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Luk

Coordinates

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I have a several hundred boreholes in national coordinates. Do I need to convert them into the UTM? Is it possible for Rockworks to work with another coordinate system?

Thanks

Luk

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Hi Luk,

RockWorks can work in any coordinate system, but if you are calculating volumes, it is a good idea to use the same units for the X, Y, and Z coordinates.

If you are working with areas, it is a good idea to use a Cartesian XY coordinates with units in feet or meters. You can start with longitude and latitude coordinates and use the program to convert to UTM feet or meters.

If you are combining maps from other sources, make sure all maps and data use the same coordinate system.

I have included some notes from the RockWorks help file below.

Thanks,

Tom B

[email protected]

Easting and Northing Notes

In the Borehole Manager, well location Easting (X) and Northing (Y) coordinates may be listed in global units (UTM) or in local units (meters or feet). Note the following:

  • It's important that the location coordinates be declared in the same units in which the depths are recorded. Thus, if your depths are entered in feet, so must be your Eastings and Northings. If your depths are entered in meters, then enter your Eastings and Northings in meters also. Why? Because when solid or isopach volumes are computed, the units will match (a cubic foot makes more sense than cubic degree-feet).
  • RockWorks assumes you know what your units are - feet or meters or inches or centimeters - and as long as they are consistent (as described above) you do not need to declare them anywhere in the program. You can adjust the text that is plotted along map borders to specify the units (map border settings), and you can adjust some of the program's different report settings, to specify your units, in the report options windows.
  • If your location coordinates are in decimal longitude and latitude units (such as "-106.89765" or "42.574635"), you should enter these coordinates in the longitude and latitude prompts in the Optional Fields section of the Location tab. Then use the Borehole Manager's Map / Adjust Coordinates / Longitude/Latitude -> Easting/Northing command to change them to UTM meters or feet.
  • If your location coordinates are in Range/Township/Section notation, you should enter the Range, Township, Section, Description, and Meridian information in the appropriate prompts in the Optional Fields section of the Location tab. Then use the Borehole Manager's Map / Adjust Coordinates / Jeffersonian -> Easting/Northing command to change them to UTM meters or feet. See the discussion of that topic for details about how to enter the Range, Township, Section, and location data.
  • The Easting and Northing coordinates must comply with a Cartesian coordinate system in which the X-coordinates or Eastings must increase in value to the East, and the Y-coordinates or Northings must increase in value to the North. If you are using lon/lat coordinates for translation to meters or feet, be sure that western longitudes and southern latitudes are entered as negatives.

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