Updates:
January 28, 2008: Added new
tools and SpecTIR Hyperspectral imagery for analysis and download to the
Image Analysis Toolbox (IAT). The hyperspectral data was provided by
SpecTIR LLC and funded by a grant from
Geoscience BC (Project
2006-032). The Hyperspectral Imagery Demonstration Project includes
hyperspectral imagery over six sites in south central BC. The sites were
selected to include a variety of typical BC conditions and deposit types.
These sites (flight lines S1-10) include two producing mines (Gibraltar S2-4
and Mount Polley S5-7), a past producer (Blackdome S9), several active
exploration projects (Limonite S10 and Prosperity S1) and a vegetated site
(Lang Lake S8) with interesting geological features. The imagery samples the
electromagnetic spectrum between 0.4 and 2.45 micrometres with 178 bands of
approximately 10 nanometres width and a ground sample spacing of
approximately 2.5 metres. The existing IAT tools are fully functional for
hyperspectral data. The SpecTIR Hyperspectral imagery is available for
download as hyperspectral data cubes in either reflectance or radiance
values, with orthorectification lookup tables.
Two new capabilities were added to the IAT to enhance its
analysis capabilities. These new capabilities can be used with the Landsat,
ASTER, and SpecTIR datasets. The ability to view the spectrum from a
specific image pixel or a sample from the
USGS Mineral Spectral
Library has been added to the Spectral Angle Mapper (SAM) tool. The
detailed spectra contained within this library have been resampled to
correspond to Landsat, ASTER and SpecTIR bandwidths. The
John Hopkins University (JHU)
Spectral Library is also available in the SAM tool for ASTER images.
The project and use of the new tools and imagery are
described in Summary of Activities 2007,
Report 2008-1 and released as Geoscience BC
Report 2008-2: Hyperspectral
Imagery Demonstration Project. Cal Data Ltd. performed the project with a
grant from Geoscience BC.
November 23, 2007: Added KML File
to
ASTER Download
pages.
May 2, 2007: Added
Question and Answer section.
February
16, 2007: Added Geoscience BC ASTER Workshop
Notes, including a new Google Earth
Video
Tutorial on the Nelson area. Published anaglyph downloads and Google
Earth files for
ASTER images (200-299).
January 29, 2007:
Added
100 new ASTER images (200-299) for a total of 239 images. See
Geological Fieldwork
2006, pages 315-318 for details:
Kilby, W.E. and Kilby, C.E.:
ASTER
Multispectral Satellite Imagery and Product Coverage, BC –
Phase 2
(PDF document, 338 Kb).
January 17, 2007:
Added ASTER Workshop Excel file
(200K), which contains modified laboratory spectra of rocks and minerals
from the ASTER Spectral Library. The spectra have been sampled with the
ASTER response curves using ENVI to generate the expected Aster spectra. The
individual workbook sheets hold data from the USGS and John Hopkins
libraries in same subsets as contained in the data release. This files
was used in the
Geoscience BC ASTER Workshop.
See also Exploring the MapPlace
- Workshop Notes.
July 25, 2006: Added
Video
Tutorials to
GeoFile 2006-8 IAT
Tutorial Manual and Exploring the MapPlace
- Workshop Notes.
June 5, 2006: Added
GeoFile 2006-8:
Examining ASTER Imagery with the MapPlace Image Analysis Toolbox - A
Tutorial Manual, by W.E. Kilby and C.E. Kilby, Cal Data Ltd.
Geoscience BC Report 2006-3 Contribution #GBC 015.
March 29,
2006: Added a new interactive masking feature
to ASTER image tools (ASTER MASKER).
February 14,
2006: ASTER
Download layer, with labels, and toggle button
added to IAT. Added a table of
ASTER Images
Available for Download; see
Index Map.
February 8,
2006: Added Alteration-Mineral Images
to the ASTER Image Download page in the Image Analysis Tool. Four
alteration-mineral images are available in PNG format with PGW world files.
