# No Tie Points Between Adjacent Calibrated Images

**URL:** <https://community.pix4d.com/t/no-tie-points-between-adjacent-calibrated-images/26151>\
**Category:** PIX4Dmapper\
**Created:** [April 19, 2023, 7:24pm UTC](https://community.pix4d.com/t/no-tie-points-between-adjacent-calibrated-images/26151 "2023-04-19T19:24:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![David\_Boland](https://avatars.discourse-cdn.com/v4/letter/d/53a042/32.png) [@David\_Boland](https://community.pix4d.com/u/David_Boland)\
**Post date:** [April 19, 2023, 7:24pm UTC](https://community.pix4d.com/t/no-tie-points-between-adjacent-calibrated-images/26151/1 "2023-04-19T19:24:06Z")

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Hello,  
I am trying to understand what is causing the lack of tie points between adjacent, calibrated images. I’ve processed 1,000s of jobs and have never seen anything like what’s depicted in the attached image. The fingers highlighted in red DO NOT coincide with waterways, unique topography, vegetation or homogeneity. The point cloud looks fantastic with no indication of what’s depicted in the attached image.

The images are from a Sony RX1 with 70% horizontal overlap. The average GSD is 1.74 CM. The images are all PPK with Omega, Phi and Kappa values.

Please help me understand what is causing this anomaly and how I can correct it in this data set or avoid it in future data sets.

Thank you,

David

 ![matches_graph_XY](https://global.discourse-cdn.com/pix4d/original/2X/4/46d33325396edfbf201404405440bd2343c936ca.png)

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**Author:** ![Rosana\_Lin](https://avatars.discourse-cdn.com/v4/letter/r/71e660/32.png) [@Rosana\_Lin](https://community.pix4d.com/u/Rosana_Lin)\
**Post date:** [April 24, 2023, 2:16am UTC](https://community.pix4d.com/t/no-tie-points-between-adjacent-calibrated-images/26151/2 "2023-04-24T02:16:53Z")

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Hi David,

I hope you are doing well. I responded to your support ticket about this issue.

If you still have any questions about this project, feel free to respond to the support ticket!

For everyone’s visibility, the areas circled in red represent weak keypoint matches. You can look into the image content to see if the areas are very homogenous (for example, water bodies, snowy areas, sandy areas, dense vegetation, etc.).

Some solutions you can try in general include:

- Increase the overlap of the homogenous area to more than 75%. For more info on recommended overlap based on an area of interest:  
[Step 1. Before Starting a Project \> 1. Designing the Image Acquisition Plan \> a. Selecting the Image Acquisition Plan Type - PIX4Dmapper](https://support.pix4d.com/hc/en-us/articles/202557459-Step-1-Before-Starting-a-Project-1-Designing-the-Image-Acquisition-Plan-a-Selecting-the-Image-Acquisition-Plan-Type-PIX4Dmapper?source=search)  
[How to verify that there is enough overlap between the images - PIX4Dmapper](https://support.pix4d.com/hc/en-us/articles/203756125-How-to-verify-that-there-is-enough-overlap-between-the-images-PIX4Dmapper?source=search)
- Try a higher image scale (if noise is not an issue yet). For more info on image scale: [Menu Process \> Processing Options… \> 1. Initial Processing \> General](https://support.pix4d.com/hc/en-us/articles/202557759-Menu-Process-Processing-Options-1-Initial-Processing-General?source=search)
- Add MTPs in those areas. For step-by-step instruction with a tutorial video: [How to add / import and mark manual tie points (MTPs) in the rayCloud](https://support.pix4d.com/hc/en-us/articles/202560349-How-to-add-import-and-mark-manual-tie-points-MTPs-in-the-rayCloud?source=search)
- Use Rematch and Reoptimize. For more info: [Menu Process \> Rematch and Optimize](https://support.pix4d.com/hc/en-us/articles/202558309-Menu-Process-Rematch-and-Optimize?source=search)

A friendly reminder to everyone that, at the same time, there are many variables involved when a technical issue occurs. Just keep in mind that if you have tried the above-mentioned solutions and have yet to help, it is still case-dependent for different projects. I suggest looking through our [documentation](https://support.pix4d.com/hc/en-us/categories/360001503192-PIX4Dmapper) and [tutorial videos](https://www.youtube.com/playlist?list=PL8ZbncaV3f_anQs_DoyKUxmNDApxM0HT8), first. If they do not help much and you have a valid license with valid Support and Upgrades service, feel free to [send us a technical support ticket](https://support.pix4d.com/hc/en-us/requests/new?)! We are happy to help!

Best,  
Rosana (she/her)