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Provincial Digital Elevation Model - Version 3.0
Abacus Data Network
Ontario Ministry of Natural Resources and Forestry — 2013-10-09 Purpose: The Provincial DEM can be used for a number of applications such as landscape classification and general terrain analysis. For more detailed information please see the Provincial DEM Technical Specifications' document attached to this metadata record. The data is distributed as two seperate packages, north and south. Each package contains a number of tiled DEM raster datasets in a sinlge ESRI file geodatabase. Please see the "Provincial DEM Index Map" image attached to this metadata record. Or, download the "ProvincialDEM_Index" shapefile attached to this metadata record. The Provincial DEM is designed to represent true ground elevation across the Province. Based on best source data for different parts of the Province, it is a general purpose dataset from which other special purpose datasets have been derived. The Provincial DEM is based on three source datasets: the Ontario Radar DSM, OBM, DTM points and contours, and 2002 GTA Ortho contours. This dataset has not been conditioned for any specific application. As a result, for hydrologic applications, it is suggested that the Ontario Integrated Hydrology dataset is used. This is a separate data product that is available through Land Information Ontario (LIO). The Ontario Integrated Hydrology data is specifically designed for hydrologic analysis, such as watershed creation and flow tracing.
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Bathymetry Point
Abacus Data Network
Ontario Ministry of Natural Resources and Forestry — 2013-01-03 <p>Over the course of 50 years the Ontario Ministry of Natural Resources and Forestry (OMNRF) has captured bathymetry data for over 10,000 lakes across Ontario.</p> <p>In 1968 the Department of Lands and Forests initiated the Aquatic Habitat Inventory Program to collect information for Ontario’s inland water data. One product was a series of contour maps showing lake depth. In many cases, these maps still represent the only authoritative source of bathymetry data for lakes in Ontario. These maps have been converted to digital GIS data which has resulted in the vast majority of the current data in the Bathymetry Line data class.</p> <p>More recent bathymetric data has been collected using sonar and GPS technology. This modern technique creates lake depth points (spot depths) rather than contours. This point data is stored in the Bathymetry Point data class.</p> <p>Bathymetry Points indicate the measurement of water depth at various places in a body of water, and are often called spot depths.</p> <p>The data in this layer has primarily been collected using a depth measurement device, such as an echo-sounder, in combination with a GPS for horizontal positioning. However, other survey methods such as bathymetric LiDAR may also have been used. Please see the Bathymetry Index layer for the survey method used in each water body.</p> <p>The points in this layer are the source data for all bathymetric data and should be used (when available) for the creation of bathymetric derivative products such as rasters, TINs and depth contours. Point densities will vary by water body and within water bodies, depending on the parameters or the survey.</p> <p>Bathymetry point and line data should not be used for navigational purposes.</p>
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Lot Fabric Improved
Abacus Data Network
Ontario Ministry of Natural Resources and Forestry — 2016-05-12 <p>Land identifying a portion of a Concession within a Geographic Township. The townships, concessions and lots comprise the original township fabric of the Province.</p> <p>The spatial accuracy of the lot fabric for some townships has been improved through the Ontario Parcel, Township Realignment and Township Improvement projects. Improvements to the fabric may include: road allowance widths, spatial changes to better represent the location of lot boundaries, and more consistent concession names.</p> <p>Legislated or Legal Authority for Collection: None</p> <p>Additional Time Period Information: Data is collected on an on-going basis therefore the time period 'end date' may be more recent than indicated above.</p> <p>Purpose: The geographic township fabric (which includes lots) is a fundamental land subdivision of the Province, which is shown as it was originally surveyed, unless it has been annulled upon the instruction of the Surveyor General. </p>
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Bathymetry Index
Abacus Data Network
Ontario Ministry of Natural Resources and Forestry — 2013-01-02 <p>Over the course of 50 years the Ontario Ministry of Natural Resources and Forestry (OMNRF) has captured bathymetry data for over 10,000 lakes across Ontario.</p> <p>In 1968 the Department of Lands and Forests initiated the Aquatic Habitat Inventory Program to collect information for Ontario’s inland water data. One product was a series of contour maps showing lake depth. In many cases, these maps still represent the only authoritative source of bathymetry data for lakes in Ontario. These maps have been converted to digital GIS data which has resulted in the vast majority of the current data in the Bathymetry Line data class.</p> <p>More recent bathymetric data has been collected using sonar and GPS technology. This modern technique creates lake depth points (spot depths) rather than contours. This point data is stored in the Bathymetry Point data class.</p> <p>The Bathymetry Index contains polygons representing the boundaries of all lakes that have bathymetry populated in the Bathymetry Line data class. Limited metadata information unique to each lake such as the survey year, survey method and scale of original map is included with the polygons. The polygons have been copied from OHN but do not necessarily represent the actual extent of bathymetric mapping within a given lake (bathymetric mapping could be larger or smaller than polygon extents).</p> <p>Bathymetry point and line data should not be used for navigational purposes.</p>
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Bathymetry Line
Abacus Data Network
Ontario Ministry of Natural Resources and Forestry — 2013-01-02 <p>Over the course of 50 years the Ontario Ministry of Natural Resources and Forestry (OMNRF) has captured bathymetry data for over 10,000 lakes across Ontario.</p> <p>In 1968 the Department of Lands and Forests initiated the Aquatic Habitat Inventory Program to collect information for Ontario’s inland water data. One product was a series of contour maps showing lake depth. In many cases, these maps still represent the only authoritative source of bathymetry data for lakes in Ontario. These maps have been converted to digital GIS data which has resulted in the vast majority of the current data in the Bathymetry Line data class.</p> <p>More recent bathymetric data has been collected using sonar and GPS technology. This modern technique creates lake depth points (spot depths) rather than contours. This point data is stored in the Bathymetry Point data class.</p> <p>Bathymetry Line contains lines of constant depth called depth contours or isobars. Depth contours are used to describe the terrain relief below the surface of the water.</p> <p>The data used to derive the depth contours are always spot depths but the density and positional accuracy of these spot depths vary depending on the survey style and parameters. Before GPS data was available, spot depth locations were derived by straight line transects across a water body which were then plotted on a map. The time consuming nature of this method limited the number of transects collected. Now GPS data collection is not limited to transects and therefore spot depth collections tend to be far denser with greater horizontal accuracy.</p> <p>Depth contours have been derived in one of two ways:</p> <ol> <li><p>Visually interpreted and drawn by hand based on transects of the water body</p></li> <li><p>Interpolated using GIS processes such as Kriging or Natural Neighbours</p></li> </ol> <p>Vertical accuracy of the data varies greatly depending on the density of spot depth collected for each lake. Horizontal accuracy will also vary greatly on older transect based collections but will be within 5m for GPS based collections.</p> <p>Bathymetry point and line data should not be used for navigational purposes.</p>

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(Source Repository: Abacus Open Data) AND (Author: Ontario Ministry of Natural Resources and Forestry)

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