# Processing issue Step 1 and Step 2 densification **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [October 31, 2018, 11:48am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463 "2018-10-31T11:48:36Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [October 31, 2018, 11:48am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/1 "2018-10-31T11:48:36Z")
Images (GoPro Hero4Black 3.0 3000x2250 RGB) used for initial processing (Step 1) were taken in wide mode. I thought a data display issue or a graphics card driver not up to date but it seems that this is not the case As you will see in the images attached below, the LAS file generated in Step 2 is not good. In XYZ export, it’s the same problem. The points of densification of the cloud are not random, they are on in lines (spaced in X of 6 cm and spaced in Y of 50 cm). The images come from GoPro 4 (WIDE mode), we do not use the Pixhawk flight logs, we have failed with GCP points from a geometer survey. Do you know where this “bug” comes from? Thank you in advance for your clarification. **STEP 1:** **STEP 2:** **Densified point cloud in Global Mapper** : ---
**Author:** ![Cristina\_Timofte](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/cristina_timofte/32/221_2.png) [@Cristina\_Timofte](https://community.pix4d.com/u/Cristina_Timofte)\ **Post date:** [November 2, 2018, 2:59pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/2 "2018-11-02T14:59:19Z")
Hi Alain, Has the project been created with the same version as it was processed? Example: created in 4.3X and processed in the same one? We have observed a similar isolated case when the project has been initially created in 3.X.X  and then re-processed in 4.X.X. If this is the case could you please try to re-create the project from scratch in the latest available version and process step 1 and 2 and see if this behavior persists? Best, Ina ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 5, 2018, 5:28pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/3 "2018-11-05T17:28:24Z")
Hi Ina, Thank you for answering me I actually created the project with version 4.1.25 of Pix4 D and then re-processed step 1 and 2 with versions 4.2.27 and 4.3.31. I will try to re-create the project from scratch in the latest available version and I will keep you informed. Best, Alain ---
**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\ **Post date:** [November 12, 2018, 10:23am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/4 "2018-11-12T10:23:58Z")
Hi, Can you let us know if you were able to reprocess the project with 4.3.31? 🙂 What are your results?  Cheers! ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 13, 2018, 11:09am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/5 "2018-11-13T11:09:29Z")
Hi, First, I tried to reprocess the project with 4.2.27 and today I have the same trouble. Non densified cloud Densified cloud Today, I will try with 4.3.31. Best Alain   ---
**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\ **Post date:** [November 13, 2018, 12:50pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/6 "2018-11-13T12:50:41Z")
Hi Alain, Thank you for getting back to us.  Let us know once you have the results from 4.3.31. Best ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 16, 2018, 1:21pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/7 "2018-11-16T13:21:11Z")
Hi, The results after the Step 1 are not good. (processed with 4.3.31) If I do not add GCP after Step 1, the non densified cloud is ok but if I add GCP and I Reoptimize, the non densified cloud is not ramdom. Look for the following screen capture:   Best Alain ---
**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\ **Post date:** [November 19, 2018, 9:50am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/8 "2018-11-19T09:50:32Z")
Hi Alain, Can I ask you to share this project with us? Our team will investigate the issue! 🙂 Thank you in advance ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 19, 2018, 11:27am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/9 "2018-11-19T11:27:31Z")
Hi Beata, Our project is on the Pix4DCloud: [https://cloud.pix4d.com/pro/project/392950/map?shareToken=53a623fa-513b-4608-a594-c4332219fd86](https://cloud.pix4d.com/pro/project/392950/map?shareToken=53a623fa-513b-4608-a594-c4332219fd86) [https://cloud.pix4d.com/pro/project/392950/map?shareToken=5301e95a-95e5-43cb-9ff3-c13873a2d4ab](https://cloud.pix4d.com/pro/project/392950/map?shareToken=5301e95a-95e5-43cb-9ff3-c13873a2d4ab) Thank you Alain ---
