# Generate DSM without Re-Running Step 3

**URL:** <https://community.pix4d.com/t/generate-dsm-without-re-running-step-3/18041>\
**Category:** PIX4Dmapper\
**Created:** [May 12, 2021, 8:48pm UTC](https://community.pix4d.com/t/generate-dsm-without-re-running-step-3/18041 "2021-05-12T20:48:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ameyer](https://avatars.discourse-cdn.com/v4/letter/a/34f0e0/32.png) [@ameyer](https://community.pix4d.com/u/ameyer)\
**Post date:** [May 12, 2021, 8:48pm UTC](https://community.pix4d.com/t/generate-dsm-without-re-running-step-3/18041/1 "2021-05-12T20:48:51Z")

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I have generated an orthomosaic of a 600-acre area and now need to generate the DSM. I can see all of the tiles for the DSM in the 3\_dsm\_ortho\1\_dsm\tiles folder. Is Mapper able to stitch the tiles together without re-running Step 3 (which takes quite a while)?

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**Author:** ![Yuka](https://avatars.discourse-cdn.com/v4/letter/y/9d8465/32.png) [@Yuka](https://community.pix4d.com/u/Yuka)\
**Post date:** [May 13, 2021, 4:35am UTC](https://community.pix4d.com/t/generate-dsm-without-re-running-step-3/18041/2 "2021-05-13T04:35:45Z")

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You can generate DTM and contour lines by clicking “Process” (see image 1); however, it is required to process step 3 to generate DSM. You can unselect boxes for orthomosaic generation and other options to process it faster (Image 2).

Image 1  
 ![image](https://global.discourse-cdn.com/pix4d/original/2X/4/4e26f6efd0fb78650b5efbf4e2f0b5abdb267fda.png)

Image 2

 ![image](https://global.discourse-cdn.com/pix4d/original/2X/a/abc1cc91611be9efed097920e70cfac0fc61e174.png)

Kind regards,

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<div class="post-metadata">

**Author:** ![ameyer](https://avatars.discourse-cdn.com/v4/letter/a/34f0e0/32.png) [@ameyer](https://community.pix4d.com/u/ameyer)\
**Post date:** [May 13, 2021, 2:50pm UTC](https://community.pix4d.com/t/generate-dsm-without-re-running-step-3/18041/3 "2021-05-13T14:50:02Z")

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Thank you Yuka.

That’s what I thought I would have to do since I didn’t see any other way. I just saw that the DSM tiles were already created and was hoping there was a way to stitch them into one without re-running step 3.

-Aaron