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Please help this newbie with her offset data!

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06-30-2020 07:18 AM
JaimeFrye
New Contributor II

Hi there - I am a fairly novice ESRI user using arccollector. The data I'm uploading and the map I'm loading to has the same Spatial Reference. 

However, when the data gets loaded in to the computer everything is about 5' off in the same cardinal direction from my basemap ortho. My colleague said he used to have the same problem but did something super simple to fix it. Unfortunately he can't remember what that was.

I'm so tired of gnashing my teeth over this. Any help would be appreciated!

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4 Replies
JaimeFrye
New Contributor II

One more bit - everything looks correct on arc collector. What is going wrong from tablet to computer?

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LukasFalk
Esri Contributor

Hello Jaime!  

When you say your bringing the data onto your computer what exactly are you viewing the data in?  ArcMap, ArcGIS Pro, ArcGIS Online?  If you are viewing the data in ArcGIS Online the default map projection is Web Mercator so if that doesn't match with the coordinate system specified initially this may cause issues.  

Also I assume you are using a tablet to record the data rather than an external GPS receiver, is this correct?  

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JaimeFrye
New Contributor II

Hey there! Thank you for reaching out.

Everything gets synced in ArcGIS online and then I pull it into ArcGISPro. My maps and layers are all in WGS 1984. 

I use a Geode GNSS reciever that connects via bluetooth to my samsung tablet that I run ArcCollector on. 

The data from today actually didn't look too bad (just accuracy issues because of canopy/cloud cover) but It happens enough that I'd like to understand why. 

Also, to give you a little additional reference, I do all of this mapping on a historic property that we have excellent orthoimagery on. I can tell when a point that I mapped as a sundial isn't actually over the sundial, fountain, etc. and when I notice the issue, all of the points are skewed by the same distance and cardinal direction so I don't think it's a receiver accuracy issue. I've tried googling but have never found a clear path to a solution. 

I'm sure it's just something stupid and extremely obvious that I've overlooked!

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lForensicWick
New Contributor

@JaimeFrye wrote:

Hi there - I am a fairly novice ESRI user using arccollector. The data I'm uploading and the map I'm loading to has the same Spatial Reference. 

However, when the data gets loaded in to the computer everything is about 5' off in the same cardinal direction from my basemap ortho. My colleague said he used to have the same problem but did something super simple to fix it. Unfortunately he can't remember what that was.

I'm so tired of gnashing my teeth over this. Any help would be appreciated!


It sounds like your data may be in the wrong coordinate system, or your basemap may be in the wrong coordinate system. A small difference in the coordinate system can cause the data to be misaligned by a few feet.

Here are a few things you can try to fix the issue:

  1. Check the coordinate system of your data and your basemap. Make sure they are the same. You can do this by opening the layer properties for each layer in ArcGIS Pro or ArcMap.

  2. If the coordinate systems are different, you can try to reproject your data to match the coordinate system of your basemap. This can be done using the "Project" tool in ArcGIS Pro or ArcMap.

  3. If your data is still not aligned after checking the coordinate systems, you may need to adjust the transformation settings when reprojecting. This can be done in the "Project" tool by selecting the appropriate transformation method for your data.

  4. Another potential issue could be the use of a different vertical coordinate system. If your data includes elevation data, you may need to check the vertical coordinate system of your data and ensure it matches the vertical coordinate system of your basemap.

If none of these solutions work, you may need to consult with a GIS specialist to help diagnose the issue. and do not worry about your teeth we got you.

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