**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\ **Post date:** [November 19, 2018, 12:12pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/10 "2018-11-19T12:12:26Z")
Thank you very much! I will come back to you as soon as I have some news. Cheers ---
**Author:** ![Amritha\_Narayanan](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/amritha_narayanan/32/4203_2.png) [@Amritha\_Narayanan](https://community.pix4d.com/u/Amritha_Narayanan)\ **Post date:** [November 28, 2018, 4:41pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/11 "2018-11-28T16:41:32Z")
Hi there Alain. Thanks for uploading your project to the cloud. Unfortunately, the project doesn’t have the GCPs and we cannot reproduce the issue unless we have them. Could you please send us the GCP coordinates file? Or even just paste the coordinates in this thread? We are investigating the issue and we’ll keep you posted. Thanks heaps! Best regards Amritha (Pix4D Test engineer) ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 28, 2018, 5:07pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/12 "2018-11-28T17:07:29Z")
Hi Amritha, Here is the measured gcps position from 1\_initial\_params: 962528.73600000003352761269  4679332.37700000032782554626  5.57000000000000028422 962513.94099999999161809683  4679366.65799999982118606567  2.47000000000000019540 962491.59299999999348074198  4679365.10500000044703483582  6.61000000000000031974 962540.71400000003632158041  4679358.62999999988824129105  2.24000000000000021316 962572.36899999994784593582  4679404.31199999991804361343  1.17999999999999993783 962583.51199999998789280653  4679400.37200000043958425522  1.41999999999999992895 962584.87300000002142041922  4679401.41000000014901161194  1.25000000000000000000 962585.74899999995250254869  4679400.22800000011920928955  1.36000000000000009770 962584.34900000004563480616  4679399.17300000041723251343  1.38999999999999990230 962583.90899999998509883881  4679425.57000000029802322388  0.61999999999999999556 962636.78899999998975545168  4679438.56500000040978193283  1.38999999999999990230 962588.06599999999161809683  4679461.18699999991804361343  0.76000000000000000888 962588.37399999995250254869  4679491.92300000041723251343  0.71999999999999997335 962587.32200000004377216101  4679534.06599999964237213135  0.79000000000000003553 962701.98699999996460974216  4679515.77799999993294477463  1.25000000000000000000 962742.06700000003911554813  4679517.83000000007450580597  3.87999999999999989342 962623.61399999994318932295  4679586.68499999959021806717  0.93000000000000004885 962642.77099999994970858097  4679578.11799999978393316269  1.01000000000000000888 962687.74899999995250254869  4679576.82299999985843896866  0.95999999999999996447 962706.27599999995436519384  4679574.34900000039488077164  2.62999999999999989342 962680.82099999999627470970  4679608.08700000029057264328  2.27000000000000001776 Here is the estimated\_gcps\_position from 1\_initial\_params: 0, 962528.75248984445352107286, 4679332.36160616297274827957, 5.52988149239296955528 2, 962491.57524972106330096722, 4679365.12647271435707807541, 6.61622156345513001696 5, 962583.50459214905276894569, 4679400.38250207714736461639, 1.42291189813233498462 9, 962583.94103543518576771021, 4679425.56980424746870994568, 0.61039659415260505426 10, 962636.77780134743079543114, 4679438.55778922885656356812, 1.39495989422877175734 12, 962588.36662184179294854403, 4679491.91802635509520769119, 0.70217278682507833221 14, 962702.00457477755844593048, 4679515.78200196381658315659, 1.23893470155015839040 15, 962742.01065406959969550371, 4679517.84080024715512990952, 3.85121609779867846157 16, 962623.58481595665216445923, 4679586.68697658833116292953, 0.86834117065646931888 19, 962706.29357602179516106844, 4679574.35197771433740854263, 2.69089847670651050038 20, 962680.82856852817349135876, 4679608.10015064571052789688, 2.24415430981135832766 I hope it will help you. Thanks Alain   ---
**Author:** ![Amritha\_Narayanan](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/amritha_narayanan/32/4203_2.png) [@Amritha\_Narayanan](https://community.pix4d.com/u/Amritha_Narayanan)\ **Post date:** [November 29, 2018, 10:57am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/13 "2018-11-29T10:57:09Z")
Thanks for sharing this information Alain. But could you please provide us with the initial GCPs that you used and not the ones that were generated after calibration? Also if you could please send us over the GCP and output coordinate system that you used? The images in your project are not geotagged.   Thanks and best regards Amritha ---
