1⟩ Which of the following methods may be used to input paper maps into a GIS?
1. Scanning
2. Automatic digitizing
3. Manual digitizing
4. Keyboard entry
5. Tracing
Scanning
Automatic digitizing
Manual digitizing
GIS Date
Home Analysis GIS Date
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28 GIS Date Questions And Answers
2⟩ Which of the following can be a problem in manual digitizing?
1. Dimensional stability of source documents
2. Hand-eye coordination
3. Availability of suitable hardware and software
4. Boredom
5. Inaccuracies in document registration
Inaccuracies in document registration
Dimensional stability of source documents
Boredom
Hand-eye coordination
3⟩ Practical problems faced when scanning map documents include
1. Selection of appropriate tolerances
2. Lack of suitable raster to vector conversion software
3. Possibility of optical distortion
4. Inclusion of unwanted information
Inclusion of unwanted information
Selection of appropriate tolerances
Possibility of optical distortion
4⟩ What are the common problems faced when obtaining data from secondary sources?
1. Expense
2. Availability of suitable data
3. Unknown data formats
4. Unknown lineage
Availability of suitable data
Unknown lineage
Expense
5⟩ What are the three main types of data error?
1. Errors created by faulty processing.
2. Errors created by human error.
3. Errors from obvious sources (e.g. incomplete maps)
4. Errors created during data input (e.g. digitizing).
5. Errors created by map projection.
Errors from obvious sources (e.g. incomplete maps)
Errors created during data input (e.g. digitizing).
Errors created by faulty processing.
6⟩ Geocoding is the process of converting an address into a point location.
1. True
2. False
True
7⟩ What is Joining Data Files in GIS?
Once a GIS layer is created, its attribute file can be linked (joined) to external data files. Joining is one of the most frequently performed data file processes because it brings together feature attributes that are contained in multiple digital data files. To perform a join, a unique matching field, the key identifier, must be observed in both data files.
8⟩ What steps are involved in joining together two files are software specific?
★ Loading the external file that you wish to join to the GIS attribute file.
★ Selecting the external file and the GIS attribute file that you wish to join.
★ Selecting the field (containing the key identifier) in each file, and when joined.
★ Making sure that the join was successful.
9⟩ What is Comma delimited in GIS Date?
Comma delimited, also known as comma-quote delimited and CSV, separate fields by commas. Character fields may be enclosed in double quotes, and need to be if they contain an embedded comma. Two commas in a row signify that the field is blank. Usually whitespace is not allowed before or after fields (although this may be tolerated in the CSV form).
10⟩ Repeated generalization will make the boundary of a polygon more precise.
1. True
2. False
False
11⟩ How Sorting records in GIS Date?
Sorting temporarily rearranges your data file records, so you can view, select, update, or print them in the new sorted sequence. Although the specifics vary by program, you generally choose the field (or fields) you want to sort by. The first sort field arranges, usually in ascending or descending order, the records based on the field's contents. For example, a class roster might be sorted alphabetically by last name. Some systems allow you to choose a second sort field (or more), which arranges records (in ascending or descending order) when two or more records have the same first field value. If your alphabetical list has four students with the last name Maria then those four records could be rearranged in alphabetical order based on their first name.
12⟩ A pseudonode is a node, which can be removed from a vector dataset without affecting the topology.
1. True
2. False
True
13⟩ What is Spacequote delimited ASCII?
Spacequote delimited ASCII is a variant of whitespace delimitation, but the attributes containing multiple words are enclosed in double quotes, and consequently, they can contain embedded spaces between words.
14⟩ A sliver polygon may be the result of the same line on a map being digitized twice.
1. True
2. False
True
15⟩ RINEX is the abbreviation for Remote Information Exchange format.
1. True
2. False
False
16⟩ DXF and NTF are examples of vector transfer formats.
1. True
2. False
True
17⟩ A cheap flatbed scanner could have an accuracy of 50 - 200 dpi.
1. True
2. False
True
18⟩ An experienced user should be able to digitize data with accuracy equal to the width of the line they are digitizing.
1. True
2. False
True
19⟩ In point, mode-digitizing points are added automatically at set time or distance intervals as the user moves the cursor across the map.
1. True
2. False
False
20⟩ Keyboard entry is no longer used in GIS projects.
1. True
2. False
False
