Latest Contributions by BojanŠavrič

Hi @nexusiceland, Using custom projected coordinate system and aligning it with existing definition depends on the custom definition. Does you definition also have a custom geographic coordinate system? If it does, you have to first use the Create Custom Geographic Transformation tool to define a transformation that will align your custom geographic coordinate system with existing definition. After that, you can use Project tool to convert your data to your custom definition, by selecting it as an output coordinate system. Make sure you also select an appropriate transformation path in the tool, using previously defined custom geographic transformation.  ... View more

The latest information we have is that NSRS Modernization has been delayed and "the new estimated timeline for release of the modernized NSRS (data + limited tools) is mid-2025." NGS also has a set of instructions Get Prepared, which might help your users to start getting ready for the change. They may also explore and prepare their datasets in historic NAD realizations and see how much their data lines up in the current NAD 1983 (2011) realization. This way they could identify potential discrepancies, if any, in their datasets. NCAT tool allows to transform points/data via all NAD realizations, NAD27 -> NAD83 -> NAD83(HARN) -> NAD83(FBN) -> NAD83(NSRS2007) -> NAD83(2011).  The same data conversions through the realizations can be done in multiple steps with NADCON5 transformations in ArcGIS. Those transformations become active once the ArcGIS Coordinate Systems Data is installed with the core software. I hope this helps. ... View more

@N_W_S_E  To see the difference between the two transformations you mentioned, you can select one and then click details (green link below selected transformation path): This will open you a transformation details window with all the transformation info including the areas of use and accuracy. As you can see in the details above, both transformations should be used to transform USA data.  For suggestions and advice, I will let @MelitaKennedy to reply.   ... View more

Please note that we added support for vertical transformations between CGVD28 and CGVD2013 in ArcGIS Pro 2.9. You will need to install supplementary coordinate system files, which include CGG2013 and CGG2013a geoid models and other conversion grid files. This allows you to convert heights between NAD83CSRS and CGVD2013. I hope this helps, Bojan ... View more

Please note that we added support for vertical transformations between CGVD28 and CGVD2013 in ArcGIS Pro 2.9. You will need to install supplementary coordinate system files, which include CGG2013 and CGG2013a geoid models and other conversion grid files. 3D and raster data can be converted with Project and Project Raster tools. I hope this helps, Bojan ... View more

Please note that we added support for vertical transformations between CGVD28 and CGVD2013 in ArcGIS Pro 2.9. You will need to install supplementary coordinate system files, which include CGG2013 and CGG2013a geoid models and other conversion grid files.  I hope this helps, Bojan ... View more

@GIScs Yes, we do support conversion of heights between CGVD28 and CGVD 2013 and CGVD 2013 (CGG2013a). You can use Project tool with Vertical option turned on, or you can do it on-the-fly in ArcGIS Pro. Please note, you will need to install supplementary coordinate system files, which include CGG2013 and CGG2013a geoid models and other conversion grid files.  I hope this helps, Bojan ... View more

Hello @GrantHopkins1, I can imagine how difficult it is to know all little details about transformations and coordinate systems. Every country does this things a bit differently, which does not help GIS users. All that knowledge comes with experience and, with time, it gets easier. In cases when there is no transformation to desired GCS listed in the Geographic and Vertical Transformation Tables, I would suggest you reach out to your local Esri's distributor. I expect they would know any specifics for the country and have contacts to the local agencies. They can work with the agencies to obtain necessary information about possible transformations and clear any license restrictions. Once they obtain the information, they can contact us with details and we implement transformations. For the Ontario province, we do have definitions for transformations to NAD83 (CSRS) v3, WKID::8240, provided by NRCAN (I know this is not what your are looking for but it might help.): Due to license restrictions at the time we added these definitions into ArcGIS, we do not distribute the necessary NTv2 files with the ArcGIS Coordinate Systems Data software component. If you wish to try them out, you can download them from the NRCAN website or from here and add them to a specific CoordinateSystemsData\pedata subfolder on your machine. Files are sorted into folders by transformation method name, such as NTv2 or vertical\geoid. For these four transformations, you should add the NTv2 files to <System Drive>\Program Files (x86)\ArcGIS\CoordinateSystemsData\pedata\ntv2 folder. Please contact your local distributor if you have any troubles or need more detailed instructions.  To comment on @MattCriel's suggestion above. ArcGIS Pro is limited to 2-step transformation paths when projecting data on-the-fly. Unfortunately, this results in transformation paths that might not be geodetically correct (aka transforming between Canadian GCS-es via world-wide WGS 1984 GCS). This happens often when country has several GCS-es in use and one needs to transform/project data in several steps via multiple GCS realizations. For some applications, transforming data via WGS 1984 works OK, but I would not recommend it in general. I hope this helps, Bojan ... View more

@MatthewCriel Thank you for submitting your idea.  I believe ArcGIS Pro already supports several transformations between NAD 1983 (CSRS) and WGS 1984 geographic coordinate systems. If I set the map to NAD 1983 CSRS UTM Zone 16N (WKID::3160), I get the following possible transformation paths: In which coordinate system is your Canadian CSRS data? If it is using one of the NAD 1983 (CSRS) realizations (e.g. NAD83 (CSRS) v6, WKID::9644), we do not have any defined because none of the are registered with EPSG nor we can find them on Natural Resources Canada's website.   ... View more

Hi @CarlinAndrus: This may not be the exact point of this thread, but one way to address this issue is also correcting geographic coordinate system (GCS) definition in which your dataset is defined, GCS_NAD83_1986.  Original NAD 1983 GCS has many aliases that are used across the GIS community. One of them is probably also GCS_NAD83_1986, which is not in our database of synonyms. Therefore, software is treating this definition as a custom GCS, which does not have any predefined transformation to other GCS in the list of predefined GCS-es. The result is a missing transformation path and the warning. One way to fix this is to use Define Projection tool and correct GCS definition of your dataset to NAD 1983. This will resolve the conflict and transformation will no longer be required in your case. You can do this once on the dataset and it will fix it for every map in the project if that map is using "fixed" dataset. In case you cannot change GCS definition or you wish to keep it, you can also create a custom transformation between GCS_NAD83_1986 and NAD 1983. You can do this with Create Custom Geographic Transformation tool and providing appropriate transformation between your custom GCS of your data and GCS of your map. I hope this helps... ... View more