# GCP conversion issue **URL:** \ **Category:** PIX4Dmatic Questions/Troubleshooting\ **Created:** [June 25, 2021, 4:03am UTC](https://community.pix4d.com/t/gcp-conversion-issue/18697 "2021-06-25T04:03:17Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![uavis](https://avatars.discourse-cdn.com/v4/letter/u/ed655f/32.png) [@uavis](https://community.pix4d.com/u/uavis)\ **Post date:** [June 25, 2021, 4:03am UTC](https://community.pix4d.com/t/gcp-conversion-issue/18697/1 "2021-06-25T04:03:17Z")
Hi, I have been trying to export a project in both mapper and matic. I can get the outputs needed in mapper with the GCPs i have but i cannot import that GCP file into PIx4dmatic. It either says Parse error line 1 column 4 or if i bypass that by importing a txt file then the screen goes black and i cant see the photos that i have uploaded until i have deleted all the gcps [GCP & MTP.txt](https://community.pix4d.com/uploads/short-url/lw7zcUZBFIWnTHgbJpHUhbQbjik.txt) (717 Bytes) I have uploaded the GCP txt file. PIX4d Matic is saying that the co-ordinate system is WGS84 UTM 55S. The GCP co-ordinate system should be wgs 84 - height above ellipsoid. I had to import a prj file into pix4d mapper to get it to work properly there ---
**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\ **Post date:** [June 25, 2021, 7:08am UTC](https://community.pix4d.com/t/gcp-conversion-issue/18697/2 "2021-06-25T07:08:42Z")
Hi, Thank you for your message. I replied in the direct support ticket. The GCP format seems to be correct: > **[Tie points (GCPs, CPs) import format - PIX4Dmatic](https://support.pix4d.com/hc/en-us/articles/360038397752-Tie-points-GCPs-CPs-import-format)** > > The file format to import tie points (Ground Control Point, Checkpoints) is a .csv or .txt file. It contains four or six columns per line and uses commas "," as column separators. The formats of ti... cheers