GPS and Remote Sensing. Importance of GPS and RS. GPS and remote sensing imagery are primary GIS data sources, and are very important GIS data sources. GPS data creates points (positions), polylines, or polygons for GIS Remote sensing imagery are used as major basis map in GIS
H: topographic height or
h: ellipsoid height
N: geoid height
H = h - N
- 22 m Horizontal accuracy
- 27.7 m vertical accuracy
- 200 nanosecond time (UTC) accuracy
- 100 m Horizontal accuracy
- 156 m vertical accuracy
- 340 nanosecond time (UTC) accuracy
- Differential Code GPS (navigation): 1-10 m accuracy
- Differential Carrier GPS (survey):1 mm to 1 cm accuracy
http://www.trimble.com/gps/dgps-how.shtml Radionavigation Plan
http://www.geoplane.com/gpsneeds.html Radionavigation Plan
When you listen to the radio, or cook dinner in a microwave oven,
you are using electromagnetic waves.
When you take a photo, you are actually doing remote sensing
Passive: accuracies which will determine equipment cost.source of energy is either the Sun or Earth/atmosphere
- wavelengths: 0.4-5 µm
Earth or its atmosphere
- wavelengths: 3 µm -30 cm
Active: source of energy is part of the remote sensor system
- wavelengths: mm-m
- wavelengths: UV, Visible, and near infraredTypes of remote sensing
Camera takes photo as example, no flash and flash
Passive Remote Sensing accuracies which will determine equipment cost.
Active Remote Sensing
E. transmission, reception, and pre-processing
F. processing, interpretation and analysis
G. analysis and application
A. the Sun: energy source
D. sensor: receiving and/or energy source
NASA accuracies which will determine equipment cost.ResearchSpacecraft
Busy Traffic accuracies which will determine equipment cost.
The greatest canyon on Mars: Valles Marineris accuracies which will determine equipment cost.
1 meter, spatial resolution accuracies which will determine equipment cost.
red polygon is the Science Building
30 meter, spatial resolution
Northwest San Antonio
Spatial Resolution accuracies which will determine equipment cost.
Comparing a 2-bit image with an 8-bit image accuracies which will determine equipment cost.
Remote Sensing Raster (Matrix) Data Format accuracies which will determine equipment cost.
Soil accuracies which will determine equipment cost.
useImage processing and modeling
The size of a cell we call image resolution,
Such as 1 m, 30 m, 1 km, or 4 km