**Author:** ![Alain\_Juif](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/alain_juif/32/256_2.png) [@Alain\_Juif](https://community.pix4d.com/u/Alain_Juif)\ **Post date:** [November 30, 2018, 3:42pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/14 "2018-11-30T15:42:41Z")
Hi, The initial  GCPs we used : (the output coordinate system is North UTM31 WGS84) 962528.736,4679332.377,5.57 962513.941,4679366.658,2.47 962491.593,4679365.105,6.61 962540.714,4679358.63,2.24 962572.369,4679404.312,1.18 962583.512,4679400.372,1.42 962584.873,4679401.41,1.25 962585.749,4679400.228,1.36 962584.349,4679399.173,1.39 962583.909,4679425.57,0.62 962636.789,4679438.565,1.39 962588.066,4679461.187,0.76 962588.374,4679491.923,0.72 962587.322,4679534.066,0.79 962701.987,4679515.778,1.25 962742.067,4679517.83,3.88 962623.614,4679586.685,0.93 962642.771,4679578.118,1.01 962687.749,4679576.823,0.96 962706.276,4679574.349,2.63 962680.821,4679608.087,2.27 Thanks and best regards ---
**Author:** ![Thomas\_De\_Brito](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@Thomas\_De\_Brito](https://community.pix4d.com/u/Thomas_De_Brito)\ **Post date:** [January 15, 2019, 4:35pm UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/15 "2019-01-15T16:35:43Z")
Bonjour, j’ai le même problème, avez-vous trouvé la solution? Merci ---
**Author:** ![Beata](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/beata/32/187_2.png) [@Beata](https://community.pix4d.com/u/Beata)\ **Post date:** [January 16, 2019, 9:26am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/16 "2019-01-16T09:26:06Z")
Bonjour Tomas, Pouvez-vous vérifier que votre carte graphique est bien à jour? ---
**Author:** ![Thomas\_De\_Brito](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@Thomas\_De\_Brito](https://community.pix4d.com/u/Thomas_De_Brito)\ **Post date:** [January 16, 2019, 10:49am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/17 "2019-01-16T10:49:07Z")
Bonjour, oui ma carte est à jour. Quand je géoreference avec le système de coordonnées de sortie arbitraire, cela fonctionne : mais quand je bascule dans le système RGF / Lambert 93 cela me créé ceci : donc cela génère ce nuage, ce n’est pas bien grave au final car quand je lis le fichier .las sur CloudCompare le nuage est bon. Donc es-ce un bug d’affichage lié au système de coordonnée ?  Merci    ---
**Author:** ![Pix4D\_Alumni\_MV](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pix4d_alumni_mv/32/2071_2.png) [@Pix4D\_Alumni\_MV](https://community.pix4d.com/u/Pix4D_Alumni_MV)\ **Post date:** [January 23, 2019, 8:27am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/18 "2019-01-23T08:27:28Z")
Cher Thomas, Merci pour ton partage. Pour l’instant je ne peux pas vraiment t’indiquer l’orgine du bug. Toutefois nos développeurs seraient intéressés par jeter un coup d’oeil à ton projet afin de tenter de reproduire l’erreur pour en comprendre l’origine. Est-ce que tu pourrais partager avec nous le fichier \*.p4d, toutes tes images et le fichier \*.log? Tu peux les charger ici: [One drive](https://pix4d365-my.sharepoint.com/:f:/g/personal/marco_verdon_pix4d_com/Ekt2zjoUvfFOs3X0UffWekUB_JNOIUrQe1929H-lMYP64g?e=FA9w3l) Merci d’avance! Cordialement ---
**Author:** ![Jeremy\_IMBERT](https://avatars.discourse-cdn.com/v4/letter/j/49beb7/32.png) [@Jeremy\_IMBERT](https://community.pix4d.com/u/Jeremy_IMBERT)\ **Post date:** [February 7, 2019, 7:21am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/19 "2019-02-07T07:21:33Z")
Bonjour Il se trouve que j’ai le même problème sur différents projets. Merci ---
**Author:** ![Gael](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/gael/32/187_2.png) [@Gael](https://community.pix4d.com/u/Gael)\ **Post date:** [February 8, 2019, 7:34am UTC](https://community.pix4d.com/t/processing-issue-step-1-and-step-2-densification/7463/20 "2019-02-08T07:34:12Z")
Bonjour Jérémy, Pouvez vous partager un projet avec nous avec le fichier \*.p4d, toutes tes images et le fichier \*.log? Tu peux les charger ici: [one drive](https://pix4d365-my.sharepoint.com/:f:/r/personal/marco_verdon_pix4d_com/Documents/Marco_Users/Community/processing-issue-step1-step-2-360004355511?csf=1&e=ZVVxIl) Merci d’avance! Cordialement