Geoprocessing and Editing

Question 1

Give examples of geoprocessing?

Answer 1

1) MERGE
2) NEAR
3) CLIP
4) VIEWSHED
5) LINE OF SIGHT

Question 2

Name 2 geoprocessing operations?

Answer 2

1) Union

2) Intersect

Question 3

Give two examples of geoprocessing examples.

Answer 3

BUFFERING and VORONOI POLYGONS Buffers create polygon, its a good way of creating roads etc. from centrelines.

Question 4

What is a model builder?

Answer 4

A means of visually combining multiple geoprocessing operations into a single item. Can be used as a new Tool. Simplifies procedures. Can be exported as a Python Script.

Question 5

What is python?

Answer 5

A scripting language that can be used to build geoprocessing scripts in ArcMap with or without the map interface.

Question 6

What do you use the editing feature for? (5)

Answer 6

• Digitising in ArcMap.
• Creating new geometry: Points, Lines and Polygons.
• Editing Geometry and other tools.
• Attribute tables.
• Loading point Data.

Question 7

What do you do with start edit window?

Answer 7

• Select the Dataset you want to edit from the list.

* All datasets stored in the selected folder or Feature Dataset will become editable.

Question 8

What is point digitising?

Answer 8

If the target dataset contains Point data then the user can add new Points by selecting the location with a mouse or selecting the location by giving coordinates, offsets etc.

Question 9

What is point distinguishing?

Answer 9

If the target dataset contains Point data then the user can add new Points by selecting the location with a mouse or selecting the location by giving coordinates, offsets etc.

Question 10

What is line digitising?

Answer 10

Lines can be created by clicking and adding vertices (points) that make up the line. The direction (bearing) of a line can be fixed. A vertex can be set an exact distance from the previous vertex.

Question 11

What is polygon digitising?

Answer 11

Polygons can be digitised in the same way as lines

In a polygon the last and first vertex is at the same position

Question 12

What does the feature construction toolbar contain?

Answer 12

The feature Construction toolbar contains additional tools to create curves, right angles and to trace existing features

Question 13

What is snapping?

Answer 13

Snapping is the process of jumping to a feature when a mouse click is within a certain distance. Snapping ensures that features that should be connected are connected.

Question 14

What is tracing?

Answer 14

The Trace Tool allows the user to trace around existing features to create new ones.

Question 15

What is attribute editing?

Answer 15

Attributes can be added at Creation with pop up or can be edited in the Attribute Table within an EDIT Session
New attribute columns can ONLY be added OUTSIDE of an EDIT session, calculated Fields can be done either in or out of an EDIT session

Question 16

What is Raster editing?

Answer 16

Raster data = continuous data e.g. Digital Elevation Models, can do so via Raster Calculator or other Map Algebra tools, can edit certain types of Raster data such as TINs (triangulated irregular networks), Normal raster data can be edited by converting to polygons with value, Editing values Converting back to Raster.

Question 17

What is loading point data?

Answer 17

Primary data collection often done in the field GPS locations, ,any instruments output CSV (text data) with coordinates Or From an EXCEL (.xlxs) spreadsheet.
Data can be loaded in GIS, converted to XY Events and exported as SHAPEFILE or FEATURE CLASS.

Question 18

How to create events layer? (4)

Answer 18

1) Select X and Y fields
2) Specify Coordinate Reference System
3) Creates Temporary visualisation of locations
4) Export EVENTS layer to Shapefile or Feature Class
Also tools for importing polygons and lines

Question 19

What are the many options that can carry out on both raster and vector data.

Answer 19

Geoprocessing are the many operations that we can carry out on BOTH raster and vector data. These are combined in geoprocessing chains

Question 20

What can we create that automate geoprocessing chains?

Answer 20

1) Models

2) Scripts