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Data Products and Interpolation

Oak Ridges Moraine Groundwater Program

Clip 'n Ship

ORMGP partners can gain access to the spatial layers we produce. 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).

The first part is the clipping function. This is where the user supplies the areal extent of their data request, and the return is all the data available within those extents.
ArcMAP Clip function

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

Data Formats

The data format chosen for the exports is compressible and efficient. The files formats are thus less common, yet are general enough that they’ll open on 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


Rasters are provided in a band interleaved by line (*.bil) format. This is a raw binary format and is accompanied by header file (*.hdr) and a projection file (*.prj). Files will open in ArcGIS, QGIS, Surfer and will load as a NumPy array.


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


Point data, database queries, are provided in comma-separated value (*.csv) format.


our metadata repository

How to Cite

“Oak Ridges Moraine Groundwater Program Website ( 2023. Accessed mm/dd/yyyy”

Data Description



Geologic Model layers follow a pattern: WB_2021_LayerNo_LayerName_LayerType_dateCreated-crop.bil.

For example

Each geologic layer includes a set of bil, hdr, and prj files for both the layer top and the isopach.

Database Queries (*.csv)

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