Exploring the Thematic Capabilities of OpenJump
Contents
Purpose
The purpose of the tutorial will to demonstrate the thematic capabilities of the open software called OpenJump. It will demonstrate some of the strengths of the program to alter data looking at the styles, symbology, and more. After showing the capabilities of this program through the creation of a thematic map, hopefully it helps either students or employers if they want to use this free program to edit their maps, or to buy an official and costly software such as ArcMap.
Introduction
OpenJump is an open source Geographic Information System that has been created by volunteers around the world. The program is capable of analyzing shapefiles and simple GML files, and displays the images. The particular strength of this program is its ability to edit geometry and attribute data which this tutorial will demonstrate. Using datasets provided from the Carleton database, this tutorial will pick data that can be easily understood and displayed on the program and then alter and edit it. This tutorial will create a thematic map using some data provided from the City of Ottawa, National Capital Commission, and the Rideau Valley Conservation Authority Thematic Data. These files have provided a number of geospatial datasets that include activities, assets, biophysical, boundaries, mapping, and planning.
Methods
Getting Started
The first step of this tutorial will to first download the software Open Jump. This link will provide the necessary package to open the software: http://sourceforge.net/projects/jump-pilot/files/OpenJUMP/1.8.0/[1]
Figure 1. The red circle shows where you can click to download the software and all of its packages
Collecting the Data
The data that will be used for this tutorial is provided from the National Capital Commission which can be found on the MacOdrum Library website. After finding the data, then download all the files that come with it, save it in your directory and then begin the process of using OpenJump.
Figure 2. This is where you can access the information used in this tutorial
Accessing the data
Open up OpenJump, then click on the file in the top left corner of the screen and then locate the downloaded files provided from the National Capital Commission. For this tutorial only the select few layers will be needed: Activities, Boundaries, and CanMap.
Figure 3. The red circle shows where you need to click in order to open and find the files, selecting Activities, Boundaries, and CanMap
From this step on, you will need to select the files that this tutorial will use to edit which are:
Activities:
- Picnic Areas
- Recreation, Paths, and Trails
- Canoe and Camping
Boundaries:
- Regions
- Gatineau Park
- Municipal Parks
CanMap
- Roads
Figure 4. This image shows the files that should be selected on the left, and on the right is an image of what the data should will like (Colours may vary)
Altering Data
From this step further, the data will have to be altered to help people understand the map, and show some of the programs strengths. The data after downloading is a bit confusing to grasp, but with a little bit of editing, it is possible to transform it into something that can be shared for academic use.
- Changing the Style
- In order to change the colours of certain layers, you can right click the layer of choice> Click on "Stlye"> then click on "Change Styles". This then opens up a window in which you can edit the properties.
Figure 5. Image depicts how to access the change styles window to edit
- Changing the Style Part 2
- With the Change Styles Window open you are free to select a variety of different colours, styles, patterns. All of this can be accomplished under the Rendering tab. For each data layer appropriate colours will be selected to form an easily read map.
Figure 6. Rendering is where you can alter the colours of selected layers, on the right of the rendering window there is a variety of pre-set colours to choose from, but if those colours do not satisfy yours taste, then by clicking on the three dots that are circled in blue in the image-a colour palette appears that allows you to select a larger range of colours.
- Making More Data Appear
- Editing the Data
- This program actually lets you alter the downloadable data to whatever fits your need. So if you obtain new up to data information you can update the data, or even add points of interest. For this exercise, we will show you how to edit this information. First you need to right click on the layer you wish to edit>select editable> then open up the attribute of the select layer you wish you wish to change. For this example because we want to show the distinguishing features between Ottawa and Gatineau, we are going to replace MCR with Gatineau so that there are only two main boundaries.
