EPSG Help: San Antonio, Texas

[DragonAggie95]

rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_TX_Central_B2_2017_LAS_2019/laz/USGS_LPC_TX_Central_B2_2017_stratmap17_50cm_2998371a2_LAS_2019.laz

Checked spatialreference.org/ref/?page=2&search=texas and none of those work.

First, can someone here help me find the correct EPSG?
Second, can same person show me exactly how they found that info?

[BaconJunkie1]

That's the EPSG you are looking for. Using the method I use, it's the EPSG that follows the word "North" but when using LASTools the .txt file doesn't always give the EPSG and you would have to resort to the method you tried. You can also Google "UTM zone (THIS CITY]" and maybe get a 2 digit number, add 269 to it (example 26917) or just leave the EPSG box empty and see what happens.

 hereerse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-99],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","6343"]],VERT_CS["NAVD88 height - Geoid12B (metre)",VERT_DATUM["North American Vertical Datum 1988",2005,AUTHORITY["EPSG","5103"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","5703"]]]

variable length header record 2 of 3:

This is involved but once it set it up, it's like a 4 step easy 1 minute process to do others.

How To Use LASTools to get a EPSG from a LAS/LAZ file

First off, a LAZ file is just a compressed file with many LAS files inside of it.

- Go to your C drive in Window’s Explorer.

- Right click in a blank area and make a new folder named LASTools.

- In Windows Explorer go to “View” up above the files section>Show/Hide check the “File name extensions” box, now the .exe, .txt, … etc parts of the filenames should show.

- Go to this site and download LASTools to that folder that you made

rapidlasso.com/lastools/ or move the LASTools.zip file to that folder after it downloads to wherever you downloaded it to … It usually goes to the “Downloads” folder.

- Now that the .zip file is downloaded and in the LASTools folder, go inside the LASTools folder that you made, right click on the LASTools.zip file and use the extract here option.

- Once it extracts the files and inside of that same folder, right click in a blank area and make another new folder named My LAZ Files to put the LAZ/LAS files into that that you want to read. Put your downloaded LAS/LAZ file into that folder, you just need 1 of them.

- Go to the “bin” folder inside of the LASTools folder and find “lasinfo.exe”. (the .exe part may not show if you don’t have that option turned on in Windows Explorer like I showed you up above)

- Double left click the “lasinfo.exe” to open the program

- Left click the “Browse” button

- Double left click the “\..” button

- Drag down or down arrow to the My LAZ Files folder that you made and double left click it

- Double left click the LAS/LAZ file that you want to read (later on empty this folder after you have found the correct EPSG file) and you should see a big turquoise box.

- Over on the right side, left click on “Output Options”, tick the “*_info.txt” box and click the “Output Options” to close it.

- Look below there and near the bottom and click the “Run32” button and another window will open

- Click “START” and it will read the LAZ/LAS file and add a .txt file inside the “My LAZ Files” folder

- Go to the “My LAZ Files” folder and double left click the .txt file to read it and the correct EPSG code should be the one after the “AXIS X East AXIS Y North” parts. Example: AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","6434" …. 6434 should be it.

- AFTER YOU HAVE YOUR COURSE IN THE GAME …. Empty the My LAZ Files folder after you have found the correct EPSG file to make finding the LAS/LAZ file that you want to read easier to find the next time.

[DragonAggie95]

Awesome! Thank you!