Winzip files 'GPR2009-1GridsGRD.zip' and 'GPR2009-1GridsERS.zip' each contain all grids for this publication. Unzipped file names, minus extensions, include:----------------------------------------------------------------------
SlateCk-magigrf - Total magnetic field with IGRF removed SlateCk-cvg - Calculated vertical gradient (first vertical derivative) of the total magnetic field with IGRF removed SlateCk-res56k - Apparent coplanar resistivity for 56,000 (56k) Hz SlateCk-res7200 - Apparent coplanar resistivity for 7200 Hz SlateCk-res900 - Apparent coplanar resistivity for 900 Hz SlateCk-dtm - Digital terrain/elevation model
Winzip files 'GPR2009-1LinedataXYZ.zip' and 'GPR2009-1LinedataGDB.zip' each contain the raw and processed linedata database for this publication. Unzipped file names include:----------------------------------------------------------------------
SlateCkLinedata.txt - Supplemental text including channel names, short definition, number of decimal places, and similar items; this information is also included elsewhere in this metadata file SlateCkLinedata.GDB - Geosoft binary database format SlateCkLinedata.XYZ - Geosoft ASCII database format
The winzip file 'GPR2009-1Vectors.zip' contains all vector files for this publication.----------------------------------------------------------------------
SlateCk-magigrf - Contours of gridded data (total magnetic field with IGRF removed) SlateCk-res56k - Contours of gridded data (56k Hz apparent coplanar resistivity) SlateCk-res7200 - Contours of gridded data (7200 Hz apparent coplanar resistivity) SlateCk-res900 - Contours of gridded data (900 Hz Apparent coplanar resistivity) SlateCk-fp - Flight path SlateCk-SecGrid - Slightly modified Alaska PLSS Section Grid for the map areas.
Winzip files 'GPR2009-1MapsAsPDF.zip' and 'GPR2009-1MapsAsHPGL2' each contain all the maps for this publication. Map types are listed below; file names are provided in the Entity_and Attribute_Overview Section for maps and the associated Detailed_Description.
Total magnetic field, IGRF removed ('magigrf') First vertical derivative of 'magigrf' 56,000 Hz coplanar apparent resistivity 7200 Hz coplanar apparent resistivity 900 Hz coplanar apparent resistivity
Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2009, Line, grid, and vector data, and maps for the airborne geophysical survey of the Slate Creek-Slana River Survey, Chistochina mining district, south-central Alaska: Geophysical Report GPR 2009-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Figure 1. General location of the survey area within Alaska. Figure 2. Location of the survey area showing 1:63,360-scale map sheet locations, towns, and roads. Figure 3. Total magnetic field, IGRF removed Figure 4. First vertical derivative of the total magnetic field, IGRF removed Figure 5. 56,000 Hz coplanar apparent resistivity Figure 6. 7200 Hz coplanar apparent resistivity Figure 7. 900 Hz coplanar apparent resistivity Figure 8. Digital elevation model
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 25
Ordinates (y-coordinates) are specified to the nearest 25
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
The line type, and the basic line number and associated flight segment are in the format of 'X43210'.
-------------------------------------------------------------
1. 'X' = Line Type where:
> L for normal (traverse) lines; oriented nominally NW-SE (350 degrees).
> T for tie and border (boundary) lines; tie lines oriented nominally NE-SW (80 degrees); border lines occur around the outline border where traverse or tie lines are not parallel to the outline.
-------------------------------------------------------------
2. '43210' represents the basic line number, designated before flying, and always ends in a multiple of '10'. In general, the traverse lines increase by 10 from west to east, e.g. 10040, 10050, 10060; the tie lines increase by 10 from north to south; and the border lines increase by 10 in general from northwest to southeast.
Line numbers used in this project include:
> a. Traverse lines 10010 (west) to 11510 (east);
> b. Tie lines 19010 (north) to 19130 (south);
> c. Boundary lines 19140 (northwest) to 19570 (southeast).
-------------------------------------------------------------
3. The fifth digit in '43210' represents the flight segment along a single traverse, tie, or border line. The fifth digit for the initial flight segment is '0', and is increased by '1' for each successive flight segment along the line, e.g., 10040, 10041, 10042, 10043. Numerous flight segments along a line are often required because of long line length, weather, refueling, active diurnal, other 'out-of-spec' data, and other items. The flight segments along a line may be in any spatial order, and may not have the same flight number (FN).
