IDES GIS Workshop Day 4 - Dawn Wrightdusk.geo.orst.edu/Pickup/IDES/IDES_intro4.pdf · IDES GIS...
Transcript of IDES GIS Workshop Day 4 - Dawn Wrightdusk.geo.orst.edu/Pickup/IDES/IDES_intro4.pdf · IDES GIS...
IDES GIS Workshop Day 4
Professor Dawn Wright
Grad Assistant Lalo Guerrero
Feature Type! !Single Part ! !Multi-Part!
Point!!Line !!!
Area!!Annotation!!!!
W A Y 10
Object/Vector Feature Types
Raster or Grid Data Structure. R o w s
Columns
Grid!cell!
Grid extent!
Resolution!
Feature Type! !Single Part ! !Multi-Part!
Point!!Line !!!
Area!!Annotation!!!!
W A Y 10
Object/Vector Feature Types
“Rasters tell WHAT occurs everywhere.”
! natural for scanned or remotely sensed data.
! continuous surfaces (e.g., topography) ! spatial analytical operations are faster. ! compression is easier
Orange County, CA
Courtesy of Russ Michel, Pictometry Intl. Inc.
Raster
Vector
Projected with flat ground plane Projected with tessellated ground plane
Courtesy of Russ Michel, Pictometry Intl. Inc.
Orange County Street Centerlines
National Polar-orbiting Operational Environment Satellite System (NPOESS), a next-generation platform for weather and climate.
Courtesy of Ted Strub, OSU CIOSS
Components of a passive remote sensing system Example with infrared or microwave wavelengths
signal raw data
processing / dissemination calibration/
validation
sensor
IR or µ-wave Emission
Two types of remote sensing:
Passive
Courtesy of Ted Strub, OSU CIOSS
LandSat is an example of a passive remote sensing system (spaceborne satellite)
IR or µ-wave Emission
Old MSS – Multispectral
Scanner
Current ETM –Enhanced
Thematic Mapper
Components of an active remote sensing system Transmit at nadir (directly beneath satellite)
source and sensor!
signal raw data
processing / dissemination calibration/
validation
Two types of remote sensing:
Active
µ-wave radar Reflection
Courtesy of Ted Strub, OSU CIOSS
LIDAR is an example of an active remote sensing system (airborne)
IR or µ-wave Emission
A. Nayegandhi, USGS
Aircraft elevation ~700 m
Scan width ~300 m
Scan angle ~30°