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Transcript of Introduction to image processing for remote sensing ... · Università degli studi di Roma Tor...
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Università degli studi di Roma Tor Vergata
Corso di Telerilevamento e Diagnostica Elettromagnetica
Anno accademico 2010/2011
Dr. Matteo Picchiani
07/06/2011
Introduction to image processing for remote sensing:
Practical examples
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ESA has developed a series of Software ‘Toolboxes’
Each Toolbox is a collection of OPEN SOURCE software tools to help the
remote sensing community to exploit ESA (and others company) data.
BASIC
ERS&ENVISAT
(A)ATSR AND
MERIS
TOOLBOX
(BEAM)
BASIC
ERS&ENVISAT
ATMOSPHERIC
TOOLBOX
(BEAT)
BASIC
RADAR
ALTIMETER
TOOLBOX
(BEAT)
POLARIMETRIC SAR
DATA PROCESSING
AND EDUCATIONAL
TOOL
(POLSARPRO)
NEXT ESA
SAR TOOLBOX
(NEST)
GOCE USER
TOOLBOX
(GUT)
http://earth.esa.int/resources/softwaretools/
ESA EO User Toolboxes
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BEAM is an open-source Java toolbox and development
platform for viewing, analyzing and processing of optical remote
sensing raster data.
BEAM supports different ESA and other EO sensors and
generic data formats.
Supported Instruments Generic EO Data Formats
BASIC ERS&ENVISAT(A)ATSR AND MERIS TOOLBOXis
From http://www.brockmannconsult.de/cms/web/beam/
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VISAT - An intuitive desktop application to be used for visualization,
analyzing and processing of remote sensing raster data.
A set of scientific tools (> 11 Data Processors) running either from the
command line or invoked by VISAT, also entirely written in Java.
A rich Java API for the development of new remote sensing
applications and BEAM extension plug-ins.
User support: Tutorials, Plug-Ins, Issue tracker, Community Wiki
(http://www.brockmann-consult.de/cms/web/beam/documentation)
BEAM Components
From http://www.brockmannconsult.de/cms/web/beam/
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Image display and navigation even of giga-pixel images
Layer management allows adding and manipulation of overlays such as other
bands, images from WMS servers or ESRI shapefiles
Region-of-interest definitions for statistics and various plots
Band arithmetic using arbitrary mathematical expressions
Reprojection and ortho-rectification to common map projections
Geo-coding and rectification using ground control points
Store and restore the current session including all opened files, views and layers
VISAT
From http://www.brockmannconsult.de/cms/web/beam/
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VISAT INTERFACE
Menu Bar
Tool Bar
Image View
Product View
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Satellite raster data processing
Enhancing an image or extracting information or
features from an image.
Computerized routines for information extraction
(eg, pattern recognition, classification) from
remotely sensed images to obtain categories of
information about specific features.
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Image Processing Includes
Image enhancement and sharpening
Image filtering
Radiometric correction
Geometric correction
Image classification
Pixel based
Object-oriented based
Post-classification and GIS
Change detection
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What Is Image Enhancement?
Image enhancement is the process of making images more
useful.
The reasons for doing this include:
Highlighting interesting detail in images.
Change the visualization in order to achieve information.
Making images more visually appealing.
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Data Opening:
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Data Opening:
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Data Resizing:
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Data Resizing:
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Data Resizing:
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Linear Enhancement
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Linear Enhancement
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Linear Enhancement
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Are enhancement techniques that stretches the
range of image brightness in a non-proportional
manner.
A nonlinear stretch expands one portion of the grey
scale while compressing the other portion.
While spatial information is preserved, quantitative
radiometric information can be lost.
E.g. a logarithmic stretch compresses the higher
brightness values within an image and
disproportionately expands the darker values.
A - Unity Transfer Function
B - Logarithmic Transfer Function
C - Root Transfer Function
D - Exponential Transfer Function
E - Inverse Logarithmic Transfer Function
F - Histogram Equalization Transfer Function
DN - original brightness values
DN' - stretched brightness values
Non-linear Enhancement
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Non-linear Enhancement
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Non-linear Enhancement
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Non-linear Enhancement
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Spatial Filtering
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Spatial Filtering
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Low pass 3x3
Spatial Filtering
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Low pass 5x5
Spatial Filtering
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High pass 3x3
Spatial Filtering
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High pass 5x5
Spatial Filtering
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Spatial Filtering
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Laplace 3x3
Spatial Filtering
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High pass 3x3
Laplace 3x3
Spatial Filtering
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False Colour Composites
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Electromagnetic Spectrum
Remote sensing images
are taken within specific
spectral regions.
