# About the mosaicking result (shadow in DSM and ghost in orthomosaic image)

**URL:** <https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [November 24, 2017, 3:04am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260 "2017-11-24T03:04:50Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Jian\_Zhang](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@Jian\_Zhang](https://community.pix4d.com/u/Jian_Zhang)\
**Post date:** [November 24, 2017, 3:04am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/1 "2017-11-24T03:04:50Z")

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&nbsp;Hi,

I meet two problems need to help!

1. There is a shadow region in DSM, as below.

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1. The orthomosaic image shows ghost, as below.

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**Author:** ![Jian\_Zhang](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@Jian\_Zhang](https://community.pix4d.com/u/Jian_Zhang)\
**Post date:** [November 24, 2017, 3:06am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/2 "2017-11-24T03:06:14Z")

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Figure 1: Shadow in DSM for Question 1

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<div class="post-metadata">

**Author:** ![Jian\_Zhang](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@Jian\_Zhang](https://community.pix4d.com/u/Jian_Zhang)\
**Post date:** [November 24, 2017, 3:21am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/3 "2017-11-24T03:21:10Z")

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The overlap figure

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<div class="post-metadata">

**Author:** ![Jian\_Zhang](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@Jian\_Zhang](https://community.pix4d.com/u/Jian_Zhang)\
**Post date:** [November 24, 2017, 3:24am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/4 "2017-11-24T03:24:54Z")

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2D Keypoint Matches figure is as below. Thank you!

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**Author:** ![Selim\_Erguden](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/selim_erguden/32/337_2.png) [@Selim\_Erguden](https://community.pix4d.com/u/Selim_Erguden)\
**Post date:** [November 26, 2017, 12:37am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/5 "2017-11-26T00:37:25Z")

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Hey Jian,  
What settings are you using for DSM generation?  
Under DSM filters you can try to change the type. As default Sharp is enabled but you can try Smooth or Medium type as well.

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**Author:** ![Jian\_Zhang](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@Jian\_Zhang](https://community.pix4d.com/u/Jian_Zhang)\
**Post date:** [November 26, 2017, 9:29am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/6 "2017-11-26T09:29:02Z")

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Hey Selim,

**Thanks for your advice!**

**The type I used is Sharp. And I will try Smooth or Medium type again!**

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<div class="post-metadata">

**Author:** ![Selim\_Erguden](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/selim_erguden/32/337_2.png) [@Selim\_Erguden](https://community.pix4d.com/u/Selim_Erguden)\
**Post date:** [November 27, 2017, 12:14am UTC](https://community.pix4d.com/t/about-the-mosaicking-result-shadow-in-dsm-and-ghost-in-orthomosaic-image/4260/7 "2017-11-27T00:14:02Z")

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Hey Jian,  
Alternatively, you may try to downsample your resoulation instead of using the automatic settings . Are you having any other stitching issues?