# GCP FORMAT **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [April 10, 2022, 1:24pm UTC](https://community.pix4d.com/t/gcp-format/22185 "2022-04-10T13:24:39Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![nikolaospaschalis](https://avatars.discourse-cdn.com/v4/letter/n/c2a13f/32.png) [@nikolaospaschalis](https://community.pix4d.com/u/nikolaospaschalis)\ **Post date:** [April 10, 2022, 1:24pm UTC](https://community.pix4d.com/t/gcp-format/22185/1 "2022-04-10T13:24:39Z")
Hello I extracted a GCP file from my EMLID RS2 and it is in the following format (attached) [Project 2main.zip](https://community.pix4d.com/uploads/short-url/uTqLrzHrg3Di3q64J22KM25QXz.zip) (774 Bytes) Pix4d doesn’t accept it like this. Do I need to transform it? My coordinates have to be like this (???) **4d 452911,285 4332254,121 22,660** ---
**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:** [April 11, 2022, 1:12pm UTC](https://community.pix4d.com/t/gcp-format/22185/2 "2022-04-11T13:12:36Z")
Hi @nikolaospaschalis, Thank you for your message. Here you can find additional information about the format of the Ground Control Points file: > **[Input files](https://support.pix4d.com/hc/en-us/articles/202558539-Input-files#label3)** > > PIX4Dmapper inputs are: > > > Images: PIX4mapper is based on image processing.  > > Image geolocation file (optional): The file that contains the geolocation of the images. > > Ground Control Points (GCP) fi... It should contain four or six columns per line for 3D GCPs and 3 or 5 columns per line for 2D GCPs, and use a comma to separate the columns. ---
**Author:** ![nikolaospaschalis](https://avatars.discourse-cdn.com/v4/letter/n/c2a13f/32.png) [@nikolaospaschalis](https://community.pix4d.com/u/nikolaospaschalis)\ **Post date:** [April 11, 2022, 3:25pm UTC](https://community.pix4d.com/t/gcp-format/22185/3 "2022-04-11T15:25:37Z")
thanks !!! ---
**Author:** ![nikolaospaschalis](https://avatars.discourse-cdn.com/v4/letter/n/c2a13f/32.png) [@nikolaospaschalis](https://community.pix4d.com/u/nikolaospaschalis)\ **Post date:** [April 11, 2022, 8:37pm UTC](https://community.pix4d.com/t/gcp-format/22185/4 "2022-04-11T20:37:28Z")
One more question, please … After generating a Quality report I get a yellow mark at the quality check and Georeferencing, why is that? ![Screenshot 2022-04-11 233614](https://global.discourse-cdn.com/pix4d/original/2X/2/20ec1a29c4dd7ca17446c4f03501fa81d2deb98d.jpeg) ---
**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:** [April 12, 2022, 9:40am UTC](https://community.pix4d.com/t/gcp-format/22185/5 "2022-04-12T09:40:43Z")
Hi @nikolaospaschalis The yellow warning is shown in the Quality Report when > GCPs are used and the GCP error is more than 2 times the average GSD. or > when no GCPs are used You can find more information here: > **[Quality Report Help - PIX4Dmapper](https://support.pix4d.com/hc/en-us/articles/202558689-Quality-Report-Help#label104)** > >   > > Video: Watch the instructional video related to Quality Assessment: > > > > > > >   > > Important: > > For a description of how to analyze the Quality Report: Step 4. Processing. > For a detailed description of... In your case, it seems that the GCP error is between 2 and 4 times the average Ground Sampling Distance (GSD). To resolve the problem, please read these possible causes with suggested solutions: - **Not enough GCPs** were used given the size of the project. - [Add additional GCPs](https://support.pix4d.com/hc/en-us/articles/202558699-Using-GCPs). A minimum number of 3 GCPs is required but we recommend including at least 5 to 10 GCPs. When the topography of the area is complex adding more GCPs could lead to a more accurate reconstruction. - **Accuracy values for GCPs are not properly set**. - If the accuracy of the GCPs is known then it should be entered instead of the default values in the [GCP/MTP Manager](https://support.pix4d.com/hc/en-us/articles/202557919#label7). - When using the default accuracy values in projects that are set to imperial (ft) then the [GCP accuracy](https://support.pix4d.com/hc/en-us/articles/202558329) should be adjusted to 0.066. - **Poor GCP marking:** The quality of GCP marks can be estimated by reviewing the projection error for each GCP shown in the quality report. All projection error values should be less than 1 pixel. - If the values reported are greater than 1 pixel then carefully [remark the images](https://support.pix4d.com/hc/en-us/articles/360000276046-How-to-import-and-mark-ground-control-points-GCPs-). - **GCPs are not marked on enough images.** - [Add additional GCP mark on the project images](https://support.pix4d.com/hc/en-us/articles/360000276046-How-to-import-and-mark-Ground-Control-Points-GCPs). Each GCP should be marked in at least 2 images but we recommend marking the GCPs on more project images. ---
**Author:** ![josh.abbott](https://avatars.discourse-cdn.com/v4/letter/j/90db22/32.png) [@josh.abbott](https://community.pix4d.com/u/josh.abbott)\ **Post date:** [October 31, 2023, 4:56am UTC](https://community.pix4d.com/t/gcp-format/22185/6 "2023-10-31T04:56:20Z")
Hello, further to the above. When I try and import the below 3D GCPs, the Z value does not appear in the GCP manager on Pix4D mapper. Have I got something wrong in the CSV? Thank you. 1A\_Final,288004.689666667,7600638.97933333,-11.0633333333333 1B\_Final,288042.403333333,7600580.91166667,-8.44633333333333 1C\_Final,288324.356333333,7600868.60433333,-11.5813333333333 1D\_Final,288360.499,7600836.32166667,-9.18466666666667 1E\_Final,288824.695666667,7601238.161,-10.9736666666667 1F\_Final,289521.600333333,7601734.593,-10.521 1G\_Final,289479.596666667,7601788.311,-10.4186666666667 2A\_Final,289703.787,7601941.73833333,-10.5156666666667 2B\_Final,289857.055666667,7602050.984,-10.5766666666667 2C\_Final,290581.254,7601884.82633333,-10.2823333333333 2E\_Final,291360.700333333,7601796.48333333,-10.9276666666667 2F\_Final,291365.688666667,7601774.107,-9.772 2G\_Final,291182.145,7601683.468,-10.3486666666667 2H\_Final,290323.662,7601923.03966667,-10.112 3A\_Final,292026.331666667,7601597.73733333,-10.9306666666667 3B\_Final,292896.946666667,7601173.982,-10.228 3C\_Final,292780.550333333,7600857.05733333,-3.74533333333333 3D\_Final,291370.452333333,7601715.52033333,-10.1536666666667 3E\_Final,291379.419333333,7601801.379,-11.162 3F\_Final,292324.502,7601436.164,-9.89266666666667 4A\_Final,293580.890333333,7600938.303,-9.64666666666667 4B\_Final,293767.514333333,7600827.097,-9.768 4C\_Final,294183.523333333,7600757.277,-9.75266666666666 4D\_Final,294744.497666667,7600731.61166667,-10.0986666666667 4E\_Final,293598.156333333,7601038.65366667,-11.341 5A\_Final,295380.429666667,7600596.54966667,-9.738 5B\_Final,295332.399666667,7600506.55266667,-9.995 5C\_Final,296113.934666667,7600775.527,-9.62133333333333 5D\_Final,296183.35,7600782.13266667,-9.04766666666667 6A\_Final,296754.193666667,7601046.45433333,-10.8743333333333 6B\_Final,296790.594,7600967.16733333,-9.76866666666667 6C\_Final,297389.103,7601185.49333333,-9.421 6D\_Final,297396.085,7600977.456,-7.95733333333333 7A\_Final,298149.894,7601294.21633333,-9.828 7B\_Final,298623.022,7601492.29866667,-9.11066666666667 7C\_Final,298772.511,7601410.27933333,-9.90233333333333 7D\_Final,299106.515,7601833.38766667,-8.90333333333333 7G\_Final,298605.337666667,7601443.73633333,-10.5836666666667 Deck Corner\_Final,298806.389,7601275.95433333,-9.151 ---
**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:** [October 31, 2023, 8:46am UTC](https://community.pix4d.com/t/gcp-format/22185/7 "2023-10-31T08:46:30Z")
Hi @josh.abbott, Can you please provide a screenshot of your GCP manager window? Which Coordinate Reference System did you select?