EVS Data Input & Output Formats

EVS Data Input & Output Formats

Input

EVS conducts most of its analysis using input data contained in a number of ASCII files.  These files can generally be created using the C Tech Data Exporter (free) application downloadable at www.ctech.com.  The Exporter will create C Tech's formats from from Microsoft Excel and Access files.  

Requirement for Consistent Coordinate Systems

Projecting File Coordinates

3D analyte (e.g. chemistry) (.apdv) Format

3D Groundwater analyte (e.g. chemistry) (.aidv) Format

analyte (e.g. chemistry) Time Files (.sct and .gwt) Format

Handling Non-Detects

Pre-Geology File Format

Borehole (.geo) Geology Format

Geology File Example: Sedimentary Layers and Lenses

Geology File Example: Outcrop of Dipping Strata

Geology Multi-File (.gmf) Format

Geology Files for Fence Diagrams

Time Control File (TCF)

EVS Field File Formats (.eff, .efz & .efb)

.apdv, .aidv and .pgf files can be used to create a single geologic layer model. This is not preferred alternative to creating/representing your valid site geology. However, most sites have some ground surface topography variation. If krig_3d is used without geology input, the resulting output will have flat top and bottom surfaces. The flat top surface may be below or above the actual ground surface at various locations. This can result in plume volumes that are inaccurate.

When a .apdv, .aidv, or .pgf is read by krig_3d_geology the files are interpreted as geology as follows:

1. If Top of boring elevations are provided in the file, these values are used to create the ground surface.

2. If Top of boring elevations are not provided in the file, the elevations of the highest sample in each boring are used to create the ground surface.

3. The bottom surface is created as a flat surface slightly below the lowest sample in the file. The elevation of the surface is computed by taking the lowest sample and subtracting 5% of the total z-extent of the samples.

Output

Because EVS runs under all versions of Microsoft Windows operating systems, there are numerous options for creating output.

Bitmap: EVS renders objects in the viewer in a user defined resolution. That resolution refers to the number of pixels in the horizontal and vertical directions.

Images: EVS also includes the output_images module, which will produce virtually all types of bitmap images supported by Windows. The most common types are .png; .bmp; .tga; .jpg; and .tif. PNG is the recommended format because it has high quality lossless compression.

Bitmap Animations: By using output_images with the Animator module, EVS can create bitmap animations. Once a sequence of images is created, the Images_to_Animation module is used to convert these to a bitmap animation format such as .AVI, .MPG, or a proprietary format called .HAV.

Printed Output: The viewer provides the ability to directly output to any Windows printer at a user defined resolution. Alternatively, images may be created (as in a) above) and printed.

Vector: EVS offers several vector output options. These include:

VRML: EVS creates VRML files which are a vector output format that allows for creation of 3D modules that model can be zoomed, panned and rotated and can represent most of the objects in the C Tech viewer. VRML files must be played in a VRML viewer or used for creating 3D PDFs or 3D printing.

4DIM: EVS creates 4DIMs, which unlike bitmap (image) based animations contain a complete 3D model at each frame of the animation. Each frame can be thought of as a VRML model (though it is not) and has similar functionality. Each frame of the model can be zoomed, panned and rotated as a static 3D model or you can interact with the 4DIM animation as it is playing.

2D and 3D Shapefiles: Shapefiles that are compatible with ESRI's ArcGIS program can be created in full three-dimensions. Nearly any object in your applications can be output as a shapefile. The primary limitations are associated with the limitations of shapefile. The most significant limitation is the lack of any volumetric elements.

AutoCAD .DXF Files: AutoCAD compatible DXF files can be created in full three-dimensions. Nearly any object in your applications can be output as a DXF file.

Archive: EVS offers several output options for archiving kriged results and/or geologic models. The preferred format is C Tech's fully documented EFF or EFB formats. Both of these file types can be read back into EVS eliminating the need to recreate the models by kriging or re-gridding. This saves time and provides a means to archive the data upon which analysis or visualization was based.

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