# Need more images when tagging GCPs

**URL:** <https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417>\
**Category:** PIX4Dmapper\
**Created:** [October 31, 2022, 5:46pm UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417 "2022-10-31T17:46:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ndrone1](https://avatars.discourse-cdn.com/v4/letter/n/94ad74/32.png) [@ndrone1](https://community.pix4d.com/u/ndrone1)\
**Post date:** [October 31, 2022, 5:46pm UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417/1 "2022-10-31T17:46:48Z")

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While going through my GCPs and tagging them to corresponding images, I am only given between 5-8 images to use. When I view the tie points and camera positions, each GCP has at least 15 images in the immediate area that should be viable for GCP tagging. How do I access all of these images for GCP tagging?

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**Author:** ![Ryan\_Hughes](https://avatars.discourse-cdn.com/v4/letter/r/5f9b8f/32.png) [@Ryan\_Hughes](https://community.pix4d.com/u/Ryan_Hughes)\
**Post date:** [November 1, 2022, 10:37am UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417/2 "2022-11-01T10:37:08Z")

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Hello,

One way that you can access all the photos for each GCP is to open the Basic GCP/MTP Editor. To do so, click **Project** \> **GCP/MTP Manager \> Basic Editor**. This will open a new window where you will have your GCPs listed at the top and all the images at the side, listed by distance from GCP as a default setting (you can also order by Name or Distance from Marked Images). Those marked in _green_ are those that were marked in the rayCloud. From here, you select your GCP and then mark it in whichever additional photos you would like.

 ![image](https://global.discourse-cdn.com/pix4d/original/2X/d/d6414b9606d11779ab601bb3366425079d01e48a.png)

Hope that helps,  
**Dr. Ryan Hughes (He/Him)** | Technical Trainer and Content Creator

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**Author:** ![ndrone1](https://avatars.discourse-cdn.com/v4/letter/n/94ad74/32.png) [@ndrone1](https://community.pix4d.com/u/ndrone1)\
**Post date:** [November 1, 2022, 4:58pm UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417/3 "2022-11-01T16:58:18Z")

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That’s perfect - thank you Ryan!

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**Author:** ![sammenard279](https://avatars.discourse-cdn.com/v4/letter/s/b38774/32.png) [@sammenard279](https://community.pix4d.com/u/sammenard279)\
**Post date:** [April 23, 2023, 12:45am UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417/4 "2023-04-23T00:45:57Z")

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How many images should be tagged per gcp? 5 , 10, 15, 20?  
Also, how should one value an image with the gcp at the edge versus closer  
to the centre of the image? Or a gcp that is in the midst of a tree canopy but  
still is clear of branches? Thank you for any guidance.

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**Author:** ![Kapil\_Khanal](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/kapil_khanal/32/304_2.png) [@Kapil\_Khanal](https://community.pix4d.com/u/Kapil_Khanal)\
**Post date:** [April 26, 2023, 10:11pm UTC](https://community.pix4d.com/t/need-more-images-when-tagging-gcps/24417/5 "2023-04-26T22:11:24Z")

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Hello @sammenard279, I would suggest marking 8-12 good images per GCP. If you have enough GCPs, don’t mark the images which has the marker at the edge of the images and which are not clearly visible.If the marker is completely visible, then you can use it. However, it is the best practice to avoid placing the marker near the trees.