Range of values | |
---|---|
Minimum: | 593502.37 |
Maximum: | 664271.79 |
Units: | m |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 6961570.98 |
Maximum: | 7013846.19 |
Units: | m |
Resolution: | 0.01 |
The attribute measurement resolution is 0.1 second. The values increase from the beginning of a flight to the end. Only FIDS during production flights are included in the database.
Range of values | |
---|---|
Minimum: | -145.1434951 |
Maximum: | -143.7800693 |
Units: | degrees |
Resolution: | 0.0000001 |
Range of values | |
---|---|
Minimum: | 62.754901 |
Maximum: | 63.2422932 |
Units: | degrees |
Resolution: | 0.0000001 |
Range of values | |
---|---|
Minimum: | 16002 |
Maximum: | 16034 |
Units: | flight |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 09/15/2008 |
Maximum: | 10/11/2008 |
Units: | day |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | -18.21 |
Maximum: | 294.76 |
Units: | m |
Resolution: | 0.3 |
Range of values | |
---|---|
Minimum: | 792.60 |
Maximum: | 2360.20 |
Units: | m |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 717.32 |
Maximum: | 2201.89 |
Units: | m |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 56593.577 |
Maximum: | 56681.796 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -57.324 |
Maximum: | 30.896 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 55055.66 |
Maximum: | 73302.52 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 55055.66 |
Maximum: | 73302.52 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 55054.20 |
Maximum: | 73294.98 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 56834.09 |
Maximum: | 56937.79 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -1850.22 |
Maximum: | 16449.20 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | 55031.78 |
Maximum: | 73331.20 |
Units: | nT |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -2132.01 |
Maximum: | 166.22 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -2.69 |
Maximum: | 279.69 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -507.33 |
Maximum: | 66.65 |
Units: | ppm |
Resolution: | 0.06 |
Range of values | |
---|---|
Minimum: | -4.96 |
Maximum: | 79.53 |
Units: | ppm |
Resolution: | 0.06 |
Range of values | |
---|---|
Minimum: | -502.13 |
Maximum: | 152.32 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -11.95 |
Maximum: | 182.01 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -1847.95 |
Maximum: | 664.94 |
Units: | ppm |
Resolution: | 0.24 |
Range of values | |
---|---|
Minimum: | -2.86 |
Maximum: | 732.99 |
Units: | ppm |
Resolution: | 0.24 |
Range of values | |
---|---|
Minimum: | -1869.29 |
Maximum: | 1382.69 |
Units: | ppm |
Resolution: | 0.60 |
Range of values | |
---|---|
Minimum: | -10.90 |
Maximum: | 1765.53 |
Units: | ppm |
Resolution: | 0.60 |
Range of values | |
---|---|
Minimum: | -2132.01 |
Maximum: | 163.29 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -2.23 |
Maximum: | 279.69 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -507.07 |
Maximum: | 66.6 |
Units: | ppm |
Resolution: | 0.06 |
Range of values | |
---|---|
Minimum: | -2.78 |
Maximum: | 79.53 |
Units: | ppm |
Resolution: | 0.06 |
Range of values | |
---|---|
Minimum: | -502.13 |
Maximum: | 152.15 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -4.01 |
Maximum: | 182.01 |
Units: | ppm |
Resolution: | 0.12 |
Range of values | |
---|---|
Minimum: | -1847.95 |
Maximum: | 665.52 |
Units: | ppm |
Resolution: | 0.24 |
Range of values | |
---|---|
Minimum: | -0.63 |
Maximum: | 732.99 |
Units: | ppm |
Resolution: | 0.24 |
Range of values | |
---|---|
Minimum: | -1869.29 |
Maximum: | 1384.18 |
Units: | ppm |
Resolution: | 0.60 |
Range of values | |
---|---|
Minimum: | 1.22 |
Maximum: | 1765.53 |
Units: | ppm |
Resolution: | 0.60 |
Range of values | |
---|---|
Minimum: | 7.98 |
Maximum: | 1325.00 |
Units: | ohm-m |
Resolution: | 0.1 |
Range of values | |
---|---|
Minimum: | 12.83 |
Maximum: | 10750.00 |
Units: | ohm-m |
Resolution: | 0.24 |
Range of values | |
---|---|
Minimum: | 5.2 |
Maximum: | 60000.00 |
Units: | ohm-m |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -150.33 |
Maximum: | 227.86 |
Units: | m |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -156.07 |
Maximum: | 115.02 |
Units: | m |
Resolution: | 0.1 |
Range of values | |
---|---|
Minimum: | -172.82 |
Maximum: | 77.69 |
Units: | m |
Resolution: | 0.1 |
Range of values | |
---|---|
Minimum: | -159.468 |
Maximum: | 152.317 |
Units: | unitless |
Resolution: | 0.1 |
Range of values | |
---|---|
Minimum: | -35.594 |
Maximum: | 59.620 |
Units: | unitless |
Resolution: | 0.1 |