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The spectral bands of the LANDSAT Thematic Mapper
LandSat TM produces 7 digital images of a scene representing the 7 bands of
electromagnetic energy captured
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False Colour Composite Steps:
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* DATA FILE NAMES
The file naming convention for Landsat 7 GeoTIFF is as follows:
L7fppprrr_rrrYYYYMMDD_AAA.TIF where:
L7 = Landsat-7 mission
f = ETM+ data format (1 or 2)
ppp = starting path of the product
rrr_rrr = starting and ending rows of the product
YYYYMMDD = acquisition date of the image
AAA = file type:
B10 = band 1
B20 = band 2
B30 = band 3
B40 = band 4
B50 = band 5
B61 = band 6L (low gain)
B62 = band 6H (high gain)
B70 = band 7
B80 = band 8
MTL = Level-1 metadata
TIF = GeoTIFF file extension
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False Colour Composite Steps:
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False Colour Composite Steps:
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False Colour Composite Steps:
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False Colour Composite Steps:
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Band ratioing
Ratioing is an enhancement process in which the DN value of one band is divided
by that of any other band in the sensor array. If both values are similar, the
resulting quotient is a number close to 1. If the numerator number is low and
denominator high, the quotient approaches zero. If this is reversed (high
numerator; low denominator) the number is well above 1. These new numbers can
be stretched or expanded to produce images with considerable contrast variation
in a black and white rendition. Certain features or materials can produce distinctive
gray tones in certain ratios.
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This ratio distinguished vegetation, water and croplands. It has
enhanced forests, barren lands. Because forests or vegetation exhibits
higher reflectance in near IR region (0.76 -0.90 um) and strong
absorption in red region (0.63-0.69u m) region. This ratio uniquely
defines the distribution of vegetation. The lighter the tone, the greater
the amount of vegetation present.
TM4/TM3:
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TM4/TM3:
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TM4/TM3:
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Normalized Difference Vegetation Index (NDVI):
This is a commonly use vegetation index which uses the red and
infrared bands of the EM spectrum.
NDVI = (NIR-Red)/(NIR+Red)
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Normalized Difference Vegetation Index (NDVI):
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Display a histogram of a vegetated area
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ROI Selection
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Display a histogram of a vegetated area
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MERIS is a programmable, medium-spectral
resolution, imaging spectrometer operating in the
solar reflective spectral range. Fifteen spectral
bands can be selected by ground command.
The instrument scans the Earth's surface by the so
called "push-broom" method. Linear CCD arrays
provide spatial sampling in the across-track
direction, while the satellite's motion provides
scanning in the along-track direction.
MERIS is designed so that it can acquire data over
the Earth whenever illumination conditions are
suitable. The instrument's 68.5° field of view around
nadir covers a swath width of 1150 km. This wide
field of view is shared between five identical optical
modules arranged in a fan shape configuration.
From : http://envisat.esa.int/instruments/meris/
Meris
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MDS
Nr.
Band
centre
(nm)
Bandwidth
(nm)Potential Applications
1 412.5 10 Yellow substance, turbidity
2 442.5 10 Chlorophyll absorption maximum
3 490 10 Chlorophyll, other pigments
4 510 10 Turbidity, suspended sediment, red tides
5 560 10 Chlorophyll reference, suspended sediment
6 620 10 Suspended sediment
7 665 10 Chlorophyll absorption
8 681.25 7.5 Chlorophyll fluorescence
9 705 10 Atmospheric correction, red edge
10 753.75 7.5 Oxygen absorption reference
11 760 2.5 Oxygen absorption R-branch
12 775 15 Aerosols, vegetation
13 865 20 Aerosols corrections over ocean
14 890 10 Water vapour absorption reference
15 900 10 Water vapour absorption, vegetation
Meris Spectral Bands
http://www.brockmann-consult.de/cms/web/beam/meris-products
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Meris False Colour Composite:
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Meris False Colour Composite:
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Meris False Colour Composite:
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False Colour Composite BEAM defaults:
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False Colour Composite BEAM defaults:
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False Colour Composite BEAM defaults:
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False Colour Composite BEAM defaults:
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False Colour Composite BEAM defaults:
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BEAM default MERIS NDVI function:
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BEAM default MERIS NDVI function:
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BEAM default MERIS NDVI function:
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BEAM default MERIS NDVI function:
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BEAM default MERIS NDVI function:
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Use of Masks
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Meris cloud probability processor
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Meris cloud probability processor
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Image reprojection
Map projection: this step allows to go from geographic coordinates to some
specific cartographic projection as Lambert, Mercator or UTM.
For maps of the Earth, a projection consists of a graticule of lines representing
parallels of latitude and meridians of longitude or a grid.
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Image reprojection
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Image reprojection
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Image reprojection
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Image reprojection
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Image reprojection
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Orthorectification is the process by which the geometric distortions of
the image are modeled and accounted for, resulting in a planimetricly
correct image. To put it another way, our 3D world is imaged by most
sensors in 2D and orthorectification corrects for many of the anomalies
resultant from this conversion. Orthorectified imagery is particularly
useful in areas of the world with exacerbated terrain features such as
mountains, plateaus, etc.
The orthorectification process yields map-accurate images which can
be highly useful as base maps and may be easily incorporated into a
GIS. The success of the orthorectification process depends on the
accuracy of the DEM and the correction formulae. In the case of the
data provided by GLCF, the most accurate publicly available DEM was
used and an RMS error of 50 meters or better can be expected.
Image Orthorectification
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Image Orthorectification
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Image Orthorectification
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Image Orthorectification
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Image Orthorectification