21⟩ The Douglas-Peucker algorithm is
1. An algorithm to discretize line segments
2. An algorithm to search an R+ tree
3. An algorithm to discretize an arc
4. An algorithm to triangulate a polygon
An algorithm to discretize line segments
GIS Date
Home Analysis GIS Date
“GIS Date Input and Editing Interview Questions and Answers will guide now that GIS data represents real world objects (roads, land use, elevation) with digital data. Real world objects can be divided into two abstractions: discrete objects (a house) and continuous fields (rain fall amount or elevation). So learn more about GIS Data with the help of this GIS Date Input and Editing Interview Questions with Answers guide”
28 GIS Date Questions And Answers
22⟩ When digitizing manually using a digitizing table, registration of the map on the digitizer table must take place before digitizing can begin.
1. True
2. False
True
23⟩ What is rubber sheeting?
1. The process of matching two adjacent map sheets
2. Projecting map data from one coordinate system to another.
3. Stretching map coordinates to fit a series of known control points.
Stretching map coordinates to fit a series of known control points
24⟩ Which of the following methods may be used to check attribute data for errors?
1. Checking for extreme values
2. Checking for internal consistency
3. Comparing with other datasets
4. Checking for impossible values
Checking for impossible values
Checking for extreme values
Checking for internal consistency
25⟩ What is the data stream?
1. The process by which raw spatial data is processed into an integrated GIS database
2. The flow of data from one user to another
3. The flow of data from producer to GIS
4. The process by which maps are transferred between GIS platforms.
The process by which raw spatial data is processed into an integrated GIS database
26⟩ What are white-space delimited ASCII files in GIS?
White-space delimited ASCII files differentiates fields by the use of one or more spaces. Since spaces separate fields, fields that have no value must be represented by a non-blank code and character attributes cannot contain spaces between words (underscores can be used to separate words). You can open ASCII files in any word processor or text editor.
27⟩ Described deleting records in GIS?
You can delete a single record or a group of records in a data file by first selecting them and then deleting them. Since records are the database representation of features, when you delete records in the attribute file, you are also permanently discarding their spatial representation. The entire feature, graphic and record, is deleted.
28⟩ What is adding and deleting fields in GIS?
Fields define feature attributes. Most GIS programs provide a way for you to add or delete fields from within your open data file. GIS program will instruct you to define a new field. You will give it a name and select from options that determine the data format of the values that will be placed into the field. Deleting a field usually involves selecting the field and deleting it.
