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Countrywide Data Sets

Imagery Product Overview

Orthomosaic imagery

Orthomosaic images are available at 6-inch (15 cm) and 12-inch (30 cm) ground sample distances. Standard perspective orthomosiac images include the visual effects of building lean (i.e., top and bottom appear displaced from vertical based upon the object’s height and distance from the image center). As such, coordinate values represent the ground and not the top of the object’s location as it appears in the imagery. This process relies upon a terrain elevation layer to remove the differential scaling and includes the removal of bridge and building distortions. Metadata and seamline data are provided as part of the delivery. Depending on the purchase method, imagery is delivered as a full 4-band (Red-Green-Blue-NearIR) or 3+3 (Red-Green-Blue and/or Green-Red- NearIR).

Accuracy Specifications

  • City Coverage 15.0 cm (6-inch)

    • RMSEx/y = 0.50 m (1.64 foot)

    • RMSEr = 0.71 m (2.33 foot)

    • CE90 = 1.07 m (3.51 foot)

    • CE95 = 1.22 m (4.00 foot)

  • Statewide Coverage of 15 and 30 cm (6-inch and 12-inch)

    • RMSEx/y = 1.2 m (3.93 foot)

    • RMSEr = 1.7 m (5.58 foot)

    • CE90 = 2.6 m (8.53 foot)

    • CE95 = 3.0 m (9.84 foot) 

Accuracy Statements

City Coverage 15.0 cm (6-inch)

Data is produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 50 (cm) RMSEx /RMSEy Horizontal Accuracy Class which equates to a RMSEr = 71 (cm) and Positional Horizontal Accuracy = +/- 122 (cm) at a 95% confidence level.

Statewide Coverage 15 and 30 cm (6-inch and 12-inch)

Data is produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 120 (cm) RMSEx /RMSEy Horizontal Accuracy Class which equates to RMSEr = 170 (cm) and Positional Horizontal Accuracy = +/- 300 (cm) at a 95% confidence level.

Coordinate Reference Systems

  • Webstore Download*

    • NAD 1983 2011 State Plane <State> <feet or meters>

    • WGS UTM Zone <#> (native and adjacent zones)**

    • NAD 1983 2011 UTM Zone <#> (native and adjacent zones)

  • Web Streaming

    • Dynamically projected on the fly based on the application’s request

    • A list is retrieved by applications using the “request=GetCapabilities” call to the streaming endpoint URL

  • Custom Order

    • NAD 1983 2011 UTM Zone <#> (native only)

    • Additional coordinate reference systems available upon request

*Two sets of 3-band delivered (RGB and CIR)
**Native UTM Zone is the UTM majority zone used for processing the data

Formats

  • GeoTIFF

  • JPG

  • PNG

Applications

HxGN Content Program imagery currently serves the autonomous vehicle, telecommunications, insurance, and electrical utility industries and numerous state government agencies.

  • Base mapping

  • Land use / Land cover analysis

  • Ecological modeling and analysis

  • Feature extraction (2D and 3D)

  • Landscape and urban planning

 

Delivery

  • Webstore Download

  • Web Streaming

    • WMS

    • WMTS

    • ArcGIS REST/SOAP

  • Custom Order

Elevation Product Overview

Digital Surface Model (DSM)

Stereo photogrammetry derived* elevation values represent the highest elevation within each pixel above a reference datum. Features represented are open terrain surface heights, roads, embankments, buildings, forest canopy tops, and cultivated field tops. Retained point features** can be tailored to general or specific user application categories (e.g., forestry, buildings, line-of-sight). Each point in the respective data set is encoded with false color infrared (FCIR) and normal color (RGB) spectral data derived from the imagery to produce two distinct data sets per geographic region. Data sets are delivered as original vector point clouds or interpolated raster grids at various point densities and resolutions. Point cloud data is formatted as ASPRS LAS v1.2 and delivered in a zipped LAS file format (*.laz). Resolution is based on the nominal acquisition GSD of the specific geographic region.

*A semi-global matching (SGM) photogrammetric process is employed that leverages overlapping high spatial resolution imagery to extract points at a resolution that approaches the native resolution of the imagery.
**Off-the-shelf files represent unfiltered (e.g., may contain noise) representations of the surface produced to aid in the orthorectification process and may need to be refined further to be fit for purpose based on the user’s specific use case.

Accuracy Specifications

All accuracy specifications are based on flat, open terrain and full-resolution DSM

  • RMSEz = 2x GSD

  • RMSEx/y = 2x GSD

 

Coordinate Reference Systems

  • North America

    • Horizontal – UTM NAD83 (2011) epoch 2010 meters

    • Vertical – NAVD88 (Geoid12b) meters

  • Europe

    • Horizontal – UTM IRTF2008 epoch 2005 (wgs84-g1674)

    • Vertical – EGM08 meters

Formats

  • Point cloud – ASPRS LAS/LAZ v1.2***

  • Raster – GeoTIFF

***All files are delivered in a zipped LAS file format (*.laz) that may need to be unpacked before being used in some software.

