Surface Quiz for COCC GEOG 287
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What is a surface? | A continuous field of values that may vary over an infinite number of points
🗑
|
||||
| What are some Discrete Surfaces? | *Dot Distribution
*Proportional Symbols
*Choropleth
*Isarithmic
🗑
|
||||
| What are the methods for creating Raster Surfaces? | Interpolation
*Inverse Distance Weighted
*Trend Surface
*Spine
*Kriging
🗑
|
||||
| What are the methods for creating Vector Surfaces? | Triangulation
*TIN
🗑
|
||||
| How does TIN work? | Constructed by triangulating vertices which are connected in a series of edges to form a network of triangles.
🗑
|
||||
| What is Delaunay Criteria? | No vertex lies within the interior of any of the circumcircles of the triangles in the network.
🗑
|
||||
| Drawbacks of TIN surfaces? | * Less available
* Tend to cost more to build and process
🗑
|
||||
| What is Interpolation? | Estimating unknown values that fall between known values
🗑
|
||||
| What is Linear Interpolation? | Common Slope, most basic interpolation, assumes a linear line
🗑
|
||||
| What is Inverse Distance Weighting (IDW)? | Sample points closer to the cell have a greater influence on the cell's estimated value than sample points that are farther away
🗑
|
||||
| What are some traits of IDW? | *Will not exceed or pass through points
*A points influence on the kernel is weighted by the square of the distance from the kernel
🗑
|
||||
| What is Spline Interpolation? | Spline interpolation method fits a flexible surface through the known value locations
🗑
|
||||
| What are some traits of Splining? | *Through each sample point and may exceed the value range of the sample point set.
🗑
|
||||
| What is Trend Surface Interpolation? | “Best-fit” based on mathematical equation, uses orders i.g. 1st order, 2nd order, 3rd order to determine best fit.
🗑
|
||||
| What is Kriging Interpolation? | Is an advanced geostatistical procedure that generates an estimated surface from a scattered set of points with z-values based on statistical models that include autocorrelation.
🗑
|
||||
| Describe the elements of a Semivariogram? | *Sill- The Y- peak where the data levels out
* Range - The X value where the peak of the data is
*Nugget Variance - The Y Intercept (where the value crosses the Y axis)
🗑
|
||||
| What are some problems with Interpolation? | *Number of sample points can limit accuracy
*Location of sample points may not represent population
*Saddle points
*Don't extrapolate
🗑
|
||||
| What is Dasymetric Mapping? | Mapping depicts quantitative areal data using boundaries that divide the area into zones of relative homogeneity with the purpose of better portraying the underlying distribution.
*GIS does not have this capability, yet
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
Sevcav
Popular Geography sets