Note: Geoscience Australia no longer supports users' external hard drives. The data can either be downloaded from the ELVIS Portal or from the Related links. The 1 second Shuttle Radar Topography Mission (SRTM) Digital Elevation Models Version 1.0 package comprises three surface models: the Digital Elevation Model (DEM), the Smoothed Digital Elevation Model (DEM-S) and the Hydrologically Enforced Digital Elevation Model (DEM-H). The DEMs were derived from the SRTM data acquired by NASA in February 2000 and were publicly released under Creative Commons licensing from November 2011 in ESRI Grid format.

DEM represents ground surface topography, with vegetation features removed using an automatic process supported by several vegetation maps. This provides substantial improvements in the quality and consistency of the data relative to the original SRTM data, but is not free from artefacts. Man-made structures such as urban areas and power line towers have not been treated. The removal of vegetation effects has produced satisfactory results over most of the continent and areas with defects identified in supplementary layers distributed with the data, and described in the User Guide.

DEM-S represents ground surface topography, excluding vegetation features, and has been smoothed to reduce noise and improve the representation of surface shape. An adaptive smoothing process applied more smoothing in flatter areas than hilly areas, and more smoothing in noisier areas than in less noisy areas. This DEM-S supports calculation of local terrain shape attributes such as slope, aspect and curvature that could not be reliably derived from the unsmoothed 1 second DEM because of noise.

DEM-H is a hydrologically enforced version of the smoothed DEM-S. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. The dataset was derived from the 1 second smoothed Digital Elevation Model (DEM-S) by enforcing hydrological connectivity with the ANUDEM software, using selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse lines and lines derived from DEM-S to define the watercourses. The drainage enforcement has produced a consistent representation of hydrological connectivity with some elevation artefacts resulting from the drainage enforcement.

Further information can be found in the supplementary layers supplied with the data and in the User Guide.

This is a tiled collection of the 3D Elevation Program (3DEP) and is one meter resolution. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use 3DEP data for hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. The elevations in this DEM represent the topographic bare-earth surface. USGS standard one-meter DEMs are produced exclusively from high resolution light detection and ranging (lidar) source data of one-meter or higher resolution. One-meter DEM surfaces are seamless within collection projects, but, not necessarily seamless across projects. The spatial reference used for tiles of the one-meter DEM within the conterminous United States (CONUS) is Universal Transverse Mercator (UTM) in units of meters, and in conformance with the North American Datum of 1983 ...

The 1 second SRTM derived DEM-H Version 1.0 is a 1 arc second (~30 m) gridded digital elevation model (DEM) that has been hydrologically conditioned and drainage enforced. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. The dataset was derived from the 1 second smoothed Digital Elevation Model (DEM-S; ANZCW0703014016) by enforcing hydrological connectivity with the ANUDEM software, using selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse lines (ANZCW0503900101) and lines derived from DEM-S to define the watercourses. The drainage enforcement has produced a consistent representation of hydrological connectivity with some elevation artefacts resulting from the drainage enforcement. A full description of the methods is in preparation (Dowling et al., in prep).

This product is the last of the Version 1.0 series derived from the 1 second SRTM (DSM, DEM, DEM-S and DEM-H) and provides a DEM suitable for use in hydrological analysis such as catchment definition and flow routing.

This dataset is raster digital elevation model (DEM) data covering the City of Philadelphia, PA. The data were collected for the City of Philadelphia in April 2022. DEMs were generated from the raw data. This lidar point cloud data covers approximately 239 square miles total. At the time of capture ground conditions were leaf-off, snow free, and water was at normal levels.

The lidar mapping re...

