Latest Contributions by MervynLotter

Hi Will So I certainly tried signing into Pro with both the named user accounts to return the licenses but neither account work. It is easy to establish which account has the licences "booked out" by looking at the extensions and expiry date. I also confirmed that the license was taken offline by that particular account by going to AGOL and trying to return one of the extensions. AGOL then warns me that it is unable to make teh change because the license is taken offline.  I have contacted my local Tech support office but I am concerned this will just happen again. Cant think I am doing anything wrong. Mervyn ... View more

Hi Marco I was able to follow your instructions and import the point, line and polygon features into a geodatabase. Thank you. However I am unable to symbolise any of these three using any of the .lyr files that came with the ArcGIS Editor for OpenStreetMap extension. Do you know where i can download layer filesthat will work? Or better still, download any .lyrx files for the Open Street Map data? Thanks ... View more

Excellent, glad it worked. ... View more

Hi Mo I am not sure exactly what you mean by threat level but I suspect it may be something along the lines of, hypothetically: Critically Endangered (CR) = 20, Endangered (EN) = 10, Vulnerable (VU) = 5, Near Threatened = 1. If so, then I suggest you try: Running the Count Overlapping Features tool only on a group of similar threat layers, like only on the CR layers. Then do the same for each of the other threat categories.  Then add a new field to the attribute table for each outputs of the Count Overlapping Features and call this new field "score" and use Calculate Field to calculate the score for each output (Score = !Count_! * 20) (or whatever your threat weighted score is)). So at the end you will have several polygon datasets each with a "score" field that is a combination of the count of overlapping features multiplied by your threat weight. Next run a Union on these polygon features. If you dont have an advanced license you may need to run this tool several times until all your polygon layers are in one layer. An advanced license can take several files as input features at one time. Then add a new field to the output of the Union GP tool and call it "CombinedScore" Use Field Calculator to add up the respective "score" fields. (CombinedScore = !Score! + !Score_1! + !Score_2!) So in the end you should have a weighted threat score field which you can symbolise and prioritise.  Is this what you are looking for? Good luck and let me know if it worked or if you require a different process and I misunderstood your need.  I do think this process may be easier in raster.  Mervyn ... View more

Its your projection. I changed it to Web Mercator and the image then loads with the data. ... View more

Excellent, glad it worked and I also learnt something. ... View more

Hi Jim Sorry, I did not provide too many details for step 7, it was added as a bit of an afterthought. So once you have the Clip raster function (RF) set and it is working, then zoom/pan to a new area and then right click on layer in Contents pane and select Edit Raster Chain. This opens up a view similar to ModelBuilder where you can string RFs together. But we wont worry about that now. Right click on the yellow block labelled Clip, and select Properties.  Then click on the map-like Capture Current Map Extent button to update the Output Extent. You should see the extent values change.  Click OK to close the RF parameters dialogue and then click on the blue side arrow button called Apply.  The Histogram should update and you can then choose to close RF edit chain view or continue to zoom to a new area.  Good luck and let me know if you have any problems.  ... View more

Thinking more about it, if you really do require a histogram for a certain area, then I have a workaround. From the Imagery tab select the Raster Functions option.  This opens up the Raster Functions pane and search for Clip. Add your raster under "Raster" and then browse to your required extent. Then click on the rather non-descript map-like icon in bottom right which will "Capture Current Map Extent". Click on Create new Layer at bottom of pane and a virtual new raster layer will be created and added to you map and Content pane that does not take up any disk space.  Then right-click on this new raster function layer and choose Create Chart>Histogram.  Select your band number and your histogram will be created that honours the map extent used in the Clip raster function.  You can then always right-click on your new raster function layer under Content pane and Edit Function Chain. Changing the extent will automatically update the histogram but you must first click Apply after editing the extent of the Clip raster function. ... View more

Hi James Working with rasters is a different ball game and charts do generally work differently. With rasters you have a limited set of chart options and you generally first define an area of interest (so limiting the number of pixels it has to load), before you can interact with the data in a chart. But having said that, when working with rasters the histogram chart does appear to offer all of the same functionality as for vector data but the Filter by Selection is not working for me either. I tested your workflow using a Landsat image and I could not get it to work. Perhaps this is by design - I hope someone from Esri can advise us. Regarding Filter by Selection, this does work nicely but then you need a raster with an attribute table. Selection works on the attribute table and not the pixels (as with vector data), and with rasters you can use GP tools such as Select by Attributes if you have an attribute table. If needed, there is a GP tool called Build Raster Attribute Table but it only works on single band rasters. I am not sure of your required workflow but perhaps take a look at a Scatter Plot (requires that you select 2 bands). What I like a lot about it is that if you have a polygon layer in your Contents pane with your areas of interest, then if you first click on the Feature Selector under Define an area of interest, and then click on the polygon within your map view, it will only chart the pixel values for the respective polygon area.   Then regarding your comment about Range Sliders. These are only available for vector datasets and only for attributes with integer values (so no decimal values). Do take a look at Raster Functions as they offer a lot of great functionality when working with raster data. Do see Raster functions—ArcGIS Pro | Documentation  Regards Mervyn  ... View more

Hi James I have created a short 40 second video to demonstrate how Filter by Extent and Filter by Selection works using a scatter plot.  Mervyn ... View more

Just to add that rasters appear solid grey when they (or their overviews) do not have their statistics calculated, so Pro is unable to display their pixel values.  ... View more

Hi Grace That is weird, this morning your post was displaying under ArcGIS Earth but now under ArcGIS Pro. But not important. I see now that when I created the screen grab for you, I accidentally checked the wrong box. My mistake. The text is correct but not the screen-grab. Please make sure you check the Use Input Features for Clipping Geometry check-box.  One should be careful when clipping a raster and using the Maintain Clipping Extent option as it alters the geometry of the original input raster by trying to ensure that it fits exactly within the clipping polygon, so it may assign a new starting coordinate and subsequently resample the raster pixels which is never good practice when working with rasters. The resulting output will most likely be slightly less accurate than the original input raster.  Another option for you to try will be to set the extent and mask. Setting the mask is another one of the Environment settings option but available under the Analysis tab and the Geoprocessing group. Do see the below screen grab. When working with rasters I often set these two options but afterwards I try and make a point of changing it back to the defaults otherwise 6 months from now it can cause some head scratching when rerunning a different tool in the same Pro project.  ... View more