Gravity Images for Northern Mainland Nova Scotia

DP ME 111, Version 2, 2006. Bouguer Gravity and Residual Bouguer Gravity Images Collectively Covering NTS Sheets 11E/01, 11E/02, 11E/03, 11E/04, 11E/05, 11E/06, 11E/07, 11E/08, 11E/09, 11E/10, 11E/11, 11E/12, 11E/13, 11E/14, 11E/15, 11E/16, 11F/04, 11F/05, 11F/12, 11F/13, 21H/01, 21H/02, 21H/07, 21H/08, 21H/09, 21H/10 and 21H/16, TGI-2 Project, Northern Nova Scotia

Abstract

This data set consists of one TIFF, one JPEG image and one PDF Open File Map of bouguer gravity and residual bouguer gravity covering most of northern mainland Nova Scotia.

The total field bouguer gravity and residual bouguer gravity map images were produced from data contained in Nova Scotia Department of Natural Resources, Open File Report ME 1995-005. Gravity station spacing is variable throughout the map sheet and artifacts related to station spacing may be present in the final map image. The total field data set contains the cumulative measured response from surface features to upper crustal sources. The residual gravity image was derived from the total field data by subtracting long-wavelength (~> 8-10 km) signal from the total field data to enhance near surface (< 5 km) features. Station spacing restricts grid cell size to 500 m with a 8000 m blanking distance, which restricts near surface spatial resolution in the published map image.

The 24-bit colour images were produced with a 25m pixel size. Shading was from the southeast 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.

Disclaimer

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.

A Sample Total Field Bouguer Gravity Image

(Sample image - Click to view details in a smaller area )

Sample Image

Format and Projection

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 - 11.0 and 11.4 MB (compressed), 13.4 and 13.8 MB (uncompressed)
TIFF - 10.8 and 11.1 MB (compressed), 250.9 MB (uncompressed)
JPEG - 4.0 and 4.1 MB(compressed), 4.1 and 4.2 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).

Downloading Instructions

The data files have been compressed using PKZIP into a single, self-extracting EXE file.

  1. Read the Licence before accepting the data.
  2. Download the self-extracting EXE file to the desired location on your hard drive.
  3. 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.

Download Digital Data Set DP ME 111