Range of values | |
---|---|
Minimum: | 0.0000122 |
Maximum: | 0.0011785 |
Units: | unitless |
Resolution: | 0.0000001 |
Range of values | |
---|---|
Minimum: | 0.0000001 |
Maximum: | 0.0012683 |
Units: | unitless |
Resolution: | 0.0000001 |
Range of values | |
---|---|
Minimum: | 0.0002033 |
Maximum: | 0.0030306 |
Units: | unitless |
Resolution: | 0.0000001 |
grid file; magnetic value in nanoTeslas (nT)
grid file; dz in nT/m
grid file; apparent resistivity in ohm-m
grid file; apparent resistivity in ohm-m
grid file; apparent resistivity in ohm-m
grid file; elevation in meters
vector file containing lines and vector 'numbers'
vector file containing lines and vector 'numbers'
vector file containing lines and vector 'numbers'
vector file containing lines and vector 'numbers'
vector file containing lines and text
vector file containing lines and text
GPR 2009-1-1A. Total magnetic field of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle: 1 sheet, scale 1:63,360, topography included. GPR 2009-1-1B. Total magnetic field of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-2A. Total magnetic field of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, magnetic contours included. GPR 2009-1-2B. Total magnetic field of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, magnetic contours included. GPR 2009-1-3A. First vertical derivative of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-3B. First vertical derivative of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-4A. 56,000 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-4B. 56,000 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-5A. 56,000 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, 56,000 Hz apparent resistivity contours included. GPR 2009-1-5B. 56,000 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, 56,000 Hz apparent resistivity contours included. GPR 2009-1-6A. 7200 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-6B. 7200 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-7A. 7200 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, 7200 Hz apparent resistivity contours included. GPR 2009-1-7B. 7200 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, 7200 Hz apparent resistivity contours included. GPR 2009-1-8A. 900 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, Includes topography GPR 2009-1-8B. 900 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, topography included. GPR 2009-1-9A. 900 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, part of Mt. Hayes Quadrangle; 1 sheet, scale 1:63,360, 900 Hz apparent resistivity contours included. GPR 2009-1-9B. 900 Hz coplanar apparent resistivity of the Slate Creek - Slana River area, Chistochina mining district, southcentral Alaska, parts of Gulkana and Nabesna quadrangles; 1 sheet, scale 1:63,360, 900 Hz apparent resistivity contours included.
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
map in PDF and HPGL/2 format
Funding was provided by the Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.
The survey was part of the Alaska Airborne Geophysical/Geological Mineral Inventory project funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The project seeks to catalyze private-sector mineral development investment. The project delineates mineral zones on Alaska state lands that: 1) have major economic value; 2) can be developed in the short term to provide high quality jobs for Alaska; and 3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue.
Akima, H., 1970, A new method of interpolation and smooth curve fitting based on local procedures: Journal of the Association of Computing Machinery v. 7, no. 4.Online Links:
- None
Data sources used in this process:
Data sources used in this process:
Geophysical data were acquired during an airborne survey. The magnetometer used had a sensitivity of 0.01 nT. Resistivity sensitivity varies among the different frequencies from 0.06 ppm to 0.30 ppm. Survey contracts specified the conditions and specifications under which these data were collected. Altimeter, heading, lag, and frequent EM calibrations were done. More information will be available in the project report to be published fall 2009.
The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m.
The radar altimeter ('ALTRAD_BIRD') had a stated resolution of 0.3 meter, and an accuracy better than 10% of the flying height, i.e. better or equal to 3 meters for this survey. The ALTRAD_BIRD value may be erroneous in areas of heavy tree cover, where the altimeter reflects the distance to the tree canopy rather than the ground.
