Thematic Mapping using GrassGIS - Revision history

Smitch: /* Data Identification */

2017-11-28T17:37:33Z

Data Identification

Smitch: /* Software */

2017-11-28T17:36:33Z

Software

Elenilatsis: /* Conclusion */

2017-10-20T16:57:38Z

Conclusion

Elenilatsis: /* Introduction */

2017-10-20T16:56:27Z

Introduction

Elenilatsis: /* Purpose */

2017-10-20T16:55:04Z

Purpose

Elenilatsis: /* Creating the Final Maps */

2017-10-20T15:15:41Z

Creating the Final Maps

Elenilatsis: /* Creating the Final Maps */

2017-10-20T15:14:27Z

Creating the Final Maps

Elenilatsis: /* Creating the Final Maps */

2017-10-20T15:10:44Z

Creating the Final Maps

Elenilatsis: /* Creating the Final Maps */

2017-10-20T15:09:52Z

Creating the Final Maps

Elenilatsis: /* Creating the Final Maps */

2017-10-20T15:00:39Z

Creating the Final Maps

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 == Data ==
 ===Data Identification===
-The data to be used in the tutorial was determined through the identification of criteria and research into the availability of the data required. Carleton University library had all of the data compiled from their original sources. The data available is relatively recent in terms of the last studies conducted (Census) and explains the criteria we are looking for. The data sets included are as follows:
+The data to be used in the tutorial was determined through the identification of criteria and research into the availability of the data required. Carleton University library had all of the data compiled from their original sources, but they are also available straight from the City (see below). The data available are relatively recent in terms of the last studies conducted (Census) and explains the criteria we are looking for. The data sets included are as follows:
 . Ottawa Thematic Data

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 Grass GIS operates on Mac OS and Linux properly, if using Microsoft it is recommended to use a Linux virtual machine.
-If you choose to run Grass GIS on Mac OS and are currently operating Mac OS X 10.11 (El Capitan) and above you will need to restart your computer in recovery mode. This does not do any hard to your computer and allows you to easily run Grass GIS on the newer Mac operating systems. (Note: You can download the Grass frameworks and software before restarting in recovery mode)
+If you choose to run Grass GIS on Mac OS and are currently operating Mac OS X 10.11 (El Capitan) and above you will need to restart your computer in recovery mode and disable a new security feature that disables many third-party software packages. This does not do any harm to your computer and allows you to easily run Grass GIS on the newer Mac operating systems. (Note: You can download the Grass frameworks and software before restarting in recovery mode)
 To do this simply follow the instructions below:
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 . When the Terminal Window opens type in: "csrutil disable" and then press Enter
-. Restart your computer again
+. Restart your computer again.
-. You should now be able to run Grass GIS
+. You should now be able to run Grass GIS.  If you ever want to re-enable the extra-protective security features, repeat these procedures but use the command "csrutil enable" in step 3.
 == Data ==

← Older revision		Revision as of 16:57, 20 October 2017
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	== Conclusion ==		== Conclusion ==
	The usefulness of thematic mapping can go much farther than this specific application. Thematic mapping can show a variety of data in an easily interpretable manner. The project that was conducted in this tutorial is one such example that gets you to use the basic applications of working with vector maps and creating thematic maps. This project can also be improved upon with new data and refining of the current product.		The usefulness of thematic mapping can go much farther than this specific application. Grass GIS is not the best software for creating thematic vector maps, however with the help of recent developments it has become easier to create them. Thematic mapping can show a variety of data in an easily interpretable manner. The project that was conducted in this tutorial is one such example that gets you to use the basic applications of working with vector maps and creating thematic maps. This project can also be improved upon with new data and refining of the current product.

