Data Manipulation Flashcards
Attribute (processes in ArcPro)
New Selection, Add to Selection, Remove from Selection, Subset Selection, Switch Selection, Clear Selection
Contains
features contain an input polygon (input polygon is selected)
Completely Contains
features must be completely in an input polygon (input polygon selected)
Contains Clementini
features must be completely in the input polygon but if it’s on the boundary, it will not be selected
Within
features will be selected if inside a selecting polygon
Completely Within
features will be selected if completely within selecting polygon - no overlap
Within Clementini
features will be selected and cannot be entirely on the boundary of the features
Are Identical to
features are identical to input layer
Boundary Touches
features will be selected if they have a boundary that touches a selecting feature - must be completely inside or outside the polygon
Share a Line Segment With
features selected if they share a line segment
Crossed by the Outline of
Input features will be selected if they are crossed by the outline of a selecting feature
Have their Center In
features will be selected if their center falls within a selecting feature
Contained By
Same as Within
.shp
shape format - feature geometry itself
.shx
shape index format - positional index of the feature geometry to allow seeking forwards and backwards quickly
.dbf
attribute information
.prj
projection format
.sbn & .sbx
spatial index
.shp.xml
geospatial metadata in XML format
.gdb
file geodatabase
.mdb
personal geodatabase based on Microsoft access
coverage file
point, arc, node, route, route system, section, polygon, and region
DGN
AutoCAD and Microstation
TXT
text
IMG
image
LiDAR
remote sensing technology that measures distance by illuminating a target with a laser and analyzing the reflected light
Raster
.jpg, .tif, .gif
Short Integer
between -32768 and 32768
Long Integer
between -2,147,483,648 and 2,147,483,647
Float
single precision floating-point numbers
Double
double precision floating point numbers
Text
could be a coded value - assign to an integer through a domain
BLOBs
data stored as a long sequence of binary numbers - ArcGIS stores annotation and dimensions as BLOBs - images, multimedia, bits of code
Object Identifiers
Unique IDs and FIDs
Global Identifiers
Global ID and GUID - data types store registry style strings consisting of 36 characters enclosed in curly brackets
Raster file types
raster can be stored within geodatabase
Geometry
point, line, polygon, multipoint, multipatch
1-1
each object of the origin table can be related to 0 or 1 object of the destination table
1-Many
each object in the orgin table can be related to the multiple objects in the destination table
Many-Many
multiple objects of the origin table can be related to multiple objects of the destination table
Primary Source
collected in digital format specifically for use in a GIS project
Secondary Source
data captured for another project but reused for this project
Transfer ( Data Transfer Structures)
follow Spatial Data Transfer Standard (SDTS) - Federal Information Processing Standard (173) - robust way of transferring GIS data between computers with no information loss, including metadata
Industry Standards (Data Transfer Structures)
typically don’t exchange topology, only graphic info; large number of format transfers
Open GIS Consortium (OGC) (Data Transfer Structures)
non-profit, international, voluntary consensus standards organization - created GML or Geography Markup Language - XML based encoding standard
PostScript (Vector)
page definition language to export or print a map
Digital Exchange Format (DXF) (Vector)
AutoCAD - no topology but lots of details
Digital Line Graph (DLG) (Vector)
distributed by the government and most GIS packages will import but extra manipulation needed
TIGER (Vector)
block level maps of every village, town and city in US
shapefile (Vector)
vector data that stores location, shape and attributes
Scalable Vector Graphics (SVG) (Vector)
extension of XML language
ArcInfo Coverage (Vector)
stores set of thematically associated data considered to be a unit
ArcInfo Interchange File (.e00) (Vector)
known as ArcGIS export file
Geodatabase (Vector)
object oriented data model represents features and attributes as objects
Standard (Raster)
rows and columns with a header information
Tagged Image File Formats (TIFF) (Raster)
associated with scanners
GEO-TIFF (Raster)
puts latitude/longitude at edges of pixels
Graphic Interchange Format (GIF) (Raster)
image files for sharp edges and few gradations of color
Joint Photographic Experts Group (JPEG) (Raster)
variable-resolution compression system with both partial and full resolution recovery
Digital Elevation Model (DEM) (Raster)
30 meter elevation data 1:24000 7.5 minute quadrangle maps or 1:250,000 3 arc second digital terrain data
Band Interleaved by Pixel (BIP) or Band Interleaved by line (BIL) (Raster)
good at storing different brightness levels
RS Landsat (Raster)
satellite imagery and BIL information are combined
Raster to Vector
not difficult based on pixel value
Vector to Raster
very difficult because pixels may distort the lines or exact point locations and would need to be re-digitized