The Texas Natural Resources Information System (TNRIS) is pleased to announce the release of approximately 6,570 square miles of newly acquired high resolution lidar data for portions of Central Texas. This project was managed by the Texas Strategic Mapping (StratMap) Program and utilized the StratMap Contracts held by the Department of Information Resources (DIR). Collection took place during the leaf-off season in Texas.
The StratMap contributing partners for this project were the Texas Water Development Board (TWDB), U.S. Geological Survey (USGS), Natural Resources Conservation Service (NRCS), U.S. Fish and Wildlife Service (USFWS), Williamson County, San Antonio River Authority, City of San Marcos and the City of Round Rock. Lidar acquired from this project will be used for floodplain management and planning, feature extraction, water quality modeling, stream restoration potential analysis, change detection, 9-1-1, wildfire mitigation, habitat identification/modeling for endangered species, and dam safety. The project Area of Interest covers areas where previous lidar acquisition did not meet USGS Quality level 2 data specifications.
Further details regarding these acquisitions can be found by downloading the Project Report(s) found in their DataHub entries.
View coverage areas in the interactive map below:
Please see our Lidar status map for statewide lidar coverage.
Vertical NVA RMSEz tested ~3.37 cm for the San Antonio block and ~5.35 cm in the La Grange/ Austin block. The tested accuracy in all areas exceeds the project specification for 10 cm.
Average first-return point density is slightly over 4 points per square meter (ppsm) in all areas of interest, meeting the 4 ppsm project specification.
Point data is classified according to the following American Society for Photogrammetry and Remote Sensing (ASPRS) class schema:
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