Peaks and Depressions Layer General Properties

To edit a peaks and depressions map, click once on map layer to select it. The properties for the peaks and depressions map are displayed in the Properties window. The peaks and depressions properties General page contains the following options:

Change peaks and depressions layer properties in the Properties window on the General page.

General

Grid File

The Grid file displays the path and file name for the grid file used for the map. If the entire file name is not shown, place the mouse over the file name. A small window will appear with the full path and name displayed.

Grid Information

The button displays information about the grid file used to produce the map layer. The information includes the grid size, the minimum and maximum X, Y, Z, and C values contained in the grid file, and statistics. If the grid file contains more than 40 million nodes, you are asked if you wish to create a detailed report or a quick report. Click Yes in the message to create a detailed grid report, or click No to create a shorter quick grid report.

Change File

The button displays the Open Grid dialog. This allows you to select a new grid file, or an updated version of the grid file used to create the contour map. Select a grid file and click Open. If the Z range for the new grid is outside the old contour levels, you will be prompted to continue the operation. If you clickCancel, the grid file is not replaced. If you clickOK, the grid file is replaced, but no contour lines are drawn. You can update the contour levels being displayed on theLevelstab.

If the new grid exceeds the current map limits, another warning will appear asking you to adjust the map limits. If you click Yes, the limits are automatically adjusted to fit the new grid. If you click No, the limits are not automatically adjusted. The map may not be displayed. To change the map limits, click on the Map object in the Contents window and the Limits tab in the Properties window.

You may also see a warning message that the current map scale may result in an un-viewable map. Clicking OK allows the map scale to automatically be adjusted.

Coordinate System Note:

Regardless of the file selected with either the Map Tools | Reload | Map Data command or by clicking the button in the Properties window, the coordinate system for the original map layer is used after updating the file. If this is not the correct coordinate system, click on the map layer to select it. In the Properties window, click on the Coordinate System tab and set the coordinate system to the appropriate new system.

Save File

The button displays the Save Grid As dialog. Type a File name and change the Save as type to the desired grid file format. Click Save. If a coordinate system has been defined on the Coordinate System tab in the Properties window, an Export Options dialog appears. Check the desired file formats. It is recommend that GS Reference (Version 2) file option be checked to generate a .GSR2 file. Click OK and the file is saved.

If the map layer was created using a 3D grid, only 3D grid file formats (HDF, VTK, etc) will be available in the Save as type field.

Grid Type

The Grid type field tells the user whether a 2D grid or 3D grid was used to create the map layer. This field is informational only.

Slice Z Value

The Slice Z value defines which horizontal slice of a 3D grid file is mapped. Click on the current value and enter a specific number to view the results for a that horizontal slice. Click and drag the slider to see the mapped results change as the slice value changes.

By default, Surfer will select a Z value near the middle of the range as the Slice Z value.

Save Slice

The Save Slice command saves the current horizontal slice of a 3D grid as a 3D grid file.

Click the button to display the Save Grid As dialog. Type a File name and change the Save as type to the desired grid file format. Click Save. If a coordinate system has been defined on the Coordinate System tab in the Properties window, an Export Options dialog appears. Check the desired file formats. It is recommend that GS Reference (Version 2) file option be checked to generate a .GSR2 file. Click OK and the file is saved.

Display Data

Display either All local highs/lows or the Maximum high/Minimum low.

Report

Click Create Report to run a report of statistics of the peak and depression areas. Statistics are only included for peaks and or depressions displayed on the map. In the Peaks and Depressions Report Options dialog enter the appropriate number if the Z dimension is in different units than the X and Y dimensions. The default is 1. The statistics can be saved or printed when opened in the report window.

If a 3D grid file was used to create the peaks and depressions layer, the units and results of the report will be based on the X, Y, and C dimensions.