Latest Contributions by MervynLotter

From my somewhat limited understanding of this .... and I welcome to be corrected here If you have defined a vertical coordinate system, then you may get up to 3 spatial references listed here. The top one is the projection of your data. The second one describes the modelled shape of the earth - your datum/ellipsoid/spheroid (also referred to as  geographic coordinate system by Esri). And if you have a third one, it would be the vertical coordinate system.  From your screengrab, you will notice that the two spatial references are different as only the second one refers to the datum and spheroid. If your data is not projected, and it is in geographic coordinates, then only one spatial reference will be provided to you (the second geographic coordinate system in your screengrab with spheroid and ellipsoid).   Do see Coordinate systems, projections, and transformations—Properties of maps | ArcGIS Desktop  ... View more

Hi Scott Thanks for writing. I respond below to your questions. 1.  Destination 2. Yes, the layer files references the landuse FC but the layer file is not directly part of the relationship. In ArcMap, I think all the landuse referenced layer files would have opened, not just the one in the relate.  3.  One to many 4. I open the table to which I have added the relate, I then select a record, then I go to Data>Related Data, select my relate, and the related records are not shown. As soon as I remove the lyrx file, and I repeat this process, then the relate shows me the correct attributes from the landuse layer. 5. No 6. I can go one better and provide the data set to you. Dropbox - RelateBug.rar  Firstly, load the Landuse layer and Landuse_Statistics table from the geodatabase. Open up the Landuse_Statistics table and create a relate to Landuse using the Land_use field in both. Select any field from Landuse_statistics and confirm that relate works. Then add the Excluded Lands.lyrx (set the data source to Landuse) file and repeat this process, the relate wont work.  Thanks for looking into this. Mervyn ... View more

What is the source of your GCPs? Offhand I cant think of any reasons why your drone images are placed at different heights. Did you perhaps try adjusting the image properties? Image Properties > Image Options >  Adjust Image Altitudes.  It would be useful to know whether the altitude values for each image also show this abrupt change in altitude? This would be easy to see from the image properties pane as in below image. Therefore pointing to whether the problem lies with the recorded altitude metadata values or the Drone2Map/GCP processes.  What makes you think that the two elevation surfaces are not showing up? They are invisible as they are only used to adjust the height of the 2D layer pixels but you can see them if you turn on Shade Relative To Light Position on the Elevation Surface Appearance tab. Or you could try draping over any other raster surface.  Your situation is certainly unusual and I don't think I have any answers but it will be useful to better understand what is going on.  ... View more

Hi Diana Do you know what software created the shapefile?  I can view the geoprocessing history of some of my shapefiles but not all of my shapefiles contain that history. It may be more limited than geodatabase feature classes. Regards Mervyn ... View more

Hi Diana There is metadata and metadata. Every feature class has its own metadata which ArcGIS keeps track of.  In what format is your data? A feature class, shapefile, AGOL feature layer? Metadata more limited for shapefiles.  If your data in a feature class, and you change your metadata type under Options to anything else other than the default Item Description, you should see a section called Geoprocessing history which keeps track of all the geoprocessing tools run on your feature class.  Below is an example of the geoprocessing history that Pro keeps track of.  ... View more

If you are only interested in converting a raster to a format that can be downloaded onto Collector then try creating a tile package (TPK) and side-loading that onto the device. Rasters are not support in vector tile packages. For more detail, do see Go offline—Collector for ArcGIS (Classic) | ArcGIS  and https://community.esri.com/thread/90177  If I am not editing data, then I usually create a TPK of the raster data, then include that in a MMPK with my vector data (with pop-ups and bookmarks) that is easily side-loaded onto Explorer for ArcGIS.  ... View more

You can also use the Topographical Positional Index (TPI) to determine position along a slope. If you are using ArcMap, then there is a really useful add-on that was developed by Jenness Enterprises that will easily calculate and categorise this for you. The add-on is free and part of the Land Facet Corridor designer tool. See Jenness Enterprises - ArcGIS Tools; Land Facet Corridor Designer  The Slope Position 3-category output may give you what you are looking for.  The documentation is really good and will help with the installation and setting some of the parameters.  If you are using ArcGIS Pro, then you can more-or-less accomplish the same thing using Focal Statistics and Raster Calculator, you will just need to categorise the output yourself afterwards.  ... View more

Hi Dan No. I was actually thinking in terms of the geoprocessing history as recorded in the Catalog pane history tab. See my screen-grab. All processing recorded here. And as an example of the geoprocessing  history recorded in the metadata. ... View more

Perhaps it would be a good idea to check your geoprocessing history to see whether the edits were logged, and if so, to the same feature class you expected? Edits are also recorded in the file metadata. You may want to check these in Catalog view. ... View more

Hi Jason You are correct, I meant that it records an average for 30 locations instead of seconds.  I do not recall what I set the streaming interval to (probably the default value) or the location accuracy to (I suspect I had set this to 4-5 meters) as I am now testing the new Aurora Collector app but which has not yet implemented the GPS averaging functionality in the current beta version. I noticed it is implemented for the iOS platform.  The Extract Values to Points requires the Spatial Analyst extension. Under the Extraction toolset. Good luck ... View more

Hi Kenta I see what you mean regarding the problem with the output from the Point to Line feature class.  I replicated this issue using my own GPX file. The workaround would be to work with the point feature class that was an output from the GPX conversion tool.  There is a nifty tool called Collect Events that will take your point feature class as an input and provide an output of point features with a count of the number of times that points overlapped. But the point geometry has to be identical for them to be counted as such. Try this and check the results, but you may first want to run another tool before this one where you can specify that all points within, for example, 20 meters are considered to be the spatially identical and then these points are snapped to one another. This is the Integrate tool but be very careful to work on a copy of your original feature class as this tool changes the geometry of your existing points.  ... View more

I had another look at editing my data with unique symbology applied and I cant replicate the problem you describe, although I am using Pro 2.3 Beta. ... View more