will be looking at two different tools, one from a plugin and one already in QGIS, to create service areas of parks within the city of Ottawa. These two tools use very different approaches to preform network analysis which we will be exploring during this tutorial.
 From this tutorial you will learn

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 == '''Conclusion''' ==
+In looking at the two outputs from these tools it can be seen that the service areas created using the Valhalla tool are slightly larger than the ones made using the QGIS tool. While both of these tools successfully created an out put of service areas Valhalla did allow for more customizations and reliability with its network. While the QGIS tool could only create service area lines for one distance and some customization which more leaned towards being helpful for if you were creating service areas for driving. <br>
+The capabilities of the QGIS tool heavily relies on how good the network you've input is. In this case we used a road network and though we removed roads that definitely would not be walkable there may still be some road that realistically a person could not walk and we are still missing pedestrian paths that may have provided some faster routes. The QGIS tool also does not currently allow you to make intervals of the service areas and does not currently create isochrones (areas after connecting point for the same distance) but only creates lines. Well options are limited in this QGIS tool it runs well with no bugs and could definitely still be useful for network analysis. <br>
+The Valhalla plugin allowed lots of options for network analysis including several different tools for pedestrians, bicycles and automobile to take into considerations different paths each mode of transportation would use and different costs they may experience ex. stoping at stop signs for cars, Biking up steep elevation) which can provide a more realistic output. The Valhalla tool does have some small bug like if set to find the fastest route it is able to create an output of isochrones set for time intervals and for distance intervals but will give both the units minutes as talked about earlier in the tutorial. It is possible there are other small bugs like this in the other tools within the Valhalla plugin. This tool provided a great output with many opportunities to add a variety of parameters while creating your desired output and is straight forward and easy to use. Though it has some small bugs it still work very well for the desired output of this tutorial.
 <gallery>
+QGISdissolved symbology.PNG | QGIS network analyst tool 10 minute park service areas
-Comapring 2serviceareas.PNG
+Dissolved symbology.PNG | Valhalla 5, 10, 15 minute park service areas
+Comapring 2serviceareas.PNG | Valhalla 10 minute service areas (orange) and QGIS network analyst 10 minute service areas (red)
 </gallery>
-comparing out puts from both tools
-strengths and weaknesses from both tools
-uses for these tools and their outputs

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 In the finalized service areas you have created all touching polygons should now be dissolved into one another and look like the image below.
 <gallery>
-QGISdissolved symbology.PNG |Caption1
+QGISdissolved symbology.PNG |10 minute walk service areas for Ottawa parks
 </gallery>

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 <gallery>
-Dissolved symbology.PNG (file) | 5, 10, 15 minute walk service areas for Ottawa parks
+Dissolved symbology.PNG| 5, 10, 15 minute walk service areas for Ottawa parks
 </gallery>