These images were produced using standard combinations of the ASTER bands.
The four images can be used to map the relative abundance of siliceous
rocks, iron oxides, sericite and illite, and alunite and/or kaolinite. See
the Fieldwork 2005
article for processing information on these images. The images are in UTM
projection. As the colour scaling is unique to each image, the colours
should not be compared between images.
January
23, 2006:
In Phase 3, the IAT was enhanced with the addition of 100 new ASTER images.
A new "Rocks Only" tool for identifying Iron-oxides, Silica, Sericite-Illite,
and Alunite-Kaolinite was added. The imagery is also available with
accompanying 3D anaglyph
maps, Digital Elevation Models, stereo image pairs, and virtual worlds
(VRML) user controlled fly-throughs. See
Fieldwork 2005,
p. 287-294 for details. Phase 3 was
available through funding from a
Geoscience BC project -
ASTER
Imagery.
January 24, 2005:
In Phase 2, the IAT was completed with the
addition of more analysis tools, imagery and imagery types. Near-complete
coverage of the province with Landsat 7 (ETM+) imagery and 40 ASTER images
are now available. Two new tools, the Tasseled Cap Transformation and the
Spectral Angle Mapper (SAM) were added. Program enhancements were also made
to the existing IAT programs to increase their efficiency and capability.
See Fieldwork 2004,
p. 231-235 for details.
July 15, 2004: Added
48 new Landsat images (L21 –
L68), covering most of BC. These images are
available for processing using the IAT. They are not yet available as enhanced downloads.
View
Exploration Assistant and select Image Analysis Toolbox (IAT)
Image Analysis Links and References:
Kalinowski, A. and S. Oliver (2004):
ASTER Mineral Index
Processing Manual, Remote Sensing Applications, Geoscience Australia,
October 2004
Kilby, W.E., Kliparchuk, K., and McIntosh, A.
(2004): Image
Analysis Toolbox and Enhanced Satellite Imagery Integrated into the MapPlace;
British Columbia Ministry of Energy and Mines, Geological Fieldwork 2003,
Paper 2004-1, p.209-215
Kilby, W.E. (2005):
MapPlace.ca Image Analysis
Toolbox – Phase 2; British Columbia Ministry of Energy and Mines,
Geological Fieldwork 2004, Paper 2005-1, p.231-235
Kilby, W.E. and Kilby, C.E. (2006):
ASTER Imagery for BC – An
Online Exploration Resource; British Columbia Ministry of Energy, Mines
and Petroleum Resources, Geological Fieldwork 2005, Paper 2006-1, p.287-294
Kilby, W.E. and Kilby, C.E. (2006):
Examining ASTER
Imagery with the MapPlace Image Analysis Toolbox - A Tutorial Manual;
British Columbia Ministry of Energy, Mines and Petroleum Resources, GeoFile
2006-8 / Geoscience BC Report 2006-3, 41 p.
Lillesand, T.M. and Kieffer, R.W. (2000):
Remote Sensing and Image Interpretation; 4th ed., Wiley, New York, 724
pages.
Questions and Answers:
-
I would like to use the aster alteration
images in my software but it doesn't accept PNG files. When I convert to
TIFF, how do I keep the geographic information.
Once you have converted the PNG files
to tiff then rename the associated *.pgw file to *.tfw. That should pass
the pixel size and image position to your software. You will have to
tell it which UTM zone the image is in (11 to 7). All these images are
in UTM NAD83 projection.
-
What do the the colour scales represent.
The colour schemes are not fixed on
the images and were selected only to show an increasing favourability.
No effort was made to standardize between images due to the differences
in acquisition times and environmental conditions. These images are a
very cursory pass at mapping the mineral character of the image.
The names are associated with the
particular band combination that had shown good results for other
workers. So for instance the Fe-oxide image based on Band2/Band1 is
really just showing that band combination which in many cases has
correlated well with iron bearing minerals. But in many areas of BC it
also picks up cellulose very well so dry grass shows high.
