Auto-Correlated DEM Extents and Indices

INDICES.AutoCorrelated_DEM_Extents is a polygon dataset of the areas where auto-correlated DEM elevation is available in the State of Utah.

INDICES.AutoCorrelated_DEM_Extents is intended to be used to determine what auto-correlated DEM elevation datasets are available for areas across the State of Utah.

The auto-correlation process is not as rigorous as other methods of elevation modeling such as photogrammetry, LiDAR mapping, radar mapping, etc, and therefore end-users should be aware that anomalies are expected within the elevation dataset.

These boundaries are maintained by AGRC with the help of many state, county, and local entities. Changes and updates are made as new auto-correlated DEM elevation data is a acquired in Utah.

The native spatial reference for this dataset is UTM Zone 12N, NAD83 (0.01 meter coordinate precision).

Each polygon extent contains the following attribute fields when available or applicable:

• Resolution - the resolution or pixel size of the data
• Year_Collected - the year collected
• Description - a short description
• File_Format - the file format
• File_Extension - the file extension
• Average_File_Size - the average file size of an individual image tile
• Total_Size - the total file size of the entire product collection
• Horizontal_Accuracy - the horizontal positional accuracy
• Vertical_Accuracy - the vertical positional accuracy
• Total_Square_Miles - the total square miles of the dataset
• Contact - contact information
• In_House - whether or not it is distributed from AGRC's FTP site
• FTP_Path - the FTP directory to download the data from
• Product - a generalize product name
• Category - a generalized product category name
• Estimated_Date - an estimated date the data was collected
• HTML_Page - the URL to a webpage for the product
• REST_Endpoint - the REST end point URL
• LYR_File - a layer pointer and symbology
• FlightDate_Location - where to find the exact flight date for each individual tile of data
• Tile_Index - the tile index in the SGID for each product
• Upload_Date - the date the polygon extent was loaded into the dataset

There are no constraints or warranties with regard to the use of this dataset. Users are encouraged to attribute content to: State of Utah, SGID.

This dataset is maintained by AGRC in partnership with state and local government.

Related Resources

• Auto-Correlated DEM Extents and Indices Package
• Download Elevation and Terrain Data

Comments, questions, compliments, or concerns can be directed to Rick Kelson from AGRC at RKelson@utah.gov.

The auto-correlated DEM tile indices can be used to determine the boundaries of the 2 meter (from HRO2006 imagery) and 5 meter (from NAIP2006 imagery) auto-correlated DEMs from 2006.

The auto-correlation process is not as rigorous as other methods of elevation modeling such as photogrammetry, LiDAR mapping, radar mapping, etc, and therefore end-users should be aware that anomalies are expected within the elevation dataset.

Each tile index contain the following attribute fields:

• TILE - the image tile name
• PATH - the directory where the DEM tile resides on the FTP site
• SIZE - the average file size of each tile
• Origin - the Ground Sample Distance (GSD) or resolution of the original imagery the data was auto-correlated from

The auto-correlated DEM tile indices are maintained by AGRC. Changes and updates are not planned to these datasets.

The native spatial reference for this dataset is UTM Zone 12N, NAD83 (0.01 meter coordinate precision).

There are no constraints or warranties with regard to the use of this dataset. Users are encouraged to attribute content to: State of Utah, SGID.

Related Resources

• Download Elevation and Terrain Data

Comments, questions, compliments, or concerns can be directed to Rick Kelson from AGRC at RKelson@utah.gov.