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 == Introduction ==
-The purpose of this tutorial is to show how to represent and visually understand spatial vector data using thematic mapping. This tutorial addresses a problem that many individuals have when looking for new housing. The issue is of finding the most appropriate area to live in based on a multitude of factors. This tutorial focuses on Carleton University students in particular and the confusion or misinformation in choosing an appropriate place to live in Ottawa off campus. This issue is addressed through the use of thematic mapping and criteria outlined by the [http://housing.carleton.ca/off-campus/advice-and-cautions/ Carleton University Off-Campus Housing Office]. For the sake of time there are only three main factors looked at when looking for where to live, they are: Rent price, Crime/safety, and Proximity to the university.
+The purpose of this tutorial is to show how to represent and visually understand spatial vector data using thematic mapping. This tutorial addresses a problem that many individuals have when looking for new housing. The issue is of finding the most appropriate area to live in based on a multitude of factors. This tutorial focuses on Carleton University students in particular and the confusion or misinformation in choosing an appropriate place to live in Ottawa off campus. This issue is addressed through the use of thematic mapping and criteria outlined by the [http://housing.carleton.ca/off-campus/advice-and-cautions/ Carleton University Off-Campus Housing Office]. For the sake of time there are only three main factors taken into account when looking for where to live, they are: Rent price, Crime/safety, and Proximity to the university.
 This tutorial will show how to add and manipulate relevant spatial data in order to make thematic maps representing the criteria students are looking for. The tutorial can act as a precursor to a tool that can be implemented by Carleton University to develop a thematic map that students without the GIS knowledge to use. There is a lot of potential for this to be used for more than just students as well since it helps people find places to look for housing based on ideal criteria.

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 The purpose of this tutorial will be to use multiple tools in [https://grass.osgeo.org Grass GIS] that will manipulate vector data. The example to be used in the tutorial will be the analysis of Ottawa City neighbourhoods to determine where would be the most appropriate place to live as a student attending Carleton University. This tutorial will use the following tools:
-'''Extract'''- selection by attributes, '''Patch'''- patch vector layers together, '''Select'''- selection by location,
+'''Extract'''- selection by attributes, '''Patch'''- patch vector layers together, '''Select'''- selection by location, '''Clean vector map''' to remove any duplicates, '''Overlay'''- clip tool, '''Buffer'''- generate buffer and '''Add thematic (choropleth) vector map layer''' to create two different thematic maps.
+There will also be some coding using the command console in order to create thematic choropleth maps.
-'''Overlay'''- clip tool, and '''Buffer'''- generate buffer
-There will also be some coding using the command console for tools that are not included in the WxGUI.
 ''This is a basic introduction to thematic mapping using the Grass GIS software vector analysis capabilities.''

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 '''3.''' Total Crime in Carleton Neighbourhoods Final Map
-[[File:Final crime map.png]]
+[[File:Final crime map.png|731x599px]]
 Figure 28: Final Choropleth map for total crime in Carleton's surrounding neighbourhoods.
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 '''4.''' Average Rent in Carleton Neighbourhoods Final Map
-[[File:Final rent map.png]]
+[[File:Final rent map.png|729x599px]]
 Figure 29: Final Choropleth map for average rent in Carleton's surrounding neighbourhoods.

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 '''2.''' In order to create your legend, select ''Add vector legend'' as shown above in Figure 25. To edit the legend title, simply double click your legend, which will open the ''d.text'' window, allowing you to add a map title, size, etc.
-[[File:Legend edit.png]]
+[[File:Legend edit.png|800x520px]]
 Figure 26: ''d.text'' window.

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 === Creating the Final Maps ===
-Final maps can be created by using the ''Add map feature'' button in the Grass GUI.
+'''1.''' Final maps feature can be added by using the ''Add map feature'' button in the Grass GUI.
 [[File:Add map feature button.png]]
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 Figure 25: How to add final map features using the Grass GUI.
+'''2.''' In order to create your legend, select ''Add vector legend'' as shown above in Figure 25. To edit the legend title, simply double click your legend, which will open the ''d.text'' window, allowing you to add a map title, size, etc.
+[[File:Legend edit.png]]
+Figure 26: ''d.text'' window.
+In order to edit the way layers are displayed in your legend, simply double click the layer in the ''Layer Manager'' window, bringing you to the layer properties. Under the ''Legend'' tab, you can specify the name of the layer, the layer icon and whether or not you would like the layer to be featured in the map legend. Please see Figure 27.
+[[File:Legend edit 2.png|699x600px]]
+Figure 27: How to edit the way your layers are displayed in the legend.
 == Conclusion ==