Imagery acquired with unmanned aerial systems (UAS) and coupled with structure from motion (SfM) photogrammetry can produce high-resolution topographic and visual reflectance datasets that rival or exceed lidar and orthoimagery. These new techniques are particularly useful for data collection of coastal systems, which requires high temporal and spatial resolution datasets. The U.S. Geological Survey worked in collaboration with members of the Marine Biological Laboratory and Woods Hole Analytics at Black Beach, in Falmouth, Massachusetts to explore scientific research demands on UAS technology for topographic and habitat mapping applications. This project explored the application of consumer-grade UAS platforms as a cost-effective alternative to lidar and aerial/satellite imagery to support coastal studies requiring high-resolution elevation or remote sensing data. A small UAS was used to capture low-altitude photographs and GPS devices were used to survey reference points. These data were processed in an SfM workflow to create an elevation point cloud, an orthomosaic image, and a digital elevation model.

Peel's Digital Elevation Model (DEM) provides a generalized representation of both surface and ground features at a 1 metre resolution. The data is created using breaklines and a 10-metre grid of masspoints, both of which are photogrammatically created.

Available products

Peel Digital Elevation Model in TIFF format - 1.5 Gigabytes

Specifications

Capture year: Spring 2022 Spatial resolution: 1-metre File format: GeoTIFF, losslessly compressed Pixel type and depth: 32-bit float Horizontal projection: NAD 1983 UTM Zone 17N (EPSG: 26917) Vertical projection: CGVD 1928 (EPSG: 5713) Horizontal accuracy: ±50 centimetres Vertical accuracy: ±50 centimetres Method of creation: photogrammetric

Other data (Lidar) The Region of Peel doesn't have Lidar data in-house. The Province of Ontario through Land Information Ontario provides the following Lidar and Lidar-based datasets through their open data program:

Lidar-derived Digital Terrain Model (DTM) Lidar-derived Digital Surface Model (DSM) Lidar-derived classified point cloud - by request

A digital elevation model (DEM) at a resolution of 2 m that shows the topography of the land. This DEM is what is called a bare earth model; in that the elevation model is representative of the land without taking into account the trees and buildings. The original LiDAR data that the DEM was derived from was captured by PHB Lasermap for HRM in April 2007 and was processed by Applied Geomatics Research Group at NSCC in 2012. Metadata

The New Zealand 1m DEM Survey Index dataset provides an index to all LiDAR datasets that make up the national New Zealand LiDAR 1m DEM, an amalgamation of the most current LiDAR surveys. It is current as at the most recent published date found in the History tab.

The DEM is available as layer: New Zealand LiDAR 1m DEM

Each record in the dataset provides both a geometry of the extent of the elevation survey, name of the survey, capture dates, as well as other useful metadata attributes linking this layer with the data on the NZ Elevation public S3 bucket. The extents are derived from the maximum extent of each DEM dataset coverage.

Data management and distribution is by Toitū Te Whenua Land Information New Zealand. Management of this layer is ongoing and it will be updated with newer data as it becomes available.

The New Zealand 1m DEM data is also available on: • Basemaps as a Terrain-RGB service.

• NZ Elevation - Registry of Open Data on AWS, specifically at s3://nz-elevation/new-zealand/new-zealand/dem_1m/2193/. This is the data source and at this location it is LERC compressed and made available as Cloud Optimised GeoTIFFs.

Additional metadata from the S3 source: • STAC Collection

• Capture Dates

• Capture Area

Please note that this dataset is manually imported into the LINZ Data Service after the S3 source is updated and while LINZ will endeavour to keep it up-to-date, it may not reflect the most recently published data in S3. Check the History tab to determine the most recent LINZ Data Service publish date. S3 source update dates are provided in the STAC Collection metadata file.

For details see: https://www.linz.govt.nz/data/licensing-and-using-data/attributing-elevation-or-aerial-imagery-data"

The Digital Elevation Model (DEM) 5 Metre Grid of Australia derived from LiDAR model represents a National 5 metre (bare earth) DEM which has been derived from some 236 individual LiDAR surveys between 2001 and 2015 covering an area in excess of 245,000 square kilometres. These surveys cover Australia's populated coastal zone; floodplain surveys within the Murray Darling Basin, and individual surveys of major and minor population centres. All available 1 metre resolution LiDAR-derived DEMs have been compiled and resampled to 5 metre resolution datasets for each survey area, and then merged into a single dataset for each State. These State datasets have also been merged into a 1 second resolution national dataset.

