Custom Coordinate Projections

When you create a new project in RockWorks, one of the parameters you must establish is the coordinate system your borehole locations represent. For the United States the most commonly selected datum is WGS-84 1984 (NAD-83). Another standard system we offer is US State Plane. RockWorks also offers a "local' system which can be any cartesian X, Y system.

But if your coordinates are not listed here - such as a UTM with a different datum, or one of the hundreds of projections outside the United States - do not worry. RockWorks offers hundreds of global coordinate projections, as well as the ability to define a custom projection for your project and data coordinates. This is offered through the "Proj4" set of codes. You can access these via the Other tab in all coordinate-selection windows.

• Other: Click in this radio button if you want to choose from an expanded list of projections.
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  • Set Projection: Use the drop-down list to define how to projection is to be picked.
    • Select from a List: Use this to select the projection from a long list, searchable by name or using "EPSG" codes. For example, if your coordinate system were the Israeli TM, you could type "Israel" into the search box, and select from the displayed results. Or you could type in the EPSG code "2039" to retrieve that item.
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    • Select from the master list: Use this to select the projection from an even longer list, searchable by name or using "EPSG" codes.
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    • Build/Edit a projection: Use this to hand-enter the projection parameters, or to build a custom projection based on an existing one.
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    • Display projection parameters: Click this to display the parameters of the currently-selected projection.
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    • Display expanded parameters: Click this to display expanded parameters of the current projection.
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    • Display Parameter string: Use this to display the parameter INIT string.
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  • Units: Choose from Feet (International), Meters, or Other
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Note:Proj4 assumes that feet means International feet, although you can set a custom parameter for something different:
+units=us-ft for U.S. Surveyor´s Foot
+units=ind-ft for Indian Foot

See also

• Defining Your Datasheet Coordinates
• Entering Borehole Location Data
• Coordinate Systems in RockWorks
• Converting Coordinates in the Datasheet
• Converting Coordinates in the Borehole Manager
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