2014 OLC FEMA Lidar: Sitka, Alaska

This record was created by the NOAA Office for Coastal Management (OCM) because no metadata record or data report were available for the data. Information to create this record was found in the Quantum Spatial (WSI) lidar report. A link to this report is provided in the URL section below.

The NOAA Office for Coastal Management (OCM) downloaded this lidar data from the AK DGGS site (https://elevation.alaska.gov/) and processed the data to be available on the Digital Coast Data Access Viewer (DAV). OCM noted that there are many points over water that are classified as ground. OCM processed all points to the Digital Coast Data Access Viewer (DAV).

WSI, a Quantum Spatial Company, has completed the acquisition and processing of Light Detection and Ranging (LiDAR) data of the Oregon LiDAR Consortium (OLC) Alaska FEMA Sitka Survey, for the Oregon Department of Geology and Mineral Industries (DOGAMI). The OLC Alaska FEMA Sitka project area (AOI) encompasses approximately 7,200 acres. Total area flown (TAF) is approximately 9,245 acres. WSI acquired data from May 16 - May 22, 2014. Settings for LiDAR data capture produced an average resolution of at least eight pulses per square meter.

The collection of high resolution geographic data is part of an ongoing pursuit to amass a library of information accessible to government agencies as well as the general public.

Any conclusions drawn from the analysis of this information are not the responsibility of AK DGGS, NOAA, the Office for Coastal Management or its partners.

Data is available online for custom or bulk downloads.

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.

Microsoft Windows 7; ESRI ArcCatalog 9.3.1.1850

Not provided

Vertical Accuracy reporting is designed to meet guidelines presented in the National Standard for Spatial Data Accuracy (NSSDA) (FGDC, 1998) and the ASPRS Guidelines for Vertical Accuracy Reporting for LiDAR Data V1.0 (ASPRS, 2004). The statistical model compares known ground check points to the closest laser point. Vertical accuracy statistical analysis uses ground control points in open areas where the LiDAR system has a “very high probability” that the sensor will measure the ground surface and is evaluated at the 95th percentile. For the OLC Alaska FEMA Sitka study area 317 GCP points were collected. Statistics are calculated on the cumlative sum of all points collected for all deliveries. For this project, no independent survey data were collected, nor were reserved points collected for testing. As such, vertical accuracy statistics are reported as “Compiled to Meet.” Vertical Accuracy is reported for the entire study area. The RMSE is 0.03 m.