The acquisition of the individual LiDAR surveys and derivation of the 5m product has been part of a long-term collaboration between Geoscience Australia, the Cooperative Research Centre for Spatial Information (CRCSI), the Departments of Climate Change and Environment, State and Territory jurisdictions, Local Government and the Murray Darling Basin Authority under the auspices of the National Elevation Data Framework and Coastal and Urban DEM Program, with additional data supplied by the Australian Department of Defence. The source datasets have been captured to standards that are generally consistent with the Australian ICSM LiDAR Acquisition Specifications with require a fundamental vertical accuracy of at least 0.30m (95% confidence) and horizontal accuracy of at least 0.80m (95% confidence).

This is a tiled collection of the 3D Elevation Program (3DEP) and is 1 arc-second (approximately 30 m) resolution. The elevations in this Digital Elevation Model (DEM) represent the topographic bare-earth surface. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use 3DEP data for hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. The seamless 1 arc-second DEM layers are derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. These data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). All elevation values are in meters and, over the continental United States, are referenced to the North American Vertical Datum of 1988 ( ...

The following text was abstracted from Bruce Gittings' Digital Elevation Data Catalogue: 'http://www.geo.ed.ac.uk/home/ded.html'. The catalogue is a comprehensive source of information on digital elevation data and should be retrieved in its entirety for additional information.

The European 1:1M database now includes the European Union (EU) plus Scandanavia & Eastern Europe. Cost is #355 per small country to #492 for large countries. Prices for the whole of Europe are also available.

Ireland is now part of the Europe 1:1M database, although actually captured at 1:500K and previously named Ireland 1:500K database.

Discounts are normally available for educational establishments. For research and teaching (excluding commercial research) the data can be obtained at very low prices through CHEST at Manchester University Computing Centre (Tel: 061 275 6099). Higher education users in ALL European countries excluding the former Warsaw Pact area (for the time being) may obtain data through CHEST following a new deal.

The Hydrologically Enforced Digital Elevation Model (DEM-H) was derived from the SRTM data acquired by NASA in February 2000. The model has been hydrologically conditioned and drainage enforced. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. The dataset was derived from the 1 second smoothed Digital Elevation Model (DEM-S; ANZCW0703014016) by enforcing hydrological connectivity with the ANUDEM software, using selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse lines (ANZCW0503900101) and lines derived from DEM-S to define the watercourses. The drainage enforcement has produced a consistent representation of hydrological connectivity with some elevation artifacts resulting from the drainage enforcement. A full description of the methods is in preparation (Dowling et al., in prep). This product provides a DEM suitable for use in hydrological analysis such as catchment definition and flow routing. There are several areas with unexpected negative values: close to Canberra around (150.443044, -35.355281) with values of -55 and in Western Australia around (124.84, -16.44) with -43.

This layer contains the New Zealand national 1m DEM which is an amalgamation of the most current LiDAR surveys. It is current as at the most recent Published date found in the History tab.

For information on datasets that make up the New Zealand 1m DEM, please visit this layer: New Zealand 1m DEM Survey Index

The most recent DEM data can also be accessed from the NZ Elevation public S3 bucket via the link below, which is automatically updated when new elevation layers are added.

Data management and distribution is by Toitū Te Whenua Land Information New Zealand. Management of this layer is ongoing and it will be updated with newer data as it becomes available.

Data comprises: • 400+ GeoTIFF tiles in NZTM2000 projection, merged from a variety of source surveys and tiled into the LINZ 1:50,000 tile layout.

