New Zealand EPSG

[alangreenspun]

Does anyone have any NZ code or codes that work?  Im trying to do Paraparam and drawn a blank thus far... 2193 in the metadata doesnt work, of course.. 

[alangreenspun]

Does anyone know who is building New Zealand LIdAR courses?

[BaconJunkie1]

When extracting the data from the .laz file in LASTools, normally it's the 1st EPSG code after the word NORTH but this time it has East between NORTH and a code (I've never seen that before) which is the code you tried and it failed (I got the same results as you). Sometimes and it's very rare but you can leave the box blank and it will get the code from the .laz file but not this time. Another method is to Google this for the closest city "UTM code for Wellington NZ" which is 60, enter 269 and the 60 into the box for 26960 but that didn't work. 

You might try some of these that are near the course
spatialreference.org/ref/epsg/?search=new+zealand&srtext=Search

insert quote herelasinfo (210720) report for 'C:\LAStools\My LAZ Files\points.laz'

reporting all LAS header entries:

file signature: 'LASF'

file source ID: 0

global_encoding: 17

project ID GUID data 1-4: 00000000-0000-0000-0000-000000000000

version major.minor: 1.4

system identifier: 'LAStools (c) by rapidlasso GmbH'

generating software: 'las2las (version 210720) + OT'

file creation day/year: 139/2023

header size: 375

offset to point data: 2363

number var. length records: 2

point data format: 6

point data record length: 30

number of point records: 0

number of points by return: 0 0 0 0 0

scale factor x y z: 0.001 0.001 0.001

offset x y z: 1700000 5000000 0

min x y z: 1766770.933 5471021.826 -0.848

max x y z: 1768460.313 5472212.196 46.225

start of waveform data packet record: 0

start of first extended variable length record: 11756153

number of extended_variable length records: 0

extended number of point records: 49631741

extended number of points by return: 43011105 5517421 925217 155711 22287 0 0 0 0 0 0 0 0 0 0

variable length header record 1 of 2:

reserved 0

user ID 'LASF_Projection'

record ID 2112

length after header 940

description 'OGC Transformation Record'

WKT OGC COORDINATE SYSTEM:

COMPD_CS["NZGD2000 / New Zealand Transverse Mercator 2000 + NZVD2016 height",PROJCS["NZGD2000 / New Zealand Transverse Mercator 2000",GEOGCS["NZGD2000",DATUM["New_Zealand_Geodetic_Datum_2000",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6167"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4167"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",173],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",1600000],PARAMETER["false_northing",10000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Northing",NORTH],AXIS["Easting",EAST],AUTHORITY["EPSG","2193"]],VERT_CS["NZVD2016 height",VERT_DATUM["New Zealand Vertical Datum 2016",2005,AUTHORITY["EPSG","1169"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","7839"]]]

variable length header record 2 of 2:

reserved 0

user ID 'liblas'

record ID 2112

length after header 940

description 'OGR variant of OpenGIS WKT SRS'

LASzip compression (version 3.4r3 c3 50000): POINT14 3

reporting minimum and maximum for all LAS point record entries ...

X 66770933 68460313

Y 471021826 472212196

Z -848 46225

intensity 16 65520

return_number 1 5

number_of_returns 1 5

edge_of_flight_line 0 0

scan_direction_flag 0 1

classification 1 17

scan_angle_rank -24 24

user_data 1 1

point_source_ID 136 147

gps_time 299635531.630046 299639031.692918

extended_return_number 1 5

extended_number_of_returns 1 5

extended_classification 1 17

extended_scan_angle -4000 4000

extended_scanner_channel 0 0

number of first returns: 43011105

number of intermediate returns: 1091940

number of last returns: 44118440

number of single returns: 38589744

overview over extended number of returns of given pulse: 38589744 8224107 2195557 514748 107585 0 0 0 0 0 0 0 0 0 0

histogram of classification of points:

58019 unclassified (1)

14068613 ground (2)

20951785 low vegetation (3)

6387002 medium vegetation (4)

1048216 high vegetation (5)

6979246 building (6)

136086 water (9)

2774 bridge deck (17)

+-> flagged as extended overlap: 30459430

+---> 35886 of those are unclassified (1)

+---> 8146080 of those are ground (2)

+---> 13237595 of those are low vegetation (3)

+---> 3961754 of those are medium vegetation (4)

+---> 641887 of those are high vegetation (5)

+---> 4398290 of those are building (6)

+---> 36307 of those are water (9)

+---> 1631 of those are bridge deck (17)

[alangreenspun]

Much appreciate your reply and explanation on how to find epsg code and thanks for trying to find mine. Been through all Spatref codes with no joy, so frustrating as I know there are NZ courses on the game produced from LiDAr data.

[BaconJunkie1]

Yes sir, I love well done LiDAR courses so I'm glad to help out when I can.  

Top 100 NV Courses .... There are some nice one, Cape Kidnapper's is really interesting
www.top100golfcourses.com/golf-courses/oceania/new-zealand

[nzgolfer]

the way to sort it is to change the co-ordinates within the points export. The way to fix it is by doing the following:

a) Download Lastools from here and unzip the file:
rapidlasso.com/lastools/

b) Copy your export into the folder called bin in lastools

c) Open Command Prompt (type CMD into the search bar)

d) Navigate to the bin folder within lastools on Command Prompt - likely type in:
cd \downloads\lastools\bin

e) It's likely that your file is called points.laz, if so enter the following command into Command Prompt:
las2las -i points.laz -target_epsg 32760 -o points_new.laz
This will give you a warning:
SERIOUS WARNING: horizontal datum of source and target incompatible
Ignore it - it will take a few seconds and then eventually, your command line will come back in Command Prompt, meaning that it's completed

f) That's it! Done. Copy your new file (points_new.laz) into your directory that you are using for your courses file and you're good to go!

Hope that helps - let me know how you get on!

[dmoney4797]

Excellent! This is a great tip! Thanks nzgolfer.