Optech fixed LMS exports of LAS 1.3 FWF (tested for Gemini & Pegasus digitizers)

[Martin Isenburg]

Hello,

 

it seemed like an Odysee (those involved in the process will know what I mean (-;) but the latest release of Optech's LMS is finally able to export proper and LAS specification conform full waveform LiDAR using the FWF extension of LAS 1.3  (e.g. point types 4 and 5). I have checked correctness for two strips flown here in the Philippines, one by a Gemini and the other by (one beam/channel of) a Pegasus. The Aquarius check is still in progress.

 

The attached images show that the waveforms go clearly through the different returns. There are up to five returns per shot and you can see nicely how the digitized waveforms connect them (red=first, blue=last, green=intermediate). This visualization is done using lasview by pressing <s> to get the first few points, then <W> to turn on the full waveform display and then <i> while hovering above a point to select different sets of points for which to display the waveforms.

 

The two files both pass the lasvalidate check with flying colors. Even the CRS info is correct. The lasinfo reports for both files are attached. Below the first two points and the waveform they reference as converted to ASCII text with las2txt.

 

Big thanks to Joida from the DREAM LiDAR team at the University of the Philippines in Manila for preparing all the test data sets needed to iron out the bugs including the latest ones reported here and also to the LMS software engineering and product release teams at Optech for - if with a few month delay - getting a fixed LMS version out the door.

 

Regards,

 

Martin @rapidlasso

 

--

http://rapidlasso.com - fast tools to fully waveform your LiDARs

 

// GEMINI

C:\Users\Public\wavefrms\926G>las2txt.exe -i L2-1-J_926G_newlmsv-S1-C1_s_w.las -parse txyzrnWV -stdout | more
72675199.002003 219883.16 1636466.17 246.00 1 2 1 60 216 32553 -3.36724e-007 -4.80857e-005 0.000141974 16 108 204 201 202 202 204 206 207 210 209 209 211 215 213 211 209 209 209 210 213 220 235 254 272 290 310 334 359 386 419 452 478 497 509 514 510 501 489 473 453 432 410 391 381 380 384 391 402 425 459 508 571 638 699 761 822 873 906 931 947 959 962 957 944 926 902 873 842 811 774 730 687 646 603 555 511 476 442 406 374 346 322 303 288 275 262 250 242 233 225 221 215 211 209 206 202 201 201 204 203 200 198 200 197 196 194 193 192 192
72675199.002003 219883.17 1636467.44 242.25 2 2 1 276 216 58996 -3.36733e-007 -4.80858e-005 0.000141974 16 108 204 201 202 202 204 206 207 210 209 209 211 215 213 211 209 209 209 210 213 220 235 254 272 290 310 334 359 386 419 452 478 497 509 514 510 501 489 473 453 432 410 391 381 380 384 391 402 425 459 508 571 638 699 761 822 873 906 931 947 959 962 957 944 926 902 873 842 811 774 730 687 646 603 555 511 476 442 406 374 346 322 303 288 275 262 250 242 233 225 221 215 211 209 206 202 201 201 204 203 200 198 200 197 196 194 193 192 192

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// PEGASUS

C:\Users\Public\wavefrms\941P>las2txt.exe -i L1-1-J_941P_newlmsv-S1-C1_s_w.las -parse txyzrnWV -stdout | more
72774580.501008 187238.96 1692714.96 114.32 1 2 1 60 176 32045 -3.11457e-005 -4.38957e-005 0.0001399 16 88 199 194 196 195 195 195 190 195 200 201 195 200 202 202 198 200 201 200 201 217 231 242 253 274 297 320 334 351 371 383 388 393 394 385 373 364 349 325 299 285 272 253 235 234 232 221 207 211 214 207 197 201 205 204 198 206 219 228 231 246 261 265 256 257 254 242 228 226 223 216 204 205 205 199 192 201 205 203 197 199 201 196 196 193 193 194 193 193
72774580.501008 187239.87 1692716.25 110.23 2 2 1 236 176 61309 -3.11457e-005 -4.38958e-005 0.0001399 16 88 199 194 196 195 195 195 190 195 200 201 195 200 202 202 198 200 201 200 201 217 231 242 253 274 297 320 334 351 371 383 388 393 394 385 373 364 349 325 299 285 272 253 235 234 232 221 207 211 214 207 197 201 205 204 198 206 219 228 231 246 261 265 256 257 254 242 228 226 223 216 204 205 205 199 192 201 205 203 197 199 201 196 196 193 193 194 193 193
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