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| uses a series of x-y locations to store info |
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| a set of spatial data represented as small squares, called 'cells', or pixels |
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| info is tied to a specific location on the Earth's surface |
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| like features that are grouped into data sets |
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| a map in which the states are colored based on an attribute field |
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| contain multiple feature classes that are in some way related to each other |
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- stores individual features with high precision
- linked attribute table provides great flexibility in both the number and types of attributes
- compact way of storing data
best way to determine perimeter and area |
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| drawbacks of vector data: |
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Definition
- poorly adapted to storing continuously varying surfaces
- calculating derived information from contours is difficult
- some types of analysis are more time-consuming to perform with vectors |
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a version of vector data that stores features of the file as independent objects, unrelated to each other
- commony used to transfer vector features from one GIS system to another |
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| stores features, but also contains information about how the features are spatially related to each other |
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| over the same area on 2 different occasions |
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| connects to a crossroad or has an overpass |
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evaluates whether a data model or data set accurately represents the real-world relationships between features
- Topology can be used to better model the real-world behavior of features |
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| rasters that represent discrete objects |
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stores elevation values
(commonly refered to as 'continuous rasters'.) |
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| multiple array of values. (R,G,B) |
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Digital Raster Graph
- digital scan of a paper map |
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The x and y dimensions of each pixel
- The higher the resolution, the more precisely data can be represented. |
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The choice of values and units to store a data set.
- degrees of latitude and longitude - GCS
- scale in meters - Universal Tranverse Mercator
- scale in feet - State Plane
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| a measure of the size at which features in a map are represented |
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| refers to the x-y values of a feature class or raster |
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| refers to the attributes, as opposed to a feature class or raster |
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| indicates at which distance interval measurements are taken or recorded |
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| can be impacted by grouping associated with data collection |
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| indicates how frequently measurements are taken |
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| refers to either the number of significant digits used to record a measurement or the statistical variation of a repeated single measurement. |
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- ArcMap - prvides means to display, analyze, and edit spatial data and data tables.
ArcCatalog - a tool for viewing and managing spatial data files.
ALWAYS USE ARCCATALOG TO DELETE, COPY, RENAME, OR MOVE SPATIAL DATA FILES |
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