The database includes files that contain raw and processed aeromagnetic electromagnetic, altimetry, and locational data for the survey area. Areas with no data for a given channel are flagged with the dummy variable (*). These represent 1) sampling differences, e.g., most sampling was 10 samples per second, but the diurnal_filt channel was sampled once per second; 2) magnetic lag shift at the end of a line, and spikes and dropouts in the magnetic reading; and 3) resistivity and depth values that are not calculated because flying height was too high to produce meaningful calculations. The linedata file includes 48 channels (not including flight line number) for each of the 221 flight lines. A total of 1,357090 data locations are included. The channels are listed below showing number of data points filled with data and those filled with dummies.
-------------------------------------------------------------Except for the 4 missing mag_raw values, the missing mag_lag, mag_diu, mar_rmi, and magigrf are due to lag correction; these locations are outside of the contracted survey bounds. Missing values in the apparent resistivity (res56k, res7200, and res900) and associated calculated 'depth' (dep56k, dep7200, and dep900) are due to calculations being meaningless, generally caused by increase in altitude.
Channel # of # of Name Points Dummies X 1357090 0 Y 1357090 0 fid 1357090 0 latitude 1357090 0 longitude 1357090 0 flight 1357090 0 date 1357090 0 altrad_bird 1357090 0 gpsz 1357090 0 dtm 1357090 0 diurnal_cor 1357090 0 igrf 1357090 0 cpi900_filt 1357090 0 cpq900_filt 1357090 0 cxi1000_filt 1357090 0 cxq1000_filt 1357090 0 cxi5500_filt 1357090 0 cxq5500_filt 1357090 0 cpi7200_filt 1357090 0 cpq7200_filt 1357090 0 cpi56k_filt 1357090 0 cpq56k_filt 1357090 0 cpi900 1357090 0 cpq900 1357090 0 cxi1000 1357090 0 cxq1000 1357090 0 cxi5500 1357090 0 cxq5500 1357090 0 cpi7200 1357090 0 cpq7200 1357090 0 cpi56k 1357090 0 cpq56k 1357090 0 difi 1357090 0 difq 1357090 0 cxsp 1357088 2 cpsp 1357087 3 mag_raw 1357086 4 cppl 1357070 20 res900 1355845 1245 res7200 1355845 1245 res56k 1355845 1245 mag_lag 1353108 3982 mag_diu 1353108 3982 mag_rmi 1353108 3982 magigrf 1353108 3982 dep56k 1298859 58231 dep7200 1141195 215895 dep900 458759 898331 diurnal_filt 135706 1221384
Data for this survey were collected by a single subcontractor (Fugro Airborne Surveys) who was responsible for collecting and processing the data. All the data were collected with the same instruments (magnetometers, electromagnetic bird and sensors, altimeters, and navigational system). Fugro's internal project reference number for the Slate Creek-Slana River survey is '08046'and their internal media reference number for this publication (v 1.0) is 'CDVD00387'.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Use_Constraints:
- Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS).
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Geophysical Report 2009-1
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Maps from current publication are available on paper or Mylar. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
Data format: | Geosoft binary float (GRD) (version Unknown) |
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Data format: | Geosoft binary database (GDB) (version Unknown) |
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Data format: | Geosoft ASCII (XYZ) (version Unknown) |
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<http://dx.doi.org/10.14509/19621> |
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Digital files on DVD are available for $10 plus shipping; currently, only the maps can be downloaded from our web site (<http://www.dggs.alaska.gov>) and are in PDF format. No fees charged for downloaded files.
Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: cash, check, money order, VISA, or MasterCard. The geophysics page of the DGGS web site (<http://www.dggs.alaska.gov/pubs/geophysics>) has geophysical order forms for this project and others.
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Custom views or processing may be requested. Please contact Laurel Burns by phone (907-451-5021), e-mail (laurel.burns@alaska.gov), or fax (907-451-5050) to discuss custom processing availability, fees, and turnaround time.
Software with ability to use, import, or convert Geosoft float GRD, binary GDB, and ASCII XYZ files, Autocad DXF files, Adobe Acrobat PDF, and text files. Free downloadable interfaces for converting the gridded and dxf files are available at the Geosoft Web site (<http://www.geosoft.com>; Oasis Montaj viewer), and the ER Mapper Web site (<http://www.ermapper.com>). Freeware software 'printfile' (<http://www.lerup.com/printfile/>) prints HPGL/2 files easily on compatible printers. The HPGL/2 files have brighter colors and sharper topography than the PDF maps. Maps are viewable digitally only with the PDF format, and of course may also be printed.
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