Applications

Photogrammetrically derived elevation data sets typically offer better correspondence with accompanying image data, improved point densities, better canopy modeling, increased building material identification, classification accuracy, and thus feature extraction compared to LiDAR data. Photogrammetrically derived point clouds are suitable for many modeling applications in urban and rural environments. Off-the-shelf DSM data may not be suitable or fit for all applications. A custom derivative data generation process can potentially provide data that is more suited for specific requirements and specifications.

Past customer usage includes but is not limited to:

  • Forest structure modeling (heights, habitat mapping, fire fuel loading, growth rates, productivity, site index)

  • Change detection

  • Telecommunications engineering and planning

  • Vegetation encroachment analysis

  • Radio line-of-sight analysis

  • Solar potential modeling

  • Airport obstruction modeling

 

Digital Elevation Model (DEM)

The digital elevation model (DEM) is a hybrid-derived data set which includes direct and interpolated bare earth surface heights. Surface extraction methodology involves grid interpolation, and a smoothing kernel applied to the thinned key points with some automated ground classification. Buildings, isolated trees and objects of similar size/extent are removed through an automated process. Directly measured elevations include open terrain surface heights, road surface heights, and otherwise unoccupied/non-vegetated terrain surfaces. Interpolated data appear in areas of the forest canopy, crops, buildings, isolated trees, and other objects of similar size/extent removed through the automated process. The resolution is 5.0 meters.

Accuracy Specifications

  • RMSEz = 1.6 m (5.25 foot)

  • RMSEx/y = 0.50 m (1.64 foot)

  • RMSEr = 0.71 m (2.33 foot)

  • CE90 = 1.07 m (3.51 foot)

  • CE95 = 1.22 cm (4.00 foot)

 

Coordinate Reference Systems

  • North America

    • Horizontal – UTM NAD83 (2011) epoch 2010 meters

    • Vertical – NAVD88 (Geoid12b) meters

  • Europe

    • Horizontal – UTM IRTF2008 epoch 2005 (wgs84-g1674)

    • Vertical – EGM08 meters

Format

  • GeoTiFF

 

Applications

Past customer usage includes but is not limited to:

  • Base mapping

  • Landscape planning

  • Image orthorectification

  • Terrain modeling and extraction

  • Surface height normalization

  • Flooding analysis

  • Change detection

  • Flight planning

 

Stereo Imagery

Stereo models are in a sensor-specific format, ADS pushbroom, or frame based on date of acquisition. For the ADS, imagery viewing angles are system-dependent (i.e., 100 or 120). The ADS 100 uses 19 degrees back and 26 degrees forward, while the ADS 120 uses 10 degrees back and 14 degrees forward. ADS imagery as a stereo product is unique and requires a more focused workflow. The delivery includes aerial images, exterior orientation parameters, and a sensor model description. The nominal resolution for wide area coverage in urban areas is 40 cm and 20 cm.

It is important to note that the following photogrammetry software handles ADS pushbroom imagery:

  • BAE Socet Set or Socet GXP

  • DATEM Summit Evolution

  • Intergraph Imagestation

  • Leica/Erdas Imagine LPS

  • Leica/Erdas Stereo Analyst for ArcGIS

  • KLT-Atlas

 

Accuracy Specifications

  • RMSEz = 1x GSD

  • RMSEx/y = 1x GSD

Product accuracy estimates are based on a combination of aerial triangulation results, comparison to ground control, and subsequent three-dimensional (3D) shear analysis that ensures relative alignment between flight lines in a standard photogrammetric block. Final accuracy estimates are evaluated against ground object positions in flat and open terrain.

Coordinate Reference Systems

  • North America

    • Horizontal – UTM NAD83 (2011) epoch 2010 meters

    • Vertical – NAVD88 (Geoid12b) meters

  • Europe

    • Horizontal – UTM IRTF2008 epoch 2005 (wgs84-g1674)

    • Vertical – EGM08 meters

Format

  • Resolution: 1x GSD

  • Imagery for each ADS-L1 image is contained in multiple files:

    • *.ads - a pointer file that lists each of the *.tif image segments for the strip

    • *.hist - histogram for strip in XML format

    • *.odf - orientation data file containing the x,y,z, omega, phi, and kappa orientations for each scanline

    • *.odf.adj - orientation data after AT adjustment

    • *.min - list of minification files (minifications are normally not included on distribution media)

    • *.sup - BAE SocetSet support file, georeferenced data for SocetSet and other softcopy stereo applications.

    • *.tif – plain TIFF file (no georeferencing). Multiple TIFF files containing ADS imagery rectified to the AMT elevation

Applications

Elevation mapping and modeling for the top surface of objects and ground cover as per the traditional usage of DSM data sets derived from imagery

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