How to empower community by using GIS lecture 2

地理資訊系統於高中職社區化之應用 How to empower community by using GIS Lecturer: Yao-hui Wang

Lecture 2 Content And Operation of ArcGIS
Lecture Outline
1.What is ArcGIS ?
2.Content of ArcCatalog
3.Geographic Data Models in ArcGIS
4.Content of ArcToolbox
5. Practical Section

What is Arc GIS
ArcGIS ≠ ArcMap
ArcGIS ≠ ArcGIS Desktop
Actually ArcGIS is……..

Source: ESRI, what is ArcGIS TM ? (2001)

Source: Ibid That’s what our group always execute previously.

What ArcGIS Desktop Contain
ArcCatalog
ArcToolbox
ArcMap
And sometime you may use…..
ArcScene
ArcObject Developer Help
Frequently used

Definitely…Conducting a Project Is Always The Best Way to Learn GIS
Use ArcCatalog to find, preview, document, and organize geographic data and create sophisticated geodatabases to store that data
Use ArcMap to view, edit, and analyze your geographic data
Use ArcToolbox to deal with Geoprocessing
In a Project, We will:

The Steps in a GIS Project
Step 1: Identify Your Objectives
Step 2: Create a Project Database
Step 3: Analyze the Data
Step 4: Present the Results
And What’s Next ?

Step 1: Identify the Project Objectives
Preface: the city council want to use a GIS model to site a wastewater treatment plant. And you are the selected GIS expert to conduct with this project.
The city council has provided you with a list of the criteria for a suitable site. The parcels chosen for the site must be:

Below 365 meters in elevation, to minimize pumping costs
Outside of the floodplain, to avoid spillage during storms
Within 1,000 meters of the river, to minimize pipeline construction for treated water that is discharged
At least 150 meters from residential property and parks, to minimize the impact on the city.s residents
On vacant land that can be developed, to minimize land acquisition and construction costs

In addition, to further reduce construction costs, the city would prefer that the site be:
Within 1,000 meters of the main wastewater junction (within 500 meters is considered even more suitable)
Within 50 meters of an existing road
The plant will also require a total of at least 150,000 square meters in area.

Step 2: Create the Project Database
You need to
Assemble the existing data and review it----Check the criteria and present them by layers
2. Prepare the data for analysis----
Checking data quality (making sure the data is accurate and up-to-date)
Converting data between formats

Automating data by digitizing, scanning, converting, or geolocating
Defining coordinate systems
Projecting layers to a new coordinate system
Merging adjacent layers

Step 3: Analyze the Data Or Source: ESRI, Getting stared with ArcGIS, 1999

Convert to Raster data Environmental Criteria 1 Environmental Criteria 2 Environmental Criteria 3 Figure 3 Figure 2 Figure 1 Multiply Figure 4 Economic Criteria 1 Economic Criteria 2 Economic Criteria 3 Classify Figure 6 Figure 7 Figure 8 Standardise MCE Routine User Weight Output Figure 12 Clip Figure 13 Classify Operate Select Clip Convert to Vector Figure 15 Figure 16 Figure 17 Mask Mask Figure 18 Filter Figure 21 Decision Making Detail Assessment Figure 22 VIA Figure 14

Step 4: Present the Results
Now suppose you are going to present your project at a public meeting you need to consider:
1.Who is your Audience ?
2.What do the equipments you get ?
3.How long would it take ?
4.What kind of problems would they ask ?

Using ArcCatalog Source: Michael Zeiler, Modeling our World (1999)

Source:Ibid

Assembling the database
1. Navigate to the ArcGISArcTutorGetting_Started folder. Double-click the Getting_Started folder to show its contents.

2. Copy the folder and save it as a folder in C:drive or D: drive

3. Create a personal geodatabase

4. Create the City_layers and Analysis folders

a. Copy the parks feature class from the GreenvalleyDB geodatabase to the your project geodatabase. 5.Adding data to your project folder Here are the steps:

b. Create the streets layer in the City_layers folder.

Then in the Save Layer As dialog box, navigate to the City_layers folder in your project folder and name the layer .streets.. Click Save.

c. Create the flood_zone layer in the City_layers folder.

At this point, you have created your own project database as the graph.

Using ArcToolbox Firstly, the tools can be categorized into 4 groups

Analysis Tool

Conversion Tools

Data Management Tools

My tools

Due to the limited time and non-necessary to present all the tools, here we just use data management tools as our practical example.
1. Double click project wizard (shapefiles, geodatabase) as right side.

2. Choose the shapefile or geodatabase which is you supposed to set up or change the projection.

3. If the shapefile or geodatabase you choose was set up the projection system before, the warning window would appear. Just click OK or 確定 . Then the wizard will go on

4. Click the ‘‘next step’’ and the ‘‘Select Coordinate System’’ would appear.

5. Spatial Reference window would appear and here you can choose to ‘’Select’’ the coordinate systems which are predefined in ArcGIS, ‘’Import’’ a coordinae system from an existing geodataset or create a new coordinate system from the data which is collected by your GPS or field work survey.

Using ArcMap
Here is today’s assignment.
1. Add all the layers into a mxd file.
2. Try to convert all the layers into the same data structure. (e.g all become raster or all become raster), then compare the result with the original dataset.
Most of the members of our society have the idea about how to manipulate ArcMap. However when you are dealing with the analysis or representation, you will get the chance to use ArcToolbox and ArcCatalog. So…..

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How to empower community by using GIS lecture 2

by wang yaohui on Oct 28, 2006

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How to empower community by using GIS lecture 2 — Presentation Transcript