LiDAR / Aerial Imagery

LiDAR is an acronym for Light Detection and Ranging. A laser,  mounted in an airplane, is pointed at the ground and the reflection of the laser beam back from the ground returns the airplane’s height above the ground. The return of a thousand laser reflection points paints a representation of the ground’s terrain or the physical features of a landscape. A million points form a very accurate point-cloud map of the terrain.

Aerial Imagery (photos taken from airplanes) and Satellite Imagery (images taken from orbit around the earth) help to visualize the earth’s terrain and the objects (buildings for example) on the terrain.

For acquiring LiDAR and Imagery, SARA collaborates with partners that include the Texas Natural Resource Information Systems (TNIRS)/Texas Water Development Board (TWDB).

The dates of available LiDAR data sets are between March 2010 and November 2011. This acquisition covers approximately 1,870 square miles and includes all of Bexar County with edge coverage of Bandera, Kendall, Comal, Guadalupe, Wilson, Atascosa, and Medina Counties.

This acquisition’s mission was primarily to support FEMA flood mapping projects. But through the assistance of EarthEye, terrain contours are available for the same area.


Disclaimer Users are responsible for determining the proper use and application of these data. The San Antonio River Authority makes no guarantees, representations or warranties of any kind, express or implied, arising by law or otherwise, including but not limited to, content, quality, accuracy, completeness, effectiveness, reliability, and fitness for a particular purpose, usefulness, use or results to be obtained from this information. The San Antonio River Authority assumes no responsibility for damages or other liabilities due to the accuracy, availability, loss of data, use or misuse or the data herein, lost profits, business interruption, loss of business information, or any other pecuniary loss that might arise from the use of the contour data layers (LiDAR derived products). These data layers are produced out of LIDAR data that represent the ground conditions at the time of acquisition only and spatio-temporal effects may exist within due to the time span and spatial variation of the data acquisition. This disclaimer applies both to individual and aggregate use of the data layers with other data and/or any derived products.