Vertical Accuracy Specification is +/- 0.2m (95%). Horizontal Accuracy Specification is +/- 1.0m (95%). Vertical datum is NZVD2016.

Also available on: • Basemaps as a Terrain-RGB service.

• NZ Elevation - Registry of Open Data on AWS, specifically at s3://nz-elevation/new-zealand/new-zealand/dem_1m/2193/. This is the data source and at this location it is LERC compressed and made available as Cloud Optimised GeoTIFFs.

Additional metadata from the S3 source: • STAC Collection

• Capture Dates

• Capture Area

Please note that this dataset is manually imported into the LINZ Data Service after the S3 source is updated. It may not reflect the most recently published data in S3. Check the History tab to determine the most recent LINZ Data Service publish date. S3 source update dates are provided in the STAC Collection metadata file.

Use with the following attribution: "Sourced from the LINZ Data Service and licensed by Toitū Te Whenua Land Information New Zealand, for re-use under CC BY 4.0".

For details see: https://www.linz.govt.nz/data/licensing-and-using-data/attributing-elevation-or-aerial-imagery-data"

This dataset consists of:

1 GeoEye-1 stereo imagery of an area of approximately 100 square kilometres including McDonald Island, captured 19 May 2012

2 A Digital Elevation Model (DEM) derived from the GeoEye-1 stereo imagery; and

3 Image products derived from the most vertical dataset of the stereo imagery and orthorectified using the DEM.

4 Contours generated from the DEM.

The DEM was produced at a 1 metre pixel size and is available in ESRI grid, ESRI ascii and BIL formats.

The DEM and image products are stored in a Universal Transverse Mercator zone 43 south projection, based on the WGS84 datum.

The image products are geotiffs as follows.

McDonald_Island_BGRN.tif: GeoEye-1 4-band multispectral (vis blue, green, red and Near Infrared), 2 metre resolution.

McDonald_Island_PAN.tif: GeoEye-1 panchromatic, 0.5 metre resolution.

McDonald_Island_PS_BGRN.tif: GeoEye-1 pansharpened, 4-band multispectral (vis blue, green, red and Near Infrared), 0.5 metre resolution.

McDonald_Island_RGB.tif: GeoEye-1 pansharpened, natural colour enhancement, 0.5 metre resolution.

description: Digital Elevation Model (DEM) is a representation of the topography of the Earth surface in digital format. The data is made up of sampled arrays of pixels depicting surface elevations in raster form. This data was captured as an ancillary product of a statewide ortho image acquisition using a Lecia ADS40 sensor. The primary DEM is a 5-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83). The geographic extent of the DEM is equivalent to a quarter-quadrangle plus the over edge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The over edge is included to facilitate for the placement of the NAD83 and secondary datum corner ticks. This series of DEM's was produced as a part of the 2006 Arkansas Digital Orthophotography Program administered by the Arkansas State Land Information Board and the Arkansas Geographic Information Office. The aerial imaging data used to create the DEM was acquired between January 15th and March 31st in 2006.; abstract: Digital Elevation Model (DEM) is a representation of the topography of the Earth surface in digital format. The data is made up of sampled arrays of pixels depicting surface elevations in raster form. This data was captured as an ancillary product of a statewide ortho image acquisition using a Lecia ADS40 sensor. The primary DEM is a 5-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83). The geographic extent of the DEM is equivalent to a quarter-quadrangle plus the over edge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The over edge is included to facilitate for the placement of the NAD83 and secondary datum corner ticks. This series of DEM's was produced as a part of the 2006 Arkansas Digital Orthophotography Program administered by the Arkansas State Land Information Board and the Arkansas Geographic Information Office. The aerial imaging data used to create the DEM was acquired between January 15th and March 31st in 2006.

