Intro to GIS
3 parts of Geospatial Technology – answer GPS, GIS, and Remote Sensing
Definition of GIS – answer a computerized database management system for capture,
storage, retrieval, manipulation, analysis, and display of spatial data.
what makes data spatial - answer data is spatial once it is given a place on a map.
4 types of distortion in Map Projections – answer Area, Shape, Distance, and Direction
What is GCS? – answer spherical coordinate system of degrees of latitude and
longitude that is used to locate features on the Earth's surface.
Difference between Unprotected and Projected data – answer unprotected data is data
spatially referenced using lat/lons laid on a sphere. Projected data has been taken off of
the globe/sphere and put on a flat piece of paper.
Difference between Defining Projection and using a Projection Tool to re-project -
answer The Project Tool acts on the x-y coordinates of a layer and converts them to a
different coordinate system.
The Define Projection tool only changes the coordinate system label of the feature
class.
3 types of commonly used Coordinate systems, and label examples. - answerState
Plane, UTM, and Lambert Conformal Conic
Difference between UTM and State Plane- label examples. - answerUTM- world divided
in 60 zones at 6 degrees each
State Plane- for the US only, states divided into one or more zones and ID'd by a unique
FIP number.
list at least 2 common Datum - answerNAD1983, NAD1927
How would you fix a file with an undefined projection? - answerUsing the Project tool,
convert the x-y coordinate values in a feature class to a different coordinate system.
How do you change a file from a GCS to a projection? - answeruse the project tool
What does every projection have? - answerGeographic Coordinate System
What are the parts that make up spatial reference? - answercoordinate system
, What is domain vs extent? - answerThe domain is the range of allowable x-y values that
can be stored in a feature class.
The extent is the range of x-y coordinates of the features actually in the feature class.
Which type of map projection is better for area, distance, shape, etc.? - answerdistance-
equidistant
shape-conformal
area-equal area
direction-azimuthal
Why is GCS not good for measuring area and distance? - answerThe further you get
away from the Equator, the more distorted the map.
What is Latitude and what is Longitude? - answerLatitude-measure vertical angles
above or below the equator
Longitude-measures horizontal angles east or west of the Prime Meridian
Where is the Prime Meridian and where is the Equator? - answerIf you don't know
where these are located on a map, I wonder how you haven't drowned in the bathtub
yet...
What does Georeferenced mean? - answerdata that has been assigned a real-world
coordinate system
Are storage units, map units and display units the same? - answerno- each represent
which coordinate system is utilized for each space.
What is extent? - answerthe range of x-y coordinates displayed in a map or stored in a
data layer
Difference between raster data model and vector data model - answerraster- one raster,
one data
vector-
Define Raster Data and give an example. - answera data set composed of an array of
numeric values, each of which represents a condition in a square element of ground.
difference between discrete and continuous data. - answerdiscrete- raster that store
vector features in a raster format.(i.e. roads, pipelines, land use polygons)
continuous-values range smoothly into one another, forming a continuous surface. (i.e.
Digital elevation model DEM)
Example of 3 raster data formats - answertiff, jpeg, orthophoto, Landsat
3 parts of Geospatial Technology – answer GPS, GIS, and Remote Sensing
Definition of GIS – answer a computerized database management system for capture,
storage, retrieval, manipulation, analysis, and display of spatial data.
what makes data spatial - answer data is spatial once it is given a place on a map.
4 types of distortion in Map Projections – answer Area, Shape, Distance, and Direction
What is GCS? – answer spherical coordinate system of degrees of latitude and
longitude that is used to locate features on the Earth's surface.
Difference between Unprotected and Projected data – answer unprotected data is data
spatially referenced using lat/lons laid on a sphere. Projected data has been taken off of
the globe/sphere and put on a flat piece of paper.
Difference between Defining Projection and using a Projection Tool to re-project -
answer The Project Tool acts on the x-y coordinates of a layer and converts them to a
different coordinate system.
The Define Projection tool only changes the coordinate system label of the feature
class.
3 types of commonly used Coordinate systems, and label examples. - answerState
Plane, UTM, and Lambert Conformal Conic
Difference between UTM and State Plane- label examples. - answerUTM- world divided
in 60 zones at 6 degrees each
State Plane- for the US only, states divided into one or more zones and ID'd by a unique
FIP number.
list at least 2 common Datum - answerNAD1983, NAD1927
How would you fix a file with an undefined projection? - answerUsing the Project tool,
convert the x-y coordinate values in a feature class to a different coordinate system.
How do you change a file from a GCS to a projection? - answeruse the project tool
What does every projection have? - answerGeographic Coordinate System
What are the parts that make up spatial reference? - answercoordinate system
, What is domain vs extent? - answerThe domain is the range of allowable x-y values that
can be stored in a feature class.
The extent is the range of x-y coordinates of the features actually in the feature class.
Which type of map projection is better for area, distance, shape, etc.? - answerdistance-
equidistant
shape-conformal
area-equal area
direction-azimuthal
Why is GCS not good for measuring area and distance? - answerThe further you get
away from the Equator, the more distorted the map.
What is Latitude and what is Longitude? - answerLatitude-measure vertical angles
above or below the equator
Longitude-measures horizontal angles east or west of the Prime Meridian
Where is the Prime Meridian and where is the Equator? - answerIf you don't know
where these are located on a map, I wonder how you haven't drowned in the bathtub
yet...
What does Georeferenced mean? - answerdata that has been assigned a real-world
coordinate system
Are storage units, map units and display units the same? - answerno- each represent
which coordinate system is utilized for each space.
What is extent? - answerthe range of x-y coordinates displayed in a map or stored in a
data layer
Difference between raster data model and vector data model - answerraster- one raster,
one data
vector-
Define Raster Data and give an example. - answera data set composed of an array of
numeric values, each of which represents a condition in a square element of ground.
difference between discrete and continuous data. - answerdiscrete- raster that store
vector features in a raster format.(i.e. roads, pipelines, land use polygons)
continuous-values range smoothly into one another, forming a continuous surface. (i.e.
Digital elevation model DEM)
Example of 3 raster data formats - answertiff, jpeg, orthophoto, Landsat
