Gravity Images for Northern Mainland Nova Scotia by 1:50 000
NTS Mapsheet
DP ME 118, Version 2, 2006, Bouguer Gravity
and Residual Bouguer Gravity Images for individual 1:50 000
NTS sheets 11E/05, 11E/06, 11E/07, 11E/08, 11E/09, 11E/10,
11E/11, 11E/12, 11E/16, 11F/05, 11F/12, 11F/13, 21H/07, 21H/08
and 21H/09, TGI-2 project, northern mainland Nova Scotia,
by M.S. King, 2004. Available in TIFF and JPEG formats, and
also PDF's of OFM ME 2005-60 to 89.
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DP ME 111
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Abstract
This data set consists of 15 TIFF images, 15 JPEG images, and 15 PDF Open File Maps of Bouguer
gravity and residual Bouguer gravity for each of 15 1:50 000 NTS
sheets that covers most of northern mainland Nova Scotia.
The total field Bouguer gravity and residual Bouguer gravity data
used to produce these images were provided by the Nova Scotia Department
of Natural Resources 1701 Hollis Street, Halifax, Nova Scotia, B3J
2T9 and extracted by King (OFR-2004). Gravity points include national
gravity net stations (5 km station spacing) and more detailed industry
and government stations (235 m nominal station spacing). Given that
gravity station spacing is variable throughout the NTS sheet there
may be related artefacts present in the final gridded product. Regional-residual
data separation was completed on the grid product by subtracting
a second grid consisting of a 1st or 2nd-order polynomial surface
calculated from the original Bouguer gravity total field grid. Residual
gravity data consist of shorter wavelength signals (e. g. < 6-10
km ) that correspond to more shallow geological sources. The 24-bit
colour images was derived from a 100 m grid product with a 1000
m extrapolation limit and has a 10 m pixel size. Shading was from
the south at 35 degrees above the horizon. For complete details
an Open File Report will be forthcoming from M. S. King later in
2004.
The images were produced by contractor M. S. King using funds
provided under the Natural Resources Canada and Nova Scotia Department
of Natural Resources joint project 'Mapping, Mineral and Energy
Resource Evaluation, Central Nova Scotia', part of Natural Resources
Canada's Targeted Geoscience Initiative (TGI-2) 2003-2005. |
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The information on the PDF map comes from a variety of government and non-government
sources. NSDNR accepts no liability for any errors or deficiencies on this map.
This map should not be used for legal purposes.
The PDF map is intended for use at the published scale of 1:50 000.
The DATA is provided to the USER on an "as is" basis, without warranties of any kind, express
or implied. The entire risk as to the quality and accuracy of the DATA is with the USER and the USER shall
use his/her own judgment in making use of the DATA or drawing conclusions based upon it. DNR shall not be
liable to the USER, his/her clients, servants, agents, contractors, assigns, or to any other person for any
loss or damage of any kind including personal injury or death arising from the use of the DATA or
accompanying written materials, or from errors, deficiencies or faults therein, whether such damage is
caused by negligence or otherwise. If errors or omissions are found in the DATA, the USER will notify DNR.
The terms and conditions of the license accompany the downloaded digital product.
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A Sample Gravity Image (Bouguer Gravity)
(Sample image - Click to view details in a smaller area)
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| Format |
Portable Document Format (PDF),
Tag Image File Format (TIFF), Joint Photographic Experts Group (JPEG) and TXT files compressed
in self-extracting EXE/ZIP files (more information on
data formats) |
| Size |
PDF - 1.2 MB to 4.6 MB (compressed), 1.4 MB to 5.6 MB (uncompressed)
TIFF - 0.7 MB to 1.5 MB (compressed), 39.5 MB to 48.0
MB (uncompressed)
JPEG - 0.5 MB to 1.0 MB (compressed), 0.6 MB to 1.1
MB (uncompressed) |
| Projection |
The TIFF and JPEG images are in six-degree Universal
Transverse Mercator (UTM) projection, Zone 20, Central
Meridian 63° 00' West using the North American Datum
of 1983 (NAD83).
The PDF maps are are in six-degree Universal Transverse Mercator
(UTM) projection, Zone 20, Central Meridian 63° 00'
West using the North American Datum of 1927 (NAD27). |
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Downloading Instructions
The data files have
been compressed using PKZIP into a single, self-extracting EXE file.
- Read the Licence before accepting the
data.
- Download the self-extracting EXE file to the desired location on your hard
drive.
- Double click or "RUN" the EXE file and the data files will be unzipped automatically.
The EXE file can also be opened in WinZip to view and extract the compressed
files in the data set.
On UNIX platforms, the unzip command
will extract the compressed files in the EXE.
A readme file and a copy of the licence agreement are also
included with each data set. |
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Download DP ME 118 |
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