Term
Environment Parameters---> workspace
10. |
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Definition
| where you tell GIS where to save |
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Term
Environment Parameters---> processing extent
10. |
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Definition
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Term
Environment Parameters---> geodatabase
10. |
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Definition
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Term
Environment Parameters---> raster analysis
10. |
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Definition
| where you determine cell size and where you can mask your output so it's the same shape as your other layer |
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Term
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Definition
| Data Management> Projections and Transformations> Feature> Project |
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Term
Difference between Geographic Coordinate System (GCS) and Projected Data (GCS projected, UTM, and State Plane)
10. |
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Definition
GCS is a folder full of 100's of datums using longitude and latitude. They are all UNPROJECTED.
Projected Data (they are all PROJECTED) is a folder that includes "GCS projected" (projected latitude and longitude), "UTM" (eastings and northings, global), "State Plane" (eastings and northings, only US), and "National Grid" (international equivalent to State Plane) |
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Term
How are UTM and State Plane projections formed?
10. |
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Definition
| map is projected first and once it's flat, the coordinate system is added |
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Term
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Definition
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Term
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Definition
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Term
units of state plane?
10. |
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Definition
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Term
How to extract data from Google Earth
10. |
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Definition
search "McDonalds locations"
select locations you want
right click and select "Save Place as"
save as Name.kmz
convert .kmz to fearture class |
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Term
How to convert .kml or .kmz to feature class
10. |
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Definition
| ArcToolbox> Conversion tools> From KML |
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Term
Did Google mapping car run over donkey in Botswana?
10. |
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Definition
| No. It was only rolling in the road before the car got to it. |
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Term
Which are required for more types of analysis? Projected or Unprojected data?
10. |
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Definition
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Term
3 uses of mapping change
8. |
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Definition
1. show differences before or after an event
2. show data readings over time
3. keep data up to date |
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Term
knowing how things change over time helps us: (4)
8. |
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Definition
1. determine how things behave through time
2. anticipate future conditions
3. decide on a course of action
4. evaluate results of policy or actions |
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Term
three main types of change we can map:
8. |
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Definition
| changes in: location, values, and character |
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Term
What kind of map do you make for a
change in location?
8. |
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Definition
| tracking map- plot position over time |
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Term
What kind of map do you make for a
change in value or magnitude?
8. |
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Definition
| difference map- subtract values or express values as a percent change |
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Term
What kind of map do you make for a
change in character?
8. |
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Definition
| difference map- usually land use or land cover change over time |
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Term
what tool helps visualize change through time?
7. |
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Definition
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Term
before a proximity analysis what must you make sure of?
7. |
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Definition
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Term
VECTOR proximity tools are located....
7. |
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Definition
| ArcToolbox> Analysis Tools> Proximity |
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Term
Name the four tools in proximity analysis that we went over:
7. |
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Definition
| buffer, multi-ring buffer, near tool, create thiessen polygons |
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Term
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Definition
| used to select feartures within a specified distance of points, lines, or polygons |
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Term
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Definition
| used to select features within multiple specified distances |
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Term
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Definition
| assigns distance and direction from points in one layer to points in another layer |
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Term
Which proximity tool do you use to make a spider diagram?
7. |
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Definition
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Term
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Definition
| the vector version of an allocation surface |
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Term
RASTER proximity tools are located....
7. |
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Definition
| ArcToolbox> Spatial Analyst Tools> Distance |
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Term
| Three raster proximity tools are: |
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Definition
| Euclidean distance, euclidean direction, euclidean allocation |
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Term
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Definition
| grid cell values represent distance to nearest point or line |
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Term
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Definition
| grid cell values represent the direction to the nearest point or line |
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Term
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Definition
| grid cell values represent the Object ID of the nearest point or link |
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Term
What does a proximity analysis do?
7. |
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Definition
| finds what's nearby, and compares layers to examine spatial relationships |
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Term
What are the units of a raster grid cell size?
7. |
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Definition
| depends on the projection |
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Term
What does an overlay analysis do?
6. |
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Definition
| involves overlaying layers to examine the spatial relationship between layers |
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Term
Three ways to do an overlay analysis:
6. |
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Definition
| Spatial Join, Joins and Relates, Select by Location |
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Term
Spatial Join: what it is, how to get to it, and most frequently used tools
6. |
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Definition
1. joins attributes from one layer to another layer based on location,
2. go to ArcToolbox> Analysis Tools> Overlay
3. Intersect, Union, Spatial Join |
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Term
Overlay Analysis: Intersect
[image] +[image]=????
6. |
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Definition
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Term
Overlay Analysis: Union
[image]+[image]=???
6. |
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Definition
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Term
Overlay Analysis: Spatial Join
6. |
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Definition
| Creates a table join in which fields from one layer's attribute table are appended to another layer's attribute table based on the relative locations of the features in the two layers. |
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Term
Joins and Relates: how to find and what does this do?
6.
6. |
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Definition
1. Right click on a layer name and select Joins and Relates> Joins
in join data dialog box click "Join data from another layer based on location"
2.this GENERATES STATISTICS (average, sum, max, min) based on location |
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Term
Select by location: how to get there
6. |
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Definition
On the main tool bar use "Select by Location" in the dialog box specify
1. Target layer (feature to be selected)
2. Source layer (layer used to select features) |
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Term
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Definition
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Term
Three ways to map density
5. |
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Definition
1. dot density map (not very appealing)
2. choropleth, graduated symbol or proportional symbol density map
3. density surface |
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Term
for choropleth maps what must you sometimes do?
5. |
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Definition
| divide count field by area field. Sometimes you even need to calculate the area field |
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Term
What does a density surface do?
5. |
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Definition
| highlights the concentration of point or line features (or polygon centroids) |
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Term
density tools are located:
5. |
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Definition
| ArcToolbox> Spatial Analyst Tools> Density |
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Term
density surface can be represented in two ways:
5. |
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Definition
1. # of points/unit area (playas/km2)
2. weighted by an attribute (area of playas/km2) |
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Term
What must you remember when creating a density surface?
5. |
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Definition
Project your data!
(UTM, State Plane, Equal Area) |
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Term
Three ways to make a density surface:
5. |
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Definition
1.point density (grid cell= total # of features in search radius)
2.line density (grid cell= total line length within search radius)
3. kernel density (cells further assigned lower values) |
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Term
4 characteristics of Kernel density surface:
5. |
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Definition
1. can be used to create line or point density surfaces
2. a tapered (quadratic) search radius decreases emphasis away from the center grid cell
3. cells farther are assigned lower calues until you get to 0 at the edge of the radius.
4. generally results in a smoother surface |
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Term
The look of the density surface output varies by:
5. |
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Definition
cell size, output unis, search radius
*important to try different settings |
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Term
| default area unit of output density surface is selected based on: |
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Definition
linear unit of projection
input:
meters (UTM)
feet (State Plane)
output:
sq/km (UTM)
sq/miles (State Plane) |
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Term
of point, line, and kernel densities, which two can you only use a circular search radius?
....which one lets you search by squares and other shapes?
5. |
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Definition
line and kernel densities
point density |
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