puzzles how many bakers (from all datasets - could run merge) are not within 5 km from a bakery? or something. idk. could do a better question that doesnt presume bakers work at nearest bakery,

Tools and Workflows in intro to spatial patial analysis vector tools

clip, buffer, intersect, difference

selections: by attribution (done), location, distance

count points in polygon

change projection

JOINS and extract attribute selection - will do in reference mapping MAYBE THIS HAD TO GO IN REFERENCE MAPPING ? JOINS ETC.

ALSO CALCULATING AREA - THAT WOULD GO IN ATTRIBUTE TABLE SECTION - ALSO IN MORNING….

editing attribute table - calculating area

Vector Tools

This page will introduce some common vector tools for spatial analysis workflows. Vector tools can be accessed from the Vector menu, and are grouped by task: Geoprocessing, Geometry, Analysis, Research, and Data Management. You can also search for vector tools (and any other tool, for that matter) by name from the Processing Toolbox. The Processing Toolbox is a panel that can be opened from Processing menu at the top of your screen.

If for some reason you can’t find the Processing Toolbox, you may have to enable the processing plugin. In the main menu bar at the top of your screen, click on Plugins, then click on Manage and Install Plugins…. On the search bar, type in Processing. Select the Processing box and then click Close. You should now see the Toolbox icon and be able to proceed with the next steps.

Vector Tools:

• Geoprocessing
  • Clip
  • Buffer
  • Difference
  • Dissolve?
  • Intersection?
• Geometry
  • Centroids
• Analysis
  • Count points in polygon
  • ?
• Research
  • Select by location
  • Select within Distance
• Data Management
  • Merge
  • Reproject

Geoprocessing

Geoprocessing tools are useful for modifying the spatial extent of features, particularly in relationship to other layers. Geoprocessing is often done in the beginning of a QGIS project to prepare the data layers for further analysis.

Clicking a tool will open a dialogue window specific to that tool. On the right hand side will be a description of what the tool does, and on the left, prompts for selecting input layers as well as saving the output layer to a file.

Clip

Buffer

Difference

Dissolve?

Intersection?

Geometry

The geometry tools are useful for operations to do with the geometric shape of the feature layer.

Centroids

Centroids will calculate the geometric center of each feature and output a layer consisting of those points. To practice, run Centroids on ///

Analysis

The Analysis cluster contains vector tools for performing basic statistical analysis on layers.

Count points in polygon

Count points in polygon will add up the total features in a point layer that fall inside each feature of a polygon layer.

?

Research

The Research cluster of Vector tools –> Selections and generating random points for test scenarios.

Select by location

Select within Distance

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Data Management

The Data Management cluster of Vector tools is useful for modifying the data layer itself. For example, Reproject changes the data layer’s stored projection

Merge

Reproject

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Designing Workflows

Now it’s time to put everything you learned together by designing workflows to answer spatial questions. Using the tools above, think through how you might solve for the following…