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Post by rocket2 on Oct 1, 2021 13:45:11 GMT -5
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Post by BaconJunkie1 on Oct 24, 2021 15:06:27 GMT -5
Sometimes this works .... Do a Google search using this "utm zone Marana, AZ". try the links it finds and look for the UTM code. Enter 269 and the UTM zone code. In this case it's 12, so enter 26912. Like I said "Sometimes this works" ... Good luck www.countrycoordinate.com/city-marana-united-states/ |
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mal
Amateur Golfer
Posts: 214
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Post by mal on Oct 24, 2021 15:52:53 GMT -5
Or... you could open the file with lastools and know exactly what the correct EPSG code is.
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Post by BaconJunkie1 on Oct 24, 2021 16:37:42 GMT -5
Or... you could open the file with lastools and know exactly what the correct EPSG code is. Tried that once and couldn't see what we were supposed to look at to find it, maybe a bad file or loose nut on my keyboard  Time to re-visit it again because I would sure like to know and help others too. |
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mal
Amateur Golfer
Posts: 214
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Post by mal on Oct 24, 2021 16:42:22 GMT -5
Use lasinfo.exe And read the lasinfo_README.txt to understand how to use it.
Find the ESPG code related to the X/Y coordinates. Below is an example cut from a txt output not related to the above request. The ESPG I have highlighted in red is the one you would want to use. Most all laz files will output in the same, or similar format.
,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"]]]
Teach a man to fish...
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Post by BaconJunkie1 on Oct 24, 2021 17:51:28 GMT -5
Hey Mal that's my favorite saying!  Thanks for the info, it seems like I did the same thing shown in the video linked below but this time it worked. My sample .LAZ file that used returned 10 EPSG codes, at least trying them all until one works narrows down the field quite a bit or by looking at can you tell which to use? For others looking to figure this stuff out, That video cover a lot more than just how to read LAS/LAZ files. There is some really good fish, ooops I mean stuff in there. COMPD_CS["NAD83(2011) / California zone 4 (ftUS) + NAVD88 height - Geoid12B (ftUS)",PROJCS["NAD83(2011) / California zone 4 (ftUS)",GEOGCS["NAD83(2011)",DATUM["NAD83_National_Spatial_Reference_System_2011",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG"," 7019"]],AUTHORITY["EPSG"," 1116"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG"," 8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG"," 9122"]],AUTHORITY["EPSG"," 6318"]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["standard_parallel_1",37.25],PARAMETER["standard_parallel_2",36],PARAMETER["latitude_of_origin",35.33333333333334],PARAMETER["central_meridian",-119],PARAMETER["false_easting",6561666.667],PARAMETER["false_northing",1640416.667],UNIT["US survey foot",0.3048006096012192,AUTHORITY["EPSG"," 9003"]],AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG"," 6422"]],VERT_CS["NAVD88 height - Geoid12B (ftUS)",VERT_DATUM["North American Vertical Datum 1988",2005,AUTHORITY["EPSG"," 5103"]],UNIT["US survey foot",0.3048006096012192,AUTHORITY["EPSG"," 9003"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG"," 6360"]]] Read what Mal posted then watch and learn |
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mal
Amateur Golfer
Posts: 214
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Post by mal on Oct 24, 2021 19:08:30 GMT -5
6422 is the correct EPSG code. Always the one associated with the XY coordinates.
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Post by BaconJunkie1 on Oct 24, 2021 19:29:49 GMT -5
Thanks Mal, I had searched for an answer before and didn't see one, in the pastI've even read every post Chad has made on here trying to figure how to get these dadgum codes. I'll be able to sleep tonight with this victory over the elusive EPSG codes, thanks again! What's odd is the code that I used for the course in that sample that the .LAZ file belongs to was 2228 and it's not even listed in that metadata ... strange but that's a problem for another day .... |
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mal
Amateur Golfer
Posts: 214
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Post by mal on Oct 24, 2021 20:06:19 GMT -5
Chad didn't really ever get into describing how to use other software tools since it leads to too many additional questions that go beyond the scope of his tool. The metadata file usually NEVER has the EPSG code needed to align things up for Mapquest (where chadstool retrieves the proper coordinates from) and should be ignored. I've posted here before about my process to get correct and consistent results with chadtools and lidar. Feel free to use the search function.
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Post by rocket2 on Nov 5, 2021 3:16:28 GMT -5
Thanks guys for the info. I've been away for awhile but am getting back to it. I googled my way to the right EPSG code in this case. I'm now trying to get the right codes for Racine Wisconsin and Stevens Point Wisconsin. I've tried very google search I could with no luck from over 100 tries. I'll be trying the method described by mal. I'm tempted to pay chadgolf for the info at his website but I'm a bit concerned about the whole internet security issue on a site I'm totally clueless about. Thanks again for the info.
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Post by rocket2 on Nov 5, 2021 3:23:07 GMT -5
mal I used the the lasinfo tool and found the AZ EPSG code easily. But when I did the same for the Racine WI lidar files none of them had a reference to the Axis x/y info. Infact there were no references to any EPSG codes. What's up with that?
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mal
Amateur Golfer
Posts: 214
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Post by mal on Nov 5, 2021 6:21:33 GMT -5
mal I used the the lasinfo tool and found the AZ EPSG code easily. But when I did the same for the Racine WI lidar files none of them had a reference to the Axis x/y info. Infact there were no references to any EPSG codes. What's up with that? Post a link to the file in question. |
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Post by rocket2 on Nov 5, 2021 18:11:53 GMT -5
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mal
Amateur Golfer
Posts: 214
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Post by mal on Nov 6, 2021 7:07:29 GMT -5
Are you sure you are using lasinfo correctly? This file is in the exact format as the others. Here is the EPSG code.
AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","6455"
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Post by rocket2 on Nov 6, 2021 16:05:58 GMT -5
Great! I thought I used it correctly because I used it to get the AZ LIDAR / EPSG info correctly. I'll have to keep trying till I get the right ESPG that you sent and watch the tutorial again. Then I'll be going after the Stevens Point WI data for the SentryWorld course. Thanks for your help and patience. You definitely have me going close to the right path.
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Thanks for the info, it seems like I did the same thing shown in the video linked below but this time it worked. My sample .LAZ file that used returned 10 EPSG codes, at least trying them all until one works narrows down the field quite a bit or by looking at can you tell which to use?