Latest Contributions by MervynLotter

You will have to open up your polygon layer to check whether it has a unique identifier, whether it be a grid name, farm or reserve name, etc. The way I understand it, you want a species list with abundances (counts) for each polygon (or one polygon in your case), so each polygon requires a unique name. From the table you provided, I can not easily see if you in fact do have a unique name or number. If not, add a unique name to your polygon then summarize as in my second post. ... View more

Sorry, one small change in my suggestion, you will need to run the Summary Statistics tool.  Statistics Field is species name with stats type as count. The case field will be both your species and polygon name/number fields. ... View more

You are almost there. Do a join from species to polygon so that you have 35k records, then just open attribute table and the the Summarize tool on the unique polygon number/name. In the option to choose one or more summary stats to be included, make sure you select your unique bird name. It will list the relevant species and provide a count. Mike Miller also created a similar online tool to do this, with added diversity indices. Do see Diversity Calculator - Geospatial Brainstorming  ... View more

This is happening to a colleague of mine. The workaround is to use Windows Explorer to browse to file and then double click to open. We don't know why this is happening. ... View more

Hi Greg I experienced what your results are showing. The important step is obtaining the correct elevation for the point where your drone flew from, and creating the raster with a fixed altitude. I used the Manage GCP functionality get the correct altitude using the *add ground control points from map functionality*, to get the correct altitude. I then created a large polygon covering the area I surveyed and added the flight to the attribute field. Then I create the raster from that (polygon to raster tool). If your results are failing, try adding your raster to a Local Scene and set the layer properties to an absolute height. I haven't tried this, but it should show you if there is an error with your raster elevation. Good luck. Cheers Mervyn ... View more

The various outputs should be aligned, I dont know why they are not. I tried a different data-set this evening and I can replicate your error.  I think the AREA field (and Shape_Area field if you summarize it) may be wrong and I have no idea why. Same projection, no overlapping polygons, ran repair geometry, etc.  I dont have more time to spend on this now. Perhaps use the Summarize Within tool for the time being, as Drew Flater suggested.   ... View more

Hi David This was an incredibly useful post, thank you. I have a DJI drone and I have been struggling with creating a 3D products from Drone2Map that are vertically aligned with the surrounding landscape. I have tried adding GCP points but that usually results in a very skewed final product. This ultimately results in me not wanting to share my Drone2Map products with others until such time as I sort out the altitude problem. Your workflow has solved that.  To simplify your workflow, I have created a new idea for Drone2Map on the ArcGIS Ideas site. Do see https://community.esri.com/ideas/15040  Thanks so much. Regards Mervyn ... View more

Hi Thomas Thanks for the feedback. So this is then not happening on your side then I gather. I dont think this BUG applies as I am not using any custom templates, just creating a new project from Pro's default project templates. The map.gdb geodatabases are also empty where those in the bug report contain data. Just did a bit more testing. If you create a new project from a blank project template, then you only get one new geodatabase with same name as project. If you create a new project with a map then you get a geodatabase with project name and a map.gdb If you create a new project with a Global_Scene, then you get a geodatabase with same name as project and a Global_Scene.gdb If you create a new project with a Local-Scene, then you get a geodatabse with same name as project and a Local_Scene.gdb. I just dont see any data in these second gdbs so was wondering what their purpose would be. Thanks ... View more

Hmm, I would go for Tabulate Intersection as data does not need to be rasterised. It is also the only tool where you can set an output tolerance.  I suspect the discrepancies you have seen may be related to the calculation of area on a planar surface versus a geodesic surface. However I suspect the tools would all be using a planar surface. Something to look into using the Calculate Geometry tool to compare with various outputs.  I also noticed that I meant to write that the output cell size for the Tabulate Areas tool was set to 50 m not 50 ha.  ... View more

I was under the impression that the Tabulate Area tool was for use with raster data but I now see it can do both.  I took a closer a look and when working with vector data, both the Tabulate Area and Summarise Within tools rasterize the data and a cell size needs to be set for Tabulate Areas.  I checked these three tools against my own data and the difference was minor, around 0.007%. Tabulate Areas was less similar than the other two but I suspect if I had to decrease cell size, it would match up. I then checked these three tools on the dataset you provided on Mangroves in central Mozambique and again the results were consistent.  For example: Tabulate Intersection: 85 376 ha of mangroves Tabulate Areas (50 ha cell size given fragmented extent of mangroves): 85 333 ha (I converted to ha) Summarise Within: 85 376 ha Therefore results from Tabulate Intersection and Summarise Within are identical and Tabulate Areas only 0.05% off.  Perhaps try again in a new view?  ... View more

Are you referring to the Tabulate Intersection GP tool  when you mentioned "Tabulate area"? I use the Tabulate Intersection—Help | ArcGIS Desktop  for these kinds of analyses and it lets you specify the output units. Unfortunately this tool does require a ArcGIS Desktop Advanced licence. ... View more

You can also add single coordinates in the Locate tool, using a comma to separate coordinates. ... View more

Thank you Tina. I think I now understand what has happened.  If you read this thread (Will the next release of ArcGIS Explorer for Android be able to show Beta release of ArcGIS Pro 2.1 ), it ends with a statement from Mark Bockenhauer where he indicated that the inclusion of rasters in MMPKs would not affect licencing levels (and MMPKs are viewable with a Lite licence). This is why I did not think our problem was related to licencing levels, which is contrary to what you have written and clarified for us.  This is unfortunate and my work with rasters in MMPKs will now have to be with Tiles.  Best wishes Mervyn ... View more