├── OSMaccessibility.qgz
├── README.md
├── accessibility_footpaths.model3
├── images
├── accessibility_footpaths_model.png
├── modPart_extract.png
├── modPart_layers.png
├── modPart_newField.png
├── modPart_query.png
├── modPart_style.png
└── screenshot.png
├── parking_disabled.model3
├── presetPeba.zip
├── presetPebaTest.zip
└── styles
├── archetto_w.svg
├── bollard.svg
├── bollard_w.svg
├── crossings.qml
├── foot-path.qml
├── kerb.svg
├── kerb_w.svg
├── kerbs.qml
├── obstacles.qml
├── parkSp_disabled_areaCentroid.qml
├── parkSp_disabled_point.qml
├── transport_parking_disabled.svg
├── warning.svg
└── warning_w.svg
/OSMaccessibility.qgz:
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https://raw.githubusercontent.com/alesarrett/PEBAmap/9b04e0a1c21ec766bc328f271715acc5807f8981/OSMaccessibility.qgz
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/README.md:
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1 | # PEBAmap
2 |
3 | Tools to create a map of urban accessibility using OpenStreetMap data and QGIS.
4 |
5 | 
6 | _Fig. 1: Screenshot of the QGIS interface with modules in use._
7 |
8 | ## Objective
9 |
10 | The purpuse is to provide users with a workflow to:
11 | * query and extract from OpenstreetMap features related to footpaths;
12 | * apply some algorithms to classify features in relation to accessibility for disabled people;
13 | * apply symbols and styles;
14 | * create a map of urban accessibility.
15 |
16 | ## Content of the repository
17 |
18 | This repository contains:
19 | * one QGIS project ([OSMaccessibility.qgz](OSMaccessibility.qgz)) to be used to test the tools
20 | * 2 QGIS processing models to extract and style elements related to footpaths ([accessibility_footpaths.model3](accessibility_footpaths.model3)) and parking spaces for disable people ([parking_disabled.model3](parking_disabled.model3)).
21 | * a folder ([styles](styles)) containing some .qml files and a few symbols for styiling features in QGIS.
22 |
23 | ## QGIS processing modules
24 |
25 | Some of the steps and blocks used in these models are directly inspired by the _osm_download_style.model3_ example provided in the QuickOSM QGIS plugin github repository: https://github.com/3liz/QuickOSM/tree/master/resources/model
26 |
27 | ### Accessibility of footways and paths
28 |
29 | 
30 | _Fig. 2: Overview of the accessibility_footpaths module._
31 |
32 |
33 | This module ([accessibility_footpaths.model3](accessibility_footpaths.model3)) performs the following main steps:
34 | 1. downloads footpaths and pedestrian areas from OpenStreetMap;
35 | 2. creates 3 layers: one for each geometric primitive: points, lines, polygons;
36 | 3. adds new columns containing a classification of accessibility based on combination of OSM tags;
37 | 4. extracts selected features, namely crossings and footpaths from linear features and kerbs and obstacles from point features;
38 | 5. uploads the 5 correspondent layers to the QGIS interface;
39 | 6. applies specific styles to the layers.
40 |
41 | For each of the steps, some more details are described in the following sections.
42 |
43 | #### 1. Download data from OpenStreetMap
44 |
45 | 
46 |
47 | The block _Build raw query_ uses a functionality of the QGIS [_QuickOSM plugin_](https://github.com/3liz/QuickOSM) to query the OSM database through [Overpass API](https://wiki.openstreetmap.org/wiki/Overpass_API) and to extract only a subset of selected information:
48 | * footways
49 | * paths
50 | * pedestrian areas
51 | * parking spaces for disabled people
52 |
53 | The query corresponds to the following Overpass XML:
54 | ```XML
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