A seamless hydro-flattened digital elevation model (DEM) with 2 metre resolution. The DEM is what is called a bare earth model; in that the elevation model is representative of the land without taking into account the trees and buildings.The LiDAR data was captured for the Halifax Regional Municipality's coastal flood mapping project through topographic andtopo-bathymetric lidar data collection in 2017-2018 and was processed by the Applied Geomatics Research Group at NSCC. Metadata

The 3 second (~90m) Shuttle Radar Topography Mission (SRTM) Derived Digital Elevation Models Version 1.0 package comprises three elevation models: the Digital Surface Model (DSM; ANZCW0703014216), the Digital Elevation Model (DEM; ANZCW0703014182) and the Smoothed Digital Elevation Model (DEM-S; ANZCW0703014217). The DEMs were derived from re-sampling the 1 second SRTM models derived from the SRTM data captured by NASA in February 2000, supported by the GEODATA 9 second DEM in void areas and other supplementary layers. DSM represents the ground surface topography as well as features above the ground, such as vegetation and man-made structures. Stripes and voids have been removed from the 1 second SRTM data to provide an enhanced and complete DSM for Australia and near-shore islands. DEM represents ground surface topography, with vegetation features removed using an automatic process supported by several vegetation maps. This provides substantial improvements in the quality and consistency of the data relative to the original SRTM data, but is not free from artefacts. Man-made structures such as urban areas and power line towers have not been treated. The removal of vegetation effects has produced satisfactory results over most of the continent and areas with defects identified in supplementary layers distributed with the data, and described in the User Guide. DEM-S represents ground surface topography, excluding vegetation features, and has been smoothed to reduce noise and improve the representation of surface shape. An adaptive smoothing process applied more smoothing in flatter areas than hilly areas, and more smoothing in noisier areas than in less noisy areas. This DEM-S supports calculation of local terrain shape attributes such as slope, aspect and curvature that could not be reliably derived from the unsmoothed 1 second DEM because of noise. The 3 second DEMs do not include the hydrologically enforced product, which is only available in 1 second resolution. The 3 second DEMs were released under Creative Commons attribution licensing in ESRI Grid format. Further information can be found in the supplementary layers supplied with the data and in the User Guide.

The EU-DEM is a Digital Surface Model (DSM) representing the first surface as illuminated by the sensors. EU-DEM covers the EEA39 countries and it has been produced by a consortium led by Indra, Intermap edited the EUDEM and AGI provided the water mask. The EU-DEM is a 3D raster dataset with elevations captured at 1 arc second postings (2.78E-4 degrees) or about every 30 meter. It is a hybrid product based on SRTM and ASTER GDEM data fused by a weighted averaging approach. The EU-DEM is generated as a contiguous dataset devided into 1 degree by 1 degree tiles corresponding to the SRTM naming convention. Ownership of EU-DEM belongs to European Commision, DG Enterprise and Industry.

This layer contains the DEM for LiDAR data in the Southland Region, captured between 15 December 2020 to 30 January 2024.

• The DSM is available as layer Southland - LiDAR 1m DSM (2020-2024).

• The index tiles are available as layer Southland - LiDAR Index Tiles (2020-2024).

• The LAS point cloud and vendor project reports are available from OpenTopography.

LiDAR was captured for Environment Southland by Aerial Surveys Ltd between 15 December 2020 to 30 January 2024. These datasets were generated by Aerial Surveys and their subcontractors. Data management and distribution is by Toitū Te Whenua Land Information New Zealand.

Data comprises:

• DEM: tif or asc tiles in NZTM2000 projection, tiled into a 1:1,000 tile layout

• DSM: tif or asc tiles in NZTM2000 projection, tiled into a 1:1,000 tile layout

• Point cloud: las tiles in NZTM2000 projection, tiled into a 1:1,000 tile layout

Pulse density specification is at a minimum of 4 pulses/square metre.

Vertical Accuracy Specification is +/- 0.2m (95%) Horizontal Accuracy Specification is +/- 1.0m (95%)

Vertical datum is NZVD2016.