Houston-Galveston Area Council (H-GAC) 2008 Lidar

Date(s): Coverage Availability/Geographic Extent: Footprint: Source(s):
2008 All of Harris county and portions of Brazoria, Chambers, Fort Bend, Galveston, Grimes, Montgomery and Waller. 1/4 USGS Quadrangle HGAC (Vendord - Merrick & Company)

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Houston-Galveston Area Council (H-GAC) 2008 Lidar is in the public domain and available from the Research and Distribution Center for the cost of reproduction.

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Data Details

Available Formats: LAS,Shapefile,DEM
Alternative Data: 5ft Hydro-flattened DEM, 3D Breaklines
Derivative Data: 1ft and 5ft Contours
Known Issues: None
Recommended Uses: Research, Analysis
Spatial Reference:

EPSG 2919


The Houston-Galveston Area Council contracted with Merrick & Company to fly 3,695 square mile project area. The purpose of the data was for numerous GIS applications including flood modeling and prevention. Lidar was collected using Merrick's ALS50 Phase 2 sensor. The The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points and water. The data was next taken into MARS to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter.

Lidar data for Texas is made available online through the use of data compression using LASTools. LASTools is an open-source collection of tools for lidar data viewing and manipulation. TNRIS uses the LASzip portion of LASTools for compression\decompression. LASTools provides a lossless compression of the data from las to laz formats.

  • Software with native LAZ support
  • ERDAS IMAGINE (14.1 and up) by Hexagon Geospatial
  • Global Mapper (13.1 and up) by Blue Marble Geo
  • ENVI LiDAR (5.1 and up) by Exelis VIS
  • FME (2012 and up) by Safe Software
  • LAStools by rapidlasso
  • plas.io 3D Web Viewer by Hobu Inc.
  • FUSION (3.40 and up) by Bob McGaughey of the USDA
  • Voyager (1.3 and up) by Voyager GIS
  • GRASS GIS (7.0 and up) by Open Source Geospatial Foundation (OSGeo)

Supplemental Information

Tile Index: Download File
Project Report(s): Download File
Lidar Breaklines: Download File