Topic 3: Active Microwave Flashcards
what are the goals of remote sensing
- qualitative interpretation
- image classification
- Biophysical retrieval
Multi-frequency SAR
Combining SAR data from multiple missions.
usually collected within close time periods.
what is CIS
Canadian Ice Service
provided information for offshore waters
largest single user of SAR in Canada to create ice charts
what other data sources aid in SAR Ice Monitoring
- in-situ data
- Maps
- GIS Vector layers
- optical Imagery
- Weather station data
Quantitative analysis of SAR
have grown with better information on system and target effects on brightness temp
- scientific research
- field studies
_Validation programs
three main interpretation keys for analyzing SAR
tone
texture
shape
what is tone
represent the intensity of BT for each pixel
relates to physical properties
- can detect Marine winds
- polarization impacts tone
what does Co-pol emphasize in SAR
surface scattering
what does cross-pol ration emphasize in SAR
emphasizes volume scattering like vegetation.
what is texture in SAR
Shows complexities associated with spatial variation in image tone.
what is a first order texture statistic?
based on a moving kernal functions
- creates mean, range, variance,SD, Skewness.
- varies based on window size
what is second order texture statistic
GLCM is an example
- based on moving kernal functions as well
considers proximity and directionality.
GLCM
grey-level Co-occurence matrix
based on parmeters
- contrast
- correlationwha
what is shape in SAR
represents the identification of features in a tone or texture image based on an expected shape.\target identification like ships or icebergs
what is a constellation
a collection of satellites that orbit the earth that result in high revist frequency at high latitudes
- RADARSAT
