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Data Products and Interpolation

Oak Ridges Moraine Groundwater Program

Clip 'n Ship

ORMGP partners and paid subscribers can download the spatial layers we produce and some data. To do this, users specify a small, rectangular area, inside which a 3D block of the geologic data is provided. The specified area must not exceed 18 square kilometre (the user will get a warning if the specified rectangular area exceedss this). Note: If users require a larger area, please contact ORMGP.

The first step in this process is the clip function. This is where the user supplies the areal extent of their data request. The return is the spatial layers and data available within the specified extent.
ArcMAP Clip function

The ship feature then provides a compressed file with all available data for download.

Data Formats

The data format for export is compressible and efficient. The files formats are less common, yet are general enough that they are compatible with common GIS platforms. Data are compressed into a tar.gz file, which can be opened using free and open software such as 7-Zip and WinRAR.

File Formats

Raster Files

Raster files are provided in a band interleaved by line (*.bil) format. This is a raw binary format and is accompanied by two other files: (1) a header file (*.hdr) and (2) a projection file (*.prj). This format will open in ArcGIS, QGIS, Surfer and will load as a NumPy array.

Vector Files

Vector files (in particular polylines and polygons) are provided in GeoJson (*.geojson) format. This is an ascii-format file that is flexible, but can be slow. It is suggested that files be converted to shapefiles (*.shp) when performance is desired.

Point Data

Point data and database queries are provided in comma-separated value (*.csv) format. This tabular format stores data as plain text, where each line in the file represents one data record, or location. Each record contains the same number of fields, and each field is separated by a comma. CSV files can be opened with any text editor or with Microsoft Excel, or can be imported into a database (e.g., Microsoft Access).


our metadata repository

How to Cite

When referring to the interpretations and data from the Clip ‘n Ship function, please cite in the following format: “Oak Ridges Moraine Groundwater Program Website ( 2023. Accessed mm/dd/yyyy”

Data Description

Geology Folder


The Clip ‘n Ship function provides the top elevation and thickness (isopach) for each interpreted hydrostratigraphic unit within the ORMGP jurisdiction. The following figure shows the intepreted units: image

Interpreted layer elevations and thicknesses are provided as raster files (.bil format, see above) and follow this pattern: *WB_2021_LayerNo_LayerName_LayerType_dateCreated-crop.bil.

The complete list of raster files is below along with a brief description (as mentioned above, each *.bil file listed below includes two additional files that are not listed here). All elevations are in metres above sea level (m asl) and isopach maps are in metres:

Database Queries (*.csv)

The following five csv files provide results from database queries for the user-selected polygon.


In the Hydrogeology folder of the compressed file, several raster files are included for the interpreted water table and potentiometric surface mapping: (more information about how these surfaces were generated can be found here)) (metadata here)

The naming convention is